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("$FreeBSD$"); 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 63 SYSCTL_DECL(_vfs_tmpfs); 64 65 static volatile int tmpfs_rename_restarts; 66 SYSCTL_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 70 static int 71 tmpfs_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 78 static int 79 tmpfs_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 /* The entry was not found in the directory. 121 * This is OK if we are creating or renaming an 122 * entry and are working on the last component of 123 * the path name. */ 124 if ((cnp->cn_flags & ISLASTCN) && 125 (cnp->cn_nameiop == CREATE || \ 126 cnp->cn_nameiop == RENAME || 127 (cnp->cn_nameiop == DELETE && 128 cnp->cn_flags & DOWHITEOUT && 129 cnp->cn_flags & ISWHITEOUT))) { 130 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 131 cnp->cn_thread); 132 if (error != 0) 133 goto out; 134 135 /* Keep the component name in the buffer for 136 * future uses. */ 137 cnp->cn_flags |= SAVENAME; 138 139 error = EJUSTRETURN; 140 } else 141 error = ENOENT; 142 } else { 143 struct tmpfs_node *tnode; 144 145 /* The entry was found, so get its associated 146 * tmpfs_node. */ 147 tnode = de->td_node; 148 149 /* If we are not at the last path component and 150 * found a non-directory or non-link entry (which 151 * may itself be pointing to a directory), raise 152 * an error. */ 153 if ((tnode->tn_type != VDIR && 154 tnode->tn_type != VLNK) && 155 !(cnp->cn_flags & ISLASTCN)) { 156 error = ENOTDIR; 157 goto out; 158 } 159 160 /* If we are deleting or renaming the entry, keep 161 * track of its tmpfs_dirent so that it can be 162 * easily deleted later. */ 163 if ((cnp->cn_flags & ISLASTCN) && 164 (cnp->cn_nameiop == DELETE || 165 cnp->cn_nameiop == RENAME)) { 166 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 167 cnp->cn_thread); 168 if (error != 0) 169 goto out; 170 171 /* Allocate a new vnode on the matching entry. */ 172 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 173 cnp->cn_lkflags, vpp); 174 if (error != 0) 175 goto out; 176 177 if ((dnode->tn_mode & S_ISTXT) && 178 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 179 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 180 error = EPERM; 181 vput(*vpp); 182 *vpp = NULL; 183 goto out; 184 } 185 cnp->cn_flags |= SAVENAME; 186 } else { 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp); 189 if (error != 0) 190 goto out; 191 } 192 } 193 } 194 195 /* Store the result of this lookup in the cache. Avoid this if the 196 * request was for creation, as it does not improve timings on 197 * emprical tests. */ 198 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 199 cache_enter(dvp, *vpp, cnp); 200 201 out: 202 /* If there were no errors, *vpp cannot be null and it must be 203 * locked. */ 204 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 205 206 return error; 207 } 208 209 static int 210 tmpfs_create(struct vop_create_args *v) 211 { 212 struct vnode *dvp = v->a_dvp; 213 struct vnode **vpp = v->a_vpp; 214 struct componentname *cnp = v->a_cnp; 215 struct vattr *vap = v->a_vap; 216 217 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 218 219 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 220 } 221 222 static int 223 tmpfs_mknod(struct vop_mknod_args *v) 224 { 225 struct vnode *dvp = v->a_dvp; 226 struct vnode **vpp = v->a_vpp; 227 struct componentname *cnp = v->a_cnp; 228 struct vattr *vap = v->a_vap; 229 230 if (vap->va_type != VBLK && vap->va_type != VCHR && 231 vap->va_type != VFIFO) 232 return EINVAL; 233 234 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 235 } 236 237 static int 238 tmpfs_open(struct vop_open_args *v) 239 { 240 struct vnode *vp = v->a_vp; 241 int mode = v->a_mode; 242 243 int error; 244 struct tmpfs_node *node; 245 246 MPASS(VOP_ISLOCKED(vp)); 247 248 node = VP_TO_TMPFS_NODE(vp); 249 250 /* The file is still active but all its names have been removed 251 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 252 * it is about to die. */ 253 if (node->tn_links < 1) 254 return (ENOENT); 255 256 /* If the file is marked append-only, deny write requests. */ 257 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 258 error = EPERM; 259 else { 260 error = 0; 261 /* For regular files, the