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