1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 11 * 2005 program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * tmpfs vnode interface. 37 */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/dirent.h> 43 #include <sys/fcntl.h> 44 #include <sys/lockf.h> 45 #include <sys/lock.h> 46 #include <sys/mount.h> 47 #include <sys/namei.h> 48 #include <sys/priv.h> 49 #include <sys/proc.h> 50 #include <sys/rwlock.h> 51 #include <sys/sched.h> 52 #include <sys/stat.h> 53 #include <sys/systm.h> 54 #include <sys/sysctl.h> 55 #include <sys/unistd.h> 56 #include <sys/vnode.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_param.h> 60 #include <vm/vm_object.h> 61 #include <vm/vm_page.h> 62 #include <vm/vm_pager.h> 63 64 #include <fs/tmpfs/tmpfs_vnops.h> 65 #include <fs/tmpfs/tmpfs.h> 66 67 SYSCTL_DECL(_vfs_tmpfs); 68 69 static volatile int tmpfs_rename_restarts; 70 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 71 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 72 "Times rename had to restart due to lock contention"); 73 74 static int 75 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 76 struct vnode **rvp) 77 { 78 79 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 80 } 81 82 static int 83 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 84 { 85 struct tmpfs_dirent *de; 86 struct tmpfs_node *dnode, *pnode; 87 struct tmpfs_mount *tm; 88 int error; 89 90 dnode = VP_TO_TMPFS_DIR(dvp); 91 *vpp = NULLVP; 92 93 /* Check accessibility of requested node as a first step. */ 94 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 95 if (error != 0) 96 goto out; 97 98 /* We cannot be requesting the parent directory of the root node. */ 99 MPASS(IMPLIES(dnode->tn_type == VDIR && 100 dnode->tn_dir.tn_parent == dnode, 101 !(cnp->cn_flags & ISDOTDOT))); 102 103 TMPFS_ASSERT_LOCKED(dnode); 104 if (dnode->tn_dir.tn_parent == NULL) { 105 error = ENOENT; 106 goto out; 107 } 108 if (cnp->cn_flags & ISDOTDOT) { 109 tm = VFS_TO_TMPFS(dvp->v_mount); 110 pnode = dnode->tn_dir.tn_parent; 111 tmpfs_ref_node(pnode); 112 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 113 pnode, cnp->cn_lkflags, vpp); 114 tmpfs_free_node(tm, pnode); 115 if (error != 0) 116 goto out; 117 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 118 VREF(dvp); 119 *vpp = dvp; 120 error = 0; 121 } else { 122 de = tmpfs_dir_lookup(dnode, NULL, cnp); 123 if (de != NULL && de->td_node == NULL) 124 cnp->cn_flags |= ISWHITEOUT; 125 if (de == NULL || de->td_node == NULL) { 126 /* 127 * The entry was not found in the directory. 128 * This is OK if we are creating or renaming an 129 * entry and are working on the last component of 130 * the path name. 131 */ 132 if ((cnp->cn_flags & ISLASTCN) && 133 (cnp->cn_nameiop == CREATE || \ 134 cnp->cn_nameiop == RENAME || 135 (cnp->cn_nameiop == DELETE && 136 cnp->cn_flags & DOWHITEOUT && 137 cnp->cn_flags & ISWHITEOUT))) { 138 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 139 cnp->cn_thread); 140 if (error != 0) 141 goto out; 142 143 /* 144 * Keep the component name in the buffer for 145 * future uses. 146 */ 147 cnp->cn_flags |= SAVENAME; 148 149 error = EJUSTRETURN; 150 } else 151 error = ENOENT; 152 } else { 153 struct tmpfs_node *tnode; 154 155 /* 156 * The entry was found, so get its associated 157 * tmpfs_node. 158 */ 159 tnode = de->td_node; 160 161 /* 162 * If we are not at the last path component and 163 * found a non-directory or non-link entry (which 164 * may itself be pointing to a directory), raise 165 * an error. 166 */ 167 if ((tnode->tn_type != VDIR && 168 tnode->tn_type != VLNK) && 169 !(cnp->cn_flags & ISLASTCN)) { 170 error = ENOTDIR; 171 goto out; 172 } 173 174 /* 175 * If we are deleting or renaming the entry, keep 176 * track of its tmpfs_dirent so that it can be 177 * easily deleted later. 178 */ 179 if ((cnp->cn_flags & ISLASTCN) && 180 (cnp->cn_nameiop == DELETE || 181 cnp->cn_nameiop == RENAME)) { 182 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 183 cnp->cn_thread); 184 if (error != 0) 185 goto out; 186 187 /* Allocate a new vnode on the matching entry. */ 188 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 189 cnp->cn_lkflags, vpp); 190 if (error != 0) 191 goto out; 192 193 if ((dnode->tn_mode & S_ISTXT) && 194 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 195 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 196 cnp->cn_cred, cnp->cn_thread)) { 197 error = EPERM; 198 vput(*vpp); 199 *vpp = NULL; 200 goto out; 201 } 202 cnp->cn_flags |= SAVENAME; 203 } else { 204 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 205 cnp->cn_lkflags, vpp); 206 if (error != 0) 207 goto out; 208 } 209 } 210 } 211 212 /* 213 * Store the result of this lookup in the cache. Avoid this if the 214 * request was for creation, as it does not improve timings on 215 * emprical tests. 