tmpfs_vnops.c revision 312804
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: stable/11/sys/fs/tmpfs/tmpfs_vnops.c 312804 2017-01-26 10:53:05Z kib $"); 38 39#include <sys/param.h> 40#include <sys/fcntl.h> 41#include <sys/lockf.h> 42#include <sys/lock.h> 43#include <sys/namei.h> 44#include <sys/priv.h> 45#include <sys/proc.h> 46#include <sys/rwlock.h> 47#include <sys/sched.h> 48#include <sys/stat.h> 49#include <sys/systm.h> 50#include <sys/sysctl.h> 51#include <sys/unistd.h> 52#include <sys/vnode.h> 53 54#include <vm/vm.h> 55#include <vm/vm_param.h> 56#include <vm/vm_object.h> 57#include <vm/vm_page.h> 58#include <vm/vm_pager.h> 59 60#include <fs/tmpfs/tmpfs_vnops.h> 61#include <fs/tmpfs/tmpfs.h> 62 63SYSCTL_DECL(_vfs_tmpfs); 64 65static volatile int tmpfs_rename_restarts; 66SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 68 "Times rename had to restart due to lock contention"); 69 70static int 71tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 72 struct vnode **rvp) 73{ 74 75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 76} 77 78static int 79tmpfs_lookup(struct vop_cachedlookup_args *v) 80{ 81 struct vnode *dvp = v->a_dvp; 82 struct vnode **vpp = v->a_vpp; 83 struct componentname *cnp = v->a_cnp; 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode; 86 int error; 87 88 dnode = VP_TO_TMPFS_DIR(dvp); 89 *vpp = NULLVP; 90 91 /* Check accessibility of requested node as a first step. */ 92 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 93 if (error != 0) 94 goto out; 95 96 /* We cannot be requesting the parent directory of the root node. */ 97 MPASS(IMPLIES(dnode->tn_type == VDIR && 98 dnode->tn_dir.tn_parent == dnode, 99 !(cnp->cn_flags & ISDOTDOT))); 100 101 TMPFS_ASSERT_LOCKED(dnode); 102 if (dnode->tn_dir.tn_parent == NULL) { 103 error = ENOENT; 104 goto out; 105 } 106 if (cnp->cn_flags & ISDOTDOT) { 107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 108 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp); 109 if (error != 0) 110 goto out; 111 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 112 VREF(dvp); 113 *vpp = dvp; 114 error = 0; 115 } else { 116 de = tmpfs_dir_lookup(dnode, NULL, cnp); 117 if (de != NULL && de->td_node == NULL) 118 cnp->cn_flags |= ISWHITEOUT; 119 if (de == NULL || de->td_node == NULL) { 120 /* 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 */ 126 if ((cnp->cn_flags & ISLASTCN) && 127 (cnp->cn_nameiop == CREATE || \ 128 cnp->cn_nameiop == RENAME || 129 (cnp->cn_nameiop == DELETE && 130 cnp->cn_flags & DOWHITEOUT && 131 cnp->cn_flags & ISWHITEOUT))) { 132 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 133 cnp->cn_thread); 134 if (error != 0) 135 goto out; 136 137 /* 138 * Keep the component name in the buffer for 139 * future uses. 140 */ 141 cnp->cn_flags |= SAVENAME; 142 143 error = EJUSTRETURN; 144 } else 145 error = ENOENT; 146 } else { 147 struct tmpfs_node *tnode; 148 149 /* 150 * The entry was found, so get its associated 151 * tmpfs_node. 152 */ 153 tnode = de->td_node; 154 155 /* 156 * If we are not at the last path component and 157 * found a non-directory or non-link entry (which 158 * may itself be pointing to a directory), raise 159 * an error. 160 */ 161 if ((tnode->tn_type != VDIR && 162 tnode->tn_type != VLNK) && 163 !(cnp->cn_flags & ISLASTCN)) { 164 error = ENOTDIR; 165 goto out; 166 } 167 168 /* 169 * If we are deleting or renaming the entry, keep 170 * track of its tmpfs_dirent so that it can be 171 * easily deleted later. 172 */ 173 if ((cnp->cn_flags & ISLASTCN) && 174 (cnp->cn_nameiop == DELETE || 175 cnp->cn_nameiop == RENAME)) { 176 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 177 cnp->cn_thread); 178 if (error != 0) 179 goto out; 180 181 /* Allocate a new vnode on the matching entry. */ 182 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 183 cnp->cn_lkflags, vpp); 184 if (error != 0) 185 goto out; 186 187 if ((dnode->tn_mode & S_ISTXT) && 188 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 189 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 190 cnp->cn_cred, cnp->cn_thread)) { 191 error = EPERM; 192 vput(*vpp); 193 *vpp = NULL; 194 goto out; 195 } 196 cnp->cn_flags |= SAVENAME; 197 } else { 198 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 199 cnp->cn_lkflags, vpp); 200 if (error != 0) 201 goto out; 202 } 203 } 204 } 205 206 /* 207 * Store the result of this lookup in the cache. Avoid this if the 208 * request was for creation, as it does not improve timings on 209 * emprical tests. 