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/sf_buf.h> 49 #include <sys/stat.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_param.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_pager.h> 60 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 SYSCTL_DECL(_vfs_tmpfs); 65 66 static volatile int tmpfs_rename_restarts; 67 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69 "Times rename had to restart due to lock contention"); 70 71 /* --------------------------------------------------------------------- */ 72 73 static int 74 tmpfs_lookup(struct vop_cachedlookup_args *v) 75 { 76 struct vnode *dvp = v->a_dvp; 77 struct vnode **vpp = v->a_vpp; 78 struct componentname *cnp = v->a_cnp; 79 80 int error; 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode; 83 84 dnode = VP_TO_TMPFS_DIR(dvp); 85 *vpp = NULLVP; 86 87 /* Check accessibility of requested node as a first step. */ 88 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 89 if (error != 0) 90 goto out; 91 92 /* We cannot be requesting the parent directory of the root node. */ 93 MPASS(IMPLIES(dnode->tn_type == VDIR && 94 dnode->tn_dir.tn_parent == dnode, 95 !(cnp->cn_flags & ISDOTDOT))); 96 97 TMPFS_ASSERT_LOCKED(dnode); 98 if (dnode->tn_dir.tn_parent == NULL) { 99 error = ENOENT; 100 goto out; 101 } 102 if (cnp->cn_flags & ISDOTDOT) { 103 int ltype = 0; 104 105 ltype = VOP_ISLOCKED(dvp); 106 vhold(dvp); 107 VOP_UNLOCK(dvp, 0); 108 /* Allocate a new vnode on the matching entry. */ 109 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 110 cnp->cn_lkflags, vpp); 111 112 vn_lock(dvp, ltype | LK_RETRY); 113 vdrop(dvp); 114 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115 VREF(dvp); 116 *vpp = dvp; 117 error = 0; 118 } else { 119 de = tmpfs_dir_lookup(dnode, NULL, cnp); 120 if (de != NULL && de->td_node == NULL) 121 cnp->cn_flags |= ISWHITEOUT; 122 if (de == NULL || de->td_node == NULL) { 123 /* The entry was not found in the directory. 124 * This is OK if we are creating or renaming an 125 * entry and are working on the last component of 126 * the path name. */ 127 if ((cnp->cn_flags & ISLASTCN) && 128 (cnp->cn_nameiop == CREATE || \ 129 cnp->cn_nameiop == RENAME || 130 (cnp->cn_nameiop == DELETE && 131 cnp->cn_flags & DOWHITEOUT && 132 cnp->cn_flags & ISWHITEOUT))) { 133 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134 cnp->cn_thread); 135 if (error != 0) 136 goto out; 137 138 /* Keep the component name in the buffer for 139 * future uses. */ 140 cnp->cn_flags |= SAVENAME; 141 142 error = EJUSTRETURN; 143 } else 144 error = ENOENT; 145 } else { 146 struct tmpfs_node *tnode; 147 148 /* The entry was found, so get its associated 149 * tmpfs_node. */ 150 tnode = de->td_node; 151 152 /* If we are not at the last path component and 153 * found a non-directory or non-link entry (which 154 * may itself be pointing to a directory), raise 155 * an error. */ 156 if ((tnode->tn_type != VDIR && 157 tnode->tn_type != VLNK) && 158 !(cnp->cn_flags & ISLASTCN)) { 159 error = ENOTDIR; 160 goto out; 161 } 162 163 /* If we are deleting or renaming the entry, keep 164 * track of its tmpfs_dirent so that it can be 165 * easily deleted later. */ 166 if ((cnp->cn_flags & ISLASTCN) && 167 (cnp->cn_nameiop == DELETE || 168 cnp->cn_nameiop == RENAME)) { 169 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 170 cnp->cn_thread); 171 if (error != 0) 172 goto out; 173 174 /* Allocate a new vnode on the matching entry. */ 175 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 176 cnp->cn_lkflags, vpp); 177 if (error != 0) 178 goto out; 179 180 if ((dnode->tn_mode & S_ISTXT) && 181 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 182 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 183 error = EPERM; 184 vput(*vpp); 185 *vpp = NULL; 186 goto out; 187 } 188 cnp->cn_flags |= SAVENAME; 189 } else { 190 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 191 cnp->cn_lkflags, vpp); 192 } 193 } 194 } 195 196 /* Store the result of this lookup in the cache. Avoid this if the 197 * request was for creation, as it does not improve timings on 198 * emprical tests. */ 199 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200 cache_enter(dvp, *vpp, cnp); 201 202 out: 203 /* If there were no errors, *vpp cannot be null and it must be 204 * locked. */ 205 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206 207 return error; 208 } 209 210 /* --------------------------------------------------------------------- */ 