216 */ 217 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 218 cache_enter(dvp, *vpp, cnp); 219 220 out: 221 /* 222 * If there were no errors, *vpp cannot be null and it must be 223 * locked. 224 */ 225 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 226 227 return (error); 228 } 229 230 static int 231 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 232 { 233 234 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 235 } 236 237 static int 238 tmpfs_lookup(struct vop_lookup_args *v) 239 { 240 241 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 242 } 243 244 static int 245 tmpfs_create(struct vop_create_args *v) 246 { 247 struct vnode *dvp = v->a_dvp; 248 struct vnode **vpp = v->a_vpp; 249 struct componentname *cnp = v->a_cnp; 250 struct vattr *vap = v->a_vap; 251 int error; 252 253 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 254 255 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 256 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 257 cache_enter(dvp, *vpp, cnp); 258 return (error); 259 } 260 261 static int 262 tmpfs_mknod(struct vop_mknod_args *v) 263 { 264 struct vnode *dvp = v->a_dvp; 265 struct vnode **vpp = v->a_vpp; 266 struct componentname *cnp = v->a_cnp; 267 struct vattr *vap = v->a_vap; 268 269 if (vap->va_type != VBLK && vap->va_type != VCHR && 270 vap->va_type != VFIFO) 271 return EINVAL; 272 273 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 274 } 275 276 static int 277 tmpfs_open(struct vop_open_args *v) 278 { 279 struct vnode *vp = v->a_vp; 280 int mode = v->a_mode; 281 282 int error; 283 struct tmpfs_node *node; 284 285 MPASS(VOP_ISLOCKED(vp)); 286 287 node = VP_TO_TMPFS_NODE(vp); 288 289 /* The file is still active but all its names have been removed 290 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 291 * it is about to die. */ 292 if (node->tn_links < 1) 293 return (ENOENT); 294 295 /* If the file is marked append-only, deny write requests. */ 296 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 297 error = EPERM; 298 else { 299 error = 0; 300 /* For regular files, the call below is nop. */ 301 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 302 OBJ_DEAD) == 0, ("dead object")); 303 vnode_create_vobject(vp, node->tn_size, v->a_td); 304 } 305 306 MPASS(VOP_ISLOCKED(vp)); 307 return error; 308 } 309 310 static int 311 tmpfs_close(struct vop_close_args *v) 312 { 313 struct vnode *vp = v->a_vp; 314 315 /* Update node times. */ 316 tmpfs_update(vp); 317 318 return (0); 319 } 320 321 int 322 tmpfs_access(struct vop_access_args *v) 323 { 324 struct vnode *vp = v->a_vp; 325 accmode_t accmode = v->a_accmode; 326 struct ucred *cred = v->a_cred; 327 328 int error; 329 struct tmpfs_node *node; 330 331 MPASS(VOP_ISLOCKED(vp)); 332 333 node = VP_TO_TMPFS_NODE(vp); 334 335 switch (vp->v_type) { 336 case VDIR: 337 /* FALLTHROUGH */ 338 case VLNK: 339 /* FALLTHROUGH */ 340 case VREG: 341 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 342 error = EROFS; 343 goto out; 344 } 345 break; 346 347 case VBLK: 348 /* FALLTHROUGH */ 349 case VCHR: 350 /* FALLTHROUGH */ 351 case VSOCK: 352 /* FALLTHROUGH */ 353 case VFIFO: 354 break; 355 356 default: 357 error = EINVAL; 358 goto out; 359 } 360 361 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 362 error = EPERM; 363 goto out; 364 } 365 366 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 367 node->tn_gid, accmode, cred, NULL); 368 369 out: 370 MPASS(VOP_ISLOCKED(vp)); 371 372 return error; 373 } 374 375 int 376 tmpfs_getattr(struct vop_getattr_args *v) 377 { 378 struct vnode *vp = v->a_vp; 379 struct vattr *vap = v->a_vap; 380 vm_object_t obj; 381 struct tmpfs_node *node; 382 383 node = VP_TO_TMPFS_NODE(vp); 384 385 tmpfs_update(vp); 386 387 vap->va_type = vp->v_type; 388 vap->va_mode = node->tn_mode; 389 vap->va_nlink = node->tn_links; 390 vap->va_uid = node->tn_uid; 391 vap->va_gid = node->tn_gid; 392 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 393 vap->va_fileid = node->tn_id; 394 vap->va_size = node->tn_size; 395 vap->va_blocksize = PAGE_SIZE; 396 vap->va_atime = node->tn_atime; 397 vap->va_mtime = node->tn_mtime; 398 vap->va_ctime = node->tn_ctime; 399 vap->va_birthtime = node->tn_birthtime; 400 vap->va_gen = node->tn_gen; 401 vap->va_flags = node->tn_flags; 402 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 403 node->tn_rdev : NODEV; 404 if (vp->v_type == VREG) { 405 obj = node->tn_reg.tn_aobj; 406 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 407 } else 408 vap->va_bytes = node->tn_size; 409 vap->va_filerev = 0; 410 411 return 0; 412 } 413 414 int 415 tmpfs_setattr(struct vop_setattr_args *v) 416 { 417 struct vnode *vp = v->a_vp; 418 struct vattr *vap = v->a_vap; 419 struct ucred *cred = v->a_cred; 420 struct thread *td = curthread; 421 422 int error; 423 424 MPASS(VOP_ISLOCKED(vp)); 425 426 error = 0; 427 428 /* Abort if any unsettable attribute is given. */ 429 if (vap->va_type != VNON || 430 vap->va_nlink != VNOVAL || 431 vap->va_fsid != VNOVAL || 432 vap->va_fileid != VNOVAL || 433 vap->va_blocksize != VNOVAL || 434 vap->va_gen != VNOVAL || 435 vap->va_rdev != VNOVAL || 436 vap->va_bytes != VNOVAL) 437 error = EINVAL; 438 439 if (error == 0 && (vap->va_flags != VNOVAL)) 440 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 441 442 if (error == 0 && (vap->va_size != VNOVAL)) 443 error = tmpfs_chsize(vp, vap->va_size, cred, td); 444 445 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 446 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 447 448 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 449 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 450 451 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 452 vap->va_atime.tv_nsec != VNOVAL) || 453 (vap->va_mtime.tv_sec != VNOVAL && 454 vap->va_mtime.tv_nsec != VNOVAL) || 455 (vap->va_birthtime.tv_sec != VNOVAL && 456 vap->va_birthtime.tv_nsec != VNOVAL))) 457 error = tmpfs_chtimes(vp, vap, cred, td); 458 459 /* Update the node times. We give preference to the error codes 460 * generated by this function rather than the ones that may arise 461 * from tmpfs_update. */ 462 tmpfs_update(vp); 463 464 MPASS(VOP_ISLOCKED(vp)); 465 466 return error; 467 } 468 469 static int 470 tmpfs_read(struct vop_read_args *v) 471 { 472 struct vnode *vp; 473 struct uio *uio; 474 struct tmpfs_node *node; 475 476 vp = v->a_vp; 477 if (vp->v_type != VREG) 478 return (EISDIR); 479 uio = v->a_uio; 480 if (uio->uio_offset < 0) 481 return (EINVAL); 482 node = VP_TO_TMPFS_NODE(vp); 483 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 484 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 485 } 486 487 static int 488 tmpfs_write(struct vop_write_args *v) 489 { 490 struct vnode *vp; 491 struct uio *uio; 492 struct tmpfs_node *node; 493 off_t oldsize; 494 int error, ioflag; 495 496 vp = v->a_vp; 497 uio = v->a_uio; 498 ioflag = v->a_ioflag; 499 error = 0; 500 node = VP_TO_TMPFS_NODE(vp); 501 oldsize = node->tn_size; 502 503 if (uio->uio_offset < 0 || vp->v_type != VREG) 504 return (EINVAL); 505 if (uio->uio_resid == 0) 506 return (0); 507 if (ioflag & IO_APPEND) 508 uio->uio_offset = node->tn_size; 509 if (uio->uio_offset + uio->uio_resid > 510 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 511 return (EFBIG); 512 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 513 return (EFBIG); 514 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 515 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 516 FALSE); 517 if (error != 0) 518 goto out; 519 } 520 521 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 522 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 523 TMPFS_NODE_CHANGED; 524 if (node->tn_mode & (S_ISUID | S_ISGID)) { 525 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 526 node->tn_mode &= ~(S_ISUID | S_ISGID); 527 } 528 if (error != 0) 529 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 530 531 out: 532 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 533 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 534 535 return (error); 536 } 537 538 static int 539 tmpfs_fsync(struct vop_fsync_args *v) 540 { 541 struct vnode *vp = v->a_vp; 542 543 MPASS(VOP_ISLOCKED(vp)); 544 545 tmpfs_check_mtime(vp); 546 tmpfs_update(vp); 547 548 return 0; 549 } 550 551 static int 552 tmpfs_remove(struct vop_remove_args *v) 553 { 554 struct vnode *dvp = v->a_dvp; 555 struct vnode *vp = v->a_vp; 556 557 int error; 558 struct tmpfs_dirent *de; 559 struct tmpfs_mount *tmp; 560 struct tmpfs_node *dnode; 561 struct tmpfs_node *node; 562 563 MPASS(VOP_ISLOCKED(dvp)); 564 MPASS(VOP_ISLOCKED(vp)); 565 566 if (vp->v_type == VDIR) { 567 error = EISDIR; 568 goto out; 569 } 570 571 dnode = VP_TO_TMPFS_DIR(dvp); 572 node = VP_TO_TMPFS_NODE(vp); 573 tmp = VFS_TO_TMPFS(vp->v_mount); 574 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 575 MPASS(de != NULL); 576 577 /* Files marked as immutable or append-only cannot be deleted. */ 578 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 579 (dnode->tn_flags & APPEND)) { 580 error = EPERM; 581 goto out; 582 } 583 584 /* Remove the entry from the directory; as it is a file, we do not 585 * have to change the number of hard links of the directory. */ 586 tmpfs_dir_detach(dvp, de); 587 if (v->a_cnp->cn_flags & DOWHITEOUT) 588 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 589 590 /* Free the directory entry we just deleted. Note that the node 591 * referred by it will not be removed until the vnode is really 592 * reclaimed. */ 593 tmpfs_free_dirent(tmp, de); 594 595 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 596 error = 0; 597 598 out: 599 600 return error; 601 } 602 603 static int 604 tmpfs_link(struct vop_link_args *v) 605 { 606 struct vnode *dvp = v->a_tdvp; 607 struct vnode *vp = v->a_vp; 608 struct componentname *cnp = v->a_cnp; 609 610 int error; 611 struct tmpfs_dirent *de; 612 struct tmpfs_node *node; 613 614 