210 */ 211 if ((cnp->cn_flags & MAKEENTRY) != 0) 212 cache_enter(dvp, *vpp, cnp); 213 214out: 215 /* 216 * If there were no errors, *vpp cannot be null and it must be 217 * locked. 218 */ 219 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 220 221 return (error); 222} 223 224static int 225tmpfs_create(struct vop_create_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 int error; 232 233 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 234 235 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 236 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 237 cache_enter(dvp, *vpp, cnp); 238 return (error); 239} 240 241static int 242tmpfs_mknod(struct vop_mknod_args *v) 243{ 244 struct vnode *dvp = v->a_dvp; 245 struct vnode **vpp = v->a_vpp; 246 struct componentname *cnp = v->a_cnp; 247 struct vattr *vap = v->a_vap; 248 249 if (vap->va_type != VBLK && vap->va_type != VCHR && 250 vap->va_type != VFIFO) 251 return EINVAL; 252 253 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 254} 255 256static int 257tmpfs_open(struct vop_open_args *v) 258{ 259 struct vnode *vp = v->a_vp; 260 int mode = v->a_mode; 261 262 int error; 263 struct tmpfs_node *node; 264 265 MPASS(VOP_ISLOCKED(vp)); 266 267 node = VP_TO_TMPFS_NODE(vp); 268 269 /* The file is still active but all its names have been removed 270 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 271 * it is about to die. */ 272 if (node->tn_links < 1) 273 return (ENOENT); 274 275 /* If the file is marked append-only, deny write requests. */ 276 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 277 error = EPERM; 278 else { 279 error = 0; 280 /* For regular files, the call below is nop. */ 281 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 282 OBJ_DEAD) == 0, ("dead object")); 283 vnode_create_vobject(vp, node->tn_size, v->a_td); 284 } 285 286 MPASS(VOP_ISLOCKED(vp)); 287 return error; 288} 289 290static int 291tmpfs_close(struct vop_close_args *v) 292{ 293 struct vnode *vp = v->a_vp; 294 295 /* Update node times. */ 296 tmpfs_update(vp); 297 298 return (0); 299} 300 301int 302tmpfs_access(struct vop_access_args *v) 303{ 304 struct vnode *vp = v->a_vp; 305 accmode_t accmode = v->a_accmode; 306 struct ucred *cred = v->a_cred; 307 308 int error; 309 struct tmpfs_node *node; 310 311 MPASS(VOP_ISLOCKED(vp)); 312 313 node = VP_TO_TMPFS_NODE(vp); 314 315 switch (vp->v_type) { 316 case VDIR: 317 /* FALLTHROUGH */ 318 case VLNK: 319 /* FALLTHROUGH */ 320 case VREG: 321 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 322 error = EROFS; 323 goto out; 324 } 325 break; 326 327 case VBLK: 328 /* FALLTHROUGH */ 329 case VCHR: 330 /* FALLTHROUGH */ 331 case VSOCK: 332 /* FALLTHROUGH */ 333 case VFIFO: 334 break; 335 336 default: 337 error = EINVAL; 338 goto out; 339 } 340 341 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 342 error = EPERM; 343 goto out; 344 } 345 346 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 347 node->tn_gid, accmode, cred, NULL); 348 349out: 350 MPASS(VOP_ISLOCKED(vp)); 351 352 return error; 353} 354 355int 356tmpfs_getattr(struct vop_getattr_args *v) 357{ 358 struct vnode *vp = v->a_vp; 359 struct vattr *vap = v->a_vap; 360 vm_object_t obj; 361 struct tmpfs_node *node; 362 363 node = VP_TO_TMPFS_NODE(vp); 364 365 tmpfs_update(vp); 366 367 vap->va_type = vp->v_type; 368 vap->va_mode = node->tn_mode; 369 vap->va_nlink = node->tn_links; 370 vap->va_uid = node->tn_uid; 371 vap->va_gid = node->tn_gid; 372 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 373 vap->va_fileid = node->tn_id; 374 vap->va_size = node->tn_size; 375 vap->va_blocksize = PAGE_SIZE; 376 vap->va_atime = node->tn_atime; 377 vap->va_mtime = node->tn_mtime; 378 vap->va_ctime = node->tn_ctime; 379 vap->va_birthtime = node->tn_birthtime; 380 vap->va_gen = node->tn_gen; 381 vap->va_flags = node->tn_flags; 382 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 383 node->tn_rdev : NODEV; 384 if (vp->v_type == VREG) { 385 obj = node->tn_reg.tn_aobj; 386 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 387 } else 388 vap->va_bytes = node->tn_size; 389 vap->va_filerev = 0; 390 391 return 0; 392} 393 394int 395tmpfs_setattr(struct vop_setattr_args *v) 396{ 397 struct vnode *vp = v->a_vp; 398 struct vattr *vap = v->a_vap; 399 struct ucred *cred = v->a_cred; 400 struct thread *td = curthread; 401 402 int error; 403 404 MPASS(VOP_ISLOCKED(vp)); 405 406 error = 0; 407 408 /* Abort if any unsettable attribute is given. */ 409 if (vap->va_type != VNON || 410 vap->va_nlink != VNOVAL || 411 