211 212 static int 213 tmpfs_create(struct vop_create_args *v) 214 { 215 struct vnode *dvp = v->a_dvp; 216 struct vnode **vpp = v->a_vpp; 217 struct componentname *cnp = v->a_cnp; 218 struct vattr *vap = v->a_vap; 219 220 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 221 222 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 223 } 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 /* --------------------------------------------------------------------- */ 242 243 static int 244 tmpfs_open(struct vop_open_args *v) 245 { 246 struct vnode *vp = v->a_vp; 247 int mode = v->a_mode; 248 249 int error; 250 struct tmpfs_node *node; 251 252 MPASS(VOP_ISLOCKED(vp)); 253 254 node = VP_TO_TMPFS_NODE(vp); 255 256 /* The file is still active but all its names have been removed 257 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 258 * it is about to die. */ 259 if (node->tn_links < 1) 260 return (ENOENT); 261 262 /* If the file is marked append-only, deny write requests. */ 263 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 264 error = EPERM; 265 else { 266 error = 0; 267 /* For regular files, the call below is nop. */ 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273 } 274 275 /* --------------------------------------------------------------------- */ 276 277 static int 278 tmpfs_close(struct vop_close_args *v) 279 { 280 struct vnode *vp = v->a_vp; 281 282 /* Update node times. */ 283 tmpfs_update(vp); 284 285 return (0); 286 } 287 288 /* --------------------------------------------------------------------- */ 289 290 int 291 tmpfs_access(struct vop_access_args *v) 292 { 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338 out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342 } 343 344 /* --------------------------------------------------------------------- */ 345 346 int 347 tmpfs_getattr(struct vop_getattr_args *v) 348 { 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379 } 380 381 int 382 tmpfs_setattr(struct vop_setattr_args *v) 383 { 384 struct vnode *vp = v->a_vp; 385 struct vattr *vap = v->a_vap; 386 struct ucred *cred = v->a_cred; 387 struct thread *td = curthread; 388 389 int error; 390 391 MPASS(VOP_ISLOCKED(vp)); 392 393 error = 0; 394 395 /* Abort if any unsettable attribute is given. */ 396 if (vap->va_type != VNON || 397 vap->va_nlink != VNOVAL || 398 vap->va_fsid != VNOVAL || 399 vap->va_fileid != VNOVAL || 400 vap->va_blocksize != VNOVAL || 401 vap->va_gen != VNOVAL || 402 vap->va_rdev != VNOVAL || 403 vap->va_bytes != VNOVAL) 404 error = EINVAL; 405 406 if (error == 0 && (vap->va_flags != VNOVAL)) 407 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 408 409 if (error == 0 && (vap->va_size != VNOVAL)) 410 error = tmpfs_chsize(vp, vap->va_size, cred, td); 411 412 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 413 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 414 415 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 416 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 417 418 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 419 vap->va_atime.tv_nsec != VNOVAL) || 420 (vap->va_mtime.tv_sec != VNOVAL && 421 vap->va_mtime.tv_nsec != VNOVAL) || 422 (vap->va_birthtime.tv_sec != VNOVAL && 423 vap->va_birthtime.tv_nsec != VNOVAL))) 424 error = tmpfs_chtimes(vp, vap, cred, td); 425 426 /* Update the node times. We give preference to the error codes 427 * generated by this function rather than the ones that may arise 428 * from tmpfs_update. */ 429 tmpfs_update(vp); 430 431 MPASS(VOP_ISLOCKED(vp)); 432 433 return error; 434 } 435 436 static int 437 tmpfs_read(struct vop_read_args *v) 438 { 439 struct vnode *vp; 440 struct uio *uio; 441 struct tmpfs_node *node; 442 443 vp = v->a_vp; 444 if (vp->v_type != VREG) 445 return (EISDIR); 446 uio = v->a_uio; 447 if (uio->uio_offset < 0) 448 return (EINVAL); 449 node = VP_TO_TMPFS_NODE(vp); 450 node->tn_status |= TMPFS_NODE_ACCESSED; 451 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 452 } 453 454 static int 455 tmpfs_write(struct vop_write_args *v) 456 { 457 struct vnode *vp; 458 struct uio *uio; 459 struct tmpfs_node *node; 460 off_t oldsize; 461 int error, ioflag; 462 boolean_t extended; 463 464 vp = v->a_vp; 465 uio = v->a_uio; 466 ioflag = v->a_ioflag; 467 error = 0; 468 node = VP_TO_TMPFS_NODE(vp); 469 oldsize = node->tn_size; 470 471 if (uio->uio_offset < 0 || vp->v_type != VREG) 472 return (EINVAL); 473 if (uio->uio_resid == 0) 474 return (0); 475 if (ioflag & IO_APPEND) 476 uio->uio_offset = node->tn_size; 477 if (uio->uio_offset + uio->uio_resid > 478 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 479 return (EFBIG); 480 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 481 return (EFBIG); 482 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 483 if (extended) { 484 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 485 FALSE); 486 if (error != 0) 487 goto out; 488 } 489 490 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 491 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 492 (extended ? TMPFS_NODE_CHANGED : 0); 493 if (node->tn_mode & (S_ISUID | S_ISGID)) { 494 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 495 node->tn_mode &= ~(S_ISUID | S_ISGID); 496 } 497 if (error != 0) 498 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 499 500 out: 501 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 502 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 503 504 return (error); 505 } 506 507 /* --------------------------------------------------------------------- */ 508 509 static int 510 tmpfs_fsync(struct vop_fsync_args *v) 511 { 512 struct vnode *vp = v->a_vp; 513 514 MPASS(VOP_ISLOCKED(vp)); 515 516 tmpfs_update(vp); 517 518 return 0; 519 } 520 521 /* --------------------------------------------------------------------- */ 522 523 static int 524 tmpfs_remove(struct vop_remove_args *v) 525 { 526 struct vnode *dvp = v->a_dvp; 527 struct vnode *vp = v->a_vp; 528 529 int error; 530 struct tmpfs_dirent *de; 531 struct tmpfs_mount *tmp; 532 struct tmpfs_node *dnode; 533 struct tmpfs_node *node; 534 535 MPASS(VOP_ISLOCKED(dvp)); 536 MPASS(VOP_ISLOCKED(vp)); 537 538 if (vp->v_type == VDIR) { 539 error = EISDIR; 540 goto out; 541 } 542 543 dnode = VP_TO_TMPFS_DIR(dvp); 544 node = VP_TO_TMPFS_NODE(vp); 545 tmp = VFS_TO_TMPFS(vp->v_mount); 546 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 547 MPASS(de != NULL); 548 549 /* Files marked as immutable or append-only cannot be deleted. */ 550 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 551 (dnode->tn_flags & APPEND)) { 552 error = EPERM; 553 goto out; 554 } 555 556 /* Remove the entry from the directory; as it is a file, we do not 557 * have to change the number of hard links of the directory. */ 558 tmpfs_dir_detach(dvp, de); 559 if (v->a_cnp->cn_flags & DOWHITEOUT) 560 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 561 562 /* Free the directory entry we just deleted. Note that the node 563 * referred by it will not be removed until the vnode is really 564 * reclaimed. */ 565 tmpfs_free_dirent(tmp, de); 566 567 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 568 error = 0; 569 570 out: 571 572 return error; 573 } 574 575 /* --------------------------------------------------------------------- */ 576 577 static int 578 tmpfs_link(struct vop_link_args *v) 579 { 580 struct vnode *dvp = v->a_tdvp; 581 struct vnode *vp = v->a_vp; 582 struct componentname *cnp = v->a_cnp; 583 584 int error; 585 struct tmpfs_dirent *de; 586 struct tmpfs_node *node; 587 588 MPASS(VOP_ISLOCKED(dvp)); 589 MPASS(cnp->cn_flags & HASBUF); 590 MPASS(dvp != vp); /* XXX When can this be false? */ 591 592 node = VP_TO_TMPFS_NODE(vp); 593 594 /* XXX: Why aren't the following two tests done by the caller? */ 595 596 /* Hard links of directories are forbidden. */ 597 if (vp->v_type == VDIR) { 598 error = EPERM; 599 goto out; 600 } 601 602 /* Cannot create cross-device links. */ 603 if (dvp->v_mount != vp->v_mount) { 604 error = EXDEV; 605 goto out; 606 } 607 608 /* Ensure that we do not overflow the maximum number of links imposed 609 * by the system. */ 610 MPASS(node->tn_links <= LINK_MAX); 611 if (node->tn_links == LINK_MAX) { 612 error = EMLINK; 613 goto out; 614 } 615 616 /* We cannot create links of files marked immutable or append-only. */ 617 if (node->tn_flags & (IMMUTABLE | APPEND)) { 618 error = EPERM; 619 goto out; 620 } 621 622 /* Allocate a new directory entry to represent the node. */ 623 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 624 cnp->cn_nameptr, cnp->cn_namelen, &de); 625 if (error != 0) 626 goto out; 627 628 /* Insert the new directory entry into the appropriate directory. */ 629 if (cnp->cn_flags & ISWHITEOUT) 630 tmpfs_dir_whiteout_remove(dvp, cnp); 631 tmpfs_dir_attach(dvp, de); 632 633 /* vp link count has changed, so update node times. */ 634 node->tn_status |= TMPFS_NODE_CHANGED; 635 tmpfs_update(vp); 636 637 error = 0; 638 639 out: 640 return error; 641 } 642 643 /* --------------------------------------------------------------------- */ 644 645 /* 646 * We acquire all but fdvp locks using non-blocking acquisitions. If we 647 * fail to acquire any lock in the path we will drop all held locks, 648 * acquire the new lock in a blocking fashion, and then release it and 649 * restart the rename. This acquire/release step ensures that we do not 650 * spin on a lock waiting for release. On error release all vnode locks 651 * and decrement references the way tmpfs_rename() would do. 652 */ 653 static int 654 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 655 struct vnode *tdvp, struct vnode **tvpp, 656 struct componentname *fcnp, struct componentname *tcnp) 657 { 658 struct vnode *nvp; 659 struct mount *mp; 660 struct tmpfs_dirent *de; 661 int error, restarts = 0; 662 663 VOP_UNLOCK(tdvp, 0); 664 if (*tvpp != NULL && *tvpp != tdvp) 665 VOP_UNLOCK(*tvpp, 0); 666 mp = fdvp->v_mount; 667 668 relock: 669 restarts += 1; 670 error = vn_lock(fdvp, LK_EXCLUSIVE); 671 if (error) 672 goto releout; 673 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 674 VOP_UNLOCK(fdvp, 0); 675 error = vn_lock(tdvp, LK_EXCLUSIVE); 676 if (error) 677 goto releout; 678 VOP_UNLOCK(tdvp, 0); 679 goto relock; 680 } 681 /* 682 * Re-resolve fvp to be certain it still exists and fetch the 683 * correct vnode. 684 */ 685 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 686 if (de == NULL) { 687 VOP_UNLOCK(fdvp, 0); 688 VOP_UNLOCK(tdvp, 0); 689 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 690 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 691 error = EINVAL; 692 else 693 error = ENOENT; 694 goto releout; 695 } 696 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 697 if (error != 0) { 698 VOP_UNLOCK(fdvp, 0); 699 VOP_UNLOCK(tdvp, 0); 700 if (error != EBUSY) 701 goto releout; 702 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 703 if (error != 0) 704 goto releout; 705 VOP_UNLOCK(nvp, 0); 706 /* 707 * Concurrent rename race. 708 */ 709 if (nvp == tdvp) { 710 vrele(nvp); 711 error = EINVAL; 712 goto releout; 713 } 714 vrele(*fvpp); 715 *fvpp = nvp; 716 goto relock; 717 } 718 vrele(*fvpp); 719 *fvpp = nvp; 720 VOP_UNLOCK(*fvpp, 0); 721 /* 722 * Re-resolve tvp and acquire the vnode lock if present. 723 */ 724 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 725 /* 726 * If tvp disappeared we just carry on. 727 */ 728 if (de == NULL && *tvpp != NULL) { 729 vrele(*tvpp); 730 *tvpp = NULL; 731 } 732 /* 733 * Get the tvp ino if the lookup succeeded. We may have to restart 734 * if the non-blocking acquire fails. 735 */ 736 if (de != NULL) { 737 nvp = NULL; 738 error = tmpfs_alloc_vp(mp, de->td_node, 739 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 740 if (*tvpp != NULL) 741 vrele(*tvpp); 742 *tvpp = nvp; 743 if (error != 0) { 744 VOP_UNLOCK(fdvp, 0); 745 VOP_UNLOCK(tdvp, 0); 746 if (error != EBUSY) 747 goto releout; 748 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 749 &nvp); 750 if (error != 0) 751 goto releout; 752 VOP_UNLOCK(nvp, 0); 753 /* 754 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 755 */ 756 if (nvp == fdvp) { 757 error = ENOTEMPTY; 758 goto releout; 759 } 760 goto relock; 761 } 762 } 763 tmpfs_rename_restarts += restarts; 764 765 return (0); 766 767 releout: 768 vrele(fdvp); 769 vrele(*fvpp); 770 vrele(tdvp); 771 if (*tvpp != NULL) 772 vrele(*tvpp); 773 tmpfs_rename_restarts += restarts; 774 775 return (error); 776 } 777 778 static int 779 tmpfs_rename(struct vop_rename_args *v) 780 { 781 struct vnode *fdvp = v->a_fdvp; 782 struct vnode *fvp = v->a_fvp; 783 struct componentname *fcnp = v->a_fcnp; 784 struct vnode *tdvp = v->a_tdvp; 785 struct vnode *tvp = v->a_tvp; 786 struct componentname *tcnp = v->a_tcnp; 787 struct mount *mp = NULL; 788 789 char *newname; 790 int error; 791 struct tmpfs_dirent *de; 792 struct tmpfs_mount *tmp; 793 struct tmpfs_node *fdnode; 794 struct tmpfs_node *fnode; 795 struct tmpfs_node *tnode; 796 struct tmpfs_node *tdnode; 797 798 MPASS(VOP_ISLOCKED(tdvp)); 799 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 800 MPASS(fcnp->cn_flags & HASBUF); 801 MPASS(tcnp->cn_flags & HASBUF); 802 803 /* Disallow cross-device renames. 