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) != 0) 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 int error; 217 218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 219 220 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 221 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 222 cache_enter(dvp, *vpp, cnp); 223 return (error); 224 } 225 226 static int 227 tmpfs_mknod(struct vop_mknod_args *v) 228 { 229 struct vnode *dvp = v->a_dvp; 230 struct vnode **vpp = v->a_vpp; 231 struct componentname *cnp = v->a_cnp; 232 struct vattr *vap = v->a_vap; 233 234 if (vap->va_type != VBLK && vap->va_type != VCHR && 235 vap->va_type != VFIFO) 236 return EINVAL; 237 238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 239 } 240 241 static int 242 tmpfs_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 /* For regular files, the call below is nop. */ 266 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 267 OBJ_DEAD) == 0, ("dead object")); 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273 } 274 275 static int 276 tmpfs_close(struct vop_close_args *v) 277 { 278 struct vnode *vp = v->a_vp; 279 280 /* Update node times. */ 281 tmpfs_update(vp); 282 283 return (0); 284 } 285 286 int 287 tmpfs_access(struct vop_access_args *v) 288 { 289 struct vnode *vp = v->a_vp; 290 accmode_t accmode = v->a_accmode; 291 struct ucred *cred = v->a_cred; 292 293 int error; 294 struct tmpfs_node *node; 295 296 MPASS(VOP_ISLOCKED(vp)); 297 298 node = VP_TO_TMPFS_NODE(vp); 299 300 switch (vp->v_type) { 301 case VDIR: 302 /* FALLTHROUGH */ 303 case VLNK: 304 /* FALLTHROUGH */ 305 case VREG: 306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 307 error = EROFS; 308 goto out; 309 } 310 break; 311 312 case VBLK: 313 /* FALLTHROUGH */ 314 case VCHR: 315 /* FALLTHROUGH */ 316 case VSOCK: 317 /* FALLTHROUGH */ 318 case VFIFO: 319 break; 320 321 default: 322 error = EINVAL; 323 goto out; 324 } 325 326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 327 error = EPERM; 328 goto out; 329 } 330 331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 332 node->tn_gid, accmode, cred, NULL); 333 334 out: 335 MPASS(VOP_ISLOCKED(vp)); 336 337 return error; 338 } 339 340 int 341 tmpfs_getattr(struct vop_getattr_args *v) 342 { 343 struct vnode *vp = v->a_vp; 344 struct vattr *vap = v->a_vap; 345 346 struct tmpfs_node *node; 347 348 node = VP_TO_TMPFS_NODE(vp); 349 350 tmpfs_update(vp); 351 352 vap->va_type = vp->v_type; 353 vap->va_mode = node->tn_mode; 354 vap->va_nlink = node->tn_links; 355 vap->va_uid = node->tn_uid; 356 vap->va_gid = node->tn_gid; 357 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 358 vap->va_fileid = node->tn_id; 359 vap->va_size = node->tn_size; 360 vap->va_blocksize = PAGE_SIZE; 361 vap->va_atime = node->tn_atime; 362 vap->va_mtime = node->tn_mtime; 363 vap->va_ctime = node->tn_ctime; 364 vap->va_birthtime = node->tn_birthtime; 365 vap->va_gen = node->tn_gen; 366 vap->va_flags = node->tn_flags; 367 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 368 node->tn_rdev : NODEV; 369 vap->va_bytes = round_page(node->tn_size); 370 vap->va_filerev = 0; 371 372 return 0; 373 } 374 375 int 376 tmpfs_setattr(struct vop_setattr_args *v) 377 { 378 struct vnode *vp = v->a_vp; 379 struct vattr *vap = v->a_vap; 380 struct ucred *cred = v->a_cred; 381 struct thread *td = curthread; 382 383 int error; 384 385 MPASS(VOP_ISLOCKED(vp)); 386 387 error = 0; 388 389 /* Abort if any unsettable attribute is given. */ 390 if (vap->va_type != VNON || 391 vap->va_nlink != VNOVAL || 392 vap->va_fsid != VNOVAL || 393 vap->va_fileid != VNOVAL || 394 vap->va_blocksize != VNOVAL || 395 vap->va_gen != VNOVAL || 396 vap->va_rdev != VNOVAL || 397 vap->va_bytes != VNOVAL) 398 error = EINVAL; 399 400 if (error == 0 && (vap->va_flags != VNOVAL)) 401 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 