tmpfs_vnops.c revision 212305
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 212305 2010-09-07 22:40:45Z ivoras $"); 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 struct tmpfs_node *node; 274 275 MPASS(VOP_ISLOCKED(vp)); 276 277 node = VP_TO_TMPFS_NODE(vp); 278 279 if (node->tn_links > 0) { 280 /* Update node times. No need to do it if the node has 281 * been deleted, because it will vanish after we return. */ 282 tmpfs_update(vp); 283 } 284 285 return 0; 286} 287 288/* --------------------------------------------------------------------- */ 289 290int 291tmpfs_access(struct vop_access_args *v) 292{ 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342} 343 344/* --------------------------------------------------------------------- */ 345 346int 347tmpfs_getattr(struct vop_getattr_args *v) 348{ 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379} 380 381/* --------------------------------------------------------------------- */ 382 383/* XXX Should this operation be atomic? I think it should, but code in 384 * XXX other places (e.g., ufs) doesn't seem to be... */ 385int 386tmpfs_setattr(struct vop_setattr_args *v) 387{ 388 struct vnode *vp = v->a_vp; 389 struct vattr *vap = v->a_vap; 390 struct ucred *cred = v->a_cred; 391 struct thread *td = curthread; 392 393 int error; 394 395 MPASS(VOP_ISLOCKED(vp)); 396 397 error = 0; 398 399 /* Abort if any unsettable attribute is given. */ 400 if (vap->va_type != VNON || 401 vap->va_nlink != VNOVAL || 402 vap->va_fsid != VNOVAL || 403 vap->va_fileid != VNOVAL || 404 vap->va_blocksize != VNOVAL || 405 vap->va_gen != VNOVAL || 406 vap->va_rdev != VNOVAL || 407 vap->va_bytes != VNOVAL) 408 error = EINVAL; 409 410 if (error == 0 && (vap->va_flags != VNOVAL)) 411 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 412 413 if (error == 0 && (vap->va_size != VNOVAL)) 414 error = tmpfs_chsize(vp, vap->va_size, cred, td); 415 416 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 420 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 421 422 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 423 vap->va_atime.tv_nsec != VNOVAL) || 424 (vap->va_mtime.tv_sec != VNOVAL && 425 vap->va_mtime.tv_nsec != VNOVAL) || 426 (vap->va_birthtime.tv_sec != VNOVAL && 427 vap->va_birthtime.tv_nsec != VNOVAL))) 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 &vap->va_birthtime, vap->va_vaflags, cred, td); 430 431 /* Update the node times. We give preference to the error codes 432 * generated by this function rather than the ones that may arise 433 * from tmpfs_update. */ 434 tmpfs_update(vp); 435 436 MPASS(VOP_ISLOCKED(vp)); 437 438 return error; 439} 440 441/* --------------------------------------------------------------------- */ 442static int 443tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 444 vm_offset_t offset, size_t tlen, struct uio *uio) 445{ 446 vm_page_t m; 447 int error; 448 449 VM_OBJECT_LOCK(tobj); 450 vm_object_pip_add(tobj, 1); 451 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 452 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 453 if (m->valid != VM_PAGE_BITS_ALL) { 454 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 455 error = vm_pager_get_pages(tobj, &m, 1, 0); 456 if (error != 0) { 457 printf("tmpfs get pages from pager error [read]\n"); 458 goto out; 459 } 460 } else 461 vm_page_zero_invalid(m, TRUE); 462 } 463 VM_OBJECT_UNLOCK(tobj); 464 error = uiomove_fromphys(&m, offset, tlen, uio); 465 VM_OBJECT_LOCK(tobj); 466out: 467 vm_page_lock(m); 468 vm_page_unwire(m, TRUE); 469 vm_page_unlock(m); 470 vm_page_wakeup(m); 471 vm_object_pip_subtract(tobj, 1); 472 VM_OBJECT_UNLOCK(tobj); 473 474 return (error); 475} 476 477static __inline int 478tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 479 vm_offset_t offset, size_t tlen, void *buf) 480{ 481 struct uio uio; 482 struct iovec iov; 483 484 uio.uio_iovcnt = 1; 485 uio.uio_iov = &iov; 486 iov.iov_base = buf; 487 iov.iov_len = tlen; 488 489 uio.uio_offset = 0; 490 uio.uio_resid = tlen; 491 uio.uio_rw = UIO_READ; 492 uio.uio_segflg = UIO_SYSSPACE; 493 uio.uio_td = curthread; 494 495 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 496} 497 498static int 499tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 