call below is nop. */ 262 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 263 OBJ_DEAD) == 0, ("dead object")); 264 vnode_create_vobject(vp, node->tn_size, v->a_td); 265 } 266 267 MPASS(VOP_ISLOCKED(vp)); 268 return error; 269 } 270 271 static int 272 tmpfs_close(struct vop_close_args *v) 273 { 274 struct vnode *vp = v->a_vp; 275 276 /* Update node times. */ 277 tmpfs_update(vp); 278 279 return (0); 280 } 281 282 int 283 tmpfs_access(struct vop_access_args *v) 284 { 285 struct vnode *vp = v->a_vp; 286 accmode_t accmode = v->a_accmode; 287 struct ucred *cred = v->a_cred; 288 289 int error; 290 struct tmpfs_node *node; 291 292 MPASS(VOP_ISLOCKED(vp)); 293 294 node = VP_TO_TMPFS_NODE(vp); 295 296 switch (vp->v_type) { 297 case VDIR: 298 /* FALLTHROUGH */ 299 case VLNK: 300 /* FALLTHROUGH */ 301 case VREG: 302 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 303 error = EROFS; 304 goto out; 305 } 306 break; 307 308 case VBLK: 309 /* FALLTHROUGH */ 310 case VCHR: 311 /* FALLTHROUGH */ 312 case VSOCK: 313 /* FALLTHROUGH */ 314 case VFIFO: 315 break; 316 317 default: 318 error = EINVAL; 319 goto out; 320 } 321 322 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 323 error = EPERM; 324 goto out; 325 } 326 327 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 328 node->tn_gid, accmode, cred, NULL); 329 330 out: 331 MPASS(VOP_ISLOCKED(vp)); 332 333 return error; 334 } 335 336 int 337 tmpfs_getattr(struct vop_getattr_args *v) 338 { 339 struct vnode *vp = v->a_vp; 340 struct vattr *vap = v->a_vap; 341 342 struct tmpfs_node *node; 343 344 node = VP_TO_TMPFS_NODE(vp); 345 346 tmpfs_update(vp); 347 348 vap->va_type = vp->v_type; 349 vap->va_mode = node->tn_mode; 350 vap->va_nlink = node->tn_links; 351 vap->va_uid = node->tn_uid; 352 vap->va_gid = node->tn_gid; 353 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 354 vap->va_fileid = node->tn_id; 355 vap->va_size = node->tn_size; 356 vap->va_blocksize = PAGE_SIZE; 357 vap->va_atime = node->tn_atime; 358 vap->va_mtime = node->tn_mtime; 359 vap->va_ctime = node->tn_ctime; 360 vap->va_birthtime = node->tn_birthtime; 361 vap->va_gen = node->tn_gen; 362 vap->va_flags = node->tn_flags; 363 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 364 node->tn_rdev : NODEV; 365 vap->va_bytes = round_page(node->tn_size); 366 vap->va_filerev = 0; 367 368 return 0; 369 } 370 371 int 372 tmpfs_setattr(struct vop_setattr_args *v) 373 { 374 struct vnode *vp = v->a_vp; 375 struct vattr *vap = v->a_vap; 376 struct ucred *cred = v->a_cred; 377 struct thread *td = curthread; 378 379 int error; 380 381 MPASS(VOP_ISLOCKED(vp)); 382 383 error = 0; 384 385 /* Abort if any unsettable attribute is given. */ 386 if (vap->va_type != VNON || 387 vap->va_nlink != VNOVAL || 388 vap->va_fsid != VNOVAL || 389 vap->va_fileid != VNOVAL || 390 vap->va_blocksize != VNOVAL || 391 vap->va_gen != VNOVAL || 392 vap->va_rdev != VNOVAL || 393 vap->va_bytes != VNOVAL) 394 error = EINVAL; 395 396 if (error == 0 && (vap->va_flags != VNOVAL)) 397 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 398 399 if (error == 0 && (vap->va_size != VNOVAL)) 400 error = tmpfs_chsize(vp, vap->va_size, cred, td); 401 402 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 403 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 404 405 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 406 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 407 408 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 409 vap->va_atime.tv_nsec != VNOVAL) || 410 (vap->va_mtime.tv_sec != VNOVAL && 411 vap->va_mtime.tv_nsec != VNOVAL) || 412 (vap->va_birthtime.tv_sec != VNOVAL && 413 vap->va_birthtime.tv_nsec != VNOVAL))) 414 error = tmpfs_chtimes(vp, vap, cred, td); 415 416 /* Update the node times. We give preference to the error codes 417 * generated by this function rather than the ones that may arise 418 * from tmpfs_update. */ 419 tmpfs_update(vp); 420 421 MPASS(VOP_ISLOCKED(vp)); 422 423 return error; 424 } 425 426 static int 427 tmpfs_read(struct vop_read_args *v) 428 { 429 struct vnode *vp; 430 struct uio *uio; 431 struct tmpfs_node *node; 432 433 vp = v->a_vp; 434 if (vp->v_type != VREG) 435 return (EISDIR); 436 uio = v->a_uio; 437 if (uio->uio_offset < 0) 438 return (EINVAL); 439 node = VP_TO_TMPFS_NODE(vp); 