402 403 if (error == 0 && (vap->va_size != VNOVAL)) 404 error = tmpfs_chsize(vp, vap->va_size, cred, td); 405 406 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 407 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 408 409 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 410 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 411 412 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 413 vap->va_atime.tv_nsec != VNOVAL) || 414 (vap->va_mtime.tv_sec != VNOVAL && 415 vap->va_mtime.tv_nsec != VNOVAL) || 416 (vap->va_birthtime.tv_sec != VNOVAL && 417 vap->va_birthtime.tv_nsec != VNOVAL))) 418 error = tmpfs_chtimes(vp, vap, cred, td); 419 420 /* Update the node times. We give preference to the error codes 421 * generated by this function rather than the ones that may arise 422 * from tmpfs_update. */ 423 tmpfs_update(vp); 424 425 MPASS(VOP_ISLOCKED(vp)); 426 427 return error; 428 } 429 430 static int 431 tmpfs_read(struct vop_read_args *v) 432 { 433 struct vnode *vp; 434 struct uio *uio; 435 struct tmpfs_node *node; 436 437 vp = v->a_vp; 438 if (vp->v_type != VREG) 439 return (EISDIR); 440 uio = v->a_uio; 441 if (uio->uio_offset < 0) 442 return (EINVAL); 443 node = VP_TO_TMPFS_NODE(vp); 444 node->tn_status |= TMPFS_NODE_ACCESSED; 445 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 446 } 447 448 static int 449 tmpfs_write(struct vop_write_args *v) 450 { 451 struct vnode *vp; 452 struct uio *uio; 453 struct tmpfs_node *node; 454 off_t oldsize; 455 int error, ioflag; 456 boolean_t extended; 457 458 vp = v->a_vp; 459 uio = v->a_uio; 460 ioflag = v->a_ioflag; 461 error = 0; 462 node = VP_TO_TMPFS_NODE(vp); 463 oldsize = node->tn_size; 464 465 if (uio->uio_offset < 0 || vp->v_type != VREG) 466 return (EINVAL); 467 if (uio->uio_resid == 0) 468 return (0); 469 if (ioflag & IO_APPEND) 470 uio->uio_offset = node->tn_size; 471 if (uio->uio_offset + uio->uio_resid > 472 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 473 return (EFBIG); 474 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 475 return (EFBIG); 476 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 477 if (extended) { 478 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 479 FALSE); 480 if (error != 0) 481 goto out; 482 } 483 484 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 485 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 486 (extended ? TMPFS_NODE_CHANGED : 0); 487 if (node->tn_mode & (S_ISUID | S_ISGID)) { 488 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 489 node->tn_mode &= ~(S_ISUID | S_ISGID); 490 } 491 if (error != 0) 492 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 493 494 out: 495 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 496 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 497 498 return (error); 499 } 500 501 static int 502 tmpfs_fsync(struct vop_fsync_args *v) 503 { 504 struct vnode *vp = v->a_vp; 505 506 MPASS(VOP_ISLOCKED(vp)); 507 508 tmpfs_update(vp); 509 510 return 0; 511 } 512 513 static int 514 tmpfs_remove(struct vop_remove_args *v) 515 { 516 struct vnode *dvp = v->a_dvp; 517 struct vnode *vp = v->a_vp; 518 519 int error; 520 struct tmpfs_dirent *de; 521 struct tmpfs_mount *tmp; 522 struct tmpfs_node *dnode; 523 struct tmpfs_node *node; 524 525 MPASS(VOP_ISLOCKED(dvp)); 526 MPASS(VOP_ISLOCKED(vp)); 527 528 if (vp->v_type == VDIR) { 529 error = EISDIR; 530 goto out; 531 } 532 533 dnode = VP_TO_TMPFS_DIR(dvp); 534 node = VP_TO_TMPFS_NODE(vp); 535 tmp = VFS_TO_TMPFS(vp->v_mount); 536 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 537 MPASS(de != NULL); 538 539 /* Files marked as immutable or append-only cannot be deleted. */ 540 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 541 (dnode->tn_flags & APPEND)) { 542 error = EPERM; 543 goto out; 544 } 545 546 /* Remove the entry from the directory; as