vap->va_fsid != VNOVAL || 412 vap->va_fileid != VNOVAL || 413 vap->va_blocksize != VNOVAL || 414 vap->va_gen != VNOVAL || 415 vap->va_rdev != VNOVAL || 416 vap->va_bytes != VNOVAL) 417 error = EINVAL; 418 419 if (error == 0 && (vap->va_flags != VNOVAL)) 420 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 421 422 if (error == 0 && (vap->va_size != VNOVAL)) 423 error = tmpfs_chsize(vp, vap->va_size, cred, td); 424 425 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 426 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 427 428 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 429 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 430 431 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 432 vap->va_atime.tv_nsec != VNOVAL) || 433 (vap->va_mtime.tv_sec != VNOVAL && 434 vap->va_mtime.tv_nsec != VNOVAL) || 435 (vap->va_birthtime.tv_sec != VNOVAL && 436 vap->va_birthtime.tv_nsec != VNOVAL))) 437 error = tmpfs_chtimes(vp, vap, cred, td); 438 439 /* Update the node times. We give preference to the error codes 440 * generated by this function rather than the ones that may arise 441 * from tmpfs_update. */ 442 tmpfs_update(vp); 443 444 MPASS(VOP_ISLOCKED(vp)); 445 446 return error; 447} 448 449static int 450tmpfs_read(struct vop_read_args *v) 451{ 452 struct vnode *vp; 453 struct uio *uio; 454 struct tmpfs_node *node; 455 456 vp = v->a_vp; 457 if (vp->v_type != VREG) 458 return (EISDIR); 459 uio = v->a_uio; 460 if (uio->uio_offset < 0) 461 return (EINVAL); 462 node = VP_TO_TMPFS_NODE(vp); 463 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 464 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 465} 466 467static int 468tmpfs_write(struct vop_write_args *v) 469{ 470 struct vnode *vp; 471 struct uio *uio; 472 struct tmpfs_node *node; 473 off_t oldsize; 474 int error, ioflag; 475 476 vp = v->a_vp; 477 uio = v->a_uio; 478 ioflag = v->a_ioflag; 479 error = 0; 480 node = VP_TO_TMPFS_NODE(vp); 481 oldsize = node->tn_size; 482 483 if (uio->uio_offset < 0 || vp->v_type != VREG) 484 return (EINVAL); 485 if (uio->uio_resid == 0) 486 return (0); 487 if (ioflag & IO_APPEND) 488 uio->uio_offset = node->tn_size; 489 if (uio->uio_offset + uio->uio_resid > 490 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 491 return (EFBIG); 492 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 493 return (EFBIG); 494 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 495 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 496 FALSE); 497 if (error != 0) 498 goto out; 499 } 500 501 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 502 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 503 TMPFS_NODE_CHANGED; 504 if (node->tn_mode & (S_ISUID | S_ISGID)) { 505 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 506 node->tn_mode &= ~(S_ISUID | S_ISGID); 507 } 508 if (error != 0) 509 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 510 511out: 512 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 513 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 514 515 return (error); 516} 517 518static int 519tmpfs_fsync(struct vop_fsync_args *v) 520{ 521 struct vnode *vp = v->a_vp; 522 523 MPASS(VOP_ISLOCKED(vp)); 524 525 tmpfs_check_mtime(vp); 526 tmpfs_update(vp); 527 528 return 0; 529} 530 531static int 532tmpfs_remove(struct vop_remove_args *v) 533{ 534 struct vnode *dvp = v->a_dvp; 535 struct vnode *vp = v->a_vp; 536 537 int error; 538 struct tmpfs_dirent *de; 539 struct tmpfs_mount *tmp; 540 struct tmpfs_node *dnode; 541 struct tmpfs_node *node; 542 543 MPASS(VOP_ISLOCKED(dvp)); 544 MPASS(VOP_ISLOCKED(vp)); 545 546 if (vp->v_type == VDIR) { 547 error = EISDIR; 548 goto out; 549 } 550 551 dnode = VP_TO_TMPFS_DIR(dvp); 552 node = VP_TO_TMPFS_NODE(vp); 553 tmp = VFS_TO_TMPFS(vp->v_mount); 554 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 555 MPASS(de != NULL); 556 557 /* Files marked as immutable or append-only cannot be deleted. */ 558 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 559 (dnode->tn_flags & APPEND)) { 560 error = EPERM; 561 goto out; 562 } 563 564 /* Remove the entry from the directory; as it is a file, we do not 565 * have to change the number of hard links of the directory. */ 566 tmpfs_dir_detach(dvp, de); 567 if (v->a_cnp->cn_flags & DOWHITEOUT) 568 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 569 570 /* Free the directory entry we just deleted. Note that the node 571 * referred by it will not be removed until the vnode is really 572 * reclaimed. */ 573 tmpfs_free_dirent(tmp, de); 