440 node->tn_status |= TMPFS_NODE_ACCESSED; 441 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 442 } 443 444 static int 445 tmpfs_write(struct vop_write_args *v) 446 { 447 struct vnode *vp; 448 struct uio *uio; 449 struct tmpfs_node *node; 450 off_t oldsize; 451 int error, ioflag; 452 boolean_t extended; 453 454 vp = v->a_vp; 455 uio = v->a_uio; 456 ioflag = v->a_ioflag; 457 error = 0; 458 node = VP_TO_TMPFS_NODE(vp); 459 oldsize = node->tn_size; 460 461 if (uio->uio_offset < 0 || vp->v_type != VREG) 462 return (EINVAL); 463 if (uio->uio_resid == 0) 464 return (0); 465 if (ioflag & IO_APPEND) 466 uio->uio_offset = node->tn_size; 467 if (uio->uio_offset + uio->uio_resid > 468 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 469 return (EFBIG); 470 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 471 return (EFBIG); 472 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 473 if (extended) { 474 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 475 FALSE); 476 if (error != 0) 477 goto out; 478 } 479 480 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 481 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 482 (extended ? TMPFS_NODE_CHANGED : 0); 483 if (node->tn_mode & (S_ISUID | S_ISGID)) { 484 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 485 node->tn_mode &= ~(S_ISUID | S_ISGID); 486 } 487 if (error != 0) 488 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 489 490 out: 491 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 492 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 493 494 return (error); 495 } 496 497 static int 498 tmpfs_fsync(struct vop_fsync_args *v) 499 { 500 struct vnode *vp = v->a_vp; 501 502 MPASS(VOP_ISLOCKED(vp)); 503 504 tmpfs_update(vp); 505 506 return 0; 507 } 508 509 static int 510 tmpfs_remove(struct vop_remove_args *v) 511 { 512 struct vnode *dvp = v->a_dvp; 513 struct vnode *vp = v->a_vp; 514 515 int error; 516 struct tmpfs_dirent *de; 517 struct tmpfs_mount *tmp; 518 struct tmpfs_node *dnode; 519 struct tmpfs_node *node; 520 521 MPASS(VOP_ISLOCKED(dvp)); 522 MPASS(VOP_ISLOCKED(vp)); 523 524 if (vp->v_type == VDIR) { 525 error = EISDIR; 526 goto out; 527 } 528 529 dnode = VP_TO_TMPFS_DIR(dvp); 530 node = VP_TO_TMPFS_NODE(vp); 531 tmp = VFS_TO_TMPFS(vp->v_mount); 532 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 533 MPASS(de != NULL); 534 535 /* Files marked as immutable or append-only cannot be deleted. */ 536 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 537 (dnode->tn_flags & APPEND)) { 538 error = EPERM; 539 goto out; 540 } 541 542 /* Remove the entry from the directory; as it is a file, we do not 543 * have to change the number of hard links of the directory. */ 544 tmpfs_dir_detach(dvp, de); 545 if (v->a_cnp->cn_flags & DOWHITEOUT) 546 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 547 548 /* Free the directory entry we just deleted. Note that the node 549 * referred by it will not be removed until the vnode is really 550 * reclaimed. */ 551 tmpfs_free_dirent(tmp, de); 552 553 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 554 error = 0; 555 556 out: 557 558 return error; 559 } 560 561 static int 562 tmpfs_link(struct vop_link_args *v) 563 { 564 struct vnode *dvp = v->a_tdvp; 565 struct vnode *vp = v->a_vp; 566 struct componentname *cnp = v->a_cnp; 567 568 int error; 569 struct tmpfs_dirent *de; 570 struct tmpfs_node *node; 571 572 MPASS(VOP_ISLOCKED(dvp)); 573 MPASS(cnp->cn_flags & HASBUF); 574 MPASS(dvp != vp); /* XXX When can this be false? */ 575 node = VP_TO_TMPFS_NODE(vp); 576 577 /* Ensure that we do not overflow the maximum number of links imposed 578 * by the system. */ 579 MPASS(node->tn_links <= LINK_MAX); 580 if (node->tn_links == LINK_MAX) { 581 error = EMLINK; 582 goto out; 583 } 584 585 /* We cannot create links of files marked immutable or append-only. */ 586 if (node->tn_flags & (IMMUTABLE | APPEND)) { 587 error = EPERM; 588 goto out; 589 } 590 591 /* Allocate a new directory entry to represent the node. */ 592 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 593 cnp->cn_nameptr, cnp->cn_namelen, &de); 594 if (error != 0) 595 goto out; 596 597 /* Insert the new directory entry into the appropriate directory. */ 598 if (cnp->cn_flags & ISWHITEOUT) 599 