it is a file, we do not 547 * have to change the number of hard links of the directory. */ 548 tmpfs_dir_detach(dvp, de); 549 if (v->a_cnp->cn_flags & DOWHITEOUT) 550 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 551 552 /* Free the directory entry we just deleted. Note that the node 553 * referred by it will not be removed until the vnode is really 554 * reclaimed. */ 555 tmpfs_free_dirent(tmp, de); 556 557 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 558 error = 0; 559 560 out: 561 562 return error; 563 } 564 565 static int 566 tmpfs_link(struct vop_link_args *v) 567 { 568 struct vnode *dvp = v->a_tdvp; 569 struct vnode *vp = v->a_vp; 570 struct componentname *cnp = v->a_cnp; 571 572 int error; 573 struct tmpfs_dirent *de; 574 struct tmpfs_node *node; 575 576 MPASS(VOP_ISLOCKED(dvp)); 577 MPASS(cnp->cn_flags & HASBUF); 578 MPASS(dvp != vp); /* XXX When can this be false? */ 579 node = VP_TO_TMPFS_NODE(vp); 580 581 /* Ensure that we do not overflow the maximum number of links imposed 582 * by the system. */ 583 MPASS(node->tn_links <= LINK_MAX); 584 if (node->tn_links == LINK_MAX) { 585 error = EMLINK; 586 goto out; 587 } 588 589 /* We cannot create links of files marked immutable or append-only. */ 590 if (node->tn_flags & (IMMUTABLE | APPEND)) { 591 error = EPERM; 592 goto out; 593 } 594 595 /* Allocate a new directory entry to represent the node. */ 596 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 597 cnp->cn_nameptr, cnp->cn_namelen, &de); 598 if (error != 0) 599 goto out; 600 601 /* Insert the new directory entry into the appropriate directory. */ 602 if (cnp->cn_flags & ISWHITEOUT) 603 tmpfs_dir_whiteout_remove(dvp, cnp); 604 tmpfs_dir_attach(dvp, de); 605 606 /* vp link count has changed, so update node times. */ 607 node->tn_status |= TMPFS_NODE_CHANGED; 608 tmpfs_update(vp); 609 610 error = 0; 611 612 out: 613 return error; 614 } 615 616 /* 617 * We acquire all but fdvp locks using non-blocking acquisitions. If we 618 * fail to acquire any lock in the path we will drop all held locks, 619 * acquire the new lock in a blocking fashion, and then release it and 620 * restart the rename. This acquire/release step ensures that we do not 621 * spin on a lock waiting for release. On error release all vnode locks 622 * and decrement references the way tmpfs_rename() would do. 623 */ 624 static int 625 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 626 struct vnode *tdvp, struct vnode **tvpp, 627 struct componentname *fcnp, struct componentname *tcnp) 628 { 629 struct vnode *nvp; 630 struct mount *mp; 631 struct tmpfs_dirent *de; 632 int error, restarts = 0; 633 634 VOP_UNLOCK(tdvp, 0); 635 if (*tvpp != NULL && *tvpp != tdvp) 636 VOP_UNLOCK(*tvpp, 0); 637 mp = fdvp->v_mount; 638 639 relock: 640 restarts += 1; 641 error = vn_lock(fdvp, LK_EXCLUSIVE); 642 if (error) 643 goto releout; 644 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 645 VOP_UNLOCK(fdvp, 0); 646 error = vn_lock(tdvp, LK_EXCLUSIVE); 647 if (error) 648 goto releout; 649 VOP_UNLOCK(tdvp, 0); 650 goto relock; 651 } 652 /* 653 * Re-resolve fvp to be certain it still exists and fetch the 654 * correct vnode. 655 */ 656 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 657 if (de == NULL) { 658 VOP_UNLOCK(fdvp, 0); 659 VOP_UNLOCK(tdvp, 0); 660 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 661 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 662 error = EINVAL; 663 else 664 error = ENOENT; 665 goto releout; 666 } 667 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 668 if (error != 0) { 669 VOP_UNLOCK(fdvp, 0); 670 VOP_UNLOCK(tdvp, 0); 671 if (error != EBUSY) 672 goto releout; 673 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 674 if (error != 0) 675 goto releout; 676 VOP_UNLOCK(nvp, 0); 677 /* 678 * Concurrent rename race. 679 */ 680 if (nvp == tdvp) { 681 vrele(nvp); 682 error = EINVAL; 683 goto releout; 684 } 685 vrele(*fvpp); 686 *fvpp = nvp; 687 goto relock; 688 } 689 vrele(*fvpp); 690 *fvpp = nvp; 691 VOP_UNLOCK(*fvpp, 0); 692 /* 693 * Re-resolve tvp and acquire the vnode lock if present. 