500{ 501 struct sf_buf *sf; 502 vm_pindex_t idx; 503 vm_page_t m; 504 vm_offset_t offset; 505 off_t addr; 506 size_t tlen; 507 char *ma; 508 int error; 509 510 addr = uio->uio_offset; 511 idx = OFF_TO_IDX(addr); 512 offset = addr & PAGE_MASK; 513 tlen = MIN(PAGE_SIZE - offset, len); 514 515 if ((vobj == NULL) || 516 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 517 goto nocache; 518 519 VM_OBJECT_LOCK(vobj); 520lookupvpg: 521 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 522 vm_page_is_valid(m, offset, tlen)) { 523 if ((m->oflags & VPO_BUSY) != 0) { 524 /* 525 * Reference the page before unlocking and sleeping so 526 * that the page daemon is less likely to reclaim it. 527 */ 528 vm_page_lock_queues(); 529 vm_page_flag_set(m, PG_REFERENCED); 530 vm_page_sleep(m, "tmfsmr"); 531 goto lookupvpg; 532 } 533 vm_page_busy(m); 534 VM_OBJECT_UNLOCK(vobj); 535 error = uiomove_fromphys(&m, offset, tlen, uio); 536 VM_OBJECT_LOCK(vobj); 537 vm_page_wakeup(m); 538 VM_OBJECT_UNLOCK(vobj); 539 return (error); 540 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 541 if ((m->oflags & VPO_BUSY) != 0) { 542 /* 543 * Reference the page before unlocking and sleeping so 544 * that the page daemon is less likely to reclaim it. 545 */ 546 vm_page_lock_queues(); 547 vm_page_flag_set(m, PG_REFERENCED); 548 vm_page_sleep(m, "tmfsmr"); 549 goto lookupvpg; 550 } 551 vm_page_busy(m); 552 VM_OBJECT_UNLOCK(vobj); 553 sched_pin(); 554 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 555 ma = (char *)sf_buf_kva(sf); 556 error = tmpfs_nocacheread_buf(tobj, idx, offset, tlen, 557 ma + offset); 558 if (error == 0) { 559 uio->uio_offset += tlen; 560 uio->uio_resid -= tlen; 561 } 562 sf_buf_free(sf); 563 sched_unpin(); 564 VM_OBJECT_LOCK(vobj); 565 vm_page_wakeup(m); 566 VM_OBJECT_UNLOCK(vobj); 567 return (error); 568 } 569 VM_OBJECT_UNLOCK(vobj); 570nocache: 571 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 572 573 return (error); 574} 575 576static int 577tmpfs_read(struct vop_read_args *v) 578{ 579 struct vnode *vp = v->a_vp; 580 struct uio *uio = v->a_uio; 581 582 struct tmpfs_node *node; 583 vm_object_t uobj; 584 size_t len; 585 int resid; 586 587 int error = 0; 588 589 node = VP_TO_TMPFS_NODE(vp); 590 591 if (vp->v_type != VREG) { 592 error = EISDIR; 593 goto out; 594 } 595 596 if (uio->uio_offset < 0) { 597 error = EINVAL; 598 goto out; 599 } 600 601 node->tn_status |= TMPFS_NODE_ACCESSED; 602 603 uobj = node->tn_reg.tn_aobj; 604 while ((resid = uio->uio_resid) > 0) { 605 error = 0; 606 if (node->tn_size <= uio->uio_offset) 607 break; 608 len = MIN(node->tn_size - uio->uio_offset, resid); 609 if (len == 0) 610 break; 611 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 612 if ((error != 0) || (resid == uio->uio_resid)) 613 break; 614 } 615 616out: 617 618 return error; 619} 620 621/* --------------------------------------------------------------------- */ 622 623static int 624tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 625{ 626 vm_pindex_t idx; 627 vm_page_t vpg, tpg; 628 vm_offset_t offset; 629 off_t addr; 630 size_t tlen; 631 int error; 632 633 error = 0; 634 635 addr = uio->uio_offset; 636 idx = OFF_TO_IDX(addr); 637 offset = addr & PAGE_MASK; 638 tlen = MIN(PAGE_SIZE - offset, len); 639 640 if ((vobj == NULL) || 641 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 642 vpg = NULL; 643 goto nocache; 644 } 645 646 VM_OBJECT_LOCK(vobj); 647lookupvpg: 648 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 649 vm_page_is_valid(vpg, offset, tlen)) { 650 if ((vpg->oflags & VPO_BUSY) != 0) { 651 /* 652 * Reference the page before unlocking and sleeping so 653 * that the page daemon is less likely to reclaim it. 654 */ 655 vm_page_lock_queues(); 656 vm_page_flag_set(vpg, PG_REFERENCED); 657 vm_page_sleep(vpg, "tmfsmw"); 658 goto lookupvpg; 659 } 660 vm_page_busy(vpg); 661 vm_page_undirty(vpg); 662 VM_OBJECT_UNLOCK(vobj); 663 error = uiomove_fromphys(&vpg, offset, tlen, uio); 664 } else { 665 if (__predict_false(vobj->cache != NULL)) 666 vm_page_cache_free(vobj, idx, idx + 1); 667 VM_OBJECT_UNLOCK(vobj); 668 vpg = NULL; 669 } 670nocache: 671 VM_OBJECT_LOCK(tobj); 672 vm_object_pip_add(tobj, 1); 673 