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_check_mtime(vp); 509 tmpfs_update(vp); 510 511 return 0; 512 } 513 514 static int 515 tmpfs_remove(struct vop_remove_args *v) 516 { 517 struct vnode *dvp = v->a_dvp; 518 struct vnode *vp = v->a_vp; 519 520 int error; 521 struct tmpfs_dirent *de; 522 struct tmpfs_mount *tmp; 523 struct tmpfs_node *dnode; 524 struct tmpfs_node *node; 525 526 MPASS(VOP_ISLOCKED(dvp)); 527 MPASS(VOP_ISLOCKED(vp)); 528 529 if (vp->v_type == VDIR) { 530 error = EISDIR; 531 goto out; 532 } 533 534 dnode = VP_TO_TMPFS_DIR(dvp); 535 node = VP_TO_TMPFS_NODE(vp); 536 tmp = VFS_TO_TMPFS(vp->v_mount); 537 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 538 MPASS(de != NULL); 539 540 /* Files marked as immutable or append-only cannot be deleted. */ 541 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 542 (dnode->tn_flags & APPEND)) { 543 error = EPERM; 544 goto out; 545 } 546 547 /* Remove the entry from the directory; as it is a file, we do not 548 * have to change the number of hard links of the directory. */ 549 tmpfs_dir_detach(dvp, de); 550 if (v->a_cnp->cn_flags & DOWHITEOUT) 551 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 552 553 /* Free the directory entry we just deleted. Note that the node 554 * referred by it will not be removed until the vnode is really 555 * reclaimed. */ 556 tmpfs_free_dirent(tmp, de); 557 558 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 559 error = 0; 560 561 out: 562 563 return error; 564 } 565 566 static int 567 tmpfs_link(struct vop_link_args *v) 568 { 569 struct vnode *dvp = v->a_tdvp; 570 struct vnode *vp = v->a_vp; 571 struct componentname *cnp = v->a_cnp; 572 573 int error; 574 struct tmpfs_dirent *de; 575 struct tmpfs_node *node; 576 577 MPASS(VOP_ISLOCKED(dvp)); 578 MPASS(cnp->cn_flags & HASBUF); 579 MPASS(dvp != vp); /* XXX When can this be false? */ 580 node = VP_TO_TMPFS_NODE(vp); 581 582 /* Ensure that we do not overflow the maximum number of links imposed 583 * by the system. */ 584 MPASS(node->tn_links <= LINK_MAX); 585 if (node->tn_links == LINK_MAX) { 586 error = EMLINK; 587 goto out; 588 } 589 590 /* We cannot create links of files marked immutable or append-only. */ 591 if (node->tn_flags & (IMMUTABLE | APPEND)) { 592 error = EPERM; 593 goto out; 594 } 595 596 /* Allocate a new directory entry to represent the node. */ 597 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 598 cnp->cn_nameptr, cnp->cn_namelen, &de); 599 if (error != 0) 600 goto out; 601 602 /* Insert the new directory entry into the appropriate directory. */ 603 if (cnp->cn_flags & ISWHITEOUT) 604 tmpfs_dir_whiteout_remove(dvp, cnp); 605 tmpfs_dir_attach(dvp, de); 606 607 /* vp link count has changed, so update node times. */ 608 node->tn_status |= TMPFS_NODE_CHANGED; 609 tmpfs_update(vp); 610 611 error = 0; 612 613 out: 614 return error; 615 } 616 617 /* 618 * We acquire all but fdvp locks using non-blocking acquisitions. If we 619 * fail to acquire any lock in the path we will drop all held locks, 620 * acquire the new lock in a blocking fashion, and then release it and 621 * restart the rename. This acquire/release step ensures that we do not 622 * spin on a lock waiting for release. On error release all vnode locks 623 * and decrement references the way tmpfs_rename() would do. 624 */ 625 static int 626 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 627 struct vnode *tdvp, struct vnode **tvpp, 628 