694 */ 695 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 696 /* 697 * If tvp disappeared we just carry on. 698 */ 699 if (de == NULL && *tvpp != NULL) { 700 vrele(*tvpp); 701 *tvpp = NULL; 702 } 703 /* 704 * Get the tvp ino if the lookup succeeded. We may have to restart 705 * if the non-blocking acquire fails. 706 */ 707 if (de != NULL) { 708 nvp = NULL; 709 error = tmpfs_alloc_vp(mp, de->td_node, 710 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 711 if (*tvpp != NULL) 712 vrele(*tvpp); 713 *tvpp = nvp; 714 if (error != 0) { 715 VOP_UNLOCK(fdvp, 0); 716 VOP_UNLOCK(tdvp, 0); 717 if (error != EBUSY) 718 goto releout; 719 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 720 &nvp); 721 if (error != 0) 722 goto releout; 723 VOP_UNLOCK(nvp, 0); 724 /* 725 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 726 */ 727 if (nvp == fdvp) { 728 error = ENOTEMPTY; 729 goto releout; 730 } 731 goto relock; 732 } 733 } 734 tmpfs_rename_restarts += restarts; 735 736 return (0); 737 738 releout: 739 vrele(fdvp); 740 vrele(*fvpp); 741 vrele(tdvp); 742 if (*tvpp != NULL) 743 vrele(*tvpp); 744 tmpfs_rename_restarts += restarts; 745 746 return (error); 747 } 748 749 static int 750 tmpfs_rename(struct vop_rename_args *v) 751 { 752 struct vnode *fdvp = v->a_fdvp; 753 struct vnode *fvp = v->a_fvp; 754 struct componentname *fcnp = v->a_fcnp; 755 struct vnode *tdvp = v->a_tdvp; 756 struct vnode *tvp = v->a_tvp; 757 struct componentname *tcnp = v->a_tcnp; 758 struct mount *mp = NULL; 759 760 char *newname; 761 int error; 762 struct tmpfs_dirent *de; 763 struct tmpfs_mount *tmp; 764 struct tmpfs_node *fdnode; 765 struct tmpfs_node *fnode; 766 struct tmpfs_node *tnode; 767 struct tmpfs_node *tdnode; 768 769 MPASS(VOP_ISLOCKED(tdvp)); 770 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 771 MPASS(fcnp->cn_flags & HASBUF); 772 MPASS(tcnp->cn_flags & HASBUF); 773 774 /* Disallow cross-device renames. 775 * XXX Why isn't this done by the caller? */ 776 if (fvp->v_mount != tdvp->v_mount || 777 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 778 error = EXDEV; 779 goto out; 780 } 781 782 /* If source and target are the same file, there is nothing to do. */ 783 if (fvp == tvp) { 784 error = 0; 785 goto out; 786 } 787 788 /* If we need to move the directory between entries, lock the 789 * source so that we can safely operate on it. */ 790 if (fdvp != tdvp && fdvp != tvp) { 791 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 792 mp = tdvp->v_mount; 793 error = vfs_busy(mp, 0); 794 if (error != 0) { 795 mp = NULL; 796 goto out; 797 } 798 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 799 fcnp, tcnp); 800 if (error != 0) { 801 vfs_unbusy(mp); 802 return (error); 803 } 804 ASSERT_VOP_ELOCKED(fdvp, 805 "tmpfs_rename: fdvp not locked"); 806 ASSERT_VOP_ELOCKED(tdvp, 807 "tmpfs_rename: tdvp not locked"); 808 if (tvp != NULL) 809 ASSERT_VOP_ELOCKED(tvp, 810 "tmpfs_rename: tvp not locked"); 811 if (fvp == tvp) { 812 error = 0; 813 goto out_locked; 814 } 815 } 816 } 817 818 tmp = VFS_TO_TMPFS(tdvp->v_mount); 819 tdnode = VP_TO_TMPFS_DIR(tdvp); 820 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 821 fdnode = VP_TO_TMPFS_DIR(fdvp); 822 fnode = VP_TO_TMPFS_NODE(fvp); 823 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 824 825 /* Entry can disappear before we lock fdvp, 826 * also avoid manipulating '.' and '..' entries. */ 827 if (de == NULL) { 828 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 829 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 830 error = EINVAL; 831 else 832 error = ENOENT; 833 goto out_locked; 834 } 835 MPASS(de->td_node == fnode); 836 837 /* If re-naming a directory to another preexisting directory 838 * ensure that the target directory is empty so that its 839 * removal causes no side effects. 