MPASS(VOP_ISLOCKED(dvp)); 615 MPASS(cnp->cn_flags & HASBUF); 616 MPASS(dvp != vp); /* XXX When can this be false? */ 617 node = VP_TO_TMPFS_NODE(vp); 618 619 /* Ensure that we do not overflow the maximum number of links imposed 620 * by the system. */ 621 MPASS(node->tn_links <= LINK_MAX); 622 if (node->tn_links == LINK_MAX) { 623 error = EMLINK; 624 goto out; 625 } 626 627 /* We cannot create links of files marked immutable or append-only. */ 628 if (node->tn_flags & (IMMUTABLE | APPEND)) { 629 error = EPERM; 630 goto out; 631 } 632 633 /* Allocate a new directory entry to represent the node. */ 634 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 635 cnp->cn_nameptr, cnp->cn_namelen, &de); 636 if (error != 0) 637 goto out; 638 639 /* Insert the new directory entry into the appropriate directory. */ 640 if (cnp->cn_flags & ISWHITEOUT) 641 tmpfs_dir_whiteout_remove(dvp, cnp); 642 tmpfs_dir_attach(dvp, de); 643 644 /* vp link count has changed, so update node times. */ 645 node->tn_status |= TMPFS_NODE_CHANGED; 646 tmpfs_update(vp); 647 648 error = 0; 649 650 out: 651 return error; 652 } 653 654 /* 655 * We acquire all but fdvp locks using non-blocking acquisitions. If we 656 * fail to acquire any lock in the path we will drop all held locks, 657 * acquire the new lock in a blocking fashion, and then release it and 658 * restart the rename. This acquire/release step ensures that we do not 659 * spin on a lock waiting for release. On error release all vnode locks 660 * and decrement references the way tmpfs_rename() would do. 661 */ 662 static int 663 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 664 struct vnode *tdvp, struct vnode **tvpp, 665 struct componentname *fcnp, struct componentname *tcnp) 666 { 667 struct vnode *nvp; 668 struct mount *mp; 669 struct tmpfs_dirent *de; 670 int error, restarts = 0; 671 672 VOP_UNLOCK(tdvp, 0); 673 if (*tvpp != NULL && *tvpp != tdvp) 674 VOP_UNLOCK(*tvpp, 0); 675 mp = fdvp->v_mount; 676 677 relock: 678 restarts += 1; 679 error = vn_lock(fdvp, LK_EXCLUSIVE); 680 if (error) 681 goto releout; 682 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 683 VOP_UNLOCK(fdvp, 0); 684 error = vn_lock(tdvp, LK_EXCLUSIVE); 685 if (error) 686 goto releout; 687 VOP_UNLOCK(tdvp, 0); 688 goto relock; 689 } 690 /* 691 * Re-resolve fvp to be certain it still exists and fetch the 692 * correct vnode. 693 */ 694 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 695 if (de == NULL) { 696 VOP_UNLOCK(fdvp, 0); 697 VOP_UNLOCK(tdvp, 0); 698 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 699 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 700 error = EINVAL; 701 else 702 error = ENOENT; 703 goto releout; 704 } 705 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 706 if (error != 0) { 707 VOP_UNLOCK(fdvp, 0); 708 VOP_UNLOCK(tdvp, 0); 709 if (error != EBUSY) 710 goto releout; 711 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 712 if (error != 0) 713 goto releout; 714 VOP_UNLOCK(nvp, 0); 715 /* 716 * Concurrent rename race. 717 */ 718 if (nvp == tdvp) { 719 vrele(nvp); 720 error = EINVAL; 721 goto releout; 722 } 723 vrele(*fvpp); 724 *fvpp = nvp; 725 goto relock; 726 } 727 vrele(*fvpp); 728 *fvpp = nvp; 729 VOP_UNLOCK(*fvpp, 0); 730 /* 731 * Re-resolve tvp and acquire the vnode lock if present. 732 */ 733 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 734 /* 735 * If tvp disappeared we just carry on. 736 */ 737 if (de == NULL && *tvpp != NULL) { 738 vrele(*tvpp); 739 *tvpp = NULL; 740 } 741 /* 742 * Get the tvp ino if the lookup succeeded. We may have to restart 743 * if the non-blocking acquire fails. 744 */ 745 if (de != NULL) { 746 nvp = NULL; 747 error = tmpfs_alloc_vp(mp, de->td_node, 748 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 749 if (*tvpp != NULL) 750 vrele(*tvpp); 751 *tvpp = nvp; 752 if (error != 0) { 753 VOP_UNLOCK(fdvp, 0); 754 VOP_UNLOCK(tdvp, 0); 755 if (error != EBUSY) 756 goto releout; 757 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 758 &nvp); 759 if (error != 0) 760 goto releout; 761 VOP_UNLOCK(nvp, 0); 762 /* 763 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 764 */ 765 if (nvp == fdvp) { 766 error = ENOTEMPTY; 767 goto releout; 768 } 769 goto relock; 770 } 771 } 772 tmpfs_rename_restarts += restarts; 773 774 return (0); 775 776 releout: 777 vrele(fdvp); 778 vrele(*fvpp); 779 vrele(tdvp); 780 if (*tvpp != NULL) 781 vrele(*tvpp); 782 tmpfs_rename_restarts += restarts; 783 784 return (error); 785 } 786 787 static int 788 tmpfs_rename(struct vop_rename_args *v) 789 { 790 struct vnode *fdvp = v->a_fdvp; 791 struct vnode *fvp = v->a_fvp; 792 struct componentname *fcnp = v->a_fcnp; 793 struct vnode *tdvp = v->a_tdvp; 794 struct vnode *tvp = v->a_tvp; 795 struct componentname *tcnp = v->a_tcnp; 796 struct mount *mp = NULL; 797 798 char *newname; 799 int error; 800 struct tmpfs_dirent *de; 801 struct tmpfs_mount *tmp; 802 struct tmpfs_node *fdnode; 803 struct tmpfs_node *fnode; 804 struct tmpfs_node *tnode; 805 struct tmpfs_node *tdnode; 806 807 MPASS(VOP_ISLOCKED(tdvp)); 808 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 809 MPASS(fcnp->cn_flags & HASBUF); 810 MPASS(tcnp->cn_flags & HASBUF); 811 812 /* Disallow cross-device renames. 