574 575 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 576 error = 0; 577 578out: 579 580 return error; 581} 582 583static int 584tmpfs_link(struct vop_link_args *v) 585{ 586 struct vnode *dvp = v->a_tdvp; 587 struct vnode *vp = v->a_vp; 588 struct componentname *cnp = v->a_cnp; 589 590 int error; 591 struct tmpfs_dirent *de; 592 struct tmpfs_node *node; 593 594 MPASS(VOP_ISLOCKED(dvp)); 595 MPASS(cnp->cn_flags & HASBUF); 596 MPASS(dvp != vp); /* XXX When can this be false? */ 597 node = VP_TO_TMPFS_NODE(vp); 598 599 /* Ensure that we do not overflow the maximum number of links imposed 600 * by the system. */ 601 MPASS(node->tn_links <= LINK_MAX); 602 if (node->tn_links == LINK_MAX) { 603 error = EMLINK; 604 goto out; 605 } 606 607 /* We cannot create links of files marked immutable or append-only. */ 608 if (node->tn_flags & (IMMUTABLE | APPEND)) { 609 error = EPERM; 610 goto out; 611 } 612 613 /* Allocate a new directory entry to represent the node. */ 614 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 615 cnp->cn_nameptr, cnp->cn_namelen, &de); 616 if (error != 0) 617 goto out; 618 619 /* Insert the new directory entry into the appropriate directory. */ 620 if (cnp->cn_flags & ISWHITEOUT) 621 tmpfs_dir_whiteout_remove(dvp, cnp); 622 tmpfs_dir_attach(dvp, de); 623 624 /* vp link count has changed, so update node times. */ 625 node->tn_status |= TMPFS_NODE_CHANGED; 626 tmpfs_update(vp); 627 628 error = 0; 629 630out: 631 return error; 632} 633 634/* 635 * We acquire all but fdvp locks using non-blocking acquisitions. If we 636 * fail to acquire any lock in the path we will drop all held locks, 637 * acquire the new lock in a blocking fashion, and then release it and 638 * restart the rename. This acquire/release step ensures that we do not 639 * spin on a lock waiting for release. On error release all vnode locks 640 * and decrement references the way tmpfs_rename() would do. 641 */ 642static int 643tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 644 struct vnode *tdvp, struct vnode **tvpp, 645 struct componentname *fcnp, struct componentname *tcnp) 646{ 647 struct vnode *nvp; 648 struct mount *mp; 649 struct tmpfs_dirent *de; 650 int error, restarts = 0; 651 652 VOP_UNLOCK(tdvp, 0); 653 if (*tvpp != NULL && *tvpp != tdvp) 654 VOP_UNLOCK(*tvpp, 0); 655 mp = fdvp->v_mount; 656 657relock: 658 restarts += 1; 659 error = vn_lock(fdvp, LK_EXCLUSIVE); 660 if (error) 661 goto releout; 662 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 663 VOP_UNLOCK(fdvp, 0); 664 error = vn_lock(tdvp, LK_EXCLUSIVE); 665 if (error) 666 goto releout; 667 VOP_UNLOCK(tdvp, 0); 668 goto relock; 669 } 670 /* 671 * Re-resolve fvp to be certain it still exists and fetch the 672 * correct vnode. 673 */ 674 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 675 if (de == NULL) { 676 VOP_UNLOCK(fdvp, 0); 677 VOP_UNLOCK(tdvp, 0); 678 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 679 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 680 error = EINVAL; 681 else 682 error = ENOENT; 683 goto releout; 684 } 685 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 686 if (error != 0) { 687 VOP_UNLOCK(fdvp, 0); 688 VOP_UNLOCK(tdvp, 0); 689 if (error != EBUSY) 690 goto releout; 691 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 692 if (error != 0) 693 goto releout; 694 VOP_UNLOCK(nvp, 0); 695 /* 696 * Concurrent rename race. 697 */ 698 if (nvp == tdvp) { 699 vrele(nvp); 700 error = EINVAL; 701 goto releout; 702 } 703 vrele(*fvpp); 704 *fvpp = nvp; 705 goto relock; 706 } 707 vrele(*fvpp); 708 *fvpp = nvp; 709 VOP_UNLOCK(*fvpp, 0); 710 /* 711 * Re-resolve tvp and acquire the vnode lock if present. 712 */ 713 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 714 /* 715 * If tvp disappeared we just carry on. 716 */ 717 if (de == NULL && *tvpp != NULL) { 718 vrele(*tvpp); 719 *tvpp = NULL; 720 } 721 /* 722 * Get the tvp ino if the lookup succeeded. We may have to restart 723 * if the non-blocking acquire fails. 