840 * Kern_rename gurantees the destination to be a directory 841 * if the source is one. */ 842 if (tvp != NULL) { 843 MPASS(tnode != NULL); 844 845 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 846 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 847 error = EPERM; 848 goto out_locked; 849 } 850 851 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 852 if (tnode->tn_size > 0) { 853 error = ENOTEMPTY; 854 goto out_locked; 855 } 856 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 857 error = ENOTDIR; 858 goto out_locked; 859 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 860 error = EISDIR; 861 goto out_locked; 862 } else { 863 MPASS(fnode->tn_type != VDIR && 864 tnode->tn_type != VDIR); 865 } 866 } 867 868 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 869 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 870 error = EPERM; 871 goto out_locked; 872 } 873 874 /* Ensure that we have enough memory to hold the new name, if it 875 * has to be changed. */ 876 if (fcnp->cn_namelen != tcnp->cn_namelen || 877 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 878 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 879 } else 880 newname = NULL; 881 882 /* If the node is being moved to another directory, we have to do 883 * the move. */ 884 if (fdnode != tdnode) { 885 /* In case we are moving a directory, we have to adjust its 886 * parent to point to the new parent. */ 887 if (de->td_node->tn_type == VDIR) { 888 struct tmpfs_node *n; 889 890 /* Ensure the target directory is not a child of the 891 * directory being moved. Otherwise, we'd end up 892 * with stale nodes. */ 893 n = tdnode; 894 /* TMPFS_LOCK garanties that no nodes are freed while 895 * traversing the list. Nodes can only be marked as 896 * removed: tn_parent == NULL. */ 897 TMPFS_LOCK(tmp); 898 TMPFS_NODE_LOCK(n); 899 while (n != n->tn_dir.tn_parent) { 900 struct tmpfs_node *parent; 901 902 if (n == fnode) { 903 TMPFS_NODE_UNLOCK(n); 904 TMPFS_UNLOCK(tmp); 905 error = EINVAL; 906 if (newname != NULL) 907 free(newname, M_TMPFSNAME); 908 goto out_locked; 909 } 910 parent = n->tn_dir.tn_parent; 911 TMPFS_NODE_UNLOCK(n); 912 if (parent == NULL) { 913 n = NULL; 914 break; 915 } 916 TMPFS_NODE_LOCK(parent); 917 if (parent->tn_dir.tn_parent == NULL) { 918 TMPFS_NODE_UNLOCK(parent); 919 n = NULL; 920 break; 921 } 922 n = parent; 923 } 924 TMPFS_UNLOCK(tmp); 925 if (n == NULL) { 926 error = EINVAL; 927 if (newname != NULL) 928 free(newname, M_TMPFSNAME); 929 goto out_locked; 930 } 931 TMPFS_NODE_UNLOCK(n); 932 933 /* Adjust the parent pointer. */ 934 TMPFS_VALIDATE_DIR(fnode); 935 TMPFS_NODE_LOCK(de->td_node); 936 de->td_node->tn_dir.tn_parent = tdnode; 937 TMPFS_NODE_UNLOCK(de->td_node); 938 939 /* As a result of changing the target of the '..' 940 * entry, the link count of the source and target 941 * directories has to be adjusted. */ 942 TMPFS_NODE_LOCK(tdnode); 943 TMPFS_ASSERT_LOCKED(tdnode); 944 tdnode->tn_links++; 945 TMPFS_NODE_UNLOCK(tdnode); 946 947 TMPFS_NODE_LOCK(fdnode); 948 TMPFS_ASSERT_LOCKED(fdnode); 949 fdnode->tn_links--; 950 TMPFS_NODE_UNLOCK(fdnode); 951 } 952 } 953 954 /* Do the move: just remove the entry from the source directory 955 * and insert it into the target one. */ 956 tmpfs_dir_detach(fdvp, de); 957 958 if (fcnp->cn_flags & DOWHITEOUT) 959 tmpfs_dir_whiteout_add(fdvp, fcnp); 960 if (tcnp->cn_flags & ISWHITEOUT) 961 tmpfs_dir_whiteout_remove(tdvp, tcnp); 962 963 /* If the name has changed, we need to make it effective by changing 964 * it in the directory entry. */ 965 if (newname != NULL) { 966 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 