804 * XXX Why isn't this done by the caller? */ 805 if (fvp->v_mount != tdvp->v_mount || 806 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 807 error = EXDEV; 808 goto out; 809 } 810 811 /* If source and target are the same file, there is nothing to do. */ 812 if (fvp == tvp) { 813 error = 0; 814 goto out; 815 } 816 817 /* If we need to move the directory between entries, lock the 818 * source so that we can safely operate on it. */ 819 if (fdvp != tdvp && fdvp != tvp) { 820 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 821 mp = tdvp->v_mount; 822 error = vfs_busy(mp, 0); 823 if (error != 0) { 824 mp = NULL; 825 goto out; 826 } 827 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 828 fcnp, tcnp); 829 if (error != 0) { 830 vfs_unbusy(mp); 831 return (error); 832 } 833 ASSERT_VOP_ELOCKED(fdvp, 834 "tmpfs_rename: fdvp not locked"); 835 ASSERT_VOP_ELOCKED(tdvp, 836 "tmpfs_rename: tdvp not locked"); 837 if (tvp != NULL) 838 ASSERT_VOP_ELOCKED(tvp, 839 "tmpfs_rename: tvp not locked"); 840 if (fvp == tvp) { 841 error = 0; 842 goto out_locked; 843 } 844 } 845 } 846 847 tmp = VFS_TO_TMPFS(tdvp->v_mount); 848 tdnode = VP_TO_TMPFS_DIR(tdvp); 849 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 850 fdnode = VP_TO_TMPFS_DIR(fdvp); 851 fnode = VP_TO_TMPFS_NODE(fvp); 852 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 853 854 /* Entry can disappear before we lock fdvp, 855 * also avoid manipulating '.' and '..' entries. */ 856 if (de == NULL) { 857 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 858 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 859 error = EINVAL; 860 else 861 error = ENOENT; 862 goto out_locked; 863 } 864 MPASS(de->td_node == fnode); 865 866 /* If re-naming a directory to another preexisting directory 867 * ensure that the target directory is empty so that its 868 * removal causes no side effects. 869 * Kern_rename gurantees the destination to be a directory 870 * if the source is one. */ 871 if (tvp != NULL) { 872 MPASS(tnode != NULL); 873 874 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 875 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 876 error = EPERM; 877 goto out_locked; 878 } 879 880 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 881 if (tnode->tn_size > 0) { 882 error = ENOTEMPTY; 883 goto out_locked; 884 } 885 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 886 error = ENOTDIR; 887 goto out_locked; 888 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 889 error = EISDIR; 890 goto out_locked; 891 } else { 892 MPASS(fnode->tn_type != VDIR && 893 tnode->tn_type != VDIR); 894 } 895 } 896 897 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 898 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 899 error = EPERM; 900 goto out_locked; 901 } 902 903 /* Ensure that we have enough memory to hold the new name, if it 904 * has to be changed. */ 905 if (fcnp->cn_namelen != tcnp->cn_namelen || 906 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 907 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 908 } else 909 newname = NULL; 910 911 /* If the node is being moved to another directory, we have to do 912 * the move. */ 913 if (fdnode != tdnode) { 914 /* In case we are moving a directory, we have to adjust its 915 * parent to point to the new parent. */ 916 if (de->td_node->tn_type == VDIR) { 917 struct tmpfs_node *n; 918 919 /* Ensure the target directory is not a child of the 920 * directory being moved. Otherwise, we'd end up 921 * with stale nodes. */ 922 n = tdnode; 923 /* TMPFS_LOCK garanties that no nodes are freed while 924 * traversing the list. Nodes can only be marked as 925 * removed: tn_parent == NULL. */ 926 TMPFS_LOCK(tmp); 927 TMPFS_NODE_LOCK(n); 928 while (n != n->tn_dir.tn_parent) { 929 struct tmpfs_node *parent; 930 931 if (n == fnode) { 932 TMPFS_NODE_UNLOCK(n); 933 TMPFS_UNLOCK(tmp); 934 error = EINVAL; 935 if (newname != NULL) 936 free(newname, M_TMPFSNAME); 937 goto out_locked; 938 } 939 parent = n->tn_dir.tn_parent; 940 TMPFS_NODE_UNLOCK(n); 941 if (parent == NULL) { 942 n = NULL; 943 break; 944 } 945 TMPFS_NODE_LOCK(parent); 946 if (parent->tn_dir.tn_parent == NULL) { 947 TMPFS_NODE_UNLOCK(parent); 948 n = NULL; 949 break; 950 } 951 n = parent; 952 } 953 TMPFS_UNLOCK(tmp); 954 if (n == NULL) { 955 error = EINVAL; 956 if (newname != NULL) 957 free(newname, M_TMPFSNAME); 958 goto out_locked; 959 } 960 TMPFS_NODE_UNLOCK(n); 961 962 /* Adjust the parent pointer. */ 963 TMPFS_VALIDATE_DIR(fnode); 964 TMPFS_NODE_LOCK(de->td_node); 965 de->td_node->tn_dir.tn_parent = tdnode; 966 TMPFS_NODE_UNLOCK(de->td_node); 967 968 /* As a result of changing the target of the '..' 