813 * XXX Why isn't this done by the caller? */ 814 if (fvp->v_mount != tdvp->v_mount || 815 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 816 error = EXDEV; 817 goto out; 818 } 819 820 /* If source and target are the same file, there is nothing to do. */ 821 if (fvp == tvp) { 822 error = 0; 823 goto out; 824 } 825 826 /* If we need to move the directory between entries, lock the 827 * source so that we can safely operate on it. */ 828 if (fdvp != tdvp && fdvp != tvp) { 829 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 830 mp = tdvp->v_mount; 831 error = vfs_busy(mp, 0); 832 if (error != 0) { 833 mp = NULL; 834 goto out; 835 } 836 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 837 fcnp, tcnp); 838 if (error != 0) { 839 vfs_unbusy(mp); 840 return (error); 841 } 842 ASSERT_VOP_ELOCKED(fdvp, 843 "tmpfs_rename: fdvp not locked"); 844 ASSERT_VOP_ELOCKED(tdvp, 845 "tmpfs_rename: tdvp not locked"); 846 if (tvp != NULL) 847 ASSERT_VOP_ELOCKED(tvp, 848 "tmpfs_rename: tvp not locked"); 849 if (fvp == tvp) { 850 error = 0; 851 goto out_locked; 852 } 853 } 854 } 855 856 tmp = VFS_TO_TMPFS(tdvp->v_mount); 857 tdnode = VP_TO_TMPFS_DIR(tdvp); 858 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 859 fdnode = VP_TO_TMPFS_DIR(fdvp); 860 fnode = VP_TO_TMPFS_NODE(fvp); 861 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 862 863 /* Entry can disappear before we lock fdvp, 864 * also avoid manipulating '.' and '..' entries. */ 865 if (de == NULL) { 866 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 867 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 868 error = EINVAL; 869 else 870 error = ENOENT; 871 goto out_locked; 872 } 873 MPASS(de->td_node == fnode); 874 875 /* If re-naming a directory to another preexisting directory 876 * ensure that the target directory is empty so that its 877 * removal causes no side effects. 878 * Kern_rename guarantees the destination to be a directory 879 * if the source is one. */ 880 if (tvp != NULL) { 881 MPASS(tnode != NULL); 882 883 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 884 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 885 error = EPERM; 886 goto out_locked; 887 } 888 889 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 890 if (tnode->tn_size > 0) { 891 error = ENOTEMPTY; 892 goto out_locked; 893 } 894 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 895 error = ENOTDIR; 896 goto out_locked; 897 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 898 error = EISDIR; 899 goto out_locked; 900 } else { 901 MPASS(fnode->tn_type != VDIR && 902 tnode->tn_type != VDIR); 903 } 904 } 905 906 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 907 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 908 error = EPERM; 909 goto out_locked; 910 } 911 912 /* Ensure that we have enough memory to hold the new name, if it 913 * has to be changed. */ 914 if (fcnp->cn_namelen != tcnp->cn_namelen || 915 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 916 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 917 } else 918 newname = NULL; 919 920 /* If the node is being moved to another directory, we have to do 921 * the move. */ 922 if (fdnode != tdnode) { 923 /* In case we are moving a directory, we have to adjust its 924 * parent to point to the new parent. */ 925 if (de->td_node->tn_type == VDIR) { 926 struct tmpfs_node *n; 927 928 /* Ensure the target directory is not a child of the 929 * directory being moved. Otherwise, we'd end up 930 * with stale nodes. */ 931 n = tdnode; 932 /* TMPFS_LOCK garanties that no nodes are freed while 933 * traversing the list. Nodes can only be marked as 934 * removed: tn_parent == NULL. */ 935 TMPFS_LOCK(tmp); 936 TMPFS_NODE_LOCK(n); 937 while (n != n->tn_dir.tn_parent) { 938 struct tmpfs_node *parent; 939 940 if (n == fnode) { 941 TMPFS_NODE_UNLOCK(n); 942 TMPFS_UNLOCK(tmp); 943 error = EINVAL; 944 if (newname != NULL) 945 free(newname, M_TMPFSNAME); 946 goto out_locked; 947 } 948 parent = n->tn_dir.tn_parent; 949 TMPFS_NODE_UNLOCK(n); 950 if (parent == NULL) { 951 n = NULL; 952 break; 953 } 954 TMPFS_NODE_LOCK(parent); 955 if (parent->tn_dir.tn_parent == NULL) { 956 TMPFS_NODE_UNLOCK(parent); 957 n = NULL; 958 break; 959 } 960 n = parent; 961 } 962 TMPFS_UNLOCK(tmp); 963 if (n == NULL) { 964 error = EINVAL; 965 if (newname != NULL) 966 free(newname, M_TMPFSNAME); 967 goto out_locked; 968 } 969 TMPFS_NODE_UNLOCK(n); 970 971 /* Adjust the parent pointer. */ 972 TMPFS_VALIDATE_DIR(fnode); 973 TMPFS_NODE_LOCK(de->td_node); 974 de->td_node->tn_dir.tn_parent = tdnode; 975 TMPFS_NODE_UNLOCK(de->td_node); 976 977 /* As a result of changing the target of the '..' 