struct componentname *fcnp, struct componentname *tcnp) 629 { 630 struct vnode *nvp; 631 struct mount *mp; 632 struct tmpfs_dirent *de; 633 int error, restarts = 0; 634 635 VOP_UNLOCK(tdvp, 0); 636 if (*tvpp != NULL && *tvpp != tdvp) 637 VOP_UNLOCK(*tvpp, 0); 638 mp = fdvp->v_mount; 639 640 relock: 641 restarts += 1; 642 error = vn_lock(fdvp, LK_EXCLUSIVE); 643 if (error) 644 goto releout; 645 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 646 VOP_UNLOCK(fdvp, 0); 647 error = vn_lock(tdvp, LK_EXCLUSIVE); 648 if (error) 649 goto releout; 650 VOP_UNLOCK(tdvp, 0); 651 goto relock; 652 } 653 /* 654 * Re-resolve fvp to be certain it still exists and fetch the 655 * correct vnode. 656 */ 657 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 658 if (de == NULL) { 659 VOP_UNLOCK(fdvp, 0); 660 VOP_UNLOCK(tdvp, 0); 661 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 662 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 663 error = EINVAL; 664 else 665 error = ENOENT; 666 goto releout; 667 } 668 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 669 if (error != 0) { 670 VOP_UNLOCK(fdvp, 0); 671 VOP_UNLOCK(tdvp, 0); 672 if (error != EBUSY) 673 goto releout; 674 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 675 if (error != 0) 676 goto releout; 677 VOP_UNLOCK(nvp, 0); 678 /* 679 * Concurrent rename race. 680 */ 681 if (nvp == tdvp) { 682 vrele(nvp); 683 error = EINVAL; 684 goto releout; 685 } 686 vrele(*fvpp); 687 *fvpp = nvp; 688 goto relock; 689 } 690 vrele(*fvpp); 691 *fvpp = nvp; 692 VOP_UNLOCK(*fvpp, 0); 693 /* 694 * Re-resolve tvp and acquire the vnode lock if present. 695 */ 696 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 697 /* 698 * If tvp disappeared we just carry on. 699 */ 700 if (de == NULL && *tvpp != NULL) { 701 vrele(*tvpp); 702 *tvpp = NULL; 703 } 704 /* 705 * Get the tvp ino if the lookup succeeded. We may have to restart 706 * if the non-blocking acquire fails. 707 */ 708 if (de != NULL) { 709 nvp = NULL; 710 error = tmpfs_alloc_vp(mp, de->td_node, 711 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 712 if (*tvpp != NULL) 713 vrele(*tvpp); 714 *tvpp = nvp; 715 if (error != 0) { 716 VOP_UNLOCK(fdvp, 0); 717 VOP_UNLOCK(tdvp, 0); 718 if (error != EBUSY) 719 goto releout; 720 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 721 &nvp); 722 if (error != 0) 723 goto releout; 724 VOP_UNLOCK(nvp, 0); 725 /* 726 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 727 */ 728 if (nvp == fdvp) { 729 error = ENOTEMPTY; 730 goto releout; 731 } 732 goto relock; 733 } 734 } 735 tmpfs_rename_restarts += restarts; 736 737 return (0); 738 739 releout: 740 vrele(fdvp); 741 vrele(*fvpp); 742 vrele(tdvp); 743 if (*tvpp != NULL) 744 vrele(*tvpp); 745 tmpfs_rename_restarts += restarts; 746 747 return (error); 748 } 749 750 static int 751 tmpfs_rename(struct vop_rename_args *v) 752 { 753 struct vnode *fdvp = v->a_fdvp; 754 struct vnode *fvp = v->a_fvp; 755 struct componentname *fcnp = v->a_fcnp; 756 struct vnode *tdvp = v->a_tdvp; 757 struct vnode *tvp = v->a_tvp; 758 struct componentname *tcnp = v->a_tcnp; 759 struct mount *mp = NULL; 760 761 char *newname; 762 int error; 763 struct tmpfs_dirent *de; 764 struct tmpfs_mount *tmp; 765 struct tmpfs_node *fdnode; 766 struct tmpfs_node *fnode; 767 struct tmpfs_node *tnode; 768 struct tmpfs_node *tdnode; 769 770 MPASS(VOP_ISLOCKED(tdvp)); 771 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 772 MPASS(fcnp->cn_flags & HASBUF); 773 MPASS(tcnp->cn_flags & HASBUF); 774 775 /* Disallow cross-device renames. 