tmpfs_vnops.c revision 230180
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 230180 2012-01-16 00:26:49Z 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, rv; 441 442 VM_OBJECT_LOCK(tobj); 443 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 444 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 445 if (m->valid != VM_PAGE_BITS_ALL) { 446 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 447 rv = vm_pager_get_pages(tobj, &m, 1, 0); 448 if (rv != VM_PAGER_OK) { 449 vm_page_lock(m); 450 vm_page_free(m); 451 vm_page_unlock(m); 452 VM_OBJECT_UNLOCK(tobj); 453 return (EIO); 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 vm_page_lock(m); 462 vm_page_unwire(m, TRUE); 463 vm_page_unlock(m); 464 vm_page_wakeup(m); 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, rv; 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 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 668 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 669 if (tpg->valid != VM_PAGE_BITS_ALL) { 670 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 671 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 672 if (rv != VM_PAGER_OK) { 673 vm_page_lock(tpg); 674 vm_page_free(tpg); 675 vm_page_unlock(tpg); 676 error = EIO; 677 goto out; 678 } 679 } else 680 vm_page_zero_invalid(tpg, TRUE); 681 } 682 VM_OBJECT_UNLOCK(tobj); 683 if (vpg == NULL) 684 error = uiomove_fromphys(&tpg, offset, tlen, uio); 685 else { 686 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 687 pmap_copy_page(vpg, tpg); 688 } 689 VM_OBJECT_LOCK(tobj); 690 if (error == 0) { 691 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 692 ("parts of tpg invalid")); 693 vm_page_dirty(tpg); 694 } 695 vm_page_lock(tpg); 696 vm_page_unwire(tpg, TRUE); 697 vm_page_unlock(tpg); 698 vm_page_wakeup(tpg); 699out: 700 VM_OBJECT_UNLOCK(tobj); 701 if (vpg != NULL) { 702 VM_OBJECT_LOCK(vobj); 703 vm_page_wakeup(vpg); 704 VM_OBJECT_UNLOCK(vobj); 705 } 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 FALSE); 752 if (error != 0) 753 goto out; 754 } 755 756 uobj = node->tn_reg.tn_aobj; 757 while ((resid = uio->uio_resid) > 0) { 758 if (node->tn_size <= uio->uio_offset) 759 break; 760 len = MIN(node->tn_size - uio->uio_offset, resid); 761 if (len == 0) 762 break; 763 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 764 if ((error != 0) || (resid == uio->uio_resid)) 765 break; 766 } 767 768 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 769 (extended ? TMPFS_NODE_CHANGED : 0); 770 771 if (node->tn_mode & (S_ISUID | S_ISGID)) { 772 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 773 node->tn_mode &= ~(S_ISUID | S_ISGID); 774 } 775 776 if (error != 0) 777 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 778 779out: 780 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 781 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 782 783 return error; 784} 785 786/* --------------------------------------------------------------------- */ 787 788static int 789tmpfs_fsync(struct vop_fsync_args *v) 790{ 791 struct vnode *vp = v->a_vp; 792 793 MPASS(VOP_ISLOCKED(vp)); 794 795 tmpfs_update(vp); 796 797 return 0; 798} 799 800/* --------------------------------------------------------------------- */ 801 802static int 803tmpfs_remove(struct vop_remove_args *v) 804{ 805 struct vnode *dvp = v->a_dvp; 806 struct vnode *vp = v->a_vp; 807 808 int error; 809 struct tmpfs_dirent *de; 810 struct tmpfs_mount *tmp; 811 struct tmpfs_node *dnode; 812 struct tmpfs_node *node; 813 814 MPASS(VOP_ISLOCKED(dvp)); 815 MPASS(VOP_ISLOCKED(vp)); 816 817 if (vp->v_type == VDIR) { 818 error = EISDIR; 819 goto out; 820 } 821 822 dnode = VP_TO_TMPFS_DIR(dvp); 823 node = VP_TO_TMPFS_NODE(vp); 824 tmp = VFS_TO_TMPFS(vp->v_mount); 825 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 826 MPASS(de != NULL); 827 828 /* Files marked as immutable or append-only cannot be deleted. */ 829 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 830 (dnode->tn_flags & APPEND)) { 831 error = EPERM; 832 goto out; 833 } 834 835 /* Remove the entry from the directory; as it is a file, we do not 836 * have to change the number of hard links of the directory. */ 837 tmpfs_dir_detach(dvp, de); 838 if (v->a_cnp->cn_flags & DOWHITEOUT) 839 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 840 841 /* Free the directory entry we just deleted. Note that the node 842 * referred by it will not be removed until the vnode is really 843 * reclaimed. */ 844 tmpfs_free_dirent(tmp, de, TRUE); 845 846 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 847 error = 0; 848 849out: 850 851 return error; 852} 853 854/* --------------------------------------------------------------------- */ 855 856static int 857tmpfs_link(struct vop_link_args *v) 858{ 859 struct vnode *dvp = v->a_tdvp; 860 struct vnode *vp = v->a_vp; 861 struct componentname *cnp = v->a_cnp; 862 863 int error; 864 struct tmpfs_dirent *de; 865 struct tmpfs_node *node; 866 867 MPASS(VOP_ISLOCKED(dvp)); 868 MPASS(cnp->cn_flags & HASBUF); 869 MPASS(dvp != vp); /* XXX When can this be false? */ 870 871 node = VP_TO_TMPFS_NODE(vp); 872 873 /* XXX: Why aren't the following two tests done by the caller? */ 874 875 /* Hard links of directories are forbidden. */ 876 if (vp->v_type == VDIR) { 877 error = EPERM; 878 goto out; 879 } 880 881 /* Cannot create cross-device links. */ 882 if (dvp->v_mount != vp->v_mount) { 883 error = EXDEV; 884 goto out; 885 } 886 887 /* Ensure that we do not overflow the maximum number of links imposed 888 * by the system. */ 889 MPASS(node->tn_links <= LINK_MAX); 890 if (node->tn_links == LINK_MAX) { 891 error = EMLINK; 892 goto out; 893 } 894 895 /* We cannot create links of files marked immutable or append-only. */ 896 if (node->tn_flags & (IMMUTABLE | APPEND)) { 897 error = EPERM; 898 goto out; 899 } 900 901 /* Allocate a new directory entry to represent the node. */ 902 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 903 cnp->cn_nameptr, cnp->cn_namelen, &de); 904 if (error != 0) 905 goto out; 906 907 /* Insert the new directory entry into the appropriate directory. */ 908 if (cnp->cn_flags & ISWHITEOUT) 909 tmpfs_dir_whiteout_remove(dvp, cnp); 910 tmpfs_dir_attach(dvp, de); 911 912 /* vp link count has changed, so update node times. */ 913 node->tn_status |= TMPFS_NODE_CHANGED; 914 tmpfs_update(vp); 915 916 error = 0; 917 918out: 919 return error; 920} 921 922/* --------------------------------------------------------------------- */ 923 924static int 925tmpfs_rename(struct vop_rename_args *v) 926{ 927 struct vnode *fdvp = v->a_fdvp; 928 struct vnode *fvp = v->a_fvp; 929 struct componentname *fcnp = v->a_fcnp; 930 struct vnode *tdvp = v->a_tdvp; 931 struct vnode *tvp = v->a_tvp; 932 struct componentname *tcnp = v->a_tcnp; 933 934 char *newname; 935 int error; 936 struct tmpfs_dirent *de; 937 struct tmpfs_mount *tmp; 938 struct tmpfs_node *fdnode; 939 struct tmpfs_node *fnode; 940 struct tmpfs_node *tnode; 941 struct tmpfs_node *tdnode; 942 943 MPASS(VOP_ISLOCKED(tdvp)); 944 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 945 MPASS(fcnp->cn_flags & HASBUF); 946 MPASS(tcnp->cn_flags & HASBUF); 947 948 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 949 950 /* Disallow cross-device renames. 