tmpfs_vnops.c revision 212650
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 212650 2010-09-15 10:31:27Z avg $"); 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 if (error == 0) 566 vm_page_set_valid(m, offset, tlen); 567 vm_page_wakeup(m); 568 VM_OBJECT_UNLOCK(vobj); 569 return (error); 570 } 571 VM_OBJECT_UNLOCK(vobj); 572nocache: 573 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 574 575 return (error); 576} 577 578static int 579tmpfs_read(struct vop_read_args *v) 580{ 581 struct vnode *vp = v->a_vp; 582 struct uio *uio = v->a_uio; 583 584 struct tmpfs_node *node; 585 vm_object_t uobj; 586 size_t len; 587 int resid; 588 589 int error = 0; 590 591 node = VP_TO_TMPFS_NODE(vp); 592 593 if (vp->v_type != VREG) { 594 error = EISDIR; 595 goto out; 596 } 597 598 if (uio->uio_offset < 0) { 599 error = EINVAL; 600 goto out; 601 } 602 603 node->tn_status |= TMPFS_NODE_ACCESSED; 604 605 uobj = node->tn_reg.tn_aobj; 606 while ((resid = uio->uio_resid) > 0) { 607 error = 0; 608 if (node->tn_size <= uio->uio_offset) 609 break; 610 len = MIN(node->tn_size - uio->uio_offset, resid); 611 if (len == 0) 612 break; 613 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 614 if ((error != 0) || (resid == uio->uio_resid)) 615 break; 616 } 617 618out: 619 620 return error; 621} 622 623/* --------------------------------------------------------------------- */ 624 625static int 626tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 627{ 628 vm_pindex_t idx; 629 vm_page_t vpg, tpg; 630 vm_offset_t offset; 631 off_t addr; 632 size_t tlen; 633 int error; 634 635 error = 0; 636 637 addr = uio->uio_offset; 638 idx = OFF_TO_IDX(addr); 639 offset = addr & PAGE_MASK; 640 tlen = MIN(PAGE_SIZE - offset, len); 641 642 if ((vobj == NULL) || 643 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 644 vpg = NULL; 645 goto nocache; 646 } 647 648 VM_OBJECT_LOCK(vobj); 649lookupvpg: 650 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 651 vm_page_is_valid(vpg, offset, tlen)) { 652 if ((vpg->oflags & VPO_BUSY) != 0) { 653 /* 654 * Reference the page before unlocking and sleeping so 655 * that the page daemon is less likely to reclaim it. 656 */ 657 vm_page_lock_queues(); 658 vm_page_flag_set(vpg, PG_REFERENCED); 659 vm_page_sleep(vpg, "tmfsmw"); 660 goto lookupvpg; 661 } 662 vm_page_busy(vpg); 663 vm_page_undirty(vpg); 664 VM_OBJECT_UNLOCK(vobj); 665 error = uiomove_fromphys(&vpg, offset, tlen, uio); 666 } else { 667 if (__predict_false(vobj->cache != NULL)) 668 vm_page_cache_free(vobj, idx, idx + 1); 669 VM_OBJECT_UNLOCK(vobj); 670 vpg = NULL; 671 } 672nocache: 673 VM_OBJECT_LOCK(tobj); 674 vm_object_pip_add(tobj, 1); 675 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 676 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 677 if (tpg->valid != VM_PAGE_BITS_ALL) { 678 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 679 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 680 if (error != 0) { 681 printf("tmpfs get pages from pager error [write]\n"); 682 goto out; 683 } 684 } else 685 vm_page_zero_invalid(tpg, TRUE); 686 } 687 VM_OBJECT_UNLOCK(tobj); 688 if (vpg == NULL) 689 error = uiomove_fromphys(&tpg, offset, tlen, uio); 690 else { 691 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 692 pmap_copy_page(vpg, tpg); 693 } 694 VM_OBJECT_LOCK(tobj); 695out: 696 if (vobj != NULL) 697 VM_OBJECT_LOCK(vobj); 698 if (error == 0) { 699 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 700 ("parts of tpg invalid")); 701 vm_page_dirty(tpg); 