776 * XXX Why isn't this done by the caller? */ 777 if (fvp->v_mount != tdvp->v_mount || 778 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 779 error = EXDEV; 780 goto out; 781 } 782 783 /* If source and target are the same file, there is nothing to do. */ 784 if (fvp == tvp) { 785 error = 0; 786 goto out; 787 } 788 789 /* If we need to move the directory between entries, lock the 790 * source so that we can safely operate on it. */ 791 if (fdvp != tdvp && fdvp != tvp) { 792 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 793 mp = tdvp->v_mount; 794 error = vfs_busy(mp, 0); 795 if (error != 0) { 796 mp = NULL; 797 goto out; 798 } 799 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 800 fcnp, tcnp); 801 if (error != 0) { 802 vfs_unbusy(mp); 803 return (error); 804 } 805 ASSERT_VOP_ELOCKED(fdvp, 806 "tmpfs_rename: fdvp not locked"); 807 ASSERT_VOP_ELOCKED(tdvp, 808 "tmpfs_rename: tdvp not locked"); 809 if (tvp != NULL) 810 ASSERT_VOP_ELOCKED(tvp, 811 "tmpfs_rename: tvp not locked"); 812 if (fvp == tvp) { 813 error = 0; 814 goto out_locked; 815 } 816 } 817 } 818 819 tmp = VFS_TO_TMPFS(tdvp->v_mount); 820 tdnode = VP_TO_TMPFS_DIR(tdvp); 821 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 822 fdnode = VP_TO_TMPFS_DIR(fdvp); 823 fnode = VP_TO_TMPFS_NODE(fvp); 824 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 825 826 /* Entry can disappear before we lock fdvp, 827 * also avoid manipulating '.' and '..' entries. */ 828 if (de == NULL) { 829 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 830 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 831 error = EINVAL; 832 else 833 error = ENOENT; 834 goto out_locked; 835 } 836 MPASS(de->td_node == fnode); 837 838 /* If re-naming a directory to another preexisting directory 839 * ensure that the target directory is empty so that its 840 * removal causes no side effects. 841 * Kern_rename gurantees the destination to be a directory 842 * if the source is one. */ 843 if (tvp != NULL) { 844 MPASS(tnode != NULL); 845 846 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 847 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 848 error = EPERM; 849 goto out_locked; 850 } 851 852 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 853 if (tnode->tn_size > 0) { 854 error = ENOTEMPTY; 855 goto out_locked; 856 } 857 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 858 error = ENOTDIR; 859 goto out_locked; 860 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 861 error = EISDIR; 862 goto out_locked; 863 } else { 864 MPASS(fnode->tn_type != VDIR && 865 tnode->tn_type != VDIR); 866 } 867 } 868 869 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 870 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 871 error = EPERM; 872 goto out_locked; 873 } 874 875 /* Ensure that we have enough memory to hold the new name, if it 876 * has to be changed. */ 877 if (fcnp->cn_namelen != tcnp->cn_namelen || 878 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 879 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 880 } else 881 newname = NULL; 882 883 /* If the node is being moved to another directory, we have to do 884 * the move. */ 885 if (fdnode != tdnode) { 886 /* In case we are moving a directory, we have to adjust its 887 * parent to point to the new parent. */ 888 if (de->td_node->tn_type == VDIR) { 889 struct tmpfs_node *n; 890 891 /* Ensure the target directory is not a child of the 892 * directory being moved. Otherwise, we'd end up 893 * with stale nodes. */ 894 n = tdnode; 895 /* TMPFS_LOCK garanties that no nodes are freed while 896 * traversing the list. Nodes can only be marked as 897 * removed: tn_parent == NULL. */ 898 TMPFS_LOCK(tmp); 899 TMPFS_NODE_LOCK(n); 900 while (n != n->tn_dir.tn_parent) { 901 struct tmpfs_node *parent; 902 903 if (n == fnode) { 904 TMPFS_NODE_UNLOCK(n); 905 TMPFS_UNLOCK(tmp); 906 error = EINVAL; 907 if (newname != NULL) 908 free(newname, M_TMPFSNAME); 909 goto out_locked; 910 } 911 parent = n->tn_dir.tn_parent; 912 TMPFS_NODE_UNLOCK(n); 913 if (parent == NULL) { 914 n = NULL; 915 break; 916 } 917 TMPFS_NODE_LOCK(parent); 918 if (parent->tn_dir.tn_parent == NULL) { 919 TMPFS_NODE_UNLOCK(parent); 920 n = NULL; 921 break; 922 } 923 n = parent; 924 } 925 TMPFS_UNLOCK(tmp); 926 if (n == NULL) { 927 error = EINVAL; 928 if (newname != NULL) 929 free(newname, M_TMPFSNAME); 930 goto out_locked; 931 } 932 TMPFS_NODE_UNLOCK(n); 933 934 /* Adjust the parent pointer. */ 935 TMPFS_VALIDATE_DIR(fnode); 936 TMPFS_NODE_LOCK(de->td_node); 937 de->td_node->tn_dir.tn_parent = tdnode; 938 TMPFS_NODE_UNLOCK(de->td_node); 939 940 /* As a result of changing the target of the '..' 941 * entry, the link count of the source and target 942 * directories has to be adjusted. */ 943 TMPFS_NODE_LOCK(tdnode); 944 TMPFS_ASSERT_LOCKED(tdnode); 945 tdnode->tn_links++; 946 TMPFS_NODE_UNLOCK(tdnode); 947 948 TMPFS_NODE_LOCK(fdnode); 949 TMPFS_ASSERT_LOCKED(fdnode); 950 fdnode->tn_links--; 951 TMPFS_NODE_UNLOCK(fdnode); 952 } 953 } 954 955 /* Do the move: just remove the entry from the source directory 956 * and insert it into the target one. */ 957 tmpfs_dir_detach(fdvp, de); 958 959 if (fcnp->cn_flags & DOWHITEOUT) 960 tmpfs_dir_whiteout_add(fdvp, fcnp); 961 if (tcnp->cn_flags & ISWHITEOUT) 962 tmpfs_dir_whiteout_remove(tdvp, tcnp); 963 964 /* If the name has changed, we need to make it effective by changing 965 * it in the directory entry. */ 966 if (newname != NULL) { 967 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 968 969 free(de->ud.td_name, M_TMPFSNAME); 970 de->ud.td_name = newname; 971 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 972 973 fnode->tn_status |= TMPFS_NODE_CHANGED; 974 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 975 } 976 977 /* If we are overwriting an entry, we have to remove the old one 978 * from the target directory. */ 979 if (tvp != NULL) { 980 struct tmpfs_dirent *tde; 981 982 /* Remove the old entry from the target directory. */ 983 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 984 tmpfs_dir_detach(tdvp, tde); 985 986 /* Free the directory entry we just deleted. Note that the 987 * node referred by it will not be removed until the vnode is 988 * really reclaimed. */ 989 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 990 } 991 992 tmpfs_dir_attach(tdvp, de); 993 994 cache_purge(fvp); 995 if (tvp != NULL) 996 cache_purge(tvp); 997 cache_purge_negative(tdvp); 998 999 error = 0; 1000 1001 out_locked: 1002 if (fdvp != tdvp && fdvp != tvp) 1003 VOP_UNLOCK(fdvp, 0); 1004 1005 out: 1006 /* Release target nodes. */ 1007 /* XXX: I don't understand when tdvp can be the same as tvp, but 1008 * other code takes care of this... */ 1009 if (tdvp == tvp) 1010 vrele(tdvp); 1011 else 1012 vput(tdvp); 1013 