951 * XXX Why isn't this done by the caller? */ 952 if (fvp->v_mount != tdvp->v_mount || 953 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 954 error = EXDEV; 955 goto out; 956 } 957 958 tmp = VFS_TO_TMPFS(tdvp->v_mount); 959 tdnode = VP_TO_TMPFS_DIR(tdvp); 960 961 /* If source and target are the same file, there is nothing to do. */ 962 if (fvp == tvp) { 963 error = 0; 964 goto out; 965 } 966 967 /* If we need to move the directory between entries, lock the 968 * source so that we can safely operate on it. */ 969 if (fdvp != tdvp && fdvp != tvp) 970 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 971 fdnode = VP_TO_TMPFS_DIR(fdvp); 972 fnode = VP_TO_TMPFS_NODE(fvp); 973 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 974 975 /* Entry can disappear before we lock fdvp, 976 * also avoid manipulating '.' and '..' entries. */ 977 if (de == NULL) { 978 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 979 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 980 error = EINVAL; 981 else 982 error = ENOENT; 983 goto out_locked; 984 } 985 MPASS(de->td_node == fnode); 986 987 /* If re-naming a directory to another preexisting directory 988 * ensure that the target directory is empty so that its 989 * removal causes no side effects. 990 * Kern_rename gurantees the destination to be a directory 991 * if the source is one. */ 992 if (tvp != NULL) { 993 MPASS(tnode != NULL); 994 995 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 996 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 997 error = EPERM; 998 goto out_locked; 999 } 1000 1001 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1002 if (tnode->tn_size > 0) { 1003 error = ENOTEMPTY; 1004 goto out_locked; 1005 } 1006 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1007 error = ENOTDIR; 1008 goto out_locked; 1009 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1010 error = EISDIR; 1011 goto out_locked; 1012 } else { 1013 MPASS(fnode->tn_type != VDIR && 1014 tnode->tn_type != VDIR); 1015 } 1016 } 1017 1018 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1019 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1020 error = EPERM; 1021 goto out_locked; 1022 } 1023 1024 /* Ensure that we have enough memory to hold the new name, if it 1025 * has to be changed. */ 1026 if (fcnp->cn_namelen != tcnp->cn_namelen || 1027 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1028 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1029 } else 1030 newname = NULL; 1031 1032 /* If the node is being moved to another directory, we have to do 1033 * the move. */ 1034 if (fdnode != tdnode) { 1035 /* In case we are moving a directory, we have to adjust its 1036 * parent to point to the new parent. */ 1037 if (de->td_node->tn_type == VDIR) { 1038 struct tmpfs_node *n; 1039 1040 /* Ensure the target directory is not a child of the 1041 * directory being moved. Otherwise, we'd end up 1042 * with stale nodes. */ 1043 n = tdnode; 1044 /* TMPFS_LOCK garanties that no nodes are freed while 1045 * traversing the list. Nodes can only be marked as 1046 * removed: tn_parent == NULL. */ 1047 TMPFS_LOCK(tmp); 1048 TMPFS_NODE_LOCK(n); 1049 while (n != n->tn_dir.tn_parent) { 1050 struct tmpfs_node *parent; 1051 1052 if (n == fnode) { 1053 TMPFS_NODE_UNLOCK(n); 1054 TMPFS_UNLOCK(tmp); 1055 error = EINVAL; 1056 if (newname != NULL) 1057 free(newname, M_TMPFSNAME); 1058 goto out_locked; 1059 } 1060 parent = n->tn_dir.tn_parent; 1061 TMPFS_NODE_UNLOCK(n); 1062 if (parent == NULL) { 1063 n = NULL; 1064 break; 1065 } 1066 TMPFS_NODE_LOCK(parent); 