tmpfs_dir_whiteout_remove(dvp, cnp); 600 tmpfs_dir_attach(dvp, de); 601 602 /* vp link count has changed, so update node times. */ 603 node->tn_status |= TMPFS_NODE_CHANGED; 604 tmpfs_update(vp); 605 606 error = 0; 607 608 out: 609 return error; 610 } 611 612 /* 613 * We acquire all but fdvp locks using non-blocking acquisitions. If we 614 * fail to acquire any lock in the path we will drop all held locks, 615 * acquire the new lock in a blocking fashion, and then release it and 616 * restart the rename. This acquire/release step ensures that we do not 617 * spin on a lock waiting for release. On error release all vnode locks 618 * and decrement references the way tmpfs_rename() would do. 619 */ 620 static int 621 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 622 struct vnode *tdvp, struct vnode **tvpp, 623 struct componentname *fcnp, struct componentname *tcnp) 624 { 625 struct vnode *nvp; 626 struct mount *mp; 627 struct tmpfs_dirent *de; 628 int error, restarts = 0; 629 630 VOP_UNLOCK(tdvp, 0); 631 if (*tvpp != NULL && *tvpp != tdvp) 632 VOP_UNLOCK(*tvpp, 0); 633 mp = fdvp->v_mount; 634 635 relock: 636 restarts += 1; 637 error = vn_lock(fdvp, LK_EXCLUSIVE); 638 if (error) 639 goto releout; 640 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 641 VOP_UNLOCK(fdvp, 0); 642 error = vn_lock(tdvp, LK_EXCLUSIVE); 643 if (error) 644 goto releout; 645 VOP_UNLOCK(tdvp, 0); 646 goto relock; 647 } 648 /* 649 * Re-resolve fvp to be certain it still exists and fetch the 650 * correct vnode. 651 */ 652 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 653 if (de == NULL) { 654 VOP_UNLOCK(fdvp, 0); 655 VOP_UNLOCK(tdvp, 0); 656 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 657 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 658 error = EINVAL; 659 else 660 error = ENOENT; 661 goto releout; 662 } 663 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 664 if (error != 0) { 665 VOP_UNLOCK(fdvp, 0); 666 VOP_UNLOCK(tdvp, 0); 667 if (error != EBUSY) 668 goto releout; 669 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 670 if (error != 0) 671 goto releout; 672 VOP_UNLOCK(nvp, 0); 673 /* 674 * Concurrent rename race. 675 */ 676 if (nvp == tdvp) { 677 vrele(nvp); 678 error = EINVAL; 679 goto releout; 680 } 681 vrele(*fvpp); 682 *fvpp = nvp; 683 goto relock; 684 } 685 vrele(*fvpp); 686 *fvpp = nvp; 687 VOP_UNLOCK(*fvpp, 0); 688 /* 689 * Re-resolve tvp and acquire the vnode lock if present. 690 */ 691 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 692 /* 693 * If tvp disappeared we just carry on. 694 */ 695 if (de == NULL && *tvpp != NULL) { 696 vrele(*tvpp); 697 *tvpp = NULL; 698 } 699 /* 700 * Get the tvp ino if the lookup succeeded. We may have to restart 701 * if the non-blocking acquire fails. 702 */ 703 if (de != NULL) { 704 nvp = NULL; 705 error = tmpfs_alloc_vp(mp, de->td_node, 706 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 707 if (*tvpp != NULL) 708 vrele(*tvpp); 709 *tvpp = nvp; 710 if (error != 0) { 711 VOP_UNLOCK(fdvp, 0); 712 VOP_UNLOCK(tdvp, 0); 713 if (error != EBUSY) 714 goto releout; 715 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 716 &nvp); 717 if (error != 0) 718 goto releout; 719 VOP_UNLOCK(nvp, 0); 720 /* 721 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 722 */ 723 if (nvp == fdvp) { 724 error = ENOTEMPTY; 725 goto releout; 726 } 727 goto relock; 728 } 729 } 730 tmpfs_rename_restarts += restarts; 731 732 return (0); 733 734 releout: 735 vrele(fdvp); 736 vrele(*fvpp); 737 vrele(tdvp); 738 if (*tvpp != NULL) 739 vrele(*tvpp); 740 tmpfs_rename_restarts += restarts; 741 742 return (error); 743 } 744 745 static int 746 tmpfs_rename(struct vop_rename_args *v) 747 { 748 struct vnode *fdvp = v->a_fdvp; 749 struct vnode *fvp = v->a_fvp; 750 struct componentname *fcnp = v->a_fcnp; 751 struct vnode *tdvp = v->a_tdvp; 752 struct vnode *tvp = v->a_tvp; 753 struct componentname *tcnp = v->a_tcnp; 754 struct mount *mp = NULL; 755 756 char *newname; 757 int error; 758 struct tmpfs_dirent *de; 759 struct tmpfs_mount *tmp; 760 struct tmpfs_node *fdnode; 761 struct tmpfs_node *fnode; 762 struct tmpfs_node *tnode; 763 struct tmpfs_node *tdnode; 764 765 MPASS(VOP_ISLOCKED(tdvp)); 766 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 767 MPASS(fcnp->cn_flags & HASBUF); 768 MPASS(tcnp->cn_flags & HASBUF); 769 770 /* Disallow cross-device renames. 