if (tvp != NULL) 1014 vput(tvp); 1015 1016 /* Release source nodes. */ 1017 vrele(fdvp); 1018 vrele(fvp); 1019 1020 if (mp != NULL) 1021 vfs_unbusy(mp); 1022 1023 return error; 1024 } 1025 1026 static int 1027 tmpfs_mkdir(struct vop_mkdir_args *v) 1028 { 1029 struct vnode *dvp = v->a_dvp; 1030 struct vnode **vpp = v->a_vpp; 1031 struct componentname *cnp = v->a_cnp; 1032 struct vattr *vap = v->a_vap; 1033 1034 MPASS(vap->va_type == VDIR); 1035 1036 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1037 } 1038 1039 static int 1040 tmpfs_rmdir(struct vop_rmdir_args *v) 1041 { 1042 struct vnode *dvp = v->a_dvp; 1043 struct vnode *vp = v->a_vp; 1044 1045 int error; 1046 struct tmpfs_dirent *de; 1047 struct tmpfs_mount *tmp; 1048 struct tmpfs_node *dnode; 1049 struct tmpfs_node *node; 1050 1051 MPASS(VOP_ISLOCKED(dvp)); 1052 MPASS(VOP_ISLOCKED(vp)); 1053 1054 tmp = VFS_TO_TMPFS(dvp->v_mount); 1055 dnode = VP_TO_TMPFS_DIR(dvp); 1056 node = VP_TO_TMPFS_DIR(vp); 1057 1058 /* Directories with more than two entries ('.' and '..') cannot be 1059 * removed. */ 1060 if (node->tn_size > 0) { 1061 error = ENOTEMPTY; 1062 goto out; 1063 } 1064 1065 if ((dnode->tn_flags & APPEND) 1066 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1067 error = EPERM; 1068 goto out; 1069 } 1070 1071 /* This invariant holds only if we are not trying to remove "..". 1072 * We checked for that above so this is safe now. */ 1073 MPASS(node->tn_dir.tn_parent == dnode); 1074 1075 /* Get the directory entry associated with node (vp). This was 1076 * filled by tmpfs_lookup while looking up the entry. */ 1077 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1078 MPASS(TMPFS_DIRENT_MATCHES(de, 1079 v->a_cnp->cn_nameptr, 1080 v->a_cnp->cn_namelen)); 1081 1082 /* Check flags to see if we are allowed to remove the directory. */ 1083 if (dnode->tn_flags & APPEND 1084 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1085 error = EPERM; 1086 goto out; 1087 } 1088 1089 1090 /* Detach the directory entry from the directory (dnode). */ 1091 tmpfs_dir_detach(dvp, de); 1092 if (v->a_cnp->cn_flags & DOWHITEOUT) 1093 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1094 1095 /* No vnode should be allocated for this entry from this point */ 1096 TMPFS_NODE_LOCK(node); 1097 TMPFS_ASSERT_ELOCKED(node); 1098 node->tn_links--; 1099 node->tn_dir.tn_parent = NULL; 1100 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1101 TMPFS_NODE_MODIFIED; 1102 1103 TMPFS_NODE_UNLOCK(node); 1104 1105 TMPFS_NODE_LOCK(dnode); 1106 TMPFS_ASSERT_ELOCKED(dnode); 1107 dnode->tn_links--; 1108 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1109 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1110 TMPFS_NODE_UNLOCK(dnode); 1111 1112 cache_purge(dvp); 1113 cache_purge(vp); 1114 1115 /* Free the directory entry we just deleted. Note that the node 1116 * referred by it will not be removed until the vnode is really 1117 * reclaimed. */ 1118 tmpfs_free_dirent(tmp, de); 1119 1120 /* Release the deleted vnode (will destroy the node, notify 1121 * interested parties and clean it from the cache). */ 1122 1123 dnode->tn_status |= TMPFS_NODE_CHANGED; 1124 tmpfs_update(dvp); 1125 1126 error = 0; 1127 1128 out: 1129 return error; 1130 } 1131 1132 static int 1133 tmpfs_symlink(struct vop_symlink_args *v) 1134 { 1135 struct vnode *dvp = v->a_dvp; 1136 struct vnode **vpp = v->a_vpp; 1137 struct componentname *cnp = v->a_cnp; 1138 struct vattr *vap = v->a_vap; 1139 char *target = v->a_target; 1140 1141 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1142 MPASS(vap->va_type == VLNK); 1143 #else 1144 vap->va_type = VLNK; 1145 #endif 1146 1147 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1148 } 1149 1150 static int 1151 tmpfs_readdir(struct vop_readdir_args *v) 1152 { 1153 struct vnode *vp = v->a_vp; 1154 struct uio *uio = v->a_uio; 1155 int *eofflag = v->a_eofflag; 1156 u_long **cookies = v->a_cookies; 1157 int *ncookies = v->a_ncookies; 1158 1159 int error; 1160 ssize_t startresid; 1161 int maxcookies; 1162 struct tmpfs_node *node; 1163 1164 /* This operation only makes sense on directory nodes. */ 1165 if (vp->v_type != VDIR) 1166 return ENOTDIR; 1167 1168 maxcookies = 0; 1169 node = VP_TO_TMPFS_DIR(vp); 1170 1171 startresid = uio->uio_resid; 1172 1173 /* Allocate cookies for NFS and compat modules. */ 1174 if (cookies != NULL && ncookies != NULL) { 1175 maxcookies = howmany(node->tn_size, 1176 sizeof(struct tmpfs_dirent)) + 2; 1177 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1178 M_WAITOK); 1179 *ncookies = 0; 1180 } 1181 1182 if (cookies == NULL) 1183 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1184 else 1185 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1186 ncookies); 1187 1188 /* Buffer was filled without hitting EOF. */ 1189 if (error == EJUSTRETURN) 1190 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1191 1192 if (error != 0 && cookies != NULL) 1193 free(*cookies, M_TEMP); 1194 1195 if (eofflag != NULL) 1196 *eofflag = 1197 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1198 1199 return error; 1200 } 1201 1202 static int 1203 tmpfs_readlink(struct vop_readlink_args *v) 1204 { 1205 struct vnode *vp = v->a_vp; 1206 struct uio *uio = v->a_uio; 1207 1208 int error; 1209 struct tmpfs_node *node; 1210 1211 MPASS(uio->uio_offset == 0); 1212 MPASS(vp->v_type == VLNK); 1213 1214 node = VP_TO_TMPFS_NODE(vp); 1215 1216 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1217 uio); 1218 node->tn_status |= TMPFS_NODE_ACCESSED; 1219 1220 return error; 1221 } 1222 1223 static int 1224 tmpfs_inactive(struct vop_inactive_args *v) 1225 { 1226 struct vnode *vp; 1227 struct tmpfs_node *node; 1228 1229 vp = v->a_vp; 1230 node = VP_TO_TMPFS_NODE(vp); 1231 if (node->tn_links == 0) 1232 vrecycle(vp); 1233 else 1234 tmpfs_check_mtime(vp); 1235 return (0); 1236 } 1237 1238 int 1239 tmpfs_reclaim(struct vop_reclaim_args *v) 1240 { 1241 struct vnode *vp = v->a_vp; 1242 1243 struct tmpfs_mount *tmp; 1244 struct tmpfs_node *node; 1245 1246 node = VP_TO_TMPFS_NODE(vp); 1247 tmp = VFS_TO_TMPFS(vp->v_mount); 1248 1249 if (vp->v_type == VREG) 1250 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1251 else 1252 vnode_destroy_vobject(vp); 1253 vp->v_object = NULL; 1254 cache_purge(vp); 1255 1256 TMPFS_NODE_LOCK(node); 1257 TMPFS_ASSERT_ELOCKED(node); 1258 tmpfs_free_vp(vp); 1259 1260 /* If the node referenced by this vnode was deleted by the user, 1261 * we must free its associated data structures (now that the vnode 1262 * is being reclaimed). */ 1263 if (node->tn_links == 0 && 1264 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1265 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1266 TMPFS_NODE_UNLOCK(node); 1267 tmpfs_free_node(tmp, node); 1268 } else 1269 TMPFS_NODE_UNLOCK(node); 1270 1271 MPASS(vp->v_data == NULL); 1272 return 0; 1273 } 1274 1275 static int 1276 tmpfs_print(struct