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 674 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 675 if (tpg->valid != VM_PAGE_BITS_ALL) { 676 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 677 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 678 if (error != 0) { 679 printf("tmpfs get pages from pager error [write]\n"); 680 goto out; 681 } 682 } else 683 vm_page_zero_invalid(tpg, TRUE); 684 } 685 VM_OBJECT_UNLOCK(tobj); 686 if (vpg == NULL) 687 error = uiomove_fromphys(&tpg, offset, tlen, uio); 688 else { 689 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 690 pmap_copy_page(vpg, tpg); 691 } 692 VM_OBJECT_LOCK(tobj); 693out: 694 if (vobj != NULL) 695 VM_OBJECT_LOCK(vobj); 696 if (error == 0) { 697 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 698 ("parts of tpg invalid")); 699 vm_page_dirty(tpg); 700 } 701 vm_page_lock(tpg); 702 vm_page_unwire(tpg, TRUE); 703 vm_page_unlock(tpg); 704 vm_page_wakeup(tpg); 705 if (vpg != NULL) 706 vm_page_wakeup(vpg); 707 if (vobj != NULL) 708 VM_OBJECT_UNLOCK(vobj); 709 vm_object_pip_subtract(tobj, 1); 710 VM_OBJECT_UNLOCK(tobj); 711 712 return (error); 713} 714 715static int 716tmpfs_write(struct vop_write_args *v) 717{ 718 struct vnode *vp = v->a_vp; 719 struct uio *uio = v->a_uio; 720 int ioflag = v->a_ioflag; 721 722 boolean_t extended; 723 int error = 0; 724 off_t oldsize; 725 struct tmpfs_node *node; 726 vm_object_t uobj; 727 size_t len; 728 int resid; 729 730 node = VP_TO_TMPFS_NODE(vp); 731 oldsize = node->tn_size; 732 733 if (uio->uio_offset < 0 || vp->v_type != VREG) { 734 error = EINVAL; 735 goto out; 736 } 737 738 if (uio->uio_resid == 0) { 739 error = 0; 740 goto out; 741 } 742 743 if (ioflag & IO_APPEND) 744 uio->uio_offset = node->tn_size; 745 746 if (uio->uio_offset + uio->uio_resid > 747 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 748 return (EFBIG); 749 750 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 751 return (EFBIG); 752 753 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 754 if (extended) { 755 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 756 if (error != 0) 757 goto out; 758 } 759 760 uobj = node->tn_reg.tn_aobj; 761 while ((resid = uio->uio_resid) > 0) { 762 if (node->tn_size <= uio->uio_offset) 763 break; 764 len = MIN(node->tn_size - uio->uio_offset, resid); 765 if (len == 0) 766 break; 767 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 768 if ((error != 0) || (resid == uio->uio_resid)) 769 break; 770 } 771 772 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 773 (extended ? TMPFS_NODE_CHANGED : 0); 774 775 if (node->tn_mode & (S_ISUID | S_ISGID)) { 776 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 777 node->tn_mode &= ~(S_ISUID | S_ISGID); 778 } 779 780 if (error != 0) 781 (void)tmpfs_reg_resize(vp, oldsize); 782 783out: 784 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 785 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 786 787 return error; 788} 789 790/* --------------------------------------------------------------------- */ 791 792static int 793tmpfs_fsync(struct vop_fsync_args *v) 794{ 795 struct vnode *vp = v->a_vp; 796 797 MPASS(VOP_ISLOCKED(vp)); 798 799 tmpfs_update(vp); 800 801 return 0; 802} 803 804/* --------------------------------------------------------------------- */ 805 806static int 807tmpfs_remove(struct vop_remove_args *v) 808{ 809 struct vnode *dvp = v->a_dvp; 810 struct vnode *vp = v->a_vp; 811 812 int error; 813 struct tmpfs_dirent *de; 814 struct tmpfs_mount *tmp; 815 struct tmpfs_node *dnode; 816 struct tmpfs_node *node; 817 818 MPASS(VOP_ISLOCKED(dvp)); 819 MPASS(VOP_ISLOCKED(vp)); 820 821 if (vp->v_type == VDIR) { 822 error = EISDIR; 823 goto out; 824 } 825 826 dnode = VP_TO_TMPFS_DIR(dvp); 827 node = VP_TO_TMPFS_NODE(vp); 828 tmp = VFS_TO_TMPFS(vp->v_mount); 829 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 830 MPASS(de != NULL); 831 832 /* Files marked as immutable or append-only cannot be deleted. */ 833 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 834 (dnode->tn_flags & APPEND)) { 835 error = EPERM; 836 goto out; 837 } 838 839 /* Remove the entry from the directory; as it is a file, we do not 840 * have to change the number of hard links of the