967 968 free(de->ud.td_name, M_TMPFSNAME); 969 de->ud.td_name = newname; 970 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 971 972 fnode->tn_status |= TMPFS_NODE_CHANGED; 973 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 974 } 975 976 /* If we are overwriting an entry, we have to remove the old one 977 * from the target directory. */ 978 if (tvp != NULL) { 979 struct tmpfs_dirent *tde; 980 981 /* Remove the old entry from the target directory. */ 982 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 983 tmpfs_dir_detach(tdvp, tde); 984 985 /* Free the directory entry we just deleted. Note that the 986 * node referred by it will not be removed until the vnode is 987 * really reclaimed. */ 988 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 989 } 990 991 tmpfs_dir_attach(tdvp, de); 992 993 cache_purge(fvp); 994 if (tvp != NULL) 995 cache_purge(tvp); 996 cache_purge_negative(tdvp); 997 998 error = 0; 999 1000 out_locked: 1001 if (fdvp != tdvp && fdvp != tvp) 1002 VOP_UNLOCK(fdvp, 0); 1003 1004 out: 1005 /* Release target nodes. */ 1006 /* XXX: I don't understand when tdvp can be the same as tvp, but 1007 * other code takes care of this... */ 1008 if (tdvp == tvp) 1009 vrele(tdvp); 1010 else 1011 vput(tdvp); 1012 if (tvp != NULL) 1013 vput(tvp); 1014 1015 /* Release source nodes. */ 1016 vrele(fdvp); 1017 vrele(fvp); 1018 1019 if (mp != NULL) 1020 vfs_unbusy(mp); 1021 1022 return error; 1023 } 1024 1025 static int 1026 tmpfs_mkdir(struct vop_mkdir_args *v) 1027 { 1028 struct vnode *dvp = v->a_dvp; 1029 struct vnode **vpp = v->a_vpp; 1030 struct componentname *cnp = v->a_cnp; 1031 struct vattr *vap = v->a_vap; 1032 1033 MPASS(vap->va_type == VDIR); 1034 1035 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1036 } 1037 1038 static int 1039 tmpfs_rmdir(struct vop_rmdir_args *v) 1040 { 1041 struct vnode *dvp = v->a_dvp; 1042 struct vnode *vp = v->a_vp; 1043 1044 int error; 1045 struct tmpfs_dirent *de; 1046 struct tmpfs_mount *tmp; 1047 struct tmpfs_node *dnode; 1048 struct tmpfs_node *node; 1049 1050 MPASS(VOP_ISLOCKED(dvp)); 1051 MPASS(VOP_ISLOCKED(vp)); 1052 1053 tmp = VFS_TO_TMPFS(dvp->v_mount); 1054 dnode = VP_TO_TMPFS_DIR(dvp); 1055 node = VP_TO_TMPFS_DIR(vp); 1056 1057 /* Directories with more than two entries ('.' and '..') cannot be 1058 * removed. */ 1059 if (node->tn_size > 0) { 1060 error = ENOTEMPTY; 1061 goto out; 1062 } 1063 1064 if ((dnode->tn_flags & APPEND) 1065 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1066 error = EPERM; 1067 goto out; 1068 } 1069 1070 /* This invariant holds only if we are not trying to remove "..". 1071 * We checked for that above so this is safe now. */ 1072 MPASS(node->tn_dir.tn_parent == dnode); 1073 1074 /* Get the directory entry associated with node (vp). This was 1075 * filled by tmpfs_lookup while looking up the entry. */ 1076 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1077 MPASS(TMPFS_DIRENT_MATCHES(de, 1078 v->a_cnp->cn_nameptr, 1079 v->a_cnp->cn_namelen)); 1080 1081 /* Check flags to see if we are allowed to remove the directory. */ 1082 if (dnode->tn_flags & APPEND 1083 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1084 error = EPERM; 1085 goto out; 1086 } 1087 1088 1089 /* Detach the directory entry from the directory (dnode). */ 1090 tmpfs_dir_detach(dvp, de); 1091 if (v->a_cnp->cn_flags & DOWHITEOUT) 1092 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1093 1094 /* No vnode should be allocated for this entry from this point */ 1095 TMPFS_NODE_LOCK(node); 1096 TMPFS_ASSERT_ELOCKED(node); 1097 node->tn_links--; 1098 node->tn_dir.tn_parent = NULL; 1099 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1100 TMPFS_NODE_MODIFIED; 1101 1102 TMPFS_NODE_UNLOCK(node); 1103 1104 TMPFS_NODE_LOCK(dnode); 1105 TMPFS_ASSERT_ELOCKED(dnode); 1106 dnode->tn_links--; 1107 