tmpfs_vnops.c revision 268613
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: head/sys/fs/tmpfs/tmpfs_vnops.c 268613 2014-07-14 09:13:56Z kib $"); 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 64SYSCTL_DECL(_vfs_tmpfs); 65 66static volatile int tmpfs_rename_restarts; 67SYSCTL_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 71static int 72tmpfs_lookup(struct vop_cachedlookup_args *v) 73{ 74 struct vnode *dvp = v->a_dvp; 75 struct vnode **vpp = v->a_vpp; 76 struct componentname *cnp = v->a_cnp; 77 78 int error; 79 struct tmpfs_dirent *de; 80 struct tmpfs_node *dnode; 81 82 dnode = VP_TO_TMPFS_DIR(dvp); 83 *vpp = NULLVP; 84 85 /* Check accessibility of requested node as a first step. */ 86 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 87 if (error != 0) 88 goto out; 89 90 /* We cannot be requesting the parent directory of the root node. */ 91 MPASS(IMPLIES(dnode->tn_type == VDIR && 92 dnode->tn_dir.tn_parent == dnode, 93 !(cnp->cn_flags & ISDOTDOT))); 94 95 TMPFS_ASSERT_LOCKED(dnode); 96 if (dnode->tn_dir.tn_parent == NULL) { 97 error = ENOENT; 98 goto out; 99 } 100 if (cnp->cn_flags & ISDOTDOT) { 101 int ltype = 0; 102 103 ltype = VOP_ISLOCKED(dvp); 104 vhold(dvp); 105 VOP_UNLOCK(dvp, 0); 106 /* Allocate a new vnode on the matching entry. */ 107 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 108 cnp->cn_lkflags, vpp); 109 110 vn_lock(dvp, ltype | LK_RETRY); 111 vdrop(dvp); 112 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 113 VREF(dvp); 114 *vpp = dvp; 115 error = 0; 116 } else { 117 de = tmpfs_dir_lookup(dnode, NULL, cnp); 118 if (de != NULL && de->td_node == NULL) 119 cnp->cn_flags |= ISWHITEOUT; 120 if (de == NULL || de->td_node == NULL) { 121 /* The entry was not found in the directory. 122 * This is OK if we are creating or renaming an 123 * entry and are working on the last component of 124 * the path name. */ 125 if ((cnp->cn_flags & ISLASTCN) && 126 (cnp->cn_nameiop == CREATE || \ 127 cnp->cn_nameiop == RENAME || 128 (cnp->cn_nameiop == DELETE && 129 cnp->cn_flags & DOWHITEOUT && 130 cnp->cn_flags & ISWHITEOUT))) { 131 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 132 cnp->cn_thread); 133 if (error != 0) 134 goto out; 135 136 /* Keep the component name in the buffer for 137 * future uses. */ 138 cnp->cn_flags |= SAVENAME; 139 140 error = EJUSTRETURN; 141 } else 142 error = ENOENT; 143 } else { 144 struct tmpfs_node *tnode; 145 146 /* The entry was found, so get its associated 147 * tmpfs_node. */ 148 tnode = de->td_node; 149 150 /* If we are not at the last path component and 151 * found a non-directory or non-link entry (which 152 * may itself be pointing to a directory), raise 153 * an error. */ 154 if ((tnode->tn_type != VDIR && 155 tnode->tn_type != VLNK) && 156 !(cnp->cn_flags & ISLASTCN)) { 157 error = ENOTDIR; 158 goto out; 159 } 160 161 /* If we are deleting or renaming the entry, keep 162 * track of its tmpfs_dirent so that it can be 163 * easily deleted later. */ 164 if ((cnp->cn_flags & ISLASTCN) && 165 (cnp->cn_nameiop == DELETE || 166 cnp->cn_nameiop == RENAME)) { 167 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 168 cnp->cn_thread); 169 if (error != 0) 170 goto out; 171 172 /* Allocate a new vnode on the matching entry. */ 173 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 174 cnp->cn_lkflags, vpp); 175 if (error != 0) 176 goto out; 177 178 if ((dnode->tn_mode & S_ISTXT) && 179 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 180 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 181 error = EPERM; 182 vput(*vpp); 183 *vpp = NULL; 184 goto out; 185 } 186 cnp->cn_flags |= SAVENAME; 187 } else { 188 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 189 cnp->cn_lkflags, vpp); 190 } 191 } 192 } 193 194 /* Store the result of this lookup in the cache. Avoid this if the 195 * request was for creation, as it does not improve timings on 196 * emprical tests. */ 197 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 198 cache_enter(dvp, *vpp, cnp); 199 200out: 201 /* If there were no errors, *vpp cannot be null and it must be 202 * locked. */ 203 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 204 205 return error; 206} 207 208static int 209tmpfs_create(struct vop_create_args *v) 210{ 211 struct vnode *dvp = v->a_dvp; 212 struct vnode **vpp = v->a_vpp; 213 struct componentname *cnp = v->a_cnp; 214 struct vattr *vap = v->a_vap; 215 216 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 217 218 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 219} 220 221static int 222tmpfs_mknod(struct vop_mknod_args *v) 223{ 224 struct vnode *dvp = v->a_dvp; 225 struct vnode **vpp = v->a_vpp; 226 struct componentname *cnp = v->a_cnp; 227 struct vattr *vap = v->a_vap; 228 229 if (vap->va_type != VBLK && vap->va_type != VCHR && 230 vap->va_type != VFIFO) 231 return EINVAL; 232 233 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 234} 235 236static int 237tmpfs_open(struct vop_open_args *v) 238{ 239 struct vnode *vp = v->a_vp; 240 int mode = v->a_mode; 241 242 int error; 243 struct tmpfs_node *node; 244 245 MPASS(VOP_ISLOCKED(vp)); 246 247 node = VP_TO_TMPFS_NODE(vp); 248 249 /* The file is still active but all its names have been removed 250 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 251 * it is about to die. */ 252 if (node->tn_links < 1) 253 return (ENOENT); 254 255 /* If the file is marked append-only, deny write requests. */ 256 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 257 error = EPERM; 258 else { 259 error = 0; 260 /* For regular files, the call below is nop. */ 261 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 262 OBJ_DEAD) == 0, ("dead object")); 263 vnode_create_vobject(vp, node->tn_size, v->a_td); 264 } 265 266 MPASS(VOP_ISLOCKED(vp)); 267 return error; 268} 269 270static int 271tmpfs_close(struct vop_close_args *v) 272{ 273 struct vnode *vp = v->a_vp; 274 275 /* Update node times. */ 276 tmpfs_update(vp); 277 278 return (0); 279} 280 281int 282tmpfs_access(struct vop_access_args *v) 283{ 284 struct vnode *vp = v->a_vp; 285 accmode_t accmode = v->a_accmode; 286 struct ucred *cred = v->a_cred; 287 288 int error; 289 struct tmpfs_node *node; 290 291 MPASS(VOP_ISLOCKED(vp)); 292 293 node = VP_TO_TMPFS_NODE(vp); 294 295 switch (vp->v_type) { 296 case VDIR: 297 /* FALLTHROUGH */ 298 case VLNK: 299 /* FALLTHROUGH */ 300 case VREG: 301 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 302 error = EROFS; 303 goto out; 304 } 305 break; 306 307 case VBLK: 308 /* FALLTHROUGH */ 309 case VCHR: 310 /* FALLTHROUGH */ 311 case VSOCK: 312 /* FALLTHROUGH */ 313 case VFIFO: 314 break; 315 316 default: 317 error = EINVAL; 318 goto out; 319 } 320 321 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 322 error = EPERM; 323 goto out; 324 } 325 326 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 327 node->tn_gid, accmode, cred, NULL); 328 329out: 330 MPASS(VOP_ISLOCKED(vp)); 331 332 return error; 333} 334 335int 336tmpfs_getattr(struct vop_getattr_args *v) 337{ 338 struct vnode *vp = v->a_vp; 339 struct vattr *vap = v->a_vap; 340 341 struct tmpfs_node *node; 342 343 node = VP_TO_TMPFS_NODE(vp); 344 345 