702 } 703 vm_page_lock(tpg); 704 vm_page_unwire(tpg, TRUE); 705 vm_page_unlock(tpg); 706 vm_page_wakeup(tpg); 707 if (vpg != NULL) 708 vm_page_wakeup(vpg); 709 if (vobj != NULL) 710 VM_OBJECT_UNLOCK(vobj); 711 vm_object_pip_subtract(tobj, 1); 712 VM_OBJECT_UNLOCK(tobj); 713 714 return (error); 715} 716 717static int 718tmpfs_write(struct vop_write_args *v) 719{ 720 struct vnode *vp = v->a_vp; 721 struct uio *uio = v->a_uio; 722 int ioflag = v->a_ioflag; 723 724 boolean_t extended; 725 int error = 0; 726 off_t oldsize; 727 struct tmpfs_node *node; 728 vm_object_t uobj; 729 size_t len; 730 int resid; 731 732 node = VP_TO_TMPFS_NODE(vp); 733 oldsize = node->tn_size; 734 735 if (uio->uio_offset < 0 || vp->v_type != VREG) { 736 error = EINVAL; 737 goto out; 738 } 739 740 if (uio->uio_resid == 0) { 741 error = 0; 742 goto out; 743 } 744 745 if (ioflag & IO_APPEND) 746 uio->uio_offset = node->tn_size; 747 748 if (uio->uio_offset + uio->uio_resid > 749 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 750 return (EFBIG); 751 752 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 753 return (EFBIG); 754 755 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 756 if (extended) { 757 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 758 if (error != 0) 759 goto out; 760 } 761 762 uobj = node->tn_reg.tn_aobj; 763 while ((resid = uio->uio_resid) > 0) { 764 if (node->tn_size <= uio->uio_offset) 765 break; 766 len = MIN(node->tn_size - uio->uio_offset, resid); 767 if (len == 0) 768 break; 769 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 770 if ((error != 0) || (resid == uio->uio_resid)) 771 break; 772 } 773 774 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 775 (extended ? TMPFS_NODE_CHANGED : 0); 776 777 if (node->tn_mode & (S_ISUID | S_ISGID)) { 778 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 779 node->tn_mode &= ~(S_ISUID | S_ISGID); 780 } 781 782 if (error != 0) 783 (void)tmpfs_reg_resize(vp, oldsize); 784 785out: 786 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 787 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 788 789 return error; 790} 791 792/* --------------------------------------------------------------------- */ 793 794static int 795tmpfs_fsync(struct vop_fsync_args *v) 796{ 797 struct vnode *vp = v->a_vp; 798 799 MPASS(VOP_ISLOCKED(vp)); 800 801 tmpfs_update(vp); 802 803 return 0; 804} 805 806/* --------------------------------------------------------------------- */ 807 808static int 809tmpfs_remove(struct vop_remove_args *v) 810{ 811 struct vnode *dvp = v->a_dvp; 812 struct vnode *vp = v->a_vp; 813 814 int error; 815 struct tmpfs_dirent *de; 816 struct tmpfs_mount *tmp; 817 struct tmpfs_node *dnode; 818 struct tmpfs_node *node; 819 820 MPASS(VOP_ISLOCKED(dvp)); 821 MPASS(VOP_ISLOCKED(vp)); 822 823 if (vp->v_type == VDIR) { 824 error = EISDIR; 825 goto out; 826 } 827 828 dnode = VP_TO_TMPFS_DIR(dvp); 829 node = VP_TO_TMPFS_NODE(vp); 830 tmp = VFS_TO_TMPFS(vp->v_mount); 831 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 832 MPASS(de != NULL); 833 834 /* Files marked as immutable or append-only cannot be deleted. */ 835 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 836 (dnode->tn_flags & APPEND)) { 837 error = EPERM; 838 goto out; 839 } 840 841 /* Remove the entry from the directory; as it is a file, we do not 842 * have to change the number of hard links of the directory. */ 843 tmpfs_dir_detach(dvp, de); 844 if (v->a_cnp->cn_flags & DOWHITEOUT) 845 