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1108 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1109 TMPFS_NODE_UNLOCK(dnode); 1110 1111 cache_purge(dvp); 1112 cache_purge(vp); 1113 1114 /* Free the directory entry we just deleted. Note that the node 1115 * referred by it will not be removed until the vnode is really 1116 * reclaimed. */ 1117 tmpfs_free_dirent(tmp, de); 1118 1119 /* Release the deleted vnode (will destroy the node, notify 1120 * interested parties and clean it from the cache). */ 1121 1122 dnode->tn_status |= TMPFS_NODE_CHANGED; 1123 tmpfs_update(dvp); 1124 1125 error = 0; 1126 1127 out: 1128 return error; 1129 } 1130 1131 static int 1132 tmpfs_symlink(struct vop_symlink_args *v) 1133 { 1134 struct vnode *dvp = v->a_dvp; 1135 struct vnode **vpp = v->a_vpp; 1136 struct componentname *cnp = v->a_cnp; 1137 struct vattr *vap = v->a_vap; 1138 char *target = v->a_target; 1139 1140 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1141 MPASS(vap->va_type == VLNK); 1142 #else 1143 vap->va_type = VLNK; 1144 #endif 1145 1146 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1147 } 1148 1149 static int 1150 tmpfs_readdir(struct vop_readdir_args *v) 1151 { 1152 struct vnode *vp = v->a_vp; 1153 struct uio *uio = v->a_uio; 1154 int *eofflag = v->a_eofflag; 1155 u_long **cookies = v->a_cookies; 1156 int *ncookies = v->a_ncookies; 1157 1158 int error; 1159 ssize_t startresid; 1160 int maxcookies; 1161 struct tmpfs_node *node; 1162 1163 /* This operation only makes sense on directory nodes. */ 1164 if (vp->v_type != VDIR) 1165 return ENOTDIR; 1166 1167 maxcookies = 0; 1168 node = VP_TO_TMPFS_DIR(vp); 1169 1170 startresid = uio->uio_resid; 1171 1172 /* Allocate cookies for NFS and compat modules. */ 1173 if (cookies != NULL && ncookies != NULL) { 1174 maxcookies = howmany(node->tn_size, 1175 sizeof(struct tmpfs_dirent)) + 2; 1176 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1177 M_WAITOK); 1178 *ncookies = 0; 1179 } 1180 1181 if (cookies == NULL) 1182 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1183 else 1184 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1185 ncookies); 1186 1187 /* Buffer was filled without hitting EOF. */ 1188 if (error == EJUSTRETURN) 1189 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1190 1191 if (error != 0 && cookies != NULL) 1192 free(*cookies, M_TEMP); 1193 1194 if (eofflag != NULL) 1195 *eofflag = 1196 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1197 1198 return error; 1199 } 1200 1201 static int 1202 tmpfs_readlink(struct vop_readlink_args *v) 1203 { 1204 struct vnode *vp = v->a_vp; 1205 struct uio *uio = v->a_uio; 1206 1207 int error; 1208 struct tmpfs_node *node; 1209 1210 MPASS(uio->uio_offset == 0); 1211 MPASS(vp->v_type == VLNK); 1212 1213 node = VP_TO_TMPFS_NODE(vp); 1214 1215 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1216 uio); 1217 node->tn_status |= TMPFS_NODE_ACCESSED; 1218 1219 return error; 1220 } 1221 1222 static int 1223 tmpfs_inactive(struct vop_inactive_args *v) 1224 { 1225 struct vnode *vp = v->a_vp; 1226 1227 struct tmpfs_node *node; 1228 1229 node = VP_TO_TMPFS_NODE(vp); 1230 1231 if (node->tn_links == 0) 1232 vrecycle(vp); 1233 1234 return 0; 1235 } 1236 1237 int 1238 tmpfs_reclaim(struct vop_reclaim_args *v) 1239 { 1240 struct vnode *vp = v->a_vp; 1241 1242 struct tmpfs_mount *tmp; 1243 struct tmpfs_node *node; 1244 1245 node = VP_TO_TMPFS_NODE(vp); 1246 tmp = VFS_TO_TMPFS(vp->v_mount); 1247 1248 if (vp->v_type == VREG) 1249 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1250 else 1251 vnode_destroy_vobject(vp); 1252 vp->v_object = NULL; 1253 cache_purge(vp); 1254 1255 TMPFS_NODE_LOCK(node); 1256 TMPFS_ASSERT_ELOCKED(node); 1257 tmpfs_free_vp(vp); 1258 1259 /* If the node referenced by this vnode was deleted by the user, 1260 * we must free its associated data structures (now that the vnode 1261 * is being reclaimed). */ 1262 if (node->tn_links == 0 && 1263 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1264 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1265 TMPFS_NODE_UNLOCK(node); 1266 tmpfs_free_node(tmp, node); 1267 } else 1268 TMPFS_NODE_UNLOCK(node); 1269 1270 MPASS(vp->v_data == NULL); 1271 return 0; 1272 } 1273 1274 static int 1275 tmpfs_print(struct vop_print_args *v) 1276 { 1277 struct vnode *vp = v->a_vp; 1278 1279 struct tmpfs_node *node; 1280 1281 node = VP_TO_TMPFS_NODE(vp); 1282 1283 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1284 node, node->tn_flags, node->tn_links); 1285 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1286 node->tn_mode, node->tn_uid, node->tn_gid, 1287 (intmax_t)node->tn_size, node->tn_status); 1288 1289 if (vp->v_type == VFIFO) 1290 fifo_printinfo(vp); 1291 1292 printf("\n"); 1293 1294 return 0; 1295 } 1296 1297 static int 1298 tmpfs_pathconf(struct vop_pathconf_args *v) 1299 { 1300 int name = v->a_name; 1301 register_t *retval = v->a_retval; 1302 1303 int error; 1304 1305 error = 0; 1306 1307 switch (name) { 1308 case _PC_LINK_MAX: 1309 *retval = LINK_MAX; 1310 break; 1311 1312 case _PC_NAME_MAX: 1313 *retval = NAME_MAX; 1314 break; 1315 1316 case _PC_PATH_MAX: 1317 *retval = PATH_MAX; 1318 break; 1319 1320 case _PC_PIPE_BUF: 1321 *retval = PIPE_BUF; 1322 break; 1323 1324 case _PC_CHOWN_RESTRICTED: 1325 *retval = 1; 1326 break; 1327 1328 case _PC_NO_TRUNC: 1329 *retval = 1; 1330 break; 1331 1332 case _PC_SYNC_IO: 1333 *retval = 1; 1334 break; 1335 1336 case _PC_FILESIZEBITS: 1337 *retval = 0; /* XXX Don't know which value should I return. */ 1338 break; 1339 1340 default: 1341 error = EINVAL; 1342 } 1343 1344 return error; 1345 } 1346 1347 static int 1348 tmpfs_vptofh(struct vop_vptofh_args *ap) 1349 { 1350 struct tmpfs_fid *tfhp; 1351 struct tmpfs_node *node; 1352 1353 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1354 node = VP_TO_TMPFS_NODE(ap->a_vp); 1355 1356 tfhp->tf_len = sizeof(struct tmpfs_fid); 1357 tfhp->tf_id = node->tn_id; 1358 tfhp->tf_gen = node->tn_gen; 1359 1360 return (0); 1361 } 1362 1363 static int 1364 tmpfs_whiteout(struct vop_whiteout_args *ap) 1365 { 1366 struct vnode *dvp = ap->a_dvp; 1367 struct componentname *cnp = ap->a_cnp; 1368 struct tmpfs_dirent *de; 1369 1370 switch (ap->a_flags) { 1371 case LOOKUP: 1372 return (0); 1373 case CREATE: 1374 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1375 if (de != NULL) 1376 return (de->td_node == NULL ? 0 : EEXIST); 1377 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1378 case DELETE: 1379 tmpfs_dir_whiteout_remove(dvp, cnp); 1380 return (0); 1381 default: 1382 panic("tmpfs_whiteout: unknown op"); 1383 } 1384 } 1385 1386 /* 1387 * vnode operations vector used for files stored in a tmpfs file system. 1388 */ 1389 struct vop_vector tmpfs_vnodeop_entries = { 1390 .vop_default = &default_vnodeops, 1391 .vop_lookup = vfs_cache_lookup, 1392 .vop_cachedlookup = tmpfs_lookup, 1393 .vop_create = tmpfs_create, 1394 .vop_mknod = tmpfs_mknod, 1395 .vop_open = tmpfs_open, 1396 .vop_close = tmpfs_close, 1397 .vop_access = tmpfs_access, 1398 .vop_getattr = tmpfs_getattr, 1399 .vop_setattr = tmpfs_setattr, 1400 .vop_read = tmpfs_read, 1401 .vop_write = tmpfs_write, 1402 .vop_fsync = tmpfs_fsync, 1403 .vop_remove = tmpfs_remove, 1404 .vop_link = tmpfs_link, 1405 .vop_rename = tmpfs_rename, 1406 .vop_mkdir = tmpfs_mkdir, 1407 .vop_rmdir = tmpfs_rmdir, 1408 .vop_symlink = tmpfs_symlink, 1409 .vop_readdir = tmpfs_readdir, 1410 .vop_readlink = tmpfs_readlink, 1411 .vop_inactive = tmpfs_inactive, 1412 .vop_reclaim = tmpfs_reclaim, 1413 .vop_print = tmpfs_print, 1414 .vop_pathconf = tmpfs_pathconf, 1415 .vop_vptofh = tmpfs_vptofh, 1416 .vop_whiteout = tmpfs_whiteout, 1417 .vop_bmap = VOP_EOPNOTSUPP, 1418 }; 1419 1420