1067 if (parent->tn_dir.tn_parent == NULL) { 1068 TMPFS_NODE_UNLOCK(parent); 1069 n = NULL; 1070 break; 1071 } 1072 n = parent; 1073 } 1074 TMPFS_UNLOCK(tmp); 1075 if (n == NULL) { 1076 error = EINVAL; 1077 if (newname != NULL) 1078 free(newname, M_TMPFSNAME); 1079 goto out_locked; 1080 } 1081 TMPFS_NODE_UNLOCK(n); 1082 1083 /* Adjust the parent pointer. */ 1084 TMPFS_VALIDATE_DIR(fnode); 1085 TMPFS_NODE_LOCK(de->td_node); 1086 de->td_node->tn_dir.tn_parent = tdnode; 1087 TMPFS_NODE_UNLOCK(de->td_node); 1088 1089 /* As a result of changing the target of the '..' 1090 * entry, the link count of the source and target 1091 * directories has to be adjusted. */ 1092 TMPFS_NODE_LOCK(tdnode); 1093 TMPFS_ASSERT_LOCKED(tdnode); 1094 tdnode->tn_links++; 1095 TMPFS_NODE_UNLOCK(tdnode); 1096 1097 TMPFS_NODE_LOCK(fdnode); 1098 TMPFS_ASSERT_LOCKED(fdnode); 1099 fdnode->tn_links--; 1100 TMPFS_NODE_UNLOCK(fdnode); 1101 } 1102 1103 /* Do the move: just remove the entry from the source directory 1104 * and insert it into the target one. */ 1105 tmpfs_dir_detach(fdvp, de); 1106 if (fcnp->cn_flags & DOWHITEOUT) 1107 tmpfs_dir_whiteout_add(fdvp, fcnp); 1108 if (tcnp->cn_flags & ISWHITEOUT) 1109 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1110 tmpfs_dir_attach(tdvp, de); 1111 } 1112 1113 /* If the name has changed, we need to make it effective by changing 1114 * it in the directory entry. */ 1115 if (newname != NULL) { 1116 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1117 1118 free(de->td_name, M_TMPFSNAME); 1119 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1120 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1121 de->td_name = newname; 1122 1123 fnode->tn_status |= TMPFS_NODE_CHANGED; 1124 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1125 } 1126 1127 /* If we are overwriting an entry, we have to remove the old one 1128 * from the target directory. */ 1129 if (tvp != NULL) { 1130 /* Remove the old entry from the target directory. */ 1131 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1132 tmpfs_dir_detach(tdvp, de); 1133 1134 /* Free the directory entry we just deleted. Note that the 1135 * node referred by it will not be removed until the vnode is 1136 * really reclaimed. */ 1137 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1138 } 1139 cache_purge(fvp); 1140 1141 error = 0; 1142 1143out_locked: 1144 if (fdvp != tdvp && fdvp != tvp) 1145 VOP_UNLOCK(fdvp, 0); 1146 1147out: 1148 /* Release target nodes. */ 1149 /* XXX: I don't understand when tdvp can be the same as tvp, but 1150 * other code takes care of this... */ 1151 if (tdvp == tvp) 1152 vrele(tdvp); 1153 else 1154 vput(tdvp); 1155 if (tvp != NULL) 1156 vput(tvp); 1157 1158 /* Release source nodes. */ 1159 vrele(fdvp); 1160 vrele(fvp); 1161 1162 return error; 1163} 1164 1165/* --------------------------------------------------------------------- */ 1166 1167static int 1168tmpfs_mkdir(struct vop_mkdir_args *v) 1169{ 1170 struct vnode *dvp = v->a_dvp; 1171 struct vnode **vpp = v->a_vpp; 1172 struct componentname *cnp = v->a_cnp; 1173 struct vattr *vap = v->a_vap; 1174 1175 MPASS(vap->va_type == VDIR); 1176 1177 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1178} 1179 1180/* --------------------------------------------------------------------- */ 1181 1182static int 1183tmpfs_rmdir(struct vop_rmdir_args *v) 1184{ 1185 struct vnode *dvp = v->a_dvp; 1186 struct vnode *vp = v->a_vp; 1187 1188 int error; 1189 struct tmpfs_dirent *de; 1190 struct tmpfs_mount *tmp; 1191 struct tmpfs_node *dnode; 1192 struct tmpfs_node *node; 1193 1194 MPASS(VOP_ISLOCKED(dvp)); 1195 MPASS(VOP_ISLOCKED(vp)); 1196 1197 tmp = VFS_TO_TMPFS(dvp->v_mount); 1198 dnode = VP_TO_TMPFS_DIR(dvp); 1199 node = VP_TO_TMPFS_DIR(vp); 1200 1201 /* Directories with more than two entries ('.' and '..') cannot be 1202 * removed. */ 1203 if (node->tn_size > 0) { 1204 error = ENOTEMPTY; 1205 goto out; 1206 } 1207 1208 if ((dnode->tn_flags & APPEND) 1209 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1210 error = EPERM; 1211 goto out; 1212 } 1213 1214 /* This invariant holds only if we are not trying to remove "..". 