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 846 847 /* Free the directory entry we just deleted. Note that the node 848 * referred by it will not be removed until the vnode is really 849 * reclaimed. */ 850 tmpfs_free_dirent(tmp, de, TRUE); 851 852 if (node->tn_links > 0) 853 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 854 TMPFS_NODE_MODIFIED; 855 error = 0; 856 857out: 858 859 return error; 860} 861 862/* --------------------------------------------------------------------- */ 863 864static int 865tmpfs_link(struct vop_link_args *v) 866{ 867 struct vnode *dvp = v->a_tdvp; 868 struct vnode *vp = v->a_vp; 869 struct componentname *cnp = v->a_cnp; 870 871 int error; 872 struct tmpfs_dirent *de; 873 struct tmpfs_node *node; 874 875 MPASS(VOP_ISLOCKED(dvp)); 876 MPASS(cnp->cn_flags & HASBUF); 877 MPASS(dvp != vp); /* XXX When can this be false? */ 878 879 node = VP_TO_TMPFS_NODE(vp); 880 881 /* XXX: Why aren't the following two tests done by the caller? */ 882 883 /* Hard links of directories are forbidden. */ 884 if (vp->v_type == VDIR) { 885 error = EPERM; 886 goto out; 887 } 888 889 /* Cannot create cross-device links. */ 890 if (dvp->v_mount != vp->v_mount) { 891 error = EXDEV; 892 goto out; 893 } 894 895 /* Ensure that we do not overflow the maximum number of links imposed 896 * by the system. */ 897 MPASS(node->tn_links <= LINK_MAX); 898 if (node->tn_links == LINK_MAX) { 899 error = EMLINK; 900 goto out; 901 } 902 903 /* We cannot create links of files marked immutable or append-only. */ 904 if (node->tn_flags & (IMMUTABLE | APPEND)) { 905 error = EPERM; 906 goto out; 907 } 908 909 /* Allocate a new directory entry to represent the node. */ 910 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 911 cnp->cn_nameptr, cnp->cn_namelen, &de); 912 if (error != 0) 913 goto out; 914 915 /* Insert the new directory entry into the appropriate directory. */ 916 if (cnp->cn_flags & ISWHITEOUT) 917 tmpfs_dir_whiteout_remove(dvp, cnp); 918 tmpfs_dir_attach(dvp, de); 919 920 /* vp link count has changed, so update node times. */ 921 node->tn_status |= TMPFS_NODE_CHANGED; 922 tmpfs_update(vp); 923 924 error = 0; 925 926out: 927 return error; 928} 929 930/* --------------------------------------------------------------------- */ 931 932static int 933tmpfs_rename(struct vop_rename_args *v) 934{ 935 struct vnode *fdvp = v->a_fdvp; 936 struct vnode *fvp = v->a_fvp; 937 struct componentname *fcnp = v->a_fcnp; 938 struct vnode *tdvp = v->a_tdvp; 939 struct vnode *tvp = v->a_tvp; 940 struct componentname *tcnp = v->a_tcnp; 941 942 char *newname; 943 int error; 944 struct tmpfs_dirent *de; 945 struct tmpfs_mount *tmp; 946 struct tmpfs_node *fdnode; 947 struct tmpfs_node *fnode; 948 struct tmpfs_node *tnode; 949 struct tmpfs_node *tdnode; 950 951 MPASS(VOP_ISLOCKED(tdvp)); 952 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 953 MPASS(fcnp->cn_flags & HASBUF); 954 MPASS(tcnp->cn_flags & HASBUF); 955 956 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 957 958 /* Disallow cross-device renames. 