978 * entry, the link count of the source and target 979 * directories has to be adjusted. */ 980 TMPFS_NODE_LOCK(tdnode); 981 TMPFS_ASSERT_LOCKED(tdnode); 982 tdnode->tn_links++; 983 TMPFS_NODE_UNLOCK(tdnode); 984 985 TMPFS_NODE_LOCK(fdnode); 986 TMPFS_ASSERT_LOCKED(fdnode); 987 fdnode->tn_links--; 988 TMPFS_NODE_UNLOCK(fdnode); 989 } 990 } 991 992 /* Do the move: just remove the entry from the source directory 993 * and insert it into the target one. */ 994 tmpfs_dir_detach(fdvp, de); 995 996 if (fcnp->cn_flags & DOWHITEOUT) 997 tmpfs_dir_whiteout_add(fdvp, fcnp); 998 if (tcnp->cn_flags & ISWHITEOUT) 999 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1000 1001 /* If the name has changed, we need to make it effective by changing 1002 * it in the directory entry. */ 1003 if (newname != NULL) { 1004 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1005 1006 free(de->ud.td_name, M_TMPFSNAME); 1007 de->ud.td_name = newname; 1008 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1009 1010 fnode->tn_status |= TMPFS_NODE_CHANGED; 1011 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1012 } 1013 1014 /* If we are overwriting an entry, we have to remove the old one 1015 * from the target directory. */ 1016 if (tvp != NULL) { 1017 struct tmpfs_dirent *tde; 1018 1019 /* Remove the old entry from the target directory. */ 1020 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1021 tmpfs_dir_detach(tdvp, tde); 1022 1023 /* Free the directory entry we just deleted. Note that the 1024 * node referred by it will not be removed until the vnode is 1025 * really reclaimed. */ 1026 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1027 } 1028 1029 tmpfs_dir_attach(tdvp, de); 1030 1031 if (tmpfs_use_nc(fvp)) { 1032 cache_purge(fvp); 1033 if (tvp != NULL) 1034 cache_purge(tvp); 1035 cache_purge_negative(tdvp); 1036 } 1037 1038 error = 0; 1039 1040 out_locked: 1041 if (fdvp != tdvp && fdvp != tvp) 1042 VOP_UNLOCK(fdvp, 0); 1043 1044 out: 1045 /* Release target nodes. */ 1046 /* XXX: I don't understand when tdvp can be the same as tvp, but 1047 * other code takes care of this... */ 1048 if (tdvp == tvp) 1049 vrele(tdvp); 1050 else 1051 vput(tdvp); 1052 if (tvp != NULL) 1053 vput(tvp); 1054 1055 /* Release source nodes. */ 1056 vrele(fdvp); 1057 vrele(fvp); 1058 1059 if (mp != NULL) 1060 vfs_unbusy(mp); 1061 1062 return error; 1063 } 1064 1065 static int 1066 tmpfs_mkdir(struct vop_mkdir_args *v) 1067 { 1068 struct vnode *dvp = v->a_dvp; 1069 struct vnode **vpp = v->a_vpp; 1070 struct componentname *cnp = v->a_cnp; 1071 struct vattr *vap = v->a_vap; 1072 1073 MPASS(vap->va_type == VDIR); 1074 1075 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1076 } 1077 1078 static int 1079 tmpfs_rmdir(struct vop_rmdir_args *v) 1080 { 1081 struct vnode *dvp = v->a_dvp; 1082 struct vnode *vp = v->a_vp; 1083 1084 int error; 1085 struct tmpfs_dirent *de; 1086 struct tmpfs_mount *tmp; 1087 struct tmpfs_node *dnode; 1088 struct tmpfs_node *node; 1089 1090 MPASS(VOP_ISLOCKED(dvp)); 1091 MPASS(VOP_ISLOCKED(vp)); 1092 1093 tmp = VFS_TO_TMPFS(dvp->v_mount); 1094 dnode = VP_TO_TMPFS_DIR(dvp); 1095 node = VP_TO_TMPFS_DIR(vp); 1096 1097 /* Directories with more than two entries ('.' and '..') cannot be 1098 * removed. */ 1099 if (node->tn_size > 0) { 1100 error = ENOTEMPTY; 1101 goto out; 1102 } 1103 1104 if ((dnode->tn_flags & APPEND) 1105 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1106 error = EPERM; 1107 goto out; 1108 } 1109 1110 /* This invariant holds only if we are not trying to remove "..". 1111 * We checked for that above so this is safe now. */ 1112 MPASS(node->tn_dir.tn_parent == dnode); 1113 1114 /* Get the directory entry associated with node (vp). This was 1115 * filled by tmpfs_lookup while looking up the entry. */ 1116 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1117 MPASS(TMPFS_DIRENT_MATCHES(de, 1118 v->a_cnp->cn_nameptr, 1119 v->a_cnp->cn_namelen)); 1120 1121 /* Check flags to see if we are allowed to remove the directory. */ 1122 if ((dnode->tn_flags & APPEND) != 0 || 1123 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1124 error = EPERM; 1125 goto out; 1126 } 1127 1128 1129 /* Detach the directory entry from the directory (dnode). */ 1130 tmpfs_dir_detach(dvp, de); 1131 if (v->a_cnp->cn_flags & DOWHITEOUT) 1132 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1133 1134 /* No vnode should be allocated for this entry from this point */ 1135 TMPFS_NODE_LOCK(node); 1136 node->tn_links--; 1137 node->tn_dir.tn_parent = NULL; 1138 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1139 TMPFS_NODE_MODIFIED; 1140 1141 TMPFS_NODE_UNLOCK(node); 1142 1143 TMPFS_NODE_LOCK(dnode); 1144 dnode->tn_links--; 1145 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1146 TMPFS_NODE_MODIFIED; 1147 TMPFS_NODE_UNLOCK(dnode); 1148 1149 if (tmpfs_use_nc(dvp)) { 1150 cache_purge(dvp); 1151 cache_purge(vp); 1152 } 1153 1154 /* Free the directory entry we just deleted. Note that the node 1155 * referred by it will not be removed until the vnode is really 1156 * reclaimed. */ 1157 tmpfs_free_dirent(tmp, de); 1158 1159 /* Release the deleted vnode (will destroy the node, notify 1160 * interested parties and clean it from the cache). */ 1161 1162 dnode->tn_status |= TMPFS_NODE_CHANGED; 1163 tmpfs_update(dvp); 1164 1165 error = 0; 1166 1167 out: 1168 return error; 1169 } 1170 1171 static int 1172 tmpfs_symlink(struct vop_symlink_args *v) 1173 { 1174 struct vnode *dvp = v->a_dvp; 1175 struct vnode **vpp = v->a_vpp; 1176 struct componentname *cnp = v->a_cnp; 1177 struct vattr *vap = v->a_vap; 1178 char *target = v->a_target; 1179 1180 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1181 MPASS(vap->va_type == VLNK); 1182 #else 1183 vap->va_type = VLNK; 1184 #endif 1185 1186 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1187 } 1188 1189 static int 1190 tmpfs_readdir(struct vop_readdir_args *v) 1191 { 1192 struct vnode *vp = v->a_vp; 1193 struct uio *uio = v->a_uio; 1194 int *eofflag = v->a_eofflag; 1195 u_long **cookies = v->a_cookies; 1196 int *ncookies = v->a_ncookies; 1197 1198 int error; 1199 ssize_t startresid; 1200 int maxcookies; 1201 struct tmpfs_node *node; 1202 1203 /* This operation only makes sense on directory nodes. */ 1204 if (vp->v_type != VDIR) 1205 return ENOTDIR; 1206 1207 maxcookies = 0; 1208 node = VP_TO_TMPFS_DIR(vp); 1209 1210 startresid = uio->uio_resid; 1211 1212 /* Allocate cookies for NFS and compat modules. */ 1213 if (cookies != NULL && ncookies != NULL) { 1214 maxcookies = howmany(node->tn_size, 1215 sizeof(struct tmpfs_dirent)) + 2; 1216 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1217 M_WAITOK); 1218 *ncookies = 0; 1219 } 1220 1221 if (cookies == NULL) 1222 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1223 else 1224 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1225 ncookies); 1226 1227 /* Buffer was filled without hitting EOF. */ 1228 if (error == EJUSTRETURN) 1229 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1230 1231 if (error != 0 && cookies != NULL && ncookies != NULL) { 1232 free(*cookies, M_TEMP); 1233 *cookies = NULL; 1234 *ncookies = 0; 1235 } 1236 1237 if (eofflag != NULL) 1238 *eofflag = 1239 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1240 1241 return error; 1242 } 1243 1244 static int 1245 tmpfs_readlink(struct vop_readlink_args *v) 1246 { 1247 struct vnode *vp = v->a_vp; 1248 struct uio *uio = v->a_uio; 1249 1250 int error; 1251 struct tmpfs_node *node; 1252 1253 MPASS(uio->uio_offset == 0); 1254 MPASS(vp->v_type == VLNK); 1255 1256 node = VP_TO_TMPFS_NODE(vp); 1257 1258 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1259 uio); 1260 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1261 1262 return (error); 1263 } 1264 1265 static int 1266 tmpfs_inactive(struct vop_inactive_args *v) 1267 { 1268 struct vnode *vp; 1269 struct tmpfs_node *node; 1270 1271 vp = v->a_vp; 1272 node = VP_TO_TMPFS_NODE(vp); 1273 if (node->tn_links == 0) 1274 vrecycle(vp); 1275 else 1276 tmpfs_check_mtime(vp); 1277 return (0); 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 if (tmpfs_use_nc(vp)) 1297 cache_purge(vp); 1298 1299 TMPFS_NODE_LOCK(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 int 1318 tmpfs_print(struct vop_print_args *v) 1319 { 1320 struct vnode *vp = v->a_vp; 1321 1322 struct tmpfs_node *node; 1323 1324 node = VP_TO_TMPFS_NODE(vp); 1325 1326 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1327 node, node->tn_flags, (uintmax_t)node->tn_links); 1328 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1329 node->tn_mode, node->tn_uid, node->tn_gid, 1330 (intmax_t)node->tn_size, node->tn_status); 1331 1332 if (vp->v_type == VFIFO) 1333 fifo_printinfo(vp); 1334 1335 printf("\n"); 1336 1337 return 0; 1338 } 1339 1340 static int 1341 tmpfs_pathconf(struct vop_pathconf_args *v) 1342 { 1343 int name = v->a_name; 1344 register_t *retval = v->a_retval; 1345 1346 int error; 1347 1348 error = 0; 1349 1350 switch (name) { 1351 case _PC_NO_TRUNC: 1352 *retval = 1; 1353 break; 1354 1355 case _PC_SYNC_IO: 1356 *retval = 1; 1357 break; 1358 1359 case _PC_FILESIZEBITS: 1360 *retval = 64; 1361 break; 1362 1363 default: 1364 error = vop_stdpathconf(v); 1365 } 1366 1367 return error; 1368 } 1369 1370 static int 1371 tmpfs_vptofh(struct vop_vptofh_args *ap) 1372 { 1373 struct tmpfs_fid *tfhp; 1374 struct tmpfs_node *node; 1375 1376 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1377 node = VP_TO_TMPFS_NODE(ap->a_vp); 1378 1379 tfhp->tf_len = sizeof(struct tmpfs_fid); 1380 tfhp->tf_id = node->tn_id; 1381 tfhp->tf_gen = node->tn_gen; 1382 1383 return (0); 1384 } 1385 1386 static int 1387 tmpfs_whiteout(struct vop_whiteout_args *ap) 1388 { 1389 struct vnode *dvp = ap->a_dvp; 1390 struct componentname *cnp = ap->a_cnp; 1391 struct tmpfs_dirent *de; 1392 1393 switch (ap->a_flags) { 1394 case LOOKUP: 1395 return (0); 1396 case CREATE: 1397 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1398 if (de != NULL) 1399 return (de->td_node == NULL ? 