724 */ 725 if (de != NULL) { 726 nvp = NULL; 727 error = tmpfs_alloc_vp(mp, de->td_node, 728 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 729 if (*tvpp != NULL) 730 vrele(*tvpp); 731 *tvpp = nvp; 732 if (error != 0) { 733 VOP_UNLOCK(fdvp, 0); 734 VOP_UNLOCK(tdvp, 0); 735 if (error != EBUSY) 736 goto releout; 737 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 738 &nvp); 739 if (error != 0) 740 goto releout; 741 VOP_UNLOCK(nvp, 0); 742 /* 743 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 744 */ 745 if (nvp == fdvp) { 746 error = ENOTEMPTY; 747 goto releout; 748 } 749 goto relock; 750 } 751 } 752 tmpfs_rename_restarts += restarts; 753 754 return (0); 755 756releout: 757 vrele(fdvp); 758 vrele(*fvpp); 759 vrele(tdvp); 760 if (*tvpp != NULL) 761 vrele(*tvpp); 762 tmpfs_rename_restarts += restarts; 763 764 return (error); 765} 766 767static int 768tmpfs_rename(struct vop_rename_args *v) 769{ 770 struct vnode *fdvp = v->a_fdvp; 771 struct vnode *fvp = v->a_fvp; 772 struct componentname *fcnp = v->a_fcnp; 773 struct vnode *tdvp = v->a_tdvp; 774 struct vnode *tvp = v->a_tvp; 775 struct componentname *tcnp = v->a_tcnp; 776 struct mount *mp = NULL; 777 778 char *newname; 779 int error; 780 struct tmpfs_dirent *de; 781 struct tmpfs_mount *tmp; 782 struct tmpfs_node *fdnode; 783 struct tmpfs_node *fnode; 784 struct tmpfs_node *tnode; 785 struct tmpfs_node *tdnode; 786 787 MPASS(VOP_ISLOCKED(tdvp)); 788 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 789 MPASS(fcnp->cn_flags & HASBUF); 790 MPASS(tcnp->cn_flags & HASBUF); 791 792 /* Disallow cross-device renames. 793 * XXX Why isn't this done by the caller? */ 794 if (fvp->v_mount != tdvp->v_mount || 795 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 796 error = EXDEV; 797 goto out; 798 } 799 800 /* If source and target are the same file, there is nothing to do. */ 801 if (fvp == tvp) { 802 error = 0; 803 goto out; 804 } 805 806 /* If we need to move the directory between entries, lock the 807 * source so that we can safely operate on it. */ 808 if (fdvp != tdvp && fdvp != tvp) { 809 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 810 mp = tdvp->v_mount; 811 error = vfs_busy(mp, 0); 812 if (error != 0) { 813 mp = NULL; 814 goto out; 815 } 816 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 817 fcnp, tcnp); 818 if (error != 0) { 819 vfs_unbusy(mp); 820 return (error); 821 } 822 ASSERT_VOP_ELOCKED(fdvp, 823 "tmpfs_rename: fdvp not locked"); 824 ASSERT_VOP_ELOCKED(tdvp, 825 "tmpfs_rename: tdvp not locked"); 826 if (tvp != NULL) 827 ASSERT_VOP_ELOCKED(tvp, 828 "tmpfs_rename: tvp not locked"); 829 if (fvp == tvp) { 830 error = 0; 831 goto out_locked; 832 } 833 } 834 } 835 836 tmp = VFS_TO_TMPFS(tdvp->v_mount); 837 tdnode = VP_TO_TMPFS_DIR(tdvp); 838 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 839 fdnode = VP_TO_TMPFS_DIR(fdvp); 840 fnode = VP_TO_TMPFS_NODE(fvp); 841 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 842 843 /* Entry can disappear before we lock fdvp, 844 * also avoid manipulating '.' and '..' entries. */ 845 if (de == NULL) { 846 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 847 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 848 error = EINVAL; 849 else 850 error = ENOENT; 851 goto out_locked; 852 } 853 MPASS(de->td_node == fnode); 854 855 /* If re-naming a directory to another preexisting directory 856 * ensure that the target directory is empty so that its 857 * removal causes no side effects. 858 * Kern_rename guarantees the destination to be a directory 859 * if the source is one. */ 860 if (tvp != NULL) { 861 MPASS(tnode != NULL); 862 863 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 864 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 865 error = EPERM; 866 goto out_locked; 867 } 868 869 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 870 if (tnode->tn_size > 0) { 871 error = ENOTEMPTY; 872 goto out_locked; 873 } 874 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 875 error = ENOTDIR; 876 goto out_locked; 877 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 878 error = EISDIR; 879 goto out_locked; 880 } else { 881 MPASS(fnode->tn_type != VDIR && 882 tnode->tn_type != VDIR); 883 } 884 } 885 886 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 887 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 888 error = EPERM; 889 goto out_locked; 890 } 891 892 /* Ensure that we have enough memory to hold the new name, if it 893 * has to be changed. */ 894 if (fcnp->cn_namelen != tcnp->cn_namelen || 895 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 896 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 897 } else 898 newname = NULL; 899 900 /* If the node is being moved to another directory, we have to do 901 * the move. */ 902 if (fdnode != tdnode) { 903 /* In case we are moving a directory, we have to adjust its 904 * parent to point to the new parent. */ 905 if (de->td_node->tn_type == VDIR) { 906 struct tmpfs_node *n; 907 908 /* Ensure the target directory is not a child of the 909 * directory being