959 * XXX Why isn't this done by the caller? */ 960 if (fvp->v_mount != tdvp->v_mount || 961 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 962 error = EXDEV; 963 goto out; 964 } 965 966 tmp = VFS_TO_TMPFS(tdvp->v_mount); 967 tdnode = VP_TO_TMPFS_DIR(tdvp); 968 969 /* If source and target are the same file, there is nothing to do. */ 970 if (fvp == tvp) { 971 error = 0; 972 goto out; 973 } 974 975 /* If we need to move the directory between entries, lock the 976 * source so that we can safely operate on it. */ 977 if (tdvp != fdvp) { 978 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 979 if (error != 0) 980 goto out; 981 } 982 fdnode = VP_TO_TMPFS_DIR(fdvp); 983 fnode = VP_TO_TMPFS_NODE(fvp); 984 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 985 986 /* Entry can disappear before we lock fdvp, 987 * also avoid manipulating '.' and '..' entries. */ 988 if (de == NULL) { 989 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 990 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 991 error = EINVAL; 992 else 993 error = ENOENT; 994 goto out_locked; 995 } 996 MPASS(de->td_node == fnode); 997 998 /* If re-naming a directory to another preexisting directory 999 * ensure that the target directory is empty so that its 1000 * removal causes no side effects. 1001 * Kern_rename gurantees the destination to be a directory 1002 * if the source is one. */ 1003 if (tvp != NULL) { 1004 MPASS(tnode != NULL); 1005 1006 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1007 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1008 error = EPERM; 1009 goto out_locked; 1010 } 1011 1012 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1013 if (tnode->tn_size > 0) { 1014 error = ENOTEMPTY; 1015 goto out_locked; 1016 } 1017 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1018 error = ENOTDIR; 1019 goto out_locked; 1020 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1021 error = EISDIR; 1022 goto out_locked; 1023 } else { 1024 MPASS(fnode->tn_type != VDIR && 1025 tnode->tn_type != VDIR); 1026 } 1027 } 1028 1029 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1030 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1031 error = EPERM; 1032 goto out_locked; 1033 } 1034 1035 /* Ensure that we have enough memory to hold the new name, if it 1036 * has to be changed. */ 1037 if (fcnp->cn_namelen != tcnp->cn_namelen || 1038 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1039 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1040 } else 1041 newname = NULL; 1042 1043 /* If the node is being moved to another directory, we have to do 1044 * the move. */ 1045 if (fdnode != tdnode) { 1046 /* In case we are moving a directory, we have to adjust its 1047 * parent to point to the new parent. */ 1048 if (de->td_node->tn_type == VDIR) { 1049 struct tmpfs_node *n; 1050 1051 /* Ensure the target directory is not a child of the 1052 * directory being moved. Otherwise, we'd end up 1053 * with stale nodes. */ 1054 n = tdnode; 1055 /* TMPFS_LOCK garanties that no nodes are freed while 1056 * traversing the list. Nodes can only be marked as 1057 * removed: tn_parent == NULL. */ 1058 TMPFS_LOCK(tmp); 1059 TMPFS_NODE_LOCK(n); 1060 while (n != n->tn_dir.tn_parent) { 1061 struct tmpfs_node *parent; 1062 1063 if (n == fnode) { 1064 TMPFS_NODE_UNLOCK(n); 1065 TMPFS_UNLOCK(tmp); 1066 error = EINVAL; 1067 if (newname != NULL) 1068 free(newname, M_TMPFSNAME); 1069 goto out_locked; 1070 } 1071 parent = n->tn_dir.tn_parent; 1072 TMPFS_NODE_UNLOCK(n); 1073 if (parent == NULL) { 1074 n = NULL; 1075 break; 1076 } 1077 TMPFS_NODE_LOCK(parent); 1078 if (parent->tn_dir.tn_parent == NULL) { 1079 TMPFS_NODE_UNLOCK(parent); 1080 n = NULL; 1081 break; 1082 } 1083 n = parent; 1084 } 1085 TMPFS_UNLOCK(tmp); 1086 if (n == NULL) { 1087 error = EINVAL; 1088 if (newname != NULL) 1089 free(newname, M_TMPFSNAME); 1090 goto out_locked; 1091 } 1092 TMPFS_NODE_UNLOCK(n); 1093 1094 /* Adjust the parent pointer. */ 1095 TMPFS_VALIDATE_DIR(fnode); 1096 TMPFS_NODE_LOCK(de->td_node); 1097 de->td_node->tn_dir.tn_parent = tdnode; 1098 TMPFS_NODE_UNLOCK(de->td_node); 1099 1100 /* As a result of changing the target of the '..' 