1215 * We checked for that above so this is safe now. */ 1216 MPASS(node->tn_dir.tn_parent == dnode); 1217 1218 /* Get the directory entry associated with node (vp). This was 1219 * filled by tmpfs_lookup while looking up the entry. */ 1220 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1221 MPASS(TMPFS_DIRENT_MATCHES(de, 1222 v->a_cnp->cn_nameptr, 1223 v->a_cnp->cn_namelen)); 1224 1225 /* Check flags to see if we are allowed to remove the directory. */ 1226 if (dnode->tn_flags & APPEND 1227 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1228 error = EPERM; 1229 goto out; 1230 } 1231 1232 1233 /* Detach the directory entry from the directory (dnode). */ 1234 tmpfs_dir_detach(dvp, de); 1235 if (v->a_cnp->cn_flags & DOWHITEOUT) 1236 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1237 1238 /* No vnode should be allocated for this entry from this point */ 1239 TMPFS_NODE_LOCK(node); 1240 TMPFS_ASSERT_ELOCKED(node); 1241 node->tn_links--; 1242 node->tn_dir.tn_parent = NULL; 1243 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1244 TMPFS_NODE_MODIFIED; 1245 1246 TMPFS_NODE_UNLOCK(node); 1247 1248 TMPFS_NODE_LOCK(dnode); 1249 TMPFS_ASSERT_ELOCKED(dnode); 1250 dnode->tn_links--; 1251 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1252 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1253 TMPFS_NODE_UNLOCK(dnode); 1254 1255 cache_purge(dvp); 1256 cache_purge(vp); 1257 1258 /* Free the directory entry we just deleted. Note that the node 1259 * referred by it will not be removed until the vnode is really 1260 * reclaimed. */ 1261 tmpfs_free_dirent(tmp, de, TRUE); 1262 1263 /* Release the deleted vnode (will destroy the node, notify 1264 * interested parties and clean it from the cache). */ 1265 1266 dnode->tn_status |= TMPFS_NODE_CHANGED; 1267 tmpfs_update(dvp); 1268 1269 error = 0; 1270 1271out: 1272 return error; 1273} 1274 1275/* --------------------------------------------------------------------- */ 1276 1277static int 1278tmpfs_symlink(struct vop_symlink_args *v) 1279{ 1280 struct vnode *dvp = v->a_dvp; 1281 struct vnode **vpp = v->a_vpp; 1282 struct componentname *cnp = v->a_cnp; 1283 struct vattr *vap = v->a_vap; 1284 char *target = v->a_target; 1285 1286#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1287 MPASS(vap->va_type == VLNK); 1288#else 1289 vap->va_type = VLNK; 1290#endif 1291 1292 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1293} 1294 1295/* --------------------------------------------------------------------- */ 1296 1297static int 1298tmpfs_readdir(struct vop_readdir_args *v) 1299{ 1300 struct vnode *vp = v->a_vp; 1301 struct uio *uio = v->a_uio; 1302 int *eofflag = v->a_eofflag; 1303 u_long **cookies = v->a_cookies; 1304 int *ncookies = v->a_ncookies; 1305 1306 int error; 1307 off_t startoff; 1308 off_t cnt = 0; 1309 struct tmpfs_node *node; 1310 1311 /* This operation only makes sense on directory nodes. */ 1312 if (vp->v_type != VDIR) 1313 return ENOTDIR; 1314 1315 node = VP_TO_TMPFS_DIR(vp); 1316 1317 startoff = uio->uio_offset; 1318 1319 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1320 error = tmpfs_dir_getdotdent(node, uio); 1321 if (error != 0) 1322 goto outok; 1323 cnt++; 1324 } 1325 1326 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1327 error = tmpfs_dir_getdotdotdent(node, uio); 1328 if (error != 0) 1329 goto outok; 1330 cnt++; 1331 } 1332 1333 error = tmpfs_dir_getdents(node, uio, &cnt); 1334 1335outok: 1336 MPASS(error >= -1); 1337 1338 if (error == -1) 1339 error = (cnt != 0) ? 