771 * XXX Why isn't this done by the caller? */ 772 if (fvp->v_mount != tdvp->v_mount || 773 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 774 error = EXDEV; 775 goto out; 776 } 777 778 /* If source and target are the same file, there is nothing to do. */ 779 if (fvp == tvp) { 780 error = 0; 781 goto out; 782 } 783 784 /* If we need to move the directory between entries, lock the 785 * source so that we can safely operate on it. */ 786 if (fdvp != tdvp && fdvp != tvp) { 787 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 788 mp = tdvp->v_mount; 789 error = vfs_busy(mp, 0); 790 if (error != 0) { 791 mp = NULL; 792 goto out; 793 } 794 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 795 fcnp, tcnp); 796 if (error != 0) { 797 vfs_unbusy(mp); 798 return (error); 799 } 800 ASSERT_VOP_ELOCKED(fdvp, 801 "tmpfs_rename: fdvp not locked"); 802 ASSERT_VOP_ELOCKED(tdvp, 803 "tmpfs_rename: tdvp not locked"); 804 if (tvp != NULL) 805 ASSERT_VOP_ELOCKED(tvp, 806 "tmpfs_rename: tvp not locked"); 807 if (fvp == tvp) { 808 error = 0; 809 goto out_locked; 810 } 811 } 812 } 813 814 tmp = VFS_TO_TMPFS(tdvp->v_mount); 815 tdnode = VP_TO_TMPFS_DIR(tdvp); 816 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 817 fdnode = VP_TO_TMPFS_DIR(fdvp); 818 fnode = VP_TO_TMPFS_NODE(fvp); 819 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 820 821 /* Entry can disappear before we lock fdvp, 822 * also avoid manipulating '.' and '..' entries. */ 823 if (de == NULL) { 824 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 825 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 826 error = EINVAL; 827 else 828 error = ENOENT; 829 goto out_locked; 830 } 831 MPASS(de->td_node == fnode); 832 833 /* If re-naming a directory to another preexisting directory 834 * ensure that the target directory is empty so that its 835 * removal causes no side effects. 836 * Kern_rename gurantees the destination to be a directory 837 * if the source is one. */ 838 if (tvp != NULL) { 839 MPASS(tnode != NULL); 840 841 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 842 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 843 error = EPERM; 844 goto out_locked; 845 } 846 847 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 848 if (tnode->tn_size > 0) { 849 error = ENOTEMPTY; 850 goto out_locked; 851 } 852 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 853 error = ENOTDIR; 854 goto out_locked; 855 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 856 error = EISDIR; 857 goto out_locked; 858 } else { 859 MPASS(fnode->tn_type != VDIR && 860 tnode->tn_type != VDIR); 861 } 862 } 863 864 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 865 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 866 error = EPERM; 867 goto out_locked; 868 } 869 870 /* Ensure that we have enough memory to hold the new name, if it 871 * has to be changed. */ 872 if (fcnp->cn_namelen != tcnp->cn_namelen || 873 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 874 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 875 } else 876 newname = NULL; 877 878 /* If the node is being moved to another directory, we have to do 879 * the move. */ 880 if (fdnode != tdnode) { 881 /* In case we are moving a directory, we have to adjust its 882 * parent to point to the new parent. */ 883 if (de->td_node->tn_type == VDIR) { 884 struct tmpfs_node *n; 885 886 /* Ensure the target directory is not a child of the 887 * directory being moved. Otherwise, we'd end up 888 * with stale nodes. */ 889 n = tdnode; 890 /* TMPFS_LOCK garanties that no nodes are freed while 891 * traversing the list. Nodes can only be marked as 892 * removed: tn_parent == NULL. */ 893 TMPFS_LOCK(tmp); 894 TMPFS_NODE_LOCK(n); 895 while (n != n->tn_dir.tn_parent) { 896 struct tmpfs_node *parent; 897 898 if (n == fnode) { 899 TMPFS_NODE_UNLOCK(n); 900 TMPFS_UNLOCK(tmp); 901 error = EINVAL; 902 if (newname != NULL) 903 free(newname, M_TMPFSNAME); 904 goto out_locked; 905 } 906 parent = n->tn_dir.tn_parent; 907 TMPFS_NODE_UNLOCK(n); 908 if (parent == NULL) { 909 n = NULL; 910 break; 911 } 912 TMPFS_NODE_LOCK(parent); 913 if (parent->tn_dir.tn_parent == NULL) { 914 TMPFS_NODE_UNLOCK(parent); 915 n = NULL; 916 break; 917 } 918 n = parent; 919 } 920 TMPFS_UNLOCK(tmp); 921 if (n == NULL) { 922 error = EINVAL; 923 if (newname != NULL) 924 free(newname, M_TMPFSNAME); 925 goto out_locked; 926 } 927 TMPFS_NODE_UNLOCK(n); 928 929 /* Adjust the parent pointer. */ 930 TMPFS_VALIDATE_DIR(fnode); 931 TMPFS_NODE_LOCK(de->td_node); 932 de->td_node->tn_dir.tn_parent = tdnode; 933 TMPFS_NODE_UNLOCK(de->td_node); 934 935 /* As a result of changing the target of the '..' 