1101 * entry, the link count of the source and target 1102 * directories has to be adjusted. */ 1103 TMPFS_NODE_LOCK(tdnode); 1104 TMPFS_ASSERT_LOCKED(tdnode); 1105 tdnode->tn_links++; 1106 TMPFS_NODE_UNLOCK(tdnode); 1107 1108 TMPFS_NODE_LOCK(fdnode); 1109 TMPFS_ASSERT_LOCKED(fdnode); 1110 fdnode->tn_links--; 1111 TMPFS_NODE_UNLOCK(fdnode); 1112 } 1113 1114 /* Do the move: just remove the entry from the source directory 1115 * and insert it into the target one. */ 1116 tmpfs_dir_detach(fdvp, de); 1117 if (fcnp->cn_flags & DOWHITEOUT) 1118 tmpfs_dir_whiteout_add(fdvp, fcnp); 1119 if (tcnp->cn_flags & ISWHITEOUT) 1120 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1121 tmpfs_dir_attach(tdvp, de); 1122 } 1123 1124 /* If the name has changed, we need to make it effective by changing 1125 * it in the directory entry. */ 1126 if (newname != NULL) { 1127 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1128 1129 free(de->td_name, M_TMPFSNAME); 1130 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1131 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1132 de->td_name = newname; 1133 1134 fnode->tn_status |= TMPFS_NODE_CHANGED; 1135 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1136 } 1137 1138 /* If we are overwriting an entry, we have to remove the old one 1139 * from the target directory. */ 1140 if (tvp != NULL) { 1141 /* Remove the old entry from the target directory. */ 1142 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1143 tmpfs_dir_detach(tdvp, de); 1144 1145 /* Free the directory entry we just deleted. Note that the 1146 * node referred by it will not be removed until the vnode is 1147 * really reclaimed. */ 1148 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1149 } 1150 1151 error = 0; 1152 1153out_locked: 1154 if (fdnode != tdnode) 1155 VOP_UNLOCK(fdvp, 0); 1156 1157out: 1158 /* Release target nodes. */ 1159 /* XXX: I don't understand when tdvp can be the same as tvp, but 1160 * other code takes care of this... */ 1161 if (tdvp == tvp) 1162 vrele(tdvp); 1163 else 1164 vput(tdvp); 1165 if (tvp != NULL) 1166 vput(tvp); 1167 1168 /* Release source nodes. */ 1169 vrele(fdvp); 1170 vrele(fvp); 1171 1172 return error; 1173} 1174 1175/* --------------------------------------------------------------------- */ 1176 1177static int 1178tmpfs_mkdir(struct vop_mkdir_args *v) 1179{ 1180 struct vnode *dvp = v->a_dvp; 1181 struct vnode **vpp = v->a_vpp; 1182 struct componentname *cnp = v->a_cnp; 1183 struct vattr *vap = v->a_vap; 1184 1185 MPASS(vap->va_type == VDIR); 1186 1187 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1188} 1189 1190/* --------------------------------------------------------------------- */ 1191 1192static int 1193tmpfs_rmdir(struct vop_rmdir_args *v) 1194{ 1195 struct vnode *dvp = v->a_dvp; 1196 struct vnode *vp = v->a_vp; 1197 1198 int error; 1199 struct tmpfs_dirent *de; 1200 struct tmpfs_mount *tmp; 1201 struct tmpfs_node *dnode; 1202 struct tmpfs_node *node; 1203 1204 MPASS(VOP_ISLOCKED(dvp)); 1205 MPASS(VOP_ISLOCKED(vp)); 1206 1207 tmp = VFS_TO_TMPFS(dvp->v_mount); 1208 dnode = VP_TO_TMPFS_DIR(dvp); 1209 node = VP_TO_TMPFS_DIR(vp); 1210 1211 /* Directories with more than two entries ('.' and '..') cannot be 1212 * removed. */ 1213 if (node->tn_size > 0) { 1214 error = ENOTEMPTY; 1215 goto out; 1216 } 1217 1218 if ((dnode->tn_flags & APPEND) 1219 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1220 error = EPERM; 1221 goto out; 1222 } 1223 1224 /* This invariant holds only if we are not trying to remove "..". 