tmpfs_vnops.c revision 239065
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 239065 2012-08-05 14:11:42Z kib $"); 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/sysctl.h> 50#include <sys/unistd.h> 51#include <sys/vnode.h> 52 53#include <vm/vm.h> 54#include <vm/vm_param.h> 55#include <vm/vm_object.h> 56#include <vm/vm_page.h> 57#include <vm/vm_pager.h> 58 59#include <fs/tmpfs/tmpfs_vnops.h> 60#include <fs/tmpfs/tmpfs.h> 61 62SYSCTL_DECL(_vfs_tmpfs); 63 64static volatile int tmpfs_rename_restarts; 65SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 66 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 67 "Times rename had to restart due to lock contention"); 68 69/* --------------------------------------------------------------------- */ 70 71static int 72tmpfs_lookup(struct vop_cachedlookup_args *v) 73{ 74 struct vnode *dvp = v->a_dvp; 75 struct vnode **vpp = v->a_vpp; 76 struct componentname *cnp = v->a_cnp; 77 78 int error; 79 struct tmpfs_dirent *de; 80 struct tmpfs_node *dnode; 81 82 dnode = VP_TO_TMPFS_DIR(dvp); 83 *vpp = NULLVP; 84 85 /* Check accessibility of requested node as a first step. */ 86 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 87 if (error != 0) 88 goto out; 89 90 /* We cannot be requesting the parent directory of the root node. */ 91 MPASS(IMPLIES(dnode->tn_type == VDIR && 92 dnode->tn_dir.tn_parent == dnode, 93 !(cnp->cn_flags & ISDOTDOT))); 94 95 TMPFS_ASSERT_LOCKED(dnode); 96 if (dnode->tn_dir.tn_parent == NULL) { 97 error = ENOENT; 98 goto out; 99 } 100 if (cnp->cn_flags & ISDOTDOT) { 101 int ltype = 0; 102 103 ltype = VOP_ISLOCKED(dvp); 104 vhold(dvp); 105 VOP_UNLOCK(dvp, 0); 106 /* Allocate a new vnode on the matching entry. */ 107 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 108 cnp->cn_lkflags, vpp); 109 110 vn_lock(dvp, ltype | LK_RETRY); 111 vdrop(dvp); 112 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 113 VREF(dvp); 114 *vpp = dvp; 115 error = 0; 116 } else { 117 de = tmpfs_dir_lookup(dnode, NULL, cnp); 118 if (de != NULL && de->td_node == NULL) 119 cnp->cn_flags |= ISWHITEOUT; 120 if (de == NULL || de->td_node == NULL) { 121 /* The entry was not found in the directory. 122 * This is OK if we are creating or renaming an 123 * entry and are working on the last component of 124 * the path name. */ 125 if ((cnp->cn_flags & ISLASTCN) && 126 (cnp->cn_nameiop == CREATE || \ 127 cnp->cn_nameiop == RENAME || 128 (cnp->cn_nameiop == DELETE && 129 cnp->cn_flags & DOWHITEOUT && 130 cnp->cn_flags & ISWHITEOUT))) { 131 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 132 cnp->cn_thread); 133 if (error != 0) 134 goto out; 135 136 /* Keep the component name in the buffer for 137 * future uses. */ 138 cnp->cn_flags |= SAVENAME; 139 140 error = EJUSTRETURN; 141 } else 142 error = ENOENT; 143 } else { 144 struct tmpfs_node *tnode; 145 146 /* The entry was found, so get its associated 147 * tmpfs_node. */ 148 tnode = de->td_node; 149 150 /* If we are not at the last path component and 151 * found a non-directory or non-link entry (which 152 * may itself be pointing to a directory), raise 153 * an error. */ 154 if ((tnode->tn_type != VDIR && 155 tnode->tn_type != VLNK) && 156 !(cnp->cn_flags & ISLASTCN)) { 157 error = ENOTDIR; 158 goto out; 159 } 160 161 /* If we are deleting or renaming the entry, keep 162 * track of its tmpfs_dirent so that it can be 163 * easily deleted later. */ 164 if ((cnp->cn_flags & ISLASTCN) && 165 (cnp->cn_nameiop == DELETE || 166 cnp->cn_nameiop == RENAME)) { 167 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 168 cnp->cn_thread); 169 if (error != 0) 170 goto out; 171 172 /* Allocate a new vnode on the matching entry. */ 173 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 174 cnp->cn_lkflags, vpp); 175 if (error != 0) 176 goto out; 177 178 if ((dnode->tn_mode & S_ISTXT) && 179 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 180 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 181 error = EPERM; 182 vput(*vpp); 183 *vpp = NULL; 184 goto out; 185 } 186 cnp->cn_flags |= SAVENAME; 187 } else { 188 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 189 cnp->cn_lkflags, vpp); 190 } 191 } 192 } 193 194 /* Store the result of this lookup in the cache. Avoid this if the 195 * request was for creation, as it does not improve timings on 196 * emprical tests. */ 197 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 198 cache_enter(dvp, *vpp, cnp); 199 200out: 201 /* If there were no errors, *vpp cannot be null and it must be 202 * locked. */ 203 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 204 205 return error; 206} 207 208/* --------------------------------------------------------------------- */ 209 210static int 211tmpfs_create(struct vop_create_args *v) 212{ 213 struct vnode *dvp = v->a_dvp; 214 struct vnode **vpp = v->a_vpp; 215 struct componentname *cnp = v->a_cnp; 216 struct vattr *vap = v->a_vap; 217 