936 * entry, the link count of the source and target 937 * directories has to be adjusted. */ 938 TMPFS_NODE_LOCK(tdnode); 939 TMPFS_ASSERT_LOCKED(tdnode); 940 tdnode->tn_links++; 941 TMPFS_NODE_UNLOCK(tdnode); 942 943 TMPFS_NODE_LOCK(fdnode); 944 TMPFS_ASSERT_LOCKED(fdnode); 945 fdnode->tn_links--; 946 TMPFS_NODE_UNLOCK(fdnode); 947 } 948 } 949 950 /* Do the move: just remove the entry from the source directory 951 * and insert it into the target one. */ 952 tmpfs_dir_detach(fdvp, de); 953 954 if (fcnp->cn_flags & DOWHITEOUT) 955 tmpfs_dir_whiteout_add(fdvp, fcnp); 956 if (tcnp->cn_flags & ISWHITEOUT) 957 tmpfs_dir_whiteout_remove(tdvp, tcnp); 958 959 /* If the name has changed, we need to make it effective by changing 960 * it in the directory entry. */ 961 if (newname != NULL) { 962 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 963 964 free(de->ud.td_name, M_TMPFSNAME); 965 de->ud.td_name = newname; 966 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 967 968 fnode->tn_status |= TMPFS_NODE_CHANGED; 969 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 970 } 971 972 /* If we are overwriting an entry, we have to remove the old one 973 * from the target directory. */ 974 if (tvp != NULL) { 975 struct tmpfs_dirent *tde; 976 977 /* Remove the old entry from the target directory. */ 978 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 979 tmpfs_dir_detach(tdvp, tde); 980 981 /* Free the directory entry we just deleted. Note that the 982 * node referred by it will not be removed until the vnode is 983 * really reclaimed. */ 984 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 985 } 986 987 tmpfs_dir_attach(tdvp, de); 988 989 cache_purge(fvp); 990 if (tvp != NULL) 991 cache_purge(tvp); 992 cache_purge_negative(tdvp); 993 994 error = 0; 995 996 out_locked: 997 if (fdvp != tdvp && fdvp != tvp) 998 VOP_UNLOCK(fdvp, 0); 999 1000 out: 1001 /* Release target nodes. */ 1002 /* XXX: I don't understand when tdvp can be the same as tvp, but 1003 * other code takes care of this... */ 1004 if (tdvp == tvp) 1005 vrele(tdvp); 1006 else 1007 vput(tdvp); 1008 if (tvp != NULL) 1009 vput(tvp); 1010 1011 /* Release source nodes. */ 1012 vrele(fdvp); 1013 vrele(fvp); 1014 1015 if (mp != NULL) 1016 vfs_unbusy(mp); 1017 1018 return error; 1019 } 1020 1021 static int 1022 tmpfs_mkdir(struct vop_mkdir_args *v) 1023 { 1024 struct vnode *dvp = v->a_dvp; 1025 struct vnode **vpp = v->a_vpp; 1026 struct componentname *cnp = v->a_cnp; 1027 struct vattr *vap = v->a_vap; 1028 1029 MPASS(vap->va_type == VDIR); 1030 1031 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1032 } 1033 1034 static int 1035 tmpfs_rmdir(struct vop_rmdir_args *v) 1036 { 1037 struct vnode *dvp = v->a_dvp; 1038 struct vnode *vp = v->a_vp; 1039 1040 int error; 1041 struct tmpfs_dirent *de; 1042 struct tmpfs_mount *tmp; 1043 struct tmpfs_node *dnode; 1044 struct tmpfs_node *node; 1045 1046 MPASS(VOP_ISLOCKED(dvp)); 1047 MPASS(VOP_ISLOCKED(vp)); 1048 1049 tmp = VFS_TO_TMPFS(dvp->v_mount); 1050 dnode = VP_TO_TMPFS_DIR(dvp); 1051 node = VP_TO_TMPFS_DIR(vp); 1052 1053 /* Directories with more than two entries ('.' and '..') cannot be 1054 * removed. */ 1055 if (node->tn_size > 0) { 1056 error = ENOTEMPTY; 1057 goto out; 1058 } 1059 1060 if ((dnode->tn_flags & APPEND) 1061 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1062 error = EPERM; 1063 goto out; 1064 } 1065 1066 /* This invariant holds only if we are not trying to remove "..". 