0 : EEXIST); 1400 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1401 case DELETE: 1402 tmpfs_dir_whiteout_remove(dvp, cnp); 1403 return (0); 1404 default: 1405 panic("tmpfs_whiteout: unknown op"); 1406 } 1407 } 1408 1409 static int 1410 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1411 struct tmpfs_dirent **pde) 1412 { 1413 struct tmpfs_dir_cursor dc; 1414 struct tmpfs_dirent *de; 1415 1416 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1417 de = tmpfs_dir_next(tnp, &dc)) { 1418 if (de->td_node == tn) { 1419 *pde = de; 1420 return (0); 1421 } 1422 } 1423 return (ENOENT); 1424 } 1425 1426 static int 1427 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1428 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1429 { 1430 struct tmpfs_dirent *de; 1431 int error, i; 1432 1433 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1434 dvp); 1435 if (error != 0) 1436 return (error); 1437 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1438 if (error == 0) { 1439 i = *buflen; 1440 i -= de->td_namelen; 1441 if (i < 0) { 1442 error = ENOMEM; 1443 } else { 1444 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1445 *buflen = i; 1446 } 1447 } 1448 if (error == 0) { 1449 if (vp != *dvp) 1450 VOP_UNLOCK(*dvp, 0); 1451 } else { 1452 if (vp != *dvp) 1453 vput(*dvp); 1454 else 1455 vrele(vp); 1456 } 1457 return (error); 1458 } 1459 1460 static int 1461 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1462 { 1463 struct vnode *vp, **dvp; 1464 struct tmpfs_node *tn, *tnp, *tnp1; 1465 struct tmpfs_dirent *de; 1466 struct tmpfs_mount *tm; 1467 char *buf; 1468 int *buflen; 1469 int error; 1470 1471 vp = ap->a_vp; 1472 dvp = ap->a_vpp; 1473 buf = ap->a_buf; 1474 buflen = ap->a_buflen; 1475 1476 tm = VFS_TO_TMPFS(vp->v_mount); 1477 tn = VP_TO_TMPFS_NODE(vp); 1478 if (tn->tn_type == VDIR) { 1479 tnp = tn->tn_dir.tn_parent; 1480 if (tnp == NULL) 1481 return (ENOENT); 1482 tmpfs_ref_node(tnp); 1483 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1484 buflen, dvp); 1485 tmpfs_free_node(tm, tnp); 1486 return (error); 1487 } 1488 restart: 1489 TMPFS_LOCK(tm); 1490 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1491 if (tnp->tn_type != VDIR) 1492 continue; 1493 TMPFS_NODE_LOCK(tnp); 1494 tmpfs_ref_node_locked(tnp); 1495 1496 /* 1497 * tn_vnode cannot be instantiated while we hold the 1498 * node lock, so the directory cannot be changed while 1499 * we iterate over it. Do this to avoid instantiating 1500 * vnode for directories which cannot point to our 1501 * node. 1502 */ 1503 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1504 &de) : 0; 1505 1506 if (error == 0) { 1507 TMPFS_NODE_UNLOCK(tnp); 1508 TMPFS_UNLOCK(tm); 1509 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1510 dvp); 1511 if (error == 0) { 1512 tmpfs_free_node(tm, tnp); 1513 return (0); 1514 } 1515 if ((vp->v_iflag & VI_DOOMED) != 0) { 1516 tmpfs_free_node(tm, tnp); 1517 return (ENOENT); 1518 } 1519 TMPFS_LOCK(tm); 1520 TMPFS_NODE_LOCK(tnp); 1521 } 1522 if (tmpfs_free_node_locked(tm, tnp, false)) { 1523 goto restart; 1524 } else { 1525 KASSERT(tnp->tn_refcount > 0, 1526 ("node %p refcount zero", tnp)); 1527 tnp1 = LIST_NEXT(tnp, tn_entries); 1528 TMPFS_NODE_UNLOCK(tnp); 1529 } 1530 } 1531 TMPFS_UNLOCK(tm); 1532 return (ENOENT); 1533 } 1534 1535 /* 1536 * Vnode operations vector used for files stored in a tmpfs file system. 1537 */ 1538 struct vop_vector tmpfs_vnodeop_entries = { 1539 .vop_default = &default_vnodeops, 1540 .vop_lookup = vfs_cache_lookup, 1541 .vop_cachedlookup = tmpfs_cached_lookup, 1542 .vop_create = tmpfs_create, 1543 .vop_mknod = tmpfs_mknod, 1544 .vop_open = tmpfs_open, 1545 .vop_close = tmpfs_close, 1546 .vop_access = tmpfs_access, 1547 .vop_getattr = tmpfs_getattr, 1548 .vop_setattr = tmpfs_setattr, 1549 .vop_read = tmpfs_read, 1550 .vop_write = tmpfs_write, 1551 .vop_fsync = tmpfs_fsync, 1552 .vop_remove = tmpfs_remove, 1553 .vop_link = tmpfs_link, 1554 .vop_rename = tmpfs_rename, 1555 .vop_mkdir = tmpfs_mkdir, 1556 .vop_rmdir = tmpfs_rmdir, 1557 .vop_symlink = tmpfs_symlink, 1558 .vop_readdir = tmpfs_readdir, 1559 .vop_readlink = tmpfs_readlink, 1560 .vop_inactive = tmpfs_inactive, 1561 .vop_reclaim = tmpfs_reclaim, 1562 .vop_print = tmpfs_print, 1563 .vop_pathconf = tmpfs_pathconf, 1564 .vop_vptofh = tmpfs_vptofh, 1565 .vop_whiteout = tmpfs_whiteout, 1566 .vop_bmap = VOP_EOPNOTSUPP, 1567 .vop_vptocnp = tmpfs_vptocnp, 1568 }; 1569 1570 /* 1571 * Same vector for mounts which do not use namecache. 1572 */ 1573 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1574 .vop_default = &tmpfs_vnodeop_entries, 1575 .vop_lookup = tmpfs_lookup, 1576 }; 1577