218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 219 220 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 221} 222/* --------------------------------------------------------------------- */ 223 224static int 225tmpfs_mknod(struct vop_mknod_args *v) 226{ 227 struct vnode *dvp = v->a_dvp; 228 struct vnode **vpp = v->a_vpp; 229 struct componentname *cnp = v->a_cnp; 230 struct vattr *vap = v->a_vap; 231 232 if (vap->va_type != VBLK && vap->va_type != VCHR && 233 vap->va_type != VFIFO) 234 return EINVAL; 235 236 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 237} 238 239/* --------------------------------------------------------------------- */ 240 241static int 242tmpfs_open(struct vop_open_args *v) 243{ 244 struct vnode *vp = v->a_vp; 245 int mode = v->a_mode; 246 247 int error; 248 struct tmpfs_node *node; 249 250 MPASS(VOP_ISLOCKED(vp)); 251 252 node = VP_TO_TMPFS_NODE(vp); 253 254 /* The file is still active but all its names have been removed 255 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 256 * it is about to die. */ 257 if (node->tn_links < 1) 258 return (ENOENT); 259 260 /* If the file is marked append-only, deny write requests. */ 261 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 262 error = EPERM; 263 else { 264 error = 0; 265 vnode_create_vobject(vp, node->tn_size, v->a_td); 266 } 267 268 MPASS(VOP_ISLOCKED(vp)); 269 return error; 270} 271 272/* --------------------------------------------------------------------- */ 273 274static int 275tmpfs_close(struct vop_close_args *v) 276{ 277 struct vnode *vp = v->a_vp; 278 279 MPASS(VOP_ISLOCKED(vp)); 280 281 /* Update node times. */ 282 tmpfs_update(vp); 283 284 return (0); 285} 286 287/* --------------------------------------------------------------------- */ 288 289int 290tmpfs_access(struct vop_access_args *v) 291{ 292 struct vnode *vp = v->a_vp; 293 accmode_t accmode = v->a_accmode; 294 struct ucred *cred = v->a_cred; 295 296 int error; 297 struct tmpfs_node *node; 298 299 MPASS(VOP_ISLOCKED(vp)); 300 301 node = VP_TO_TMPFS_NODE(vp); 302 303 switch (vp->v_type) { 304 case VDIR: 305 /* FALLTHROUGH */ 306 case VLNK: 307 /* FALLTHROUGH */ 308 case VREG: 309 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 310 error = EROFS; 311 goto out; 312 } 313 break; 314 315 case VBLK: 316 /* FALLTHROUGH */ 317 case VCHR: 318 /* FALLTHROUGH */ 319 case VSOCK: 320 /* FALLTHROUGH */ 321 case VFIFO: 322 break; 323 324 default: 325 error = EINVAL; 326 goto out; 327 } 328 329 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 330 error = EPERM; 331 goto out; 332 } 333 334 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 335 node->tn_gid, accmode, cred, NULL); 336 337out: 338 MPASS(VOP_ISLOCKED(vp)); 339 340 return error; 341} 342 343/* --------------------------------------------------------------------- */ 344 345int 346tmpfs_getattr(struct vop_getattr_args *v) 347{ 348 struct vnode *vp = v->a_vp; 349 struct vattr *vap = v->a_vap; 350 351 struct tmpfs_node *node; 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 tmpfs_update(vp); 356 357 vap->va_type = vp->v_type; 358 vap->va_mode = node->tn_mode; 359 vap->va_nlink = node->tn_links; 360 vap->va_uid = node->tn_uid; 361 vap->va_gid = node->tn_gid; 362 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 363 vap->va_fileid = node->tn_id; 364 vap->va_size = node->tn_size; 365 vap->va_blocksize = PAGE_SIZE; 366 vap->va_atime = node->tn_atime; 367 vap->va_mtime = node->tn_mtime; 368 vap->va_ctime = node->tn_ctime; 369 vap->va_birthtime = node->tn_birthtime; 370 vap->va_gen = node->tn_gen; 371 vap->va_flags = node->tn_flags; 372 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 373 node->tn_rdev : NODEV; 374 vap->va_bytes = round_page(node->tn_size); 375 vap->va_filerev = 0; 376 377 return 0; 378} 379 380/* --------------------------------------------------------------------- */ 381 382/* XXX Should this operation be atomic? I think it should, but code in 383 * XXX other places (e.g., ufs) doesn't seem to be... */ 384int 385tmpfs_setattr(struct vop_setattr_args *v) 386{ 387 struct vnode *vp = v->a_vp; 388 struct vattr *vap = v->a_vap; 389 struct ucred *cred = v->a_cred; 390 struct thread *td = curthread; 391 392 int error; 393 394 MPASS(VOP_ISLOCKED(vp)); 395 396 error = 0; 397 398 /* Abort if any unsettable attribute is given. */ 399 if (vap->va_type != VNON || 400 vap->va_nlink != VNOVAL || 401 vap->va_fsid != VNOVAL || 402 vap->va_fileid != VNOVAL || 403 vap->va_blocksize != VNOVAL || 404 vap->va_gen != VNOVAL || 405 vap->va_rdev != VNOVAL || 406 vap->va_bytes != VNOVAL) 407 error = EINVAL; 408 409 if (error == 0 && (vap->va_flags != VNOVAL)) 410 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 411 412 if (error == 0 && (vap->va_size != VNOVAL)) 413 error = tmpfs_chsize(vp, vap->va_size, cred, td); 414 415 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 416 