1067 * We checked for that above so this is safe now. */ 1068 MPASS(node->tn_dir.tn_parent == dnode); 1069 1070 /* Get the directory entry associated with node (vp). This was 1071 * filled by tmpfs_lookup while looking up the entry. */ 1072 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1073 MPASS(TMPFS_DIRENT_MATCHES(de, 1074 v->a_cnp->cn_nameptr, 1075 v->a_cnp->cn_namelen)); 1076 1077 /* Check flags to see if we are allowed to remove the directory. */ 1078 if (dnode->tn_flags & APPEND 1079 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1080 error = EPERM; 1081 goto out; 1082 } 1083 1084 1085 /* Detach the directory entry from the directory (dnode). */ 1086 tmpfs_dir_detach(dvp, de); 1087 if (v->a_cnp->cn_flags & DOWHITEOUT) 1088 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1089 1090 /* No vnode should be allocated for this entry from this point */ 1091 TMPFS_NODE_LOCK(node); 1092 TMPFS_ASSERT_ELOCKED(node); 1093 node->tn_links--; 1094 node->tn_dir.tn_parent = NULL; 1095 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1096 TMPFS_NODE_MODIFIED; 1097 1098 TMPFS_NODE_UNLOCK(node); 1099 1100 TMPFS_NODE_LOCK(dnode); 1101 TMPFS_ASSERT_ELOCKED(dnode); 1102 dnode->tn_links--; 1103 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1104 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1105 TMPFS_NODE_UNLOCK(dnode); 1106 1107 cache_purge(dvp); 1108 cache_purge(vp); 1109 1110 /* Free the directory entry we just deleted. Note that the node 1111 * referred by it will not be removed until the vnode is really 1112 * reclaimed. */ 1113 tmpfs_free_dirent(tmp, de); 1114 1115 /* Release the deleted vnode (will destroy the node, notify 1116 * interested parties and clean it from the cache). */ 1117 1118 dnode->tn_status |= TMPFS_NODE_CHANGED; 1119 tmpfs_update(dvp); 1120 1121 error = 0; 1122 1123 out: 1124 return error; 1125 } 1126 1127 static int 1128 tmpfs_symlink(struct vop_symlink_args *v) 1129 { 1130 struct vnode *dvp = v->a_dvp; 1131 struct vnode **vpp = v->a_vpp; 1132 struct componentname *cnp = v->a_cnp; 1133 struct vattr *vap = v->a_vap; 1134 char *target = v->a_target; 1135 1136 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1137 MPASS(vap->va_type == VLNK); 1138 #else 1139 vap->va_type = VLNK; 1140 #endif 1141 1142 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1143 } 1144 1145 static int 1146 tmpfs_readdir(struct vop_readdir_args *v) 1147 { 1148 struct vnode *vp = v->a_vp; 1149 struct uio *uio = v->a_uio; 1150 int *eofflag = v->a_eofflag; 1151 u_long **cookies = v->a_cookies; 1152 int *ncookies = v->a_ncookies; 1153 1154 int error; 1155 ssize_t startresid; 1156 int maxcookies; 1157 struct tmpfs_node *node; 1158 1159 /* This operation only makes sense on directory nodes. */ 1160 if (vp->v_type != VDIR) 1161 return ENOTDIR; 1162 1163 maxcookies = 0; 1164 node = VP_TO_TMPFS_DIR(vp); 1165 1166 startresid = uio->uio_resid; 1167 1168 /* Allocate cookies for NFS and compat modules. */ 1169 if (cookies != NULL && ncookies != NULL) { 1170 maxcookies = howmany(node->tn_size, 1171 sizeof(struct tmpfs_dirent)) + 2; 1172 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1173 M_WAITOK); 1174 *ncookies = 0; 1175 } 1176 1177 if (cookies == NULL) 1178 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1179 else 1180 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1181 ncookies); 1182 1183 /* Buffer was filled without hitting EOF. */ 1184 if (error == EJUSTRETURN) 1185 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1186 1187 if (error != 0 && cookies != NULL) 1188 free(*cookies, M_TEMP); 1189 1190 if (eofflag != NULL) 1191 *eofflag = 1192 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1193 1194 return error; 1195 } 1196 1197 static int 1198 tmpfs_readlink(struct vop_readlink_args *v) 1199 { 1200 struct vnode *vp = v->a_vp; 1201 struct uio *uio = v->a_uio; 1202 1203 int error; 1204 struct tmpfs_node *node; 1205 1206 MPASS(uio->uio_offset == 0); 1207 MPASS(vp->v_type == VLNK); 1208 1209 node = VP_TO_TMPFS_NODE(vp); 1210 1211 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1212 uio); 1213 node->tn_status |= TMPFS_NODE_ACCESSED; 1214 1215 return error; 1216 } 1217 1218 static int 1219 tmpfs_inactive(struct vop_inactive_args *v) 1220 { 1221 struct vnode *vp = v->a_vp; 1222 1223 struct tmpfs_node *node; 1224 1225 node = VP_TO_TMPFS_NODE(vp); 1226 1227 if (node->tn_links == 0) 1228 vrecycle(vp); 1229 1230 return 0; 1231 } 1232 1233 int 1234 tmpfs_reclaim(struct vop_reclaim_args *v) 1235 { 1236 struct vnode *vp = v->a_vp; 1237 1238 struct tmpfs_mount *tmp; 1239 struct tmpfs_node *node; 1240 1241 node = VP_TO_TMPFS_NODE(vp); 