969 * entry, the link count of the source and target 970 * directories has to be adjusted. */ 971 TMPFS_NODE_LOCK(tdnode); 972 TMPFS_ASSERT_LOCKED(tdnode); 973 tdnode->tn_links++; 974 TMPFS_NODE_UNLOCK(tdnode); 975 976 TMPFS_NODE_LOCK(fdnode); 977 TMPFS_ASSERT_LOCKED(fdnode); 978 fdnode->tn_links--; 979 TMPFS_NODE_UNLOCK(fdnode); 980 } 981 } 982 983 /* Do the move: just remove the entry from the source directory 984 * and insert it into the target one. */ 985 tmpfs_dir_detach(fdvp, de); 986 987 if (fcnp->cn_flags & DOWHITEOUT) 988 tmpfs_dir_whiteout_add(fdvp, fcnp); 989 if (tcnp->cn_flags & ISWHITEOUT) 990 tmpfs_dir_whiteout_remove(tdvp, tcnp); 991 992 /* If the name has changed, we need to make it effective by changing 993 * it in the directory entry. */ 994 if (newname != NULL) { 995 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 996 997 free(de->ud.td_name, M_TMPFSNAME); 998 de->ud.td_name = newname; 999 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1000 1001 fnode->tn_status |= TMPFS_NODE_CHANGED; 1002 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1003 } 1004 1005 /* If we are overwriting an entry, we have to remove the old one 1006 * from the target directory. */ 1007 if (tvp != NULL) { 1008 struct tmpfs_dirent *tde; 1009 1010 /* Remove the old entry from the target directory. */ 1011 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1012 tmpfs_dir_detach(tdvp, tde); 1013 1014 /* Free the directory entry we just deleted. Note that the 1015 * node referred by it will not be removed until the vnode is 1016 * really reclaimed. */ 1017 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1018 } 1019 1020 tmpfs_dir_attach(tdvp, de); 1021 1022 cache_purge(fvp); 1023 if (tvp != NULL) 1024 cache_purge(tvp); 1025 cache_purge_negative(tdvp); 1026 1027 error = 0; 1028 1029 out_locked: 1030 if (fdvp != tdvp && fdvp != tvp) 1031 VOP_UNLOCK(fdvp, 0); 1032 1033 out: 1034 /* Release target nodes. */ 1035 /* XXX: I don't understand when tdvp can be the same as tvp, but 1036 * other code takes care of this... */ 1037 if (tdvp == tvp) 1038 vrele(tdvp); 1039 else 1040 vput(tdvp); 1041 if (tvp != NULL) 1042 vput(tvp); 1043 1044 /* Release source nodes. */ 1045 vrele(fdvp); 1046 vrele(fvp); 1047 1048 if (mp != NULL) 1049 vfs_unbusy(mp); 1050 1051 return error; 1052 } 1053 1054 /* --------------------------------------------------------------------- */ 1055 1056 static int 1057 tmpfs_mkdir(struct vop_mkdir_args *v) 1058 { 1059 struct vnode *dvp = v->a_dvp; 1060 struct vnode **vpp = v->a_vpp; 1061 struct componentname *cnp = v->a_cnp; 1062 struct vattr *vap = v->a_vap; 1063 1064 MPASS(vap->va_type == VDIR); 1065 1066 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1067 } 1068 1069 /* --------------------------------------------------------------------- */ 1070 1071 static int 1072 tmpfs_rmdir(struct vop_rmdir_args *v) 1073 { 1074 struct vnode *dvp = v->a_dvp; 1075 struct vnode *vp = v->a_vp; 1076 1077 int error; 1078 struct tmpfs_dirent *de; 1079 struct tmpfs_mount *tmp; 1080 struct tmpfs_node *dnode; 1081 struct tmpfs_node *node; 1082 1083 MPASS(VOP_ISLOCKED(dvp)); 1084 MPASS(VOP_ISLOCKED(vp)); 1085 1086 tmp = VFS_TO_TMPFS(dvp->v_mount); 1087 dnode = VP_TO_TMPFS_DIR(dvp); 1088 node = VP_TO_TMPFS_DIR(vp); 1089 1090 /* Directories with more than two entries ('.' and '..') cannot be 1091 * removed. */ 1092 if (node->tn_size > 0) { 1093 error = ENOTEMPTY; 1094 goto out; 1095 } 1096 1097 if ((dnode->tn_flags & APPEND) 1098 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1099 error = EPERM; 1100 goto out; 1101 } 1102 1103 /* This invariant holds only if we are not trying to remove "..". 1104 * We checked for that above so this is safe now. */ 1105 MPASS(node->tn_dir.tn_parent == dnode); 1106 1107 /* Get the directory entry associated with node (vp). This was 1108 * filled by tmpfs_lookup while looking up the entry. */ 1109 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1110 MPASS(TMPFS_DIRENT_MATCHES(de, 1111 v->a_cnp->cn_nameptr, 1112 v->a_cnp->cn_namelen)); 1113 1114 /* Check flags to see if we are allowed to remove the directory. */ 1115 if (dnode->tn_flags & APPEND 1116 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1117 error = EPERM; 1118 goto out; 1119 } 1120 1121 1122 /* Detach the directory entry from the directory (dnode). */ 1123 tmpfs_dir_detach(dvp, de); 1124 if (v->a_cnp->cn_flags & DOWHITEOUT) 1125 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1126 1127 /* No vnode should be allocated for this entry from this point */ 1128 TMPFS_NODE_LOCK(node); 1129 TMPFS_ASSERT_ELOCKED(node); 1130 node->tn_links--; 1131 node->tn_dir.tn_parent = NULL; 1132 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1133 TMPFS_NODE_MODIFIED; 1134 1135 TMPFS_NODE_UNLOCK(node); 1136 1137 TMPFS_NODE_LOCK(dnode); 1138 TMPFS_ASSERT_ELOCKED(dnode); 1139 dnode->tn_links--; 1140 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1141 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1142 TMPFS_NODE_UNLOCK(dnode); 1143 1144 cache_purge(dvp); 1145 cache_purge(vp); 1146 1147 /* Free the directory entry we just deleted. Note that the node 1148 * referred by it will not be removed until the vnode is really 1149 * reclaimed. */ 1150 tmpfs_free_dirent(tmp, de); 1151 1152 /* Release the deleted vnode (will destroy the node, notify 1153 * interested parties and clean it from the cache). */ 1154 1155 dnode->tn_status |= TMPFS_NODE_CHANGED; 1156 tmpfs_update(dvp); 1157 1158 error = 0; 1159 1160 out: 1161 return error; 1162 } 1163 1164 /* --------------------------------------------------------------------- */ 1165 1166 static int 1167 tmpfs_symlink(struct vop_symlink_args *v) 1168 { 1169 struct vnode *dvp = v->a_dvp; 1170 struct vnode **vpp = v->a_vpp; 1171 struct componentname *cnp = v->a_cnp; 1172 struct vattr *vap = v->a_vap; 1173 char *target = v->a_target; 1174 1175 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1176 MPASS(vap->va_type == VLNK); 1177 #else 1178 vap->va_type = VLNK; 1179 #endif 1180 1181 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1182 } 1183 1184 /* --------------------------------------------------------------------- */ 1185 1186 static int 1187 tmpfs_readdir(struct vop_readdir_args *v) 1188 { 1189 struct vnode *vp = v->a_vp; 1190 struct uio *uio = v->a_uio; 1191 int *eofflag = v->a_eofflag; 1192 u_long **cookies = v->a_cookies; 1193 int *ncookies = v->a_ncookies; 1194 1195 int error; 1196 ssize_t startresid; 1197 int maxcookies; 1198 struct tmpfs_node *node; 1199 1200 /* This operation only makes sense on directory nodes. */ 1201 if (vp->v_type != VDIR) 1202 return ENOTDIR; 1203 1204 maxcookies = 0; 1205 node = VP_TO_TMPFS_DIR(vp); 1206 1207 startresid = uio->uio_resid; 1208 1209 /* Allocate cookies for NFS and compat modules. */ 1210 if (cookies != NULL && ncookies != NULL) { 1211 maxcookies = howmany(node->tn_size, 1212 sizeof(struct tmpfs_dirent)) + 2; 1213 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1214 M_WAITOK); 1215 *ncookies = 0; 1216 } 1217 1218 if (cookies == NULL) 1219 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1220 else 1221 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1222 ncookies); 1223 1224 /* Buffer was filled without hitting EOF. */ 1225 if (error == EJUSTRETURN) 1226 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1227 1228 if (error != 0 && cookies != NULL) 1229 free(*cookies, M_TEMP); 1230 1231 if (eofflag != NULL) 1232 *eofflag = 1233 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1234 1235 return error; 1236 } 1237 1238 /* --------------------------------------------------------------------- */ 1239 1240 static int 1241 tmpfs_readlink(struct vop_readlink_args *v) 1242 { 1243 struct vnode *vp = v->a_vp; 1244 struct uio *uio = v->a_uio; 1245 1246 int error; 1247 struct tmpfs_node *node; 1248 1249 MPASS(uio->uio_offset == 0); 1250 MPASS(vp->v_type == VLNK); 1251 1252 node = VP_TO_TMPFS_NODE(vp); 1253 1254 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1255 uio); 1256 node->tn_status |= TMPFS_NODE_ACCESSED; 1257 1258 return error; 1259 } 1260 1261 /* --------------------------------------------------------------------- */ 1262 1263 static int 1264 tmpfs_inactive(struct vop_inactive_args *v) 1265 { 1266 struct vnode *vp = v->a_vp; 1267 1268 struct tmpfs_node *node; 1269 1270 node = VP_TO_TMPFS_NODE(vp); 1271 1272 if (node->tn_links == 0) 1273 vrecycle(vp); 1274 1275 return 0; 1276 } 1277 1278 /* --------------------------------------------------------------------- */ 1279 1280 int 1281 tmpfs_reclaim(struct vop_reclaim_args *v) 1282 { 1283 struct vnode *vp = v->a_vp; 1284 1285 struct tmpfs_mount *tmp; 1286 struct tmpfs_node *node; 1287 1288 node = VP_TO_TMPFS_NODE(vp); 1289 tmp = VFS_TO_TMPFS(vp->v_mount); 1290 1291 if (vp->v_type == VREG) 1292 