1225 * We checked for that above so this is safe now. */ 1226 MPASS(node->tn_dir.tn_parent == dnode); 1227 1228 /* Get the directory entry associated with node (vp). This was 1229 * filled by tmpfs_lookup while looking up the entry. */ 1230 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1231 MPASS(TMPFS_DIRENT_MATCHES(de, 1232 v->a_cnp->cn_nameptr, 1233 v->a_cnp->cn_namelen)); 1234 1235 /* Check flags to see if we are allowed to remove the directory. */ 1236 if (dnode->tn_flags & APPEND 1237 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1238 error = EPERM; 1239 goto out; 1240 } 1241 1242 1243 /* Detach the directory entry from the directory (dnode). */ 1244 tmpfs_dir_detach(dvp, de); 1245 if (v->a_cnp->cn_flags & DOWHITEOUT) 1246 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1247 1248 /* No vnode should be allocated for this entry from this point */ 1249 TMPFS_NODE_LOCK(node); 1250 TMPFS_ASSERT_ELOCKED(node); 1251 node->tn_links--; 1252 node->tn_dir.tn_parent = NULL; 1253 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1254 TMPFS_NODE_MODIFIED; 1255 1256 TMPFS_NODE_UNLOCK(node); 1257 1258 TMPFS_NODE_LOCK(dnode); 1259 TMPFS_ASSERT_ELOCKED(dnode); 1260 dnode->tn_links--; 1261 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1262 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1263 TMPFS_NODE_UNLOCK(dnode); 1264 1265 cache_purge(dvp); 1266 cache_purge(vp); 1267 1268 /* Free the directory entry we just deleted. Note that the node 1269 * referred by it will not be removed until the vnode is really 1270 * reclaimed. */ 1271 tmpfs_free_dirent(tmp, de, TRUE); 1272 1273 /* Release the deleted vnode (will destroy the node, notify 1274 * interested parties and clean it from the cache). */ 1275 1276 dnode->tn_status |= TMPFS_NODE_CHANGED; 1277 tmpfs_update(dvp); 1278 1279 error = 0; 1280 1281out: 1282 return error; 1283} 1284 1285/* --------------------------------------------------------------------- */ 1286 1287static int 1288tmpfs_symlink(struct vop_symlink_args *v) 1289{ 1290 struct vnode *dvp = v->a_dvp; 1291 struct vnode **vpp = v->a_vpp; 1292 struct componentname *cnp = v->a_cnp; 1293 struct vattr *vap = v->a_vap; 1294 char *target = v->a_target; 1295 1296#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1297 MPASS(vap->va_type == VLNK); 1298#else 1299 vap->va_type = VLNK; 1300#endif 1301 1302 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1303} 1304 1305/* --------------------------------------------------------------------- */ 1306 1307static int 1308tmpfs_readdir(struct vop_readdir_args *v) 1309{ 1310 struct vnode *vp = v->a_vp; 1311 struct uio *uio = v->a_uio; 1312 int *eofflag = v->a_eofflag; 1313 u_long **cookies = v->a_cookies; 1314 int *ncookies = v->a_ncookies; 1315 1316 int error; 1317 off_t startoff; 1318 off_t cnt = 0; 1319 struct tmpfs_node *node; 1320 1321 /* This operation only makes sense on directory nodes. */ 1322 if (vp->v_type != VDIR) 1323 return ENOTDIR; 1324 1325 node = VP_TO_TMPFS_DIR(vp); 1326 1327 startoff = uio->uio_offset; 1328 1329 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1330 error = tmpfs_dir_getdotdent(node, uio); 1331 if (error != 0) 1332 goto outok; 1333 cnt++; 1334 } 1335 1336 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1337 