vop_print_args *v) 1277 { 1278 struct vnode *vp = v->a_vp; 1279 1280 struct tmpfs_node *node; 1281 1282 node = VP_TO_TMPFS_NODE(vp); 1283 1284 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1285 node, node->tn_flags, node->tn_links); 1286 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1287 node->tn_mode, node->tn_uid, node->tn_gid, 1288 (intmax_t)node->tn_size, node->tn_status); 1289 1290 if (vp->v_type == VFIFO) 1291 fifo_printinfo(vp); 1292 1293 printf("\n"); 1294 1295 return 0; 1296 } 1297 1298 static int 1299 tmpfs_pathconf(struct vop_pathconf_args *v) 1300 { 1301 int name = v->a_name; 1302 register_t *retval = v->a_retval; 1303 1304 int error; 1305 1306 error = 0; 1307 1308 switch (name) { 1309 case _PC_LINK_MAX: 1310 *retval = LINK_MAX; 1311 break; 1312 1313 case _PC_NAME_MAX: 1314 *retval = NAME_MAX; 1315 break; 1316 1317 case _PC_PATH_MAX: 1318 *retval = PATH_MAX; 1319 break; 1320 1321 case _PC_PIPE_BUF: 1322 *retval = PIPE_BUF; 1323 break; 1324 1325 case _PC_CHOWN_RESTRICTED: 1326 *retval = 1; 1327 break; 1328 1329 case _PC_NO_TRUNC: 1330 *retval = 1; 1331 break; 1332 1333 case _PC_SYNC_IO: 1334 *retval = 1; 1335 break; 1336 1337 case _PC_FILESIZEBITS: 1338 *retval = 0; /* XXX Don't know which value should I return. */ 1339 break; 1340 1341 default: 1342 error = EINVAL; 1343 } 1344 1345 return error; 1346 } 1347 1348 static int 1349 tmpfs_vptofh(struct vop_vptofh_args *ap) 1350 { 1351 struct tmpfs_fid *tfhp; 1352 struct tmpfs_node *node; 1353 1354 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1355 node = VP_TO_TMPFS_NODE(ap->a_vp); 1356 1357 tfhp->tf_len = sizeof(struct tmpfs_fid); 1358 tfhp->tf_id = node->tn_id; 1359 tfhp->tf_gen = node->tn_gen; 1360 1361 return (0); 1362 } 1363 1364 static int 1365 tmpfs_whiteout(struct vop_whiteout_args *ap) 1366 { 1367 struct vnode *dvp = ap->a_dvp; 1368 struct componentname *cnp = ap->a_cnp; 1369 struct tmpfs_dirent *de; 1370 1371 switch (ap->a_flags) { 1372 case LOOKUP: 1373 return (0); 1374 case CREATE: 1375 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1376 if (de != NULL) 1377 return (de->td_node == NULL ? 0 : EEXIST); 1378 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1379 case DELETE: 1380 tmpfs_dir_whiteout_remove(dvp, cnp); 1381 return (0); 1382 default: 1383 panic("tmpfs_whiteout: unknown op"); 1384 } 1385 } 1386 1387 /* 1388 * vnode operations vector used for files stored in a tmpfs file system. 1389 */ 1390 struct vop_vector tmpfs_vnodeop_entries = { 1391 .vop_default = &default_vnodeops, 1392 .vop_lookup = vfs_cache_lookup, 1393 .vop_cachedlookup = tmpfs_lookup, 1394 .vop_create = tmpfs_create, 1395 .vop_mknod = tmpfs_mknod, 1396 .vop_open = tmpfs_open, 1397 .vop_close = tmpfs_close, 1398 .vop_access = tmpfs_access, 1399 .vop_getattr = tmpfs_getattr, 1400 .vop_setattr = tmpfs_setattr, 1401 .vop_read = tmpfs_read, 1402 .vop_write = tmpfs_write, 1403 .vop_fsync = tmpfs_fsync, 1404 .vop_remove = tmpfs_remove, 1405 .vop_link = tmpfs_link, 1406 .vop_rename = tmpfs_rename, 1407 .vop_mkdir = tmpfs_mkdir, 1408 .vop_rmdir = tmpfs_rmdir, 1409 .vop_symlink = tmpfs_symlink, 1410 .vop_readdir = tmpfs_readdir, 1411 .vop_readlink = tmpfs_readlink, 1412 .vop_inactive = tmpfs_inactive, 1413 .vop_reclaim = tmpfs_reclaim, 1414 .vop_print = tmpfs_print, 1415 .vop_pathconf = tmpfs_pathconf, 1416 .vop_vptofh = tmpfs_vptofh, 1417 .vop_whiteout = tmpfs_whiteout, 1418 .vop_bmap = VOP_EOPNOTSUPP, 1419 }; 1420 1421