moved. Otherwise, we'd end up 910 * with stale nodes. */ 911 n = tdnode; 912 /* TMPFS_LOCK garanties that no nodes are freed while 913 * traversing the list. Nodes can only be marked as 914 * removed: tn_parent == NULL. */ 915 TMPFS_LOCK(tmp); 916 TMPFS_NODE_LOCK(n); 917 while (n != n->tn_dir.tn_parent) { 918 struct tmpfs_node *parent; 919 920 if (n == fnode) { 921 TMPFS_NODE_UNLOCK(n); 922 TMPFS_UNLOCK(tmp); 923 error = EINVAL; 924 if (newname != NULL) 925 free(newname, M_TMPFSNAME); 926 goto out_locked; 927 } 928 parent = n->tn_dir.tn_parent; 929 TMPFS_NODE_UNLOCK(n); 930 if (parent == NULL) { 931 n = NULL; 932 break; 933 } 934 TMPFS_NODE_LOCK(parent); 935 if (parent->tn_dir.tn_parent == NULL) { 936 TMPFS_NODE_UNLOCK(parent); 937 n = NULL; 938 break; 939 } 940 n = parent; 941 } 942 TMPFS_UNLOCK(tmp); 943 if (n == NULL) { 944 error = EINVAL; 945 if (newname != NULL) 946 free(newname, M_TMPFSNAME); 947 goto out_locked; 948 } 949 TMPFS_NODE_UNLOCK(n); 950 951 /* Adjust the parent pointer. */ 952 TMPFS_VALIDATE_DIR(fnode); 953 TMPFS_NODE_LOCK(de->td_node); 954 de->td_node->tn_dir.tn_parent = tdnode; 955 TMPFS_NODE_UNLOCK(de->td_node); 956 957 /* As a result of changing the target of the '..' 958 * entry, the link count of the source and target 959 * directories has to be adjusted. */ 960 TMPFS_NODE_LOCK(tdnode); 961 TMPFS_ASSERT_LOCKED(tdnode); 962 tdnode->tn_links++; 963 TMPFS_NODE_UNLOCK(tdnode); 964 965 TMPFS_NODE_LOCK(fdnode); 966 TMPFS_ASSERT_LOCKED(fdnode); 967 fdnode->tn_links--; 968 TMPFS_NODE_UNLOCK(fdnode); 969 } 970 } 971 972 /* Do the move: just remove the entry from the source directory 973 * and insert it into the target one. */ 974 tmpfs_dir_detach(fdvp, de); 975 976 if (fcnp->cn_flags & DOWHITEOUT) 977 tmpfs_dir_whiteout_add(fdvp, fcnp); 978 if (tcnp->cn_flags & ISWHITEOUT) 979 tmpfs_dir_whiteout_remove(tdvp, tcnp); 980 981 /* If the name has changed, we need to make it effective by changing 982 * it in the directory entry. */ 983 if (newname != NULL) { 984 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 985 986 free(de->ud.td_name, M_TMPFSNAME); 987 de->ud.td_name = newname; 988 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 989 990 fnode->tn_status |= TMPFS_NODE_CHANGED; 991 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 992 } 993 994 /* If we are overwriting an entry, we have to remove the old one 995 * from the target directory. */ 996 if (tvp != NULL) { 997 struct tmpfs_dirent *tde; 998 999 /* Remove the old entry from the target directory. */ 1000 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1001 tmpfs_dir_detach(tdvp, tde); 1002 1003 /* Free the directory entry we just deleted. Note that the 1004 * node referred by it will not be removed until the vnode is 1005 * really reclaimed. */ 1006 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1007 } 1008 1009 tmpfs_dir_attach(tdvp, de); 1010 1011 cache_purge(fvp); 1012 if (tvp != NULL) 1013 cache_purge(tvp); 1014 cache_purge_negative(tdvp); 1015 1016 error = 0; 1017 1018out_locked: 1019 if (fdvp != tdvp && fdvp != tvp) 1020 VOP_UNLOCK(fdvp, 0); 1021 1022out: 1023 /* Release target nodes. */ 1024 /* XXX: I don't understand when tdvp can be the same as tvp, but 1025 * other code takes care of this... */ 1026 if (tdvp == tvp) 1027 vrele(tdvp); 1028 else 1029 vput(tdvp); 1030 if (tvp != NULL) 1031 vput(tvp); 1032 1033 /* Release source nodes. */ 1034 vrele(fdvp); 1035 vrele(fvp); 1036 1037 if (mp != NULL) 1038 vfs_unbusy(mp); 1039 1040 return error; 1041} 1042 1043static int 1044tmpfs_mkdir(struct vop_mkdir_args *v) 1045{ 1046 struct vnode *dvp = v->a_dvp; 1047 struct vnode **vpp = v->a_vpp; 1048 struct componentname *cnp = v->a_cnp; 1049 struct vattr *vap = v->a_vap; 1050 1051 MPASS(vap->va_type == VDIR); 1052 1053 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1054} 1055 1056static int 1057tmpfs_rmdir(struct vop_rmdir_args *v) 1058{ 1059 struct vnode *dvp = v->a_dvp; 1060 struct vnode *vp = v->a_vp; 1061 1062 int error; 1063 struct tmpfs_dirent *de; 1064 struct tmpfs_mount *tmp; 1065 struct tmpfs_node *dnode; 1066 struct tmpfs_node *node; 1067 1068 MPASS(VOP_ISLOCKED(dvp)); 1069 MPASS(VOP_ISLOCKED(vp)); 1070 1071 tmp = VFS_TO_TMPFS(dvp->v_mount); 1072 dnode = VP_TO_TMPFS_DIR(dvp); 1073 node = VP_TO_TMPFS_DIR(vp); 1074 1075 /* Directories with more than two entries ('.' and '..') cannot be 1076 * removed. */ 1077 if (node->tn_size > 0) { 1078 error = ENOTEMPTY; 1079 goto out; 1080 } 1081 1082 if ((dnode->tn_flags & APPEND) 1083 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1084 error = EPERM; 1085 goto out; 1086 } 1087 1088 /* This invariant holds only if we are not trying to remove "..". 