error = tmpfs_dir_getdotdotdent(node, uio); 1338 if (error != 0) 1339 goto outok; 1340 cnt++; 1341 } 1342 1343 error = tmpfs_dir_getdents(node, uio, &cnt); 1344 1345outok: 1346 MPASS(error >= -1); 1347 1348 if (error == -1) 1349 error = 0; 1350 1351 if (eofflag != NULL) 1352 *eofflag = 1353 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1354 1355 /* Update NFS-related variables. */ 1356 if (error == 0 && cookies != NULL && ncookies != NULL) { 1357 off_t i; 1358 off_t off = startoff; 1359 struct tmpfs_dirent *de = NULL; 1360 1361 *ncookies = cnt; 1362 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1363 1364 for (i = 0; i < cnt; i++) { 1365 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1366 if (off == TMPFS_DIRCOOKIE_DOT) { 1367 off = TMPFS_DIRCOOKIE_DOTDOT; 1368 } else { 1369 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1370 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1371 } else if (de != NULL) { 1372 de = TAILQ_NEXT(de, td_entries); 1373 } else { 1374 de = tmpfs_dir_lookupbycookie(node, 1375 off); 1376 MPASS(de != NULL); 1377 de = TAILQ_NEXT(de, td_entries); 1378 } 1379 if (de == NULL) 1380 off = TMPFS_DIRCOOKIE_EOF; 1381 else 1382 off = tmpfs_dircookie(de); 1383 } 1384 1385 (*cookies)[i] = off; 1386 } 1387 MPASS(uio->uio_offset == off); 1388 } 1389 1390 return error; 1391} 1392 1393/* --------------------------------------------------------------------- */ 1394 1395static int 1396tmpfs_readlink(struct vop_readlink_args *v) 1397{ 1398 struct vnode *vp = v->a_vp; 1399 struct uio *uio = v->a_uio; 1400 1401 int error; 1402 struct tmpfs_node *node; 1403 1404 MPASS(uio->uio_offset == 0); 1405 MPASS(vp->v_type == VLNK); 1406 1407 node = VP_TO_TMPFS_NODE(vp); 1408 1409 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1410 uio); 1411 node->tn_status |= TMPFS_NODE_ACCESSED; 1412 1413 return error; 1414} 1415 1416/* --------------------------------------------------------------------- */ 1417 1418static int 1419tmpfs_inactive(struct vop_inactive_args *v) 1420{ 1421 struct vnode *vp = v->a_vp; 1422 struct thread *l = v->a_td; 1423 1424 struct tmpfs_node *node; 1425 1426 MPASS(VOP_ISLOCKED(vp)); 1427 1428 node = VP_TO_TMPFS_NODE(vp); 1429 1430 if (node->tn_links == 0) 1431 vrecycle(vp, l); 1432 1433 return 0; 1434} 1435 1436/* --------------------------------------------------------------------- */ 1437 1438int 1439tmpfs_reclaim(struct vop_reclaim_args *v) 1440{ 1441 struct vnode *vp = v->a_vp; 1442 1443 struct tmpfs_mount *tmp; 1444 struct tmpfs_node *node; 1445 1446 node = VP_TO_TMPFS_NODE(vp); 1447 tmp = VFS_TO_TMPFS(vp->v_mount); 1448 1449 vnode_destroy_vobject(vp); 1450 cache_purge(vp); 1451 1452 TMPFS_NODE_LOCK(node); 1453 TMPFS_ASSERT_ELOCKED(node); 1454 tmpfs_free_vp(vp); 1455 1456 /* If the node referenced by this vnode was deleted by the user, 1457 * we must free its associated data structures (now that the vnode 1458 * is being reclaimed). */ 1459 if (node->tn_links == 0 && 1460 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1461 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1462 TMPFS_NODE_UNLOCK(node); 1463 tmpfs_free_node(tmp, node); 1464 } else 1465 TMPFS_NODE_UNLOCK(node); 1466 1467 MPASS(vp->v_data == NULL); 1468 return 0; 1469} 1470 1471/* --------------------------------------------------------------------- */ 1472 1473static int 1474tmpfs_print(struct vop_print_args *v) 1475{ 1476 struct vnode *vp = v->a_vp; 1477 1478 struct tmpfs_node *node; 1479 1480 node = VP_TO_TMPFS_NODE(vp); 1481 1482 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1483 node, node->tn_flags, node->tn_links); 1484 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1485 ", status 0x%x\n", 1486 node->tn_mode, node->tn_uid, node->tn_gid, 1487 (uintmax_t)node->tn_size, node->tn_status); 1488 1489 if (vp->v_type == VFIFO) 1490 fifo_printinfo(vp); 1491 1492 printf("\n"); 1493 1494 return 0; 1495} 1496 1497/* --------------------------------------------------------------------- */ 1498 1499static int 1500tmpfs_pathconf(struct vop_pathconf_args *v) 1501{ 1502 int name = v->a_name; 1503 register_t *retval = v->a_retval; 1504 1505 int error; 1506 1507 error = 0; 1508 1509 switch (name) { 1510 case _PC_LINK_MAX: 1511 *retval = LINK_MAX; 1512 break; 1513 1514 case _PC_NAME_MAX: 1515 *retval = NAME_MAX; 1516 break; 1517 1518 case _PC_PATH_MAX: 1519 *retval = PATH_MAX; 1520 break; 1521 1522 case _PC_PIPE_BUF: 1523 *retval = PIPE_BUF; 1524 break; 1525 1526 case _PC_CHOWN_RESTRICTED: 1527 *retval = 1; 1528 break; 1529 1530 case _PC_NO_TRUNC: 1531 *retval = 1; 1532 break; 1533 1534 case _PC_SYNC_IO: 1535 *retval = 1; 1536 break; 1537 1538 case _PC_FILESIZEBITS: 1539 *retval = 0; /* XXX Don't know which value should I return. */ 1540 break; 1541 1542 default: 1543 error = EINVAL; 1544 } 1545 1546 return error; 1547} 1548 1549static int 1550tmpfs_vptofh(struct vop_vptofh_args *ap) 1551{ 1552 struct tmpfs_fid *tfhp; 1553 struct tmpfs_node *node; 1554 1555 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1556 node = VP_TO_TMPFS_NODE(ap->a_vp); 1557 1558 tfhp->tf_len = sizeof(struct tmpfs_fid); 1559 tfhp->tf_id = node->tn_id; 1560 tfhp->tf_gen = node->tn_gen; 1561 1562 return (0); 1563} 1564 1565static int 1566tmpfs_whiteout(struct vop_whiteout_args *ap) 1567{ 1568 struct vnode *dvp = ap->a_dvp; 1569 struct componentname *cnp = ap->a_cnp; 1570 struct tmpfs_dirent *de; 1571 1572 switch (ap->a_flags) { 1573 case LOOKUP: 1574 return (0); 1575 case CREATE: 1576 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1577 if (de != NULL) 1578 return (de->td_node == NULL ? 0 : EEXIST); 1579 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1580 case DELETE: 1581 tmpfs_dir_whiteout_remove(dvp, cnp); 1582 return (0); 1583 default: 1584 panic("tmpfs_whiteout: unknown op"); 1585 } 1586} 1587 1588/* --------------------------------------------------------------------- */ 1589 1590/* 1591 * vnode operations vector used for files stored in a tmpfs file system. 1592 */ 1593struct vop_vector tmpfs_vnodeop_entries = { 1594 .vop_default = &default_vnodeops, 1595 .vop_lookup = vfs_cache_lookup, 1596 .vop_cachedlookup = tmpfs_lookup, 1597 .vop_create = tmpfs_create, 1598 .vop_mknod = tmpfs_mknod, 1599 .vop_open = tmpfs_open, 1600 .vop_close = tmpfs_close, 1601 .vop_access = tmpfs_access, 1602 .vop_getattr = tmpfs_getattr, 1603 .vop_setattr = tmpfs_setattr, 1604 .vop_read = tmpfs_read, 1605 .vop_write = tmpfs_write, 1606 .vop_fsync = tmpfs_fsync, 1607 .vop_remove = tmpfs_remove, 1608 .vop_link = tmpfs_link, 1609 .vop_rename = tmpfs_rename, 1610 .vop_mkdir = tmpfs_mkdir, 1611 .vop_rmdir = tmpfs_rmdir, 1612 .vop_symlink = tmpfs_symlink, 1613 .vop_readdir = tmpfs_readdir, 1614 .vop_readlink = tmpfs_readlink, 1615 .vop_inactive = tmpfs_inactive, 1616 .vop_reclaim = tmpfs_reclaim, 1617 .vop_print = tmpfs_print, 1618 .vop_pathconf = tmpfs_pathconf, 1619 .vop_vptofh = tmpfs_vptofh, 1620 .vop_whiteout = tmpfs_whiteout, 1621 .vop_bmap = VOP_EOPNOTSUPP, 1622}; 1623 1624