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 417 418 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 419 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 420 421 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 422 vap->va_atime.tv_nsec != VNOVAL) || 423 (vap->va_mtime.tv_sec != VNOVAL && 424 vap->va_mtime.tv_nsec != VNOVAL) || 425 (vap->va_birthtime.tv_sec != VNOVAL && 426 vap->va_birthtime.tv_nsec != VNOVAL))) 427 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 428 &vap->va_birthtime, vap->va_vaflags, cred, td); 429 430 /* Update the node times. We give preference to the error codes 431 * generated by this function rather than the ones that may arise 432 * from tmpfs_update. */ 433 tmpfs_update(vp); 434 435 MPASS(VOP_ISLOCKED(vp)); 436 437 return error; 438} 439 440/* --------------------------------------------------------------------- */ 441static int 442tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 443 vm_offset_t offset, size_t tlen, struct uio *uio) 444{ 445 vm_page_t m; 446 int error, rv; 447 448 VM_OBJECT_LOCK(tobj); 449 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 450 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 451 if (m->valid != VM_PAGE_BITS_ALL) { 452 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 453 rv = vm_pager_get_pages(tobj, &m, 1, 0); 454 if (rv != VM_PAGER_OK) { 455 vm_page_lock(m); 456 vm_page_free(m); 457 vm_page_unlock(m); 458 VM_OBJECT_UNLOCK(tobj); 459 return (EIO); 460 } 461 } else 462 vm_page_zero_invalid(m, TRUE); 463 } 464 VM_OBJECT_UNLOCK(tobj); 465 error = uiomove_fromphys(&m, offset, tlen, uio); 466 VM_OBJECT_LOCK(tobj); 467 vm_page_lock(m); 468 vm_page_unwire(m, TRUE); 469 vm_page_unlock(m); 470 vm_page_wakeup(m); 471 VM_OBJECT_UNLOCK(tobj); 472 473 return (error); 474} 475 476static __inline int 477tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 478 vm_offset_t offset, size_t tlen, void *buf) 479{ 480 struct uio uio; 481 struct iovec iov; 482 483 uio.uio_iovcnt = 1; 484 uio.uio_iov = &iov; 485 iov.iov_base = buf; 486 iov.iov_len = tlen; 487 488 uio.uio_offset = 0; 489 uio.uio_resid = tlen; 490 uio.uio_rw = UIO_READ; 491 uio.uio_segflg = UIO_SYSSPACE; 492 uio.uio_td = curthread; 493 494 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 495} 496 497static int 498tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 499{ 500 struct sf_buf *sf; 501 vm_pindex_t idx; 502 vm_page_t m; 503 vm_offset_t offset; 504 off_t addr; 505 size_t tlen; 506 char *ma; 507 int error; 508 509 addr = uio->uio_offset; 510 idx = OFF_TO_IDX(addr); 511 offset = addr & PAGE_MASK; 512 tlen = MIN(PAGE_SIZE - offset, len); 513 514 if ((vobj == NULL) || 515 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 516 goto nocache; 517 518 VM_OBJECT_LOCK(vobj); 519lookupvpg: 520 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 521 vm_page_is_valid(m, offset, tlen)) { 522 if ((m->oflags & VPO_BUSY) != 0) { 523 /* 524 * Reference the page before unlocking and sleeping so 525 * that the page daemon is less likely to reclaim it. 526 */ 527 vm_page_reference(m); 528 vm_page_sleep(m, "tmfsmr"); 529 goto lookupvpg; 530 } 531 vm_page_busy(m); 532 VM_OBJECT_UNLOCK(vobj); 533 error = uiomove_fromphys(&m, offset, tlen, uio); 534 VM_OBJECT_LOCK(vobj); 535 vm_page_wakeup(m); 536 VM_OBJECT_UNLOCK(vobj); 537 return (error); 538 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 539 KASSERT(offset == 0, 540 ("unexpected offset in tmpfs_mappedread for sendfile")); 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_reference(m); 547 vm_page_sleep(m, "tmfsmr"); 548 goto lookupvpg; 549 } 550 vm_page_busy(m); 551 VM_OBJECT_UNLOCK(vobj); 552 sched_pin(); 553 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 554 ma = (char *)sf_buf_kva(sf); 555 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 556 if (error == 0) { 557 if (tlen != PAGE_SIZE) 558 bzero(ma + tlen, PAGE_SIZE - tlen); 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 m->valid = VM_PAGE_BITS_ALL; 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, rv; 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_reference(vpg); 658 vm_page_sleep(vpg, "tmfsmw"); 659 goto lookupvpg; 660 } 661 vm_page_busy(vpg); 662 vm_page_undirty(vpg); 663 VM_OBJECT_UNLOCK(vobj); 664 error = uiomove_fromphys(&vpg, offset, tlen, uio); 665 } else { 666 if (vm_page_is_cached(vobj, idx)) 667 vm_page_cache_free(vobj, idx, idx + 1); 668 VM_OBJECT_UNLOCK(vobj); 669 vpg = NULL; 670 } 671nocache: 672 VM_OBJECT_LOCK(tobj); 673 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 674 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 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 678 if (rv != VM_PAGER_OK) { 679 vm_page_lock(tpg); 680 vm_page_free(tpg); 681 vm_page_unlock(tpg); 682 error = EIO; 683 goto out; 684 } 685 } else 686 vm_page_zero_invalid(tpg, TRUE); 687 } 688 VM_OBJECT_UNLOCK(tobj); 689 if (vpg == NULL) 690 error = uiomove_fromphys(&tpg, offset, tlen, uio); 691 else { 692 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 693 pmap_copy_page(vpg, tpg); 694 } 695 VM_OBJECT_LOCK(tobj); 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); 705out: 706 VM_OBJECT_UNLOCK(tobj); 707 if (vpg != NULL) { 708 VM_OBJECT_LOCK(vobj); 709 vm_page_wakeup(vpg); 710 VM_OBJECT_UNLOCK(vobj); 711 } 712 713 return (error); 714} 715 716static int 717tmpfs_write(struct vop_write_args *v) 718{ 719 struct vnode *vp = v->a_vp; 720 struct uio *uio = v->a_uio; 721 int ioflag = v->a_ioflag; 722 723 boolean_t extended; 724 int error = 0; 725 off_t oldsize; 726 struct tmpfs_node *node; 727 vm_object_t uobj; 728 size_t len; 729 int resid; 730 731 node = VP_TO_TMPFS_NODE(vp); 732 oldsize = node->tn_size; 733 734 if (uio->uio_offset < 0 || vp->v_type != VREG) { 735 error = EINVAL; 736 goto out; 737 } 738 739 if (uio->uio_resid == 0) { 740 error = 0; 741 goto out; 742 } 743 744 if (ioflag & IO_APPEND) 745 uio->uio_offset = node->tn_size; 746 747 if (uio->uio_offset + uio->uio_resid > 748 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 749 return (EFBIG); 750 751 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 752 return (EFBIG); 753 754 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 755 if (extended) { 756 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 757 FALSE); 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, TRUE); 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 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 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/* --------------------------------------------------------------------- */ 929 930/* 931 * We acquire all but fdvp locks using non-blocking acquisitions. If we 932 * fail to acquire any lock in the path we will drop all held locks, 933 * acquire the new lock in a blocking fashion, and then release it and 934 * restart the rename. This acquire/release step ensures that we do not 935 * spin on a lock waiting for release. On error release all vnode locks 936 * and decrement references the way tmpfs_rename() would do. 937 */ 938static int 939tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 940 struct vnode *tdvp, struct vnode **tvpp, 941 struct componentname *fcnp, struct componentname *tcnp) 942{ 943 struct vnode *nvp; 944 struct mount *mp; 945 struct tmpfs_dirent *de; 946 int error, restarts = 0; 947 948 VOP_UNLOCK(tdvp, 0); 949 if (*tvpp != NULL && *tvpp != tdvp) 950 VOP_UNLOCK(*tvpp, 0); 951 mp = fdvp->v_mount; 952 953relock: 954 restarts += 1; 955 error = vn_lock(fdvp, LK_EXCLUSIVE); 956 if (error) 957 goto releout; 958 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 959 VOP_UNLOCK(fdvp, 0); 960 error = vn_lock(tdvp, LK_EXCLUSIVE); 961 if (error) 962 goto releout; 963 VOP_UNLOCK(tdvp, 0); 964 goto relock; 965 } 966 /* 967 * Re-resolve fvp to be certain it still exists and fetch the 968 * correct vnode. 969 */ 970 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 971 if (de == NULL) { 972 VOP_UNLOCK(fdvp, 0); 973 VOP_UNLOCK(tdvp, 0); 974 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 975 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 976 error = EINVAL; 977 else 978 error = ENOENT; 979 goto releout; 980 } 981 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 982 if (error != 0) { 983 VOP_UNLOCK(fdvp, 0); 984 VOP_UNLOCK(tdvp, 0); 985 if (error != EBUSY) 986 goto releout; 987 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 988 if (error != 0) 989 goto releout; 990 VOP_UNLOCK(nvp, 0); 991 /* 992 * Concurrent rename race. 993 */ 994 if (nvp == tdvp) { 995 vrele(nvp); 996 error = EINVAL; 997 goto releout; 998 } 999 vrele(*fvpp); 1000 *fvpp = nvp; 1001 goto relock; 1002 } 1003 vrele(*fvpp); 1004 *fvpp = nvp; 1005 VOP_UNLOCK(*fvpp, 0); 1006 /* 1007 * Re-resolve tvp and acquire the vnode lock if present. 1008 */ 1009 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 1010 /* 1011 * If tvp disappeared we just carry on. 1012 */ 1013 if (de == NULL && *tvpp != NULL) { 1014 vrele(*tvpp); 1015 *tvpp = NULL; 1016 } 1017 /* 1018 * Get the tvp ino if the lookup succeeded. We may have to restart 1019 * if the non-blocking acquire fails. 