1089 * We checked for that above so this is safe now. */ 1090 MPASS(node->tn_dir.tn_parent == dnode); 1091 1092 /* Get the directory entry associated with node (vp). This was 1093 * filled by tmpfs_lookup while looking up the entry. */ 1094 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1095 MPASS(TMPFS_DIRENT_MATCHES(de, 1096 v->a_cnp->cn_nameptr, 1097 v->a_cnp->cn_namelen)); 1098 1099 /* Check flags to see if we are allowed to remove the directory. */ 1100 if ((dnode->tn_flags & APPEND) != 0 || 1101 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1102 error = EPERM; 1103 goto out; 1104 } 1105 1106 1107 /* Detach the directory entry from the directory (dnode). */ 1108 tmpfs_dir_detach(dvp, de); 1109 if (v->a_cnp->cn_flags & DOWHITEOUT) 1110 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1111 1112 /* No vnode should be allocated for this entry from this point */ 1113 TMPFS_NODE_LOCK(node); 1114 node->tn_links--; 1115 node->tn_dir.tn_parent = NULL; 1116 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1117 TMPFS_NODE_MODIFIED; 1118 1119 TMPFS_NODE_UNLOCK(node); 1120 1121 TMPFS_NODE_LOCK(dnode); 1122 dnode->tn_links--; 1123 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1124 TMPFS_NODE_MODIFIED; 1125 TMPFS_NODE_UNLOCK(dnode); 1126 1127 cache_purge(dvp); 1128 cache_purge(vp); 1129 1130 /* Free the directory entry we just deleted. Note that the node 1131 * referred by it will not be removed until the vnode is really 1132 * reclaimed. */ 1133 tmpfs_free_dirent(tmp, de); 1134 1135 /* Release the deleted vnode (will destroy the node, notify 1136 * interested parties and clean it from the cache). */ 1137 1138 dnode->tn_status |= TMPFS_NODE_CHANGED; 1139 tmpfs_update(dvp); 1140 1141 error = 0; 1142 1143out: 1144 return error; 1145} 1146 1147static int 1148tmpfs_symlink(struct vop_symlink_args *v) 1149{ 1150 struct vnode *dvp = v->a_dvp; 1151 struct vnode **vpp = v->a_vpp; 1152 struct componentname *cnp = v->a_cnp; 1153 struct vattr *vap = v->a_vap; 1154 char *target = v->a_target; 1155 1156#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1157 MPASS(vap->va_type == VLNK); 1158#else 1159 vap->va_type = VLNK; 1160#endif 1161 1162 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1163} 1164 1165static int 1166tmpfs_readdir(struct vop_readdir_args *v) 1167{ 1168 struct vnode *vp = v->a_vp; 1169 struct uio *uio = v->a_uio; 1170 int *eofflag = v->a_eofflag; 1171 u_long **cookies = v->a_cookies; 1172 int *ncookies = v->a_ncookies; 1173 1174 int error; 1175 ssize_t startresid; 1176 int maxcookies; 1177 struct tmpfs_node *node; 1178 1179 /* This operation only makes sense on directory nodes. */ 1180 if (vp->v_type != VDIR) 1181 return ENOTDIR; 1182 1183 maxcookies = 0; 1184 node = VP_TO_TMPFS_DIR(vp); 1185 1186 startresid = uio->uio_resid; 1187 1188 /* Allocate cookies for NFS and compat modules. */ 1189 if (cookies != NULL && ncookies != NULL) { 1190 maxcookies = howmany(node->tn_size, 1191 sizeof(struct tmpfs_dirent)) + 2; 1192 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1193 M_WAITOK); 1194 *ncookies = 0; 1195 } 1196 1197 if (cookies == NULL) 1198 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1199 else 1200 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1201 ncookies); 1202 1203 /* Buffer was filled without hitting EOF. */ 1204 if (error == EJUSTRETURN) 1205 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1206 1207 if (error != 0 && cookies != NULL && ncookies != NULL) { 1208 free(*cookies, M_TEMP); 1209 *cookies = NULL; 1210 *ncookies = 0; 1211 } 1212 1213 if (eofflag != NULL) 1214 *eofflag = 1215 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1216 1217 return error; 1218} 1219 1220static int 1221tmpfs_readlink(struct vop_readlink_args *v) 1222{ 1223 struct vnode *vp = v->a_vp; 1224 struct uio *uio = v->a_uio; 1225 1226 int error; 1227 struct tmpfs_node *node; 1228 1229 MPASS(uio->uio_offset == 0); 1230 MPASS(vp->v_type == VLNK); 1231 1232 node = VP_TO_TMPFS_NODE(vp); 1233 1234 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1235 uio); 1236 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1237 1238 return (error); 1239} 1240 1241static int 1242tmpfs_inactive(struct vop_inactive_args *v) 1243{ 1244 struct vnode *vp; 1245 struct tmpfs_node *node; 1246 1247 vp = v->a_vp; 1248 node = VP_TO_TMPFS_NODE(vp); 1249 if (node->tn_links == 0) 