tmpfs_update(vp); 346 347 vap->va_type = vp->v_type; 348 vap->va_mode = node->tn_mode; 349 vap->va_nlink = node->tn_links; 350 vap->va_uid = node->tn_uid; 351 vap->va_gid = node->tn_gid; 352 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 353 vap->va_fileid = node->tn_id; 354 vap->va_size = node->tn_size; 355 vap->va_blocksize = PAGE_SIZE; 356 vap->va_atime = node->tn_atime; 357 vap->va_mtime = node->tn_mtime; 358 vap->va_ctime = node->tn_ctime; 359 vap->va_birthtime = node->tn_birthtime; 360 vap->va_gen = node->tn_gen; 361 vap->va_flags = node->tn_flags; 362 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 363 node->tn_rdev : NODEV; 364 vap->va_bytes = round_page(node->tn_size); 365 vap->va_filerev = 0; 366 367 return 0; 368} 369 370int 371tmpfs_setattr(struct vop_setattr_args *v) 372{ 373 struct vnode *vp = v->a_vp; 374 struct vattr *vap = v->a_vap; 375 struct ucred *cred = v->a_cred; 376 struct thread *td = curthread; 377 378 int error; 379 380 MPASS(VOP_ISLOCKED(vp)); 381 382 error = 0; 383 384 /* Abort if any unsettable attribute is given. */ 385 if (vap->va_type != VNON || 386 vap->va_nlink != VNOVAL || 387 vap->va_fsid != VNOVAL || 388 vap->va_fileid != VNOVAL || 389 vap->va_blocksize != VNOVAL || 390 vap->va_gen != VNOVAL || 391 vap->va_rdev != VNOVAL || 392 vap->va_bytes != VNOVAL) 393 error = EINVAL; 394 395 if (error == 0 && (vap->va_flags != VNOVAL)) 396 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 397 398 if (error == 0 && (vap->va_size != VNOVAL)) 399 error = tmpfs_chsize(vp, vap->va_size, cred, td); 400 401 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 402 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 403 404 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 405 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 406 407 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 408 vap->va_atime.tv_nsec != VNOVAL) || 409 (vap->va_mtime.tv_sec != VNOVAL && 410 vap->va_mtime.tv_nsec != VNOVAL) || 411 (vap->va_birthtime.tv_sec != VNOVAL && 412 vap->va_birthtime.tv_nsec != VNOVAL))) 413 error = tmpfs_chtimes(vp, vap, cred, td); 414 415 /* Update the node times. We give preference to the error codes 416 * generated by this function rather than the ones that may arise 417 * from tmpfs_update. */ 418 tmpfs_update(vp); 419 420 MPASS(VOP_ISLOCKED(vp)); 421 422 return error; 423} 424 425static int 426tmpfs_read(struct vop_read_args *v) 427{ 428 struct vnode *vp; 429 struct uio *uio; 430 struct tmpfs_node *node; 431 432 vp = v->a_vp; 433 if (vp->v_type != VREG) 434 return (EISDIR); 435 uio = v->a_uio; 436 if (uio->uio_offset < 0) 437 return (EINVAL); 438 node = VP_TO_TMPFS_NODE(vp); 439 node->tn_status |= TMPFS_NODE_ACCESSED; 440 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 441} 442 443static int 444tmpfs_write(struct vop_write_args *v) 445{ 446 struct vnode *vp; 447 struct uio *uio; 448 struct tmpfs_node *node; 449 off_t oldsize; 450 int error, ioflag; 451 boolean_t extended; 452 453 vp = v->a_vp; 454 uio = v->a_uio; 455 ioflag = v->a_ioflag; 456 error = 0; 457 node = VP_TO_TMPFS_NODE(vp); 458 oldsize = node->tn_size; 459 460 if (uio->uio_offset < 0 || vp->v_type != VREG) 461 return (EINVAL); 462 if (uio->uio_resid == 0) 463 return (0); 464 if (ioflag & IO_APPEND) 465 uio->uio_offset = node->tn_size; 466 if (uio->uio_offset + uio->uio_resid > 467 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 468 return (EFBIG); 469 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 470 return (EFBIG); 471 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 472 if (extended) { 473 