1020 */ 1021 if (de != NULL) { 1022 nvp = NULL; 1023 error = tmpfs_alloc_vp(mp, de->td_node, 1024 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 1025 if (*tvpp != NULL) 1026 vrele(*tvpp); 1027 *tvpp = nvp; 1028 if (error != 0) { 1029 VOP_UNLOCK(fdvp, 0); 1030 VOP_UNLOCK(tdvp, 0); 1031 if (error != EBUSY) 1032 goto releout; 1033 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 1034 &nvp); 1035 if (error != 0) 1036 goto releout; 1037 VOP_UNLOCK(nvp, 0); 1038 /* 1039 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 1040 */ 1041 if (nvp == fdvp) { 1042 error = ENOTEMPTY; 1043 goto releout; 1044 } 1045 goto relock; 1046 } 1047 } 1048 tmpfs_rename_restarts += restarts; 1049 1050 return (0); 1051 1052releout: 1053 vrele(fdvp); 1054 vrele(*fvpp); 1055 vrele(tdvp); 1056 if (*tvpp != NULL) 1057 vrele(*tvpp); 1058 tmpfs_rename_restarts += restarts; 1059 1060 return (error); 1061} 1062 1063static int 1064tmpfs_rename(struct vop_rename_args *v) 1065{ 1066 struct vnode *fdvp = v->a_fdvp; 1067 struct vnode *fvp = v->a_fvp; 1068 struct componentname *fcnp = v->a_fcnp; 1069 struct vnode *tdvp = v->a_tdvp; 1070 struct vnode *tvp = v->a_tvp; 1071 struct componentname *tcnp = v->a_tcnp; 1072 struct mount *mp = NULL; 1073 1074 char *newname; 1075 int error; 1076 struct tmpfs_dirent *de; 1077 struct tmpfs_mount *tmp; 1078 struct tmpfs_node *fdnode; 1079 struct tmpfs_node *fnode; 1080 struct tmpfs_node *tnode; 1081 struct tmpfs_node *tdnode; 1082 1083 MPASS(VOP_ISLOCKED(tdvp)); 1084 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 1085 MPASS(fcnp->cn_flags & HASBUF); 1086 MPASS(tcnp->cn_flags & HASBUF); 1087 1088 /* Disallow cross-device renames. 1089 * XXX Why isn't this done by the caller? */ 1090 if (fvp->v_mount != tdvp->v_mount || 1091 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1092 error = EXDEV; 1093 goto out; 1094 } 1095 1096 /* If source and target are the same file, there is nothing to do. */ 1097 if (fvp == tvp) { 1098 error = 0; 1099 goto out; 1100 } 1101 1102 /* If we need to move the directory between entries, lock the 1103 * source so that we can safely operate on it. */ 1104 if (fdvp != tdvp && fdvp != tvp) { 1105 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1106 mp = tdvp->v_mount; 1107 error = vfs_busy(mp, 0); 1108 if (error != 0) { 1109 mp = NULL; 1110 goto out; 1111 } 1112 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1113 fcnp, tcnp); 1114 if (error != 0) { 1115 vfs_unbusy(mp); 1116 return (error); 1117 } 1118 ASSERT_VOP_ELOCKED(fdvp, 1119 "tmpfs_rename: fdvp not locked"); 1120 ASSERT_VOP_ELOCKED(tdvp, 1121 "tmpfs_rename: tdvp not locked"); 1122 if (tvp != NULL) 1123 ASSERT_VOP_ELOCKED(tvp, 1124 "tmpfs_rename: tvp not locked"); 1125 if (fvp == tvp) { 1126 error = 0; 1127 goto out_locked; 1128 } 1129 } 1130 } 1131 1132 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1133 tdnode = VP_TO_TMPFS_DIR(tdvp); 1134 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1135 fdnode = VP_TO_TMPFS_DIR(fdvp); 1136 fnode = VP_TO_TMPFS_NODE(fvp); 1137 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1138 1139 /* Entry can disappear before we lock fdvp, 1140 * also avoid manipulating '.' and '..' entries. */ 1141 if (de == NULL) { 1142 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1143 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1144 error = EINVAL; 1145 else 1146 error = ENOENT; 1147 goto out_locked; 1148 } 1149 MPASS(de->td_node == fnode); 1150 1151 /* If re-naming a directory to another preexisting directory 1152 * ensure that the target directory is empty so that its 1153 * removal causes no side effects. 1154 * Kern_rename gurantees the destination to be a directory 1155 * if the source is one. */ 1156 if (tvp != NULL) { 1157 MPASS(tnode != NULL); 1158 1159 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1160 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1161 error = EPERM; 1162 goto out_locked; 1163 } 1164 1165 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1166 if (tnode->tn_size > 0) { 1167 error = ENOTEMPTY; 1168 goto out_locked; 1169 } 1170 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1171 error = ENOTDIR; 1172 goto out_locked; 1173 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1174 error = EISDIR; 1175 goto out_locked; 1176 } else { 1177 MPASS(fnode->tn_type != VDIR && 1178 tnode->tn_type != VDIR); 1179 } 1180 } 1181 1182 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1183 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1184 error = EPERM; 1185 goto out_locked; 1186 } 1187 1188 /* Ensure that we have enough memory to hold the new name, if it 1189 * has to be changed. */ 1190 if (fcnp->cn_namelen != tcnp->cn_namelen || 1191 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1192 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1193 } else 1194 newname = NULL; 1195 1196 /* If the node is being moved to another directory, we have to do 1197 * the move. */ 1198 if (fdnode != tdnode) { 1199 /* In case we are moving a directory, we have to adjust its 1200 * parent to point to the new parent. */ 1201 if (de->td_node->tn_type == VDIR) { 1202 struct tmpfs_node *n; 1203 1204 /* Ensure the target directory is not a child of the 1205 * directory being moved. Otherwise, we'd end up 1206 * with stale nodes. */ 1207 n = tdnode; 1208 /* TMPFS_LOCK garanties that no nodes are freed while 1209 * traversing the list. Nodes can only be marked as 1210 * removed: tn_parent == NULL. */ 1211 TMPFS_LOCK(tmp); 1212 TMPFS_NODE_LOCK(n); 1213 while (n != n->tn_dir.tn_parent) { 1214 struct tmpfs_node *parent; 1215 1216 if (n == fnode) { 1217 TMPFS_NODE_UNLOCK(n); 