directory. */ 841 tmpfs_dir_detach(dvp, de); 842 if (v->a_cnp->cn_flags & DOWHITEOUT) 843 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 844 845 /* Free the directory entry we just deleted. Note that the node 846 * referred by it will not be removed until the vnode is really 847 * reclaimed. */ 848 tmpfs_free_dirent(tmp, de, TRUE); 849 850 if (node->tn_links > 0) 851 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 852 TMPFS_NODE_MODIFIED; 853 error = 0; 854 855out: 856 857 return error; 858} 859 860/* --------------------------------------------------------------------- */ 861 862static int 863tmpfs_link(struct vop_link_args *v) 864{ 865 struct vnode *dvp = v->a_tdvp; 866 struct vnode *vp = v->a_vp; 867 struct componentname *cnp = v->a_cnp; 868 869 int error; 870 struct tmpfs_dirent *de; 871 struct tmpfs_node *node; 872 873 MPASS(VOP_ISLOCKED(dvp)); 874 MPASS(cnp->cn_flags & HASBUF); 875 MPASS(dvp != vp); /* XXX When can this be false? */ 876 877 node = VP_TO_TMPFS_NODE(vp); 878 879 /* XXX: Why aren't the following two tests done by the caller? */ 880 881 /* Hard links of directories are forbidden. */ 882 if (vp->v_type == VDIR) { 883 error = EPERM; 884 goto out; 885 } 886 887 /* Cannot create cross-device links. */ 888 if (dvp->v_mount != vp->v_mount) { 889 error = EXDEV; 890 goto out; 891 } 892 893 /* Ensure that we do not overflow the maximum number of links imposed 894 * by the system. */ 895 MPASS(node->tn_links <= LINK_MAX); 896 if (node->tn_links == LINK_MAX) { 897 error = EMLINK; 898 goto out; 899 } 900 901 /* We cannot create links of files marked immutable or append-only. */ 902 if (node->tn_flags & (IMMUTABLE | APPEND)) { 903 error = EPERM; 904 goto out; 905 } 906 907 /* Allocate a new directory entry to represent the node. */ 908 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 909 cnp->cn_nameptr, cnp->cn_namelen, &de); 910 if (error != 0) 911 goto out; 912 913 /* Insert the new directory entry into the appropriate directory. */ 914 if (cnp->cn_flags & ISWHITEOUT) 915 tmpfs_dir_whiteout_remove(dvp, cnp); 916 tmpfs_dir_attach(dvp, de); 917 918 /* vp link count has changed, so update node times. */ 919 node->tn_status |= TMPFS_NODE_CHANGED; 920 tmpfs_update(vp); 921 922 error = 0; 923 924out: 925 return error; 926} 927 928/* --------------------------------------------------------------------- */ 929 930static int 931tmpfs_rename(struct vop_rename_args *v) 932{ 933 struct vnode *fdvp = v->a_fdvp; 934 struct vnode *fvp = v->a_fvp; 935 struct componentname *fcnp = v->a_fcnp; 936 struct vnode *tdvp = v->a_tdvp; 937 struct vnode *tvp = v->a_tvp; 938 struct componentname *tcnp = v->a_tcnp; 939 940 char *newname; 941 int error; 942 struct tmpfs_dirent *de; 943 struct tmpfs_mount *tmp; 944 struct tmpfs_node *fdnode; 945 struct tmpfs_node *fnode; 946 struct tmpfs_node *tnode; 947 struct tmpfs_node *tdnode; 948 949 MPASS(VOP_ISLOCKED(tdvp)); 950 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 951 MPASS(fcnp->cn_flags & HASBUF); 952 MPASS(tcnp->cn_flags & HASBUF); 953 954 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 955 956 /* Disallow cross-device renames. 957 * XXX Why isn't this done by the caller? */ 958 if (fvp->v_mount != tdvp->v_mount || 959 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 960 error = EXDEV; 961 goto out; 962 } 963 964 tmp = VFS_TO_TMPFS(tdvp->v_mount); 965 tdnode = VP_TO_TMPFS_DIR(tdvp); 966 967 /* If source and target are the same file, there is nothing to do. */ 968 if (fvp == tvp) { 969 error = 0; 970 goto out; 971 } 972 973 /* If we need to move the directory between entries, lock the 974 * source so that we can safely operate on it. */ 975 if (tdvp != fdvp) { 976 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 977 if (error != 0) 978 goto out; 979 } 980 fdnode = VP_TO_TMPFS_DIR(fdvp); 981 fnode = VP_TO_TMPFS_NODE(fvp); 982 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 983 984 /* Entry can disappear before we lock fdvp, 985 * also avoid manipulating '.' and '..' entries. */ 986 if (de == NULL) { 987 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 988 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 989 error = EINVAL; 990 else 991 error = ENOENT; 992 goto out_locked; 993 } 994 MPASS(de->td_node == fnode); 995 996 /* If re-naming a directory to another preexisting directory 997 * ensure that the target directory is empty so that its 998 * removal causes no side effects. 