1242 tmp = VFS_TO_TMPFS(vp->v_mount); 1243 1244 if (vp->v_type == VREG) 1245 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1246 else 1247 vnode_destroy_vobject(vp); 1248 vp->v_object = NULL; 1249 cache_purge(vp); 1250 1251 TMPFS_NODE_LOCK(node); 1252 TMPFS_ASSERT_ELOCKED(node); 1253 tmpfs_free_vp(vp); 1254 1255 /* If the node referenced by this vnode was deleted by the user, 1256 * we must free its associated data structures (now that the vnode 1257 * is being reclaimed). */ 1258 if (node->tn_links == 0 && 1259 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1260 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1261 TMPFS_NODE_UNLOCK(node); 1262 tmpfs_free_node(tmp, node); 1263 } else 1264 TMPFS_NODE_UNLOCK(node); 1265 1266 MPASS(vp->v_data == NULL); 1267 return 0; 1268 } 1269 1270 static int 1271 tmpfs_print(struct vop_print_args *v) 1272 { 1273 struct vnode *vp = v->a_vp; 1274 1275 struct tmpfs_node *node; 1276 1277 node = VP_TO_TMPFS_NODE(vp); 1278 1279 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1280 node, node->tn_flags, node->tn_links); 1281 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1282 node->tn_mode, node->tn_uid, node->tn_gid, 1283 (intmax_t)node->tn_size, node->tn_status); 1284 1285 if (vp->v_type == VFIFO) 1286 fifo_printinfo(vp); 1287 1288 printf("\n"); 1289 1290 return 0; 1291 } 1292 1293 static int 1294 tmpfs_pathconf(struct vop_pathconf_args *v) 1295 { 1296 int name = v->a_name; 1297 register_t *retval = v->a_retval; 1298 1299 int error; 1300 1301 error = 0; 1302 1303 switch (name) { 1304 case _PC_LINK_MAX: 1305 *retval = LINK_MAX; 1306 break; 1307 1308 case _PC_NAME_MAX: 1309 *retval = NAME_MAX; 1310 break; 1311 1312 case _PC_PATH_MAX: 1313 *retval = PATH_MAX; 1314 break; 1315 1316 case _PC_PIPE_BUF: 1317 *retval = PIPE_BUF; 1318 break; 1319 1320 case _PC_CHOWN_RESTRICTED: 1321 *retval = 1; 1322 break; 1323 1324 case _PC_NO_TRUNC: 1325 *retval = 1; 1326 break; 1327 1328 case _PC_SYNC_IO: 1329 *retval = 1; 1330 break; 1331 1332 case _PC_FILESIZEBITS: 1333 *retval = 0; /* XXX Don't know which value should I return. */ 1334 break; 1335 1336 default: 1337 error = EINVAL; 1338 } 1339 1340 return error; 1341 } 1342 1343 static int 1344 tmpfs_vptofh(struct vop_vptofh_args *ap) 1345 { 1346 struct tmpfs_fid *tfhp; 1347 struct tmpfs_node *node; 1348 1349 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1350 node = VP_TO_TMPFS_NODE(ap->a_vp); 1351 1352 tfhp->tf_len = sizeof(struct tmpfs_fid); 1353 tfhp->tf_id = node->tn_id; 1354 tfhp->tf_gen = node->tn_gen; 1355 1356 return (0); 1357 } 1358 1359 static int 1360 tmpfs_whiteout(struct vop_whiteout_args *ap) 1361 { 1362 struct vnode *dvp = ap->a_dvp; 1363 struct componentname *cnp = ap->a_cnp; 1364 struct tmpfs_dirent *de; 1365 1366 switch (ap->a_flags) { 1367 case LOOKUP: 1368 return (0); 1369 case CREATE: 1370 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1371 if (de != NULL) 1372 return (de->td_node == NULL ? 0 : EEXIST); 1373 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1374 case DELETE: 1375 tmpfs_dir_whiteout_remove(dvp, cnp); 1376 return (0); 1377 default: 1378 panic("tmpfs_whiteout: unknown op"); 1379 } 1380 } 1381 1382 /* 1383 * vnode operations vector used for files stored in a tmpfs file system. 1384 */ 1385 struct vop_vector tmpfs_vnodeop_entries = { 1386 .vop_default = &default_vnodeops, 1387 .vop_lookup = vfs_cache_lookup, 1388 .vop_cachedlookup = tmpfs_lookup, 1389 .vop_create = tmpfs_create, 1390 .vop_mknod = tmpfs_mknod, 1391 .vop_open = tmpfs_open, 1392 .vop_close = tmpfs_close, 1393 .vop_access = tmpfs_access, 1394 .vop_getattr = tmpfs_getattr, 1395 .vop_setattr = tmpfs_setattr, 1396 .vop_read = tmpfs_read, 1397 .vop_write = tmpfs_write, 1398 .vop_fsync = tmpfs_fsync, 1399 .vop_remove = tmpfs_remove, 1400 .vop_link = tmpfs_link, 1401 .vop_rename = tmpfs_rename, 1402 .vop_mkdir = tmpfs_mkdir, 1403 .vop_rmdir = tmpfs_rmdir, 1404 .vop_symlink = tmpfs_symlink, 1405 .vop_readdir = tmpfs_readdir, 1406 .vop_readlink = tmpfs_readlink, 1407 .vop_inactive = tmpfs_inactive, 1408 .vop_reclaim = tmpfs_reclaim, 1409 .vop_print = tmpfs_print, 1410 .vop_pathconf = tmpfs_pathconf, 1411 .vop_vptofh = tmpfs_vptofh, 1412 .vop_whiteout = tmpfs_whiteout, 1413 .vop_bmap = VOP_EOPNOTSUPP, 1414 }; 1415 1416