1218 TMPFS_UNLOCK(tmp); 1219 error = EINVAL; 1220 if (newname != NULL) 1221 free(newname, M_TMPFSNAME); 1222 goto out_locked; 1223 } 1224 parent = n->tn_dir.tn_parent; 1225 TMPFS_NODE_UNLOCK(n); 1226 if (parent == NULL) { 1227 n = NULL; 1228 break; 1229 } 1230 TMPFS_NODE_LOCK(parent); 1231 if (parent->tn_dir.tn_parent == NULL) { 1232 TMPFS_NODE_UNLOCK(parent); 1233 n = NULL; 1234 break; 1235 } 1236 n = parent; 1237 } 1238 TMPFS_UNLOCK(tmp); 1239 if (n == NULL) { 1240 error = EINVAL; 1241 if (newname != NULL) 1242 free(newname, M_TMPFSNAME); 1243 goto out_locked; 1244 } 1245 TMPFS_NODE_UNLOCK(n); 1246 1247 /* Adjust the parent pointer. */ 1248 TMPFS_VALIDATE_DIR(fnode); 1249 TMPFS_NODE_LOCK(de->td_node); 1250 de->td_node->tn_dir.tn_parent = tdnode; 1251 TMPFS_NODE_UNLOCK(de->td_node); 1252 1253 /* As a result of changing the target of the '..' 1254 * entry, the link count of the source and target 1255 * directories has to be adjusted. */ 1256 TMPFS_NODE_LOCK(tdnode); 1257 TMPFS_ASSERT_LOCKED(tdnode); 1258 tdnode->tn_links++; 1259 TMPFS_NODE_UNLOCK(tdnode); 1260 1261 TMPFS_NODE_LOCK(fdnode); 1262 TMPFS_ASSERT_LOCKED(fdnode); 1263 fdnode->tn_links--; 1264 TMPFS_NODE_UNLOCK(fdnode); 1265 } 1266 1267 /* Do the move: just remove the entry from the source directory 1268 * and insert it into the target one. */ 1269 tmpfs_dir_detach(fdvp, de); 1270 if (fcnp->cn_flags & DOWHITEOUT) 1271 tmpfs_dir_whiteout_add(fdvp, fcnp); 1272 if (tcnp->cn_flags & ISWHITEOUT) 1273 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1274 tmpfs_dir_attach(tdvp, de); 1275 } 1276 1277 /* If the name has changed, we need to make it effective by changing 1278 * it in the directory entry. */ 1279 if (newname != NULL) { 1280 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1281 1282 free(de->td_name, M_TMPFSNAME); 1283 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1284 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1285 de->td_name = newname; 1286 1287 fnode->tn_status |= TMPFS_NODE_CHANGED; 1288 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1289 } 1290 1291 /* If we are overwriting an entry, we have to remove the old one 1292 * from the target directory. */ 1293 if (tvp != NULL) { 1294 /* Remove the old entry from the target directory. */ 1295 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1296 tmpfs_dir_detach(tdvp, de); 1297 1298 /* Free the directory entry we just deleted. Note that the 1299 * node referred by it will not be removed until the vnode is 1300 * really reclaimed. */ 1301 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1302 } 1303 cache_purge(fvp); 1304 if (tvp != NULL) 1305 cache_purge(tvp); 1306 1307 error = 0; 1308 1309out_locked: 1310 if (fdvp != tdvp && fdvp != tvp) 1311 VOP_UNLOCK(fdvp, 0); 1312 1313out: 1314 /* Release target nodes. */ 1315 /* XXX: I don't understand when tdvp can be the same as tvp, but 1316 * other code takes care of this... */ 1317 if (tdvp == tvp) 1318 vrele(tdvp); 1319 else 1320 vput(tdvp); 1321 if (tvp != NULL) 1322 vput(tvp); 1323 1324 /* Release source nodes. */ 1325 vrele(fdvp); 1326 vrele(fvp); 1327 1328 if (mp != NULL) 1329 vfs_unbusy(mp); 1330 1331 return error; 1332} 1333 1334/* --------------------------------------------------------------------- */ 1335 1336static int 1337tmpfs_mkdir(struct vop_mkdir_args *v) 1338{ 1339 struct vnode *dvp = v->a_dvp; 1340 struct vnode **vpp = v->a_vpp; 1341 struct componentname *cnp = v->a_cnp; 1342 struct vattr *vap = v->a_vap; 1343 1344 MPASS(vap->va_type == VDIR); 1345 1346 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1347} 1348 1349/* --------------------------------------------------------------------- */ 1350 1351static int 1352tmpfs_rmdir(struct vop_rmdir_args *v) 1353{ 1354 struct vnode *dvp = v->a_dvp; 1355 struct vnode *vp = v->a_vp; 1356 1357 int error; 1358 struct tmpfs_dirent *de; 1359 struct tmpfs_mount *tmp; 1360 struct tmpfs_node *dnode; 1361 struct tmpfs_node *node; 1362 1363 MPASS(VOP_ISLOCKED(dvp)); 1364 MPASS(VOP_ISLOCKED(vp)); 1365 1366 tmp = VFS_TO_TMPFS(dvp->v_mount); 1367 dnode = VP_TO_TMPFS_DIR(dvp); 1368 node = VP_TO_TMPFS_DIR(vp); 1369 1370 /* Directories with more than two entries ('.' and '..') cannot be 1371 * removed. */ 1372 if (node->tn_size > 0) { 1373 error = ENOTEMPTY; 1374 goto out; 1375 } 1376 1377 if ((dnode->tn_flags & APPEND) 1378 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1379 error = EPERM; 1380 goto out; 1381 } 1382 1383 /* This invariant holds only if we are not trying to remove "..". 