999 * Kern_rename gurantees the destination to be a directory 1000 * if the source is one. */ 1001 if (tvp != NULL) { 1002 MPASS(tnode != NULL); 1003 1004 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1005 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1006 error = EPERM; 1007 goto out_locked; 1008 } 1009 1010 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1011 if (tnode->tn_size > 0) { 1012 error = ENOTEMPTY; 1013 goto out_locked; 1014 } 1015 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1016 error = ENOTDIR; 1017 goto out_locked; 1018 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1019 error = EISDIR; 1020 goto out_locked; 1021 } else { 1022 MPASS(fnode->tn_type != VDIR && 1023 tnode->tn_type != VDIR); 1024 } 1025 } 1026 1027 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1028 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1029 error = EPERM; 1030 goto out_locked; 1031 } 1032 1033 /* Ensure that we have enough memory to hold the new name, if it 1034 * has to be changed. */ 1035 if (fcnp->cn_namelen != tcnp->cn_namelen || 1036 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1037 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1038 } else 1039 newname = NULL; 1040 1041 /* If the node is being moved to another directory, we have to do 1042 * the move. */ 1043 if (fdnode != tdnode) { 1044 /* In case we are moving a directory, we have to adjust its 1045 * parent to point to the new parent. */ 1046 if (de->td_node->tn_type == VDIR) { 1047 struct tmpfs_node *n; 1048 1049 /* Ensure the target directory is not a child of the 1050 * directory being moved. Otherwise, we'd end up 1051 * with stale nodes. */ 1052 n = tdnode; 1053 /* TMPFS_LOCK garanties that no nodes are freed while 1054 * traversing the list. Nodes can only be marked as 1055 * removed: tn_parent == NULL. */ 1056 TMPFS_LOCK(tmp); 1057 TMPFS_NODE_LOCK(n); 1058 while (n != n->tn_dir.tn_parent) { 1059 struct tmpfs_node *parent; 1060 1061 if (n == fnode) { 1062 TMPFS_NODE_UNLOCK(n); 1063 TMPFS_UNLOCK(tmp); 1064 error = EINVAL; 1065 if (newname != NULL) 1066 free(newname, M_TMPFSNAME); 1067 goto out_locked; 1068 } 1069 parent = n->tn_dir.tn_parent; 1070 TMPFS_NODE_UNLOCK(n); 1071 if (parent == NULL) { 1072 n = NULL; 1073 break; 1074 } 1075 TMPFS_NODE_LOCK(parent); 1076 if (parent->tn_dir.tn_parent == NULL) { 1077 TMPFS_NODE_UNLOCK(parent); 1078 n = NULL; 1079 break; 1080 } 1081 n = parent; 1082 } 1083 TMPFS_UNLOCK(tmp); 1084 if (n == NULL) { 1085 error = EINVAL; 1086 if (newname != NULL) 1087 free(newname, M_TMPFSNAME); 1088 goto out_locked; 1089 } 1090 TMPFS_NODE_UNLOCK(n); 1091 1092 /* Adjust the parent pointer. */ 1093 TMPFS_VALIDATE_DIR(fnode); 1094 TMPFS_NODE_LOCK(de->td_node); 1095 de->td_node->tn_dir.tn_parent = tdnode; 1096 TMPFS_NODE_UNLOCK(de->td_node); 1097 1098 /* As a result of changing the target of the '..' 1099 * entry, the link count of the source and target 1100 * directories has to be adjusted. */ 1101 TMPFS_NODE_LOCK(tdnode); 1102 TMPFS_ASSERT_LOCKED(tdnode); 1103 tdnode->tn_links++; 1104 TMPFS_NODE_UNLOCK(tdnode); 1105 1106 TMPFS_NODE_LOCK(fdnode); 1107 TMPFS_ASSERT_LOCKED(fdnode); 1108 fdnode->tn_links--; 1109 TMPFS_NODE_UNLOCK(fdnode); 1110 } 1111 1112 /* Do the move: just remove the entry from the source directory 1113 * and insert it into the target one. */ 1114 tmpfs_dir_detach(fdvp, de); 1115 if (fcnp->cn_flags & DOWHITEOUT) 1116 tmpfs_dir_whiteout_add(fdvp, fcnp); 1117 if (tcnp->cn_flags & ISWHITEOUT) 1118 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1119 tmpfs_dir_attach(tdvp, de); 1120 } 1121 1122 /* If the name has changed, we need to make it effective by changing 1123 * it in the directory entry. */ 1124 if (newname != NULL) { 1125 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1126 1127 free(de->td_name, M_TMPFSNAME); 1128 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1129 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1130 de->td_name = newname; 1131 1132 fnode->tn_status |= TMPFS_NODE_CHANGED; 1133 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1134 } 1135 1136 /* If we are overwriting an entry, we have to remove the old one 1137 * from the target directory. */ 1138 if (tvp != NULL) { 1139 /* Remove the old entry from the target directory. */ 1140 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1141 tmpfs_dir_detach(tdvp, de); 1142 1143 /* Free the directory entry we just deleted. Note that the 1144 * node referred by it will not be removed until the vnode is 1145 * really reclaimed. */ 1146 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1147 } 1148 1149 error = 0; 1150 1151out_locked: 1152 if (fdnode != tdnode) 1153 VOP_UNLOCK(fdvp, 0); 1154 1155out: 1156 /* Release target nodes. */ 1157 /* XXX: I don't understand when tdvp can be the same as tvp, but 1158 * other code takes care of this... */ 1159 if (tdvp == tvp) 1160 vrele(tdvp); 1161 else 1162 vput(tdvp); 1163 if (tvp != NULL) 1164 vput(tvp); 1165 1166 /* Release source nodes. */ 1167 vrele(fdvp); 1168 vrele(fvp); 1169 1170 return error; 1171} 1172 1173/* --------------------------------------------------------------------- */ 1174 1175static int 1176tmpfs_mkdir(struct vop_mkdir_args *v) 1177{ 1178 struct vnode *dvp = v->a_dvp; 1179 struct vnode **vpp = v->a_vpp; 1180 struct componentname *cnp = v->a_cnp; 1181 struct vattr *vap = v->a_vap; 1182 1183 MPASS(vap->va_type == VDIR); 1184 1185 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1186} 1187 1188/* --------------------------------------------------------------------- */ 1189 1190static int 1191tmpfs_rmdir(struct vop_rmdir_args *v) 1192{ 1193 struct vnode *dvp = v->a_dvp; 1194 struct vnode *vp = v->a_vp; 1195 1196 int error; 1197 struct tmpfs_dirent *de; 1198 struct tmpfs_mount *tmp; 1199 struct tmpfs_node *dnode; 1200 struct tmpfs_node *node; 1201 1202 MPASS(VOP_ISLOCKED(dvp)); 1203 MPASS(VOP_ISLOCKED(vp)); 1204 1205 tmp = VFS_TO_TMPFS(dvp->v_mount); 1206 dnode = VP_TO_TMPFS_DIR(dvp); 1207 node = VP_TO_TMPFS_DIR(vp); 1208 1209 /* Directories with more than two entries ('.' and '..') cannot be 1210 * removed. */ 1211 if (node->tn_size > 0) { 1212 error = ENOTEMPTY; 1213 goto out; 1214 } 1215 1216 if ((dnode->tn_flags & APPEND) 1217 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1218 error = EPERM; 1219 goto out; 1220 } 1221 1222 /* This invariant holds only if we are not trying to remove "..". 1223 * We checked for that above so this is safe now. */ 1224 MPASS(node->tn_dir.tn_parent == dnode); 1225 1226 /* Get the directory entry associated with node (vp). This was 1227 * filled by tmpfs_lookup while looking up the entry. */ 1228 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1229 MPASS(TMPFS_DIRENT_MATCHES(de, 1230 v->a_cnp->cn_nameptr, 1231 v->a_cnp->cn_namelen)); 1232 1233 /* Check flags to see if we are allowed to remove the directory. */ 1234 if (dnode->tn_flags & APPEND 1235 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1236 error = EPERM; 1237 goto out; 1238 } 1239 1240 1241 /* Detach the directory entry from the directory (dnode). */ 1242 tmpfs_dir_detach(dvp, de); 1243 if (v->a_cnp->cn_flags & DOWHITEOUT) 1244 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1245 1246 /* No vnode should be allocated for this entry from this point */ 1247 TMPFS_NODE_LOCK(node); 1248 TMPFS_ASSERT_ELOCKED(node); 1249 node->tn_links--; 1250 node->tn_dir.tn_parent = NULL; 1251 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1252 TMPFS_NODE_MODIFIED; 1253 1254 TMPFS_NODE_UNLOCK(node); 1255 1256 TMPFS_NODE_LOCK(dnode); 1257 TMPFS_ASSERT_ELOCKED(dnode); 1258 dnode->tn_links--; 1259 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1260 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1261 TMPFS_NODE_UNLOCK(dnode); 1262 1263 cache_purge(dvp); 1264 cache_purge(vp); 1265 1266 /* Free the directory entry we just deleted. Note that the node 1267 * referred by it will not be removed until the vnode is really 1268 * reclaimed. */ 1269 tmpfs_free_dirent(tmp, de, TRUE); 1270 1271 /* Release the deleted vnode (will destroy the node, notify 1272 * interested parties and clean it from the cache). */ 1273 1274 dnode->tn_status |= TMPFS_NODE_CHANGED; 1275 tmpfs_update(dvp); 1276 