0 : EINVAL; 1340 1341 if (eofflag != NULL) 1342 *eofflag = 1343 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1344 1345 /* Update NFS-related variables. */ 1346 if (error == 0 && cookies != NULL && ncookies != NULL) { 1347 off_t i; 1348 off_t off = startoff; 1349 struct tmpfs_dirent *de = NULL; 1350 1351 *ncookies = cnt; 1352 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1353 1354 for (i = 0; i < cnt; i++) { 1355 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1356 if (off == TMPFS_DIRCOOKIE_DOT) { 1357 off = TMPFS_DIRCOOKIE_DOTDOT; 1358 } else { 1359 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1360 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1361 } else if (de != NULL) { 1362 de = TAILQ_NEXT(de, td_entries); 1363 } else { 1364 de = tmpfs_dir_lookupbycookie(node, 1365 off); 1366 MPASS(de != NULL); 1367 de = TAILQ_NEXT(de, td_entries); 1368 } 1369 if (de == NULL) 1370 off = TMPFS_DIRCOOKIE_EOF; 1371 else 1372 off = tmpfs_dircookie(de); 1373 } 1374 1375 (*cookies)[i] = off; 1376 } 1377 MPASS(uio->uio_offset == off); 1378 } 1379 1380 return error; 1381} 1382 1383/* --------------------------------------------------------------------- */ 1384 1385static int 1386tmpfs_readlink(struct vop_readlink_args *v) 1387{ 1388 struct vnode *vp = v->a_vp; 1389 struct uio *uio = v->a_uio; 1390 1391 int error; 1392 struct tmpfs_node *node; 1393 1394 MPASS(uio->uio_offset == 0); 1395 MPASS(vp->v_type == VLNK); 1396 1397 node = VP_TO_TMPFS_NODE(vp); 1398 1399 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1400 uio); 1401 node->tn_status |= TMPFS_NODE_ACCESSED; 1402 1403 return error; 1404} 1405 1406/* --------------------------------------------------------------------- */ 1407 1408static int 1409tmpfs_inactive(struct vop_inactive_args *v) 1410{ 1411 struct vnode *vp = v->a_vp; 1412 struct thread *l = v->a_td; 1413 1414 struct tmpfs_node *node; 1415 1416 MPASS(VOP_ISLOCKED(vp)); 1417 1418 node = VP_TO_TMPFS_NODE(vp); 1419 1420 if (node->tn_links == 0) 1421 vrecycle(vp, l); 1422 1423 return 0; 1424} 1425 1426/* --------------------------------------------------------------------- */ 1427 1428int 1429tmpfs_reclaim(struct vop_reclaim_args *v) 1430{ 1431 struct vnode *vp = v->a_vp; 1432 1433 struct tmpfs_mount *tmp; 1434 struct tmpfs_node *node; 1435 1436 node = VP_TO_TMPFS_NODE(vp); 1437 tmp = VFS_TO_TMPFS(vp->v_mount); 1438 1439 vnode_destroy_vobject(vp); 1440 cache_purge(vp); 1441 1442 TMPFS_NODE_LOCK(node); 1443 TMPFS_ASSERT_ELOCKED(node); 1444 tmpfs_free_vp(vp); 1445 1446 /* If the node referenced by this vnode was deleted by the user, 1447 * we must free its associated data structures (now that the vnode 1448 * is being reclaimed). */ 1449 if (node->tn_links == 0 && 1450 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1451 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1452 TMPFS_NODE_UNLOCK(node); 1453 tmpfs_free_node(tmp, node); 1454 } else 1455 TMPFS_NODE_UNLOCK(node); 1456 1457 MPASS(vp->v_data == NULL); 1458 return 0; 1459} 1460 1461/* --------------------------------------------------------------------- */ 1462 1463static int 1464tmpfs_print(struct vop_print_args *v) 1465{ 1466 struct vnode *vp = v->a_vp; 1467 1468 struct tmpfs_node *node; 1469 1470 node = VP_TO_TMPFS_NODE(vp); 1471 1472 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1473 node, node->tn_flags, node->tn_links); 1474 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1475 ", status 0x%x\n", 1476 node->tn_mode, node->tn_uid, node->tn_gid, 1477 (uintmax_t)node->tn_size, node->tn_status); 1478 1479 if (vp->v_type == VFIFO) 1480 fifo_printinfo(vp); 1481 1482 printf("\n"); 1483 1484 return 0; 1485} 1486 1487/* --------------------------------------------------------------------- */ 1488 1489static int 1490tmpfs_pathconf(struct vop_pathconf_args *v) 1491{ 1492 int name = v->a_name; 1493 register_t *retval = v->a_retval; 1494 1495 int error; 1496 1497 error = 0; 1498 1499 switch (name) { 1500 case _PC_LINK_MAX: 1501 *retval = LINK_MAX; 1502 break; 1503 1504 case _PC_NAME_MAX: 1505 *retval = NAME_MAX; 1506 break; 1507 1508 case _PC_PATH_MAX: 1509 *retval = PATH_MAX; 1510 break; 1511 1512 case _PC_PIPE_BUF: 1513 *retval = PIPE_BUF; 1514 break; 1515 1516 case _PC_CHOWN_RESTRICTED: 1517 *retval = 1; 1518 break; 1519 1520 case _PC_NO_TRUNC: 1521 *retval = 1; 1522 break; 1523 1524 case _PC_SYNC_IO: 1525 *retval = 1; 1526 break; 1527 1528 case _PC_FILESIZEBITS: 1529 *retval = 0; /* XXX Don't know which value should I return. */ 1530 break; 1531 1532 default: 1533 error = EINVAL; 1534 } 1535 1536 return error; 1537} 1538 1539static int 1540tmpfs_vptofh(struct vop_vptofh_args *ap) 1541{ 1542 struct tmpfs_fid *tfhp; 1543 struct tmpfs_node *node; 1544 1545 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1546 node = VP_TO_TMPFS_NODE(ap->a_vp); 1547 1548 tfhp->tf_len = sizeof(struct tmpfs_fid); 1549 tfhp->tf_id = node->tn_id; 1550 tfhp->tf_gen = node->tn_gen; 1551 1552 return (0); 1553} 1554 1555static int 1556tmpfs_whiteout(struct vop_whiteout_args *ap) 1557{ 1558 struct vnode *dvp = ap->a_dvp; 1559 struct componentname *cnp = ap->a_cnp; 1560 struct tmpfs_dirent *de; 1561 1562 switch (ap->a_flags) { 1563 case LOOKUP: 1564 return (0); 1565 case CREATE: 1566 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1567 if (de != NULL) 1568 return (de->td_node == NULL ? 0 : EEXIST); 1569 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1570 case DELETE: 1571 tmpfs_dir_whiteout_remove(dvp, cnp); 1572 return (0); 1573 default: 1574 panic("tmpfs_whiteout: unknown op"); 1575 } 1576} 1577 1578/* --------------------------------------------------------------------- */ 1579 1580/* 1581 * vnode operations vector used for files stored in a tmpfs file system. 1582 */ 1583struct vop_vector tmpfs_vnodeop_entries = { 1584 .vop_default = &default_vnodeops, 1585 .vop_lookup = vfs_cache_lookup, 1586 .vop_cachedlookup = tmpfs_lookup, 1587 .vop_create = tmpfs_create, 1588 .vop_mknod = tmpfs_mknod, 1589 .vop_open = tmpfs_open, 1590 .vop_close = tmpfs_close, 1591 .vop_access = tmpfs_access, 1592 .vop_getattr = tmpfs_getattr, 1593 .vop_setattr = tmpfs_setattr, 1594 .vop_read = tmpfs_read, 1595 .vop_write = tmpfs_write, 1596 .vop_fsync = tmpfs_fsync, 1597 .vop_remove = tmpfs_remove, 1598 .vop_link = tmpfs_link, 1599 .vop_rename = tmpfs_rename, 1600 .vop_mkdir = tmpfs_mkdir, 1601 .vop_rmdir = tmpfs_rmdir, 1602 .vop_symlink = tmpfs_symlink, 1603 .vop_readdir = tmpfs_readdir, 1604 .vop_readlink = tmpfs_readlink, 1605 .vop_inactive = tmpfs_inactive, 1606 .vop_reclaim = tmpfs_reclaim, 1607 .vop_print = tmpfs_print, 1608 .vop_pathconf = tmpfs_pathconf, 1609 .vop_vptofh = tmpfs_vptofh, 1610 .vop_whiteout = tmpfs_whiteout, 1611 .vop_bmap = VOP_EOPNOTSUPP, 1612}; 1613 1614