1250 vrecycle(vp); 1251 else 1252 tmpfs_check_mtime(vp); 1253 return (0); 1254} 1255 1256int 1257tmpfs_reclaim(struct vop_reclaim_args *v) 1258{ 1259 struct vnode *vp = v->a_vp; 1260 1261 struct tmpfs_mount *tmp; 1262 struct tmpfs_node *node; 1263 1264 node = VP_TO_TMPFS_NODE(vp); 1265 tmp = VFS_TO_TMPFS(vp->v_mount); 1266 1267 if (vp->v_type == VREG) 1268 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1269 else 1270 vnode_destroy_vobject(vp); 1271 vp->v_object = NULL; 1272 cache_purge(vp); 1273 1274 TMPFS_NODE_LOCK(node); 1275 tmpfs_free_vp(vp); 1276 1277 /* If the node referenced by this vnode was deleted by the user, 1278 * we must free its associated data structures (now that the vnode 1279 * is being reclaimed). */ 1280 if (node->tn_links == 0 && 1281 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1282 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1283 TMPFS_NODE_UNLOCK(node); 1284 tmpfs_free_node(tmp, node); 1285 } else 1286 TMPFS_NODE_UNLOCK(node); 1287 1288 MPASS(vp->v_data == NULL); 1289 return 0; 1290} 1291 1292static int 1293tmpfs_print(struct vop_print_args *v) 1294{ 1295 struct vnode *vp = v->a_vp; 1296 1297 struct tmpfs_node *node; 1298 1299 node = VP_TO_TMPFS_NODE(vp); 1300 1301 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1302 node, node->tn_flags, (uintmax_t)node->tn_links); 1303 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1304 node->tn_mode, node->tn_uid, node->tn_gid, 1305 (intmax_t)node->tn_size, node->tn_status); 1306 1307 if (vp->v_type == VFIFO) 1308 fifo_printinfo(vp); 1309 1310 printf("\n"); 1311 1312 return 0; 1313} 1314 1315static int 1316tmpfs_pathconf(struct vop_pathconf_args *v) 1317{ 1318 int name = v->a_name; 1319 register_t *retval = v->a_retval; 1320 1321 int error; 1322 1323 error = 0; 1324 1325 switch (name) { 1326 case _PC_LINK_MAX: 1327 *retval = LINK_MAX; 1328 break; 1329 1330 case _PC_NAME_MAX: 1331 *retval = NAME_MAX; 1332 break; 1333 1334 case _PC_PATH_MAX: 1335 *retval = PATH_MAX; 1336 break; 1337 1338 case _PC_PIPE_BUF: 1339 *retval = PIPE_BUF; 1340 break; 1341 1342 case _PC_CHOWN_RESTRICTED: 1343 *retval = 1; 1344 break; 1345 1346 case _PC_NO_TRUNC: 1347 *retval = 1; 1348 break; 1349 1350 case _PC_SYNC_IO: 1351 *retval = 1; 1352 break; 1353 1354 case _PC_FILESIZEBITS: 1355 *retval = 0; /* XXX Don't know which value should I return. */ 1356 break; 1357 1358 default: 1359 error = EINVAL; 1360 } 1361 1362 return error; 1363} 1364 1365static int 1366tmpfs_vptofh(struct vop_vptofh_args *ap) 1367{ 1368 struct tmpfs_fid *tfhp; 1369 struct tmpfs_node *node; 1370 1371 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1372 node = VP_TO_TMPFS_NODE(ap->a_vp); 1373 1374 tfhp->tf_len = sizeof(struct tmpfs_fid); 1375 tfhp->tf_id = node->tn_id; 1376 tfhp->tf_gen = node->tn_gen; 1377 1378 return (0); 1379} 1380 1381static int 1382tmpfs_whiteout(struct vop_whiteout_args *ap) 1383{ 1384 struct vnode *dvp = ap->a_dvp; 1385 struct componentname *cnp = ap->a_cnp; 1386 struct tmpfs_dirent *de; 1387 1388 switch (ap->a_flags) { 1389 case LOOKUP: 1390 return (0); 1391 case CREATE: 1392 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1393 if (de != NULL) 1394 return (de->td_node == NULL ? 0 : EEXIST); 1395 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1396 case DELETE: 1397 tmpfs_dir_whiteout_remove(dvp, cnp); 1398 return (0); 1399 default: 1400 panic("tmpfs_whiteout: unknown op"); 1401 } 1402} 1403 1404/* 1405 * Vnode operations vector used for files stored in a tmpfs file system. 1406 */ 1407struct vop_vector tmpfs_vnodeop_entries = { 1408 .vop_default = &default_vnodeops, 1409 .vop_lookup = vfs_cache_lookup, 1410 .vop_cachedlookup = tmpfs_lookup, 1411 .vop_create = tmpfs_create, 1412 .vop_mknod = tmpfs_mknod, 1413 .vop_open = tmpfs_open, 1414 .vop_close = tmpfs_close, 1415 .vop_access = tmpfs_access, 1416 .vop_getattr = tmpfs_getattr, 1417 .vop_setattr = tmpfs_setattr, 1418 .vop_read = tmpfs_read, 1419 .vop_write = tmpfs_write, 1420 .vop_fsync = tmpfs_fsync, 1421 .vop_remove = tmpfs_remove, 1422 .vop_link = tmpfs_link, 1423 .vop_rename = tmpfs_rename, 1424 .vop_mkdir = tmpfs_mkdir, 1425 .vop_rmdir = tmpfs_rmdir, 1426 .vop_symlink = tmpfs_symlink, 1427 .vop_readdir = tmpfs_readdir, 1428 .vop_readlink = tmpfs_readlink, 1429 .vop_inactive = tmpfs_inactive, 1430 .vop_reclaim = tmpfs_reclaim, 1431 .vop_print = tmpfs_print, 1432 .vop_pathconf = tmpfs_pathconf, 1433 .vop_vptofh = tmpfs_vptofh, 1434 .vop_whiteout = tmpfs_whiteout, 1435 .vop_bmap = VOP_EOPNOTSUPP, 1436}; 1437 1438