1277 error = 0; 1278 1279out: 1280 return error; 1281} 1282 1283/* --------------------------------------------------------------------- */ 1284 1285static int 1286tmpfs_symlink(struct vop_symlink_args *v) 1287{ 1288 struct vnode *dvp = v->a_dvp; 1289 struct vnode **vpp = v->a_vpp; 1290 struct componentname *cnp = v->a_cnp; 1291 struct vattr *vap = v->a_vap; 1292 char *target = v->a_target; 1293 1294#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1295 MPASS(vap->va_type == VLNK); 1296#else 1297 vap->va_type = VLNK; 1298#endif 1299 1300 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1301} 1302 1303/* --------------------------------------------------------------------- */ 1304 1305static int 1306tmpfs_readdir(struct vop_readdir_args *v) 1307{ 1308 struct vnode *vp = v->a_vp; 1309 struct uio *uio = v->a_uio; 1310 int *eofflag = v->a_eofflag; 1311 u_long **cookies = v->a_cookies; 1312 int *ncookies = v->a_ncookies; 1313 1314 int error; 1315 off_t startoff; 1316 off_t cnt = 0; 1317 struct tmpfs_node *node; 1318 1319 /* This operation only makes sense on directory nodes. */ 1320 if (vp->v_type != VDIR) 1321 return ENOTDIR; 1322 1323 node = VP_TO_TMPFS_DIR(vp); 1324 1325 startoff = uio->uio_offset; 1326 1327 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1328 error = tmpfs_dir_getdotdent(node, uio); 1329 if (error != 0) 1330 goto outok; 1331 cnt++; 1332 } 1333 1334 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1335 error = tmpfs_dir_getdotdotdent(node, uio); 1336 if (error != 0) 1337 goto outok; 1338 cnt++; 1339 } 1340 1341 error = tmpfs_dir_getdents(node, uio, &cnt); 1342 1343outok: 1344 MPASS(error >= -1); 1345 1346 if (error == -1) 1347 error = 0; 1348 1349 if (eofflag != NULL) 1350 *eofflag = 1351 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1352 1353 /* Update NFS-related variables. */ 1354 if (error == 0 && cookies != NULL && ncookies != NULL) { 1355 off_t i; 1356 off_t off = startoff; 1357 struct tmpfs_dirent *de = NULL; 1358 1359 *ncookies = cnt; 1360 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1361 1362 for (i = 0; i < cnt; i++) { 1363 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1364 if (off == TMPFS_DIRCOOKIE_DOT) { 1365 off = TMPFS_DIRCOOKIE_DOTDOT; 1366 } else { 1367 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1368 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1369 } else if (de != NULL) { 1370 de = TAILQ_NEXT(de, td_entries); 1371 } else { 1372 de = tmpfs_dir_lookupbycookie(node, 1373 off); 1374 MPASS(de != NULL); 1375 de = TAILQ_NEXT(de, td_entries); 1376 } 1377 if (de == NULL) 1378 off = TMPFS_DIRCOOKIE_EOF; 1379 else 1380 off = tmpfs_dircookie(de); 1381 } 1382 1383 (*cookies)[i] = off; 1384 } 1385 MPASS(uio->uio_offset == off); 1386 } 1387 1388 return error; 1389} 1390 1391/* --------------------------------------------------------------------- */ 1392 1393static int 1394tmpfs_readlink(struct vop_readlink_args *v) 1395{ 1396 struct vnode *vp = v->a_vp; 1397 struct uio *uio = v->a_uio; 1398 1399 int error; 1400 struct tmpfs_node *node; 1401 1402 MPASS(uio->uio_offset == 0); 1403 MPASS(vp->v_type == VLNK); 1404 1405 node = VP_TO_TMPFS_NODE(vp); 1406 1407 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1408 uio); 1409 node->tn_status |= TMPFS_NODE_ACCESSED; 1410 1411 return error; 1412} 1413 1414/* --------------------------------------------------------------------- */ 1415 1416static int 1417tmpfs_inactive(struct vop_inactive_args *v) 1418{ 1419 struct vnode *vp = v->a_vp; 1420 struct thread *l = v->a_td; 1421 1422 struct tmpfs_node *node; 1423 1424 MPASS(VOP_ISLOCKED(vp)); 1425 1426 node = VP_TO_TMPFS_NODE(vp); 1427 1428 if (node->tn_links == 0) 1429 vrecycle(vp, l); 1430 1431 return 0; 1432} 1433 1434/* --------------------------------------------------------------------- */ 1435 1436int 1437tmpfs_reclaim(struct vop_reclaim_args *v) 1438{ 1439 struct vnode *vp = v->a_vp; 1440 1441 struct tmpfs_mount *tmp; 1442 struct tmpfs_node *node; 1443 1444 node = VP_TO_TMPFS_NODE(vp); 1445 tmp = VFS_TO_TMPFS(vp->v_mount); 1446 1447 vnode_destroy_vobject(vp); 1448 cache_purge(vp); 1449 1450 TMPFS_NODE_LOCK(node); 1451 TMPFS_ASSERT_ELOCKED(node); 1452 tmpfs_free_vp(vp); 1453 1454 /* If the node referenced by this vnode was deleted by the user, 1455 * we must free its associated data structures (now that the vnode 1456 * is being reclaimed). */ 1457 if (node->tn_links == 0 && 1458 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1459 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1460 TMPFS_NODE_UNLOCK(node); 1461 tmpfs_free_node(tmp, node); 1462 } else 1463 TMPFS_NODE_UNLOCK(node); 1464 1465 MPASS(vp->v_data == NULL); 1466 return 0; 1467} 1468 1469/* --------------------------------------------------------------------- */ 1470 1471static int 1472tmpfs_print(struct vop_print_args *v) 1473{ 1474 struct vnode *vp = v->a_vp; 1475 1476 struct tmpfs_node *node; 1477 1478 node = VP_TO_TMPFS_NODE(vp); 1479 1480 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1481 node, node->tn_flags, node->tn_links); 1482 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1483 ", status 0x%x\n", 1484 node->tn_mode, node->tn_uid, node->tn_gid, 1485 (uintmax_t)node->tn_size, node->tn_status); 1486 1487 if (vp->v_type == VFIFO) 1488 fifo_printinfo(vp); 1489 1490 printf("\n"); 1491 1492 return 0; 1493} 1494 1495/* --------------------------------------------------------------------- */ 1496 1497static int 1498tmpfs_pathconf(struct vop_pathconf_args *v) 1499{ 1500 int name = v->a_name; 1501 register_t *retval = v->a_retval; 1502 1503 int error; 1504 1505 error = 0; 1506 1507 switch (name) { 1508 case _PC_LINK_MAX: 1509 *retval = LINK_MAX; 1510 break; 1511 1512 case _PC_NAME_MAX: 1513 *retval = NAME_MAX; 1514 break; 1515 1516 case _PC_PATH_MAX: 1517 *retval = PATH_MAX; 1518 break; 1519 1520 case _PC_PIPE_BUF: 1521 *retval = PIPE_BUF; 1522 break; 1523 1524 case _PC_CHOWN_RESTRICTED: 1525 *retval = 1; 1526 break; 1527 1528 case _PC_NO_TRUNC: 1529 *retval = 1; 1530 break; 1531 1532 case _PC_SYNC_IO: 1533 *retval = 1; 1534 break; 1535 1536 case _PC_FILESIZEBITS: 1537 *retval = 0; /* XXX Don't know which value should I return. */ 1538 break; 1539 1540 default: 1541 error = EINVAL; 1542 } 1543 1544 return error; 1545} 1546 1547static int 1548tmpfs_vptofh(struct vop_vptofh_args *ap) 1549{ 1550 struct tmpfs_fid *tfhp; 1551 struct tmpfs_node *node; 1552 1553 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1554 node = VP_TO_TMPFS_NODE(ap->a_vp); 1555 1556 tfhp->tf_len = sizeof(struct tmpfs_fid); 1557 tfhp->tf_id = node->tn_id; 1558 tfhp->tf_gen = node->tn_gen; 1559 1560 return (0); 1561} 1562 1563static int 1564tmpfs_whiteout(struct vop_whiteout_args *ap) 1565{ 1566 struct vnode *dvp = ap->a_dvp; 1567 struct componentname *cnp = ap->a_cnp; 1568 struct tmpfs_dirent *de; 1569 1570 switch (ap->a_flags) { 1571 case LOOKUP: 1572 return (0); 1573 case CREATE: 1574 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1575 if (de != NULL) 1576 return (de->td_node == NULL ? 0 : EEXIST); 1577 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1578 case DELETE: 1579 tmpfs_dir_whiteout_remove(dvp, cnp); 1580 return (0); 1581 default: 1582 panic("tmpfs_whiteout: unknown op"); 1583 } 1584} 1585 1586/* --------------------------------------------------------------------- */ 1587 1588/* 1589 * vnode operations vector used for files stored in a tmpfs file system. 1590 */ 1591struct vop_vector tmpfs_vnodeop_entries = { 1592 .vop_default = &default_vnodeops, 1593 .vop_lookup = vfs_cache_lookup, 1594 .vop_cachedlookup = tmpfs_lookup, 1595 .vop_create = tmpfs_create, 1596 .vop_mknod = tmpfs_mknod, 1597 .vop_open = tmpfs_open, 1598 .vop_close = tmpfs_close, 1599 .vop_access = tmpfs_access, 1600 .vop_getattr = tmpfs_getattr, 1601 .vop_setattr = tmpfs_setattr, 1602 .vop_read = tmpfs_read, 1603 .vop_write = tmpfs_write, 1604 .vop_fsync = tmpfs_fsync, 1605 .vop_remove = tmpfs_remove, 1606 .vop_link = tmpfs_link, 1607 .vop_rename = tmpfs_rename, 1608 .vop_mkdir = tmpfs_mkdir, 1609 .vop_rmdir = tmpfs_rmdir, 1610 .vop_symlink = tmpfs_symlink, 1611 .vop_readdir = tmpfs_readdir, 1612 .vop_readlink = tmpfs_readlink, 1613 .vop_inactive = tmpfs_inactive, 1614 .vop_reclaim = tmpfs_reclaim, 1615 .vop_print = tmpfs_print, 1616 .vop_pathconf = tmpfs_pathconf, 1617 .vop_vptofh = tmpfs_vptofh, 1618 .vop_whiteout = tmpfs_whiteout, 1619 .vop_bmap = VOP_EOPNOTSUPP, 1620}; 1621 1622