1384 * We checked for that above so this is safe now. */ 1385 MPASS(node->tn_dir.tn_parent == dnode); 1386 1387 /* Get the directory entry associated with node (vp). This was 1388 * filled by tmpfs_lookup while looking up the entry. */ 1389 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1390 MPASS(TMPFS_DIRENT_MATCHES(de, 1391 v->a_cnp->cn_nameptr, 1392 v->a_cnp->cn_namelen)); 1393 1394 /* Check flags to see if we are allowed to remove the directory. */ 1395 if (dnode->tn_flags & APPEND 1396 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1397 error = EPERM; 1398 goto out; 1399 } 1400 1401 1402 /* Detach the directory entry from the directory (dnode). */ 1403 tmpfs_dir_detach(dvp, de); 1404 if (v->a_cnp->cn_flags & DOWHITEOUT) 1405 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1406 1407 /* No vnode should be allocated for this entry from this point */ 1408 TMPFS_NODE_LOCK(node); 1409 TMPFS_ASSERT_ELOCKED(node); 1410 node->tn_links--; 1411 node->tn_dir.tn_parent = NULL; 1412 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1413 TMPFS_NODE_MODIFIED; 1414 1415 TMPFS_NODE_UNLOCK(node); 1416 1417 TMPFS_NODE_LOCK(dnode); 1418 TMPFS_ASSERT_ELOCKED(dnode); 1419 dnode->tn_links--; 1420 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1421 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1422 TMPFS_NODE_UNLOCK(dnode); 1423 1424 cache_purge(dvp); 1425 cache_purge(vp); 1426 1427 /* Free the directory entry we just deleted. Note that the node 1428 * referred by it will not be removed until the vnode is really 1429 * reclaimed. */ 1430 tmpfs_free_dirent(tmp, de, TRUE); 1431 1432 /* Release the deleted vnode (will destroy the node, notify 1433 * interested parties and clean it from the cache). */ 1434 1435 dnode->tn_status |= TMPFS_NODE_CHANGED; 1436 tmpfs_update(dvp); 1437 1438 error = 0; 1439 1440out: 1441 return error; 1442} 1443 1444/* --------------------------------------------------------------------- */ 1445 1446static int 1447tmpfs_symlink(struct vop_symlink_args *v) 1448{ 1449 struct vnode *dvp = v->a_dvp; 1450 struct vnode **vpp = v->a_vpp; 1451 struct componentname *cnp = v->a_cnp; 1452 struct vattr *vap = v->a_vap; 1453 char *target = v->a_target; 1454 1455#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1456 MPASS(vap->va_type == VLNK); 1457#else 1458 vap->va_type = VLNK; 1459#endif 1460 1461 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1462} 1463 1464/* --------------------------------------------------------------------- */ 1465 1466static int 1467tmpfs_readdir(struct vop_readdir_args *v) 1468{ 1469 struct vnode *vp = v->a_vp; 1470 struct uio *uio = v->a_uio; 1471 int *eofflag = v->a_eofflag; 1472 u_long **cookies = v->a_cookies; 1473 int *ncookies = v->a_ncookies; 1474 1475 int error; 1476 off_t startoff; 1477 off_t cnt = 0; 1478 struct tmpfs_node *node; 1479 1480 /* This operation only makes sense on directory nodes. */ 1481 if (vp->v_type != VDIR) 1482 return ENOTDIR; 1483 1484 node = VP_TO_TMPFS_DIR(vp); 1485 1486 startoff = uio->uio_offset; 1487 1488 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1489 error = tmpfs_dir_getdotdent(node, uio); 1490 if (error != 0) 1491 goto outok; 1492 cnt++; 1493 } 1494 1495 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1496 error = tmpfs_dir_getdotdotdent(node, uio); 1497 if (error != 0) 1498 goto outok; 1499 cnt++; 1500 } 1501 1502 error = tmpfs_dir_getdents(node, uio, &cnt); 1503 1504outok: 1505 MPASS(error >= -1); 1506 1507 if (error == -1) 1508 error = (cnt != 0) ? 0 : EINVAL; 1509 1510 if (eofflag != NULL) 1511 *eofflag = 1512 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1513 1514 /* Update NFS-related variables. */ 1515 if (error == 0 && cookies != NULL && ncookies != NULL) { 1516 off_t i; 1517 off_t off = startoff; 1518 struct tmpfs_dirent *de = NULL; 1519 1520 *ncookies = cnt; 1521 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1522 1523 for (i = 0; i < cnt; i++) { 1524 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1525 if (off == TMPFS_DIRCOOKIE_DOT) { 1526 off = TMPFS_DIRCOOKIE_DOTDOT; 1527 } else { 1528 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1529 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1530 } else if (de != NULL) { 1531 de = TAILQ_NEXT(de, td_entries); 1532 } else { 1533 de = tmpfs_dir_lookupbycookie(node, 1534 off); 1535 MPASS(de != NULL); 1536 de = TAILQ_NEXT(de, td_entries); 1537 } 1538 if (de == NULL) 1539 off = TMPFS_DIRCOOKIE_EOF; 1540 else 1541 off = tmpfs_dircookie(de); 1542 } 1543 1544 (*cookies)[i] = off; 1545 } 1546 MPASS(uio->uio_offset == off); 1547 } 1548 1549 return error; 1550} 1551 1552/* --------------------------------------------------------------------- */ 1553 1554static int 1555tmpfs_readlink(struct vop_readlink_args *v) 1556{ 1557 struct vnode *vp = v->a_vp; 1558 struct uio *uio = v->a_uio; 1559 1560 int error; 1561 struct tmpfs_node *node; 1562 1563 MPASS(uio->uio_offset == 0); 1564 MPASS(vp->v_type == VLNK); 1565 1566 node = VP_TO_TMPFS_NODE(vp); 1567 1568 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1569 uio); 1570 node->tn_status |= TMPFS_NODE_ACCESSED; 1571 1572 return error; 1573} 1574 1575/* --------------------------------------------------------------------- */ 1576 1577static int 1578tmpfs_inactive(struct vop_inactive_args *v) 1579{ 1580 struct vnode *vp = v->a_vp; 1581 1582 struct tmpfs_node *node; 1583 1584 MPASS(VOP_ISLOCKED(vp)); 1585 1586 node = VP_TO_TMPFS_NODE(vp); 1587 1588 if (node->tn_links == 0) 1589 vrecycle(vp); 1590 1591 return 0; 1592} 1593 1594/* --------------------------------------------------------------------- */ 1595 1596int 1597tmpfs_reclaim(struct vop_reclaim_args *v) 1598{ 1599 struct vnode *vp = v->a_vp; 1600 1601 struct tmpfs_mount *tmp; 1602 struct tmpfs_node *node; 1603 1604 node = VP_TO_TMPFS_NODE(vp); 1605 tmp = VFS_TO_TMPFS(vp->v_mount); 1606 1607 vnode_destroy_vobject(vp); 1608 cache_purge(vp); 1609 1610 TMPFS_NODE_LOCK(node); 1611 TMPFS_ASSERT_ELOCKED(node); 1612 tmpfs_free_vp(vp); 1613 1614 /* If the node referenced by this vnode was deleted by the user, 1615 * we must free its associated data structures (now that the vnode 1616 * is being reclaimed). */ 1617 if (node->tn_links == 0 && 1618 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1619 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1620 TMPFS_NODE_UNLOCK(node); 1621 tmpfs_free_node(tmp, node); 1622 } else 1623 TMPFS_NODE_UNLOCK(node); 1624 1625 MPASS(vp->v_data == NULL); 1626 return 0; 1627} 1628 1629/* --------------------------------------------------------------------- */ 1630 1631static int 1632tmpfs_print(struct vop_print_args *v) 1633{ 1634 struct vnode *vp = v->a_vp; 1635 1636 struct tmpfs_node *node; 1637 1638 node = VP_TO_TMPFS_NODE(vp); 1639 1640 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1641 node, node->tn_flags, node->tn_links); 1642 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1643 node->tn_mode, node->tn_uid, node->tn_gid, 1644 (intmax_t)node->tn_size, node->tn_status); 1645 1646 if (vp->v_type == VFIFO) 1647 fifo_printinfo(vp); 1648 1649 printf("\n"); 1650 1651 return 0; 1652} 1653 1654/* --------------------------------------------------------------------- */ 1655 1656static int 1657tmpfs_pathconf(struct vop_pathconf_args *v) 1658{ 1659 int name = v->a_name; 1660 register_t *retval = v->a_retval; 1661 1662 int error; 1663 1664 error = 0; 1665 1666 switch (name) { 1667 case _PC_LINK_MAX: 1668 *retval = LINK_MAX; 1669 break; 1670 1671 case _PC_NAME_MAX: 1672 *retval = NAME_MAX; 1673 break; 1674 1675 case _PC_PATH_MAX: 1676 *retval = PATH_MAX; 1677 break; 1678 1679 case _PC_PIPE_BUF: 1680 *retval = PIPE_BUF; 1681 break; 1682 1683 case _PC_CHOWN_RESTRICTED: 1684 *retval = 1; 1685 break; 1686 1687 case _PC_NO_TRUNC: 1688 *retval = 1; 1689 break; 1690 1691 case _PC_SYNC_IO: 1692 *retval = 1; 1693 break; 1694 1695 case _PC_FILESIZEBITS: 1696 *retval = 0; /* XXX Don't know which value should I return. */ 1697 break; 1698 1699 default: 1700 error = EINVAL; 1701 } 1702 1703 return error; 1704} 1705 1706static int 1707tmpfs_vptofh(struct vop_vptofh_args *ap) 1708{ 1709 struct tmpfs_fid *tfhp; 1710 struct tmpfs_node *node; 1711 1712 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1713 node = VP_TO_TMPFS_NODE(ap->a_vp); 1714 1715 tfhp->tf_len = sizeof(struct tmpfs_fid); 1716 tfhp->tf_id = node->tn_id; 1717 tfhp->tf_gen = node->tn_gen; 1718 1719 return (0); 1720} 1721 1722static int 1723tmpfs_whiteout(struct vop_whiteout_args *ap) 1724{ 1725 struct vnode *dvp = ap->a_dvp; 1726 struct componentname *cnp = ap->a_cnp; 1727 struct tmpfs_dirent *de; 1728 1729 switch (ap->a_flags) { 1730 case LOOKUP: 1731 return (0); 1732 case CREATE: 1733 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1734 if (de != NULL) 1735 return (de->td_node == NULL ? 0 : EEXIST); 1736 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1737 case DELETE: 1738 tmpfs_dir_whiteout_remove(dvp, cnp); 1739 return (0); 1740 default: 1741 panic("tmpfs_whiteout: unknown op"); 1742 } 1743} 1744 1745/* --------------------------------------------------------------------- */ 1746 1747/* 1748 * vnode operations vector used for files stored in a tmpfs file system. 1749 */ 1750struct vop_vector tmpfs_vnodeop_entries = { 1751 .vop_default = &default_vnodeops, 1752 .vop_lookup = vfs_cache_lookup, 1753 .vop_cachedlookup = tmpfs_lookup, 1754 .vop_create = tmpfs_create, 1755 .vop_mknod = tmpfs_mknod, 1756 .vop_open = tmpfs_open, 1757 .vop_close = tmpfs_close, 1758 .vop_access = tmpfs_access, 1759 .vop_getattr = tmpfs_getattr, 1760 .vop_setattr = tmpfs_setattr, 1761 .vop_read = tmpfs_read, 1762 .vop_write = tmpfs_write, 1763 .vop_fsync = tmpfs_fsync, 1764 .vop_remove = tmpfs_remove, 1765 .vop_link = tmpfs_link, 1766 .vop_rename = tmpfs_rename, 1767 .vop_mkdir = tmpfs_mkdir, 1768 .vop_rmdir = tmpfs_rmdir, 1769 .vop_symlink = tmpfs_symlink, 1770 .vop_readdir = tmpfs_readdir, 1771 .vop_readlink = tmpfs_readlink, 1772 .vop_inactive = tmpfs_inactive, 1773 .vop_reclaim = tmpfs_reclaim, 1774 .vop_print = tmpfs_print, 1775 .vop_pathconf = tmpfs_pathconf, 1776 .vop_vptofh = tmpfs_vptofh, 1777 .vop_whiteout = tmpfs_whiteout, 1778 .vop_bmap = VOP_EOPNOTSUPP, 1779}; 1780 1781