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1293 else 1294 vnode_destroy_vobject(vp); 1295 vp->v_object = NULL; 1296 cache_purge(vp); 1297 1298 TMPFS_NODE_LOCK(node); 1299 TMPFS_ASSERT_ELOCKED(node); 1300 tmpfs_free_vp(vp); 1301 1302 /* If the node referenced by this vnode was deleted by the user, 1303 * we must free its associated data structures (now that the vnode 1304 * is being reclaimed). */ 1305 if (node->tn_links == 0 && 1306 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1307 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1308 TMPFS_NODE_UNLOCK(node); 1309 tmpfs_free_node(tmp, node); 1310 } else 1311 TMPFS_NODE_UNLOCK(node); 1312 1313 MPASS(vp->v_data == NULL); 1314 return 0; 1315 } 1316 1317 /* --------------------------------------------------------------------- */ 1318 1319 static int 1320 tmpfs_print(struct vop_print_args *v) 1321 { 1322 struct vnode *vp = v->a_vp; 1323 1324 struct tmpfs_node *node; 1325 1326 node = VP_TO_TMPFS_NODE(vp); 1327 1328 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1329 node, node->tn_flags, node->tn_links); 1330 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1331 node->tn_mode, node->tn_uid, node->tn_gid, 1332 (intmax_t)node->tn_size, node->tn_status); 1333 1334 if (vp->v_type == VFIFO) 1335 fifo_printinfo(vp); 1336 1337 printf("\n"); 1338 1339 return 0; 1340 } 1341 1342 /* --------------------------------------------------------------------- */ 1343 1344 static int 1345 tmpfs_pathconf(struct vop_pathconf_args *v) 1346 { 1347 int name = v->a_name; 1348 register_t *retval = v->a_retval; 1349 1350 int error; 1351 1352 error = 0; 1353 1354 switch (name) { 1355 case _PC_LINK_MAX: 1356 *retval = LINK_MAX; 1357 break; 1358 1359 case _PC_NAME_MAX: 1360 *retval = NAME_MAX; 1361 break; 1362 1363 case _PC_PATH_MAX: 1364 *retval = PATH_MAX; 1365 break; 1366 1367 case _PC_PIPE_BUF: 1368 *retval = PIPE_BUF; 1369 break; 1370 1371 case _PC_CHOWN_RESTRICTED: 1372 *retval = 1; 1373 break; 1374 1375 case _PC_NO_TRUNC: 1376 *retval = 1; 1377 break; 1378 1379 case _PC_SYNC_IO: 1380 *retval = 1; 1381 break; 1382 1383 case _PC_FILESIZEBITS: 1384 *retval = 0; /* XXX Don't know which value should I return. */ 1385 break; 1386 1387 default: 1388 error = EINVAL; 1389 } 1390 1391 return error; 1392 } 1393 1394 static int 1395 tmpfs_vptofh(struct vop_vptofh_args *ap) 1396 { 1397 struct tmpfs_fid *tfhp; 1398 struct tmpfs_node *node; 1399 1400 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1401 node = VP_TO_TMPFS_NODE(ap->a_vp); 1402 1403 tfhp->tf_len = sizeof(struct tmpfs_fid); 1404 tfhp->tf_id = node->tn_id; 1405 tfhp->tf_gen = node->tn_gen; 1406 1407 return (0); 1408 } 1409 1410 static int 1411 tmpfs_whiteout(struct vop_whiteout_args *ap) 1412 { 1413 struct vnode *dvp = ap->a_dvp; 1414 struct componentname *cnp = ap->a_cnp; 1415 struct tmpfs_dirent *de; 1416 1417 switch (ap->a_flags) { 1418 case LOOKUP: 1419 return (0); 1420 case CREATE: 1421 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1422 if (de != NULL) 1423 return (de->td_node == NULL ? 0 : EEXIST); 1424 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1425 case DELETE: 1426 tmpfs_dir_whiteout_remove(dvp, cnp); 1427 return (0); 1428 default: 1429 panic("tmpfs_whiteout: unknown op"); 1430 } 1431 } 1432 1433 /* --------------------------------------------------------------------- */ 1434 1435 /* 1436 * vnode operations vector used for files stored in a tmpfs file system. 1437 */ 1438 struct vop_vector tmpfs_vnodeop_entries = { 1439 .vop_default = &default_vnodeops, 1440 .vop_lookup = vfs_cache_lookup, 1441 .vop_cachedlookup = tmpfs_lookup, 1442 .vop_create = tmpfs_create, 1443 .vop_mknod = tmpfs_mknod, 1444 .vop_open = tmpfs_open, 1445 .vop_close = tmpfs_close, 1446 .vop_access = tmpfs_access, 1447 .vop_getattr = tmpfs_getattr, 1448 .vop_setattr = tmpfs_setattr, 1449 .vop_read = tmpfs_read, 1450 .vop_write = tmpfs_write, 1451 .vop_fsync = tmpfs_fsync, 1452 .vop_remove = tmpfs_remove, 1453 .vop_link = tmpfs_link, 1454 .vop_rename = tmpfs_rename, 1455 .vop_mkdir = tmpfs_mkdir, 1456 .vop_rmdir = tmpfs_rmdir, 1457 .vop_symlink = tmpfs_symlink, 1458 .vop_readdir = tmpfs_readdir, 1459 .vop_readlink = tmpfs_readlink, 1460 .vop_inactive = tmpfs_inactive, 1461 .vop_reclaim = tmpfs_reclaim, 1462 .vop_print = tmpfs_print, 1463 .vop_pathconf = tmpfs_pathconf, 1464 .vop_vptofh = tmpfs_vptofh, 1465 .vop_whiteout = tmpfs_whiteout, 1466 .vop_bmap = VOP_EOPNOTSUPP, 1467 }; 1468 1469