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 474 FALSE); 475 if (error != 0) 476 goto out; 477 } 478 479 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 480 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 481 (extended ? TMPFS_NODE_CHANGED : 0); 482 if (node->tn_mode & (S_ISUID | S_ISGID)) { 483 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 484 node->tn_mode &= ~(S_ISUID | S_ISGID); 485 } 486 if (error != 0) 487 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 488 489out: 490 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 491 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 492 493 return (error); 494} 495 496static int 497tmpfs_fsync(struct vop_fsync_args *v) 498{ 499 struct vnode *vp = v->a_vp; 500 501 MPASS(VOP_ISLOCKED(vp)); 502 503 tmpfs_update(vp); 504 505 return 0; 506} 507 508static int 509tmpfs_remove(struct vop_remove_args *v) 510{ 511 struct vnode *dvp = v->a_dvp; 512 struct vnode *vp = v->a_vp; 513 514 int error; 515 struct tmpfs_dirent *de; 516 struct tmpfs_mount *tmp; 517 struct tmpfs_node *dnode; 518 struct tmpfs_node *node; 519 520 MPASS(VOP_ISLOCKED(dvp)); 521 MPASS(VOP_ISLOCKED(vp)); 522 523 if (vp->v_type == VDIR) { 524 error = EISDIR; 525 goto out; 526 } 527 528 dnode = VP_TO_TMPFS_DIR(dvp); 529 node = VP_TO_TMPFS_NODE(vp); 530 tmp = VFS_TO_TMPFS(vp->v_mount); 531 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 532 MPASS(de != NULL); 533 534 /* Files marked as immutable or append-only cannot be deleted. */ 535 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 536 (dnode->tn_flags & APPEND)) { 537 error = EPERM; 538 goto out; 539 } 540 541 /* Remove the entry from the directory; as it is a file, we do not 542 * have to change the number of hard links of the directory. */ 543 tmpfs_dir_detach(dvp, de); 544 if (v->a_cnp->cn_flags & DOWHITEOUT) 545 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 546 547 /* Free the directory entry we just deleted. Note that the node 548 * referred by it will not be removed until the vnode is really 549 * reclaimed. */ 550 tmpfs_free_dirent(tmp, de); 551 552 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 553 error = 0; 554 555out: 556 557 return error; 558} 559 560static int 561tmpfs_link(struct vop_link_args *v) 562{ 563 struct vnode *dvp = v->a_tdvp; 564 struct vnode *vp = v->a_vp; 565 struct componentname *cnp = v->a_cnp; 566 567 int error; 568 struct tmpfs_dirent *de; 569 struct tmpfs_node *node; 570 571 MPASS(VOP_ISLOCKED(dvp)); 572 MPASS(cnp->cn_flags & HASBUF); 573 MPASS(dvp != vp); /* XXX When can this be false? */ 574 575 /* XXX: Why aren't the following two tests done by the caller? */ 576 577 /* Hard links of directories are forbidden. */ 578 if (vp->v_type == VDIR) { 579 error = EPERM; 580 goto out; 581 } 582 583 /* Cannot create cross-device links. */ 584 if (dvp->v_mount != vp->v_mount) { 585 error = EXDEV; 586 goto out; 587 } 588 589 node = VP_TO_TMPFS_NODE(vp); 590 591 /* Ensure that we do not overflow the maximum number of links imposed 592 * by the system. */ 593 MPASS(node->tn_links <= LINK_MAX); 594 if (node->tn_links == LINK_MAX) { 595 error = EMLINK; 596 goto out; 597 } 598 599 /* We cannot create links of files marked immutable or append-only. */ 600 if (node->tn_flags & (IMMUTABLE | APPEND)) { 601 error = EPERM; 602 goto out; 603 } 604 605 /* Allocate a new directory entry to represent the node. */ 606 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 607 cnp->cn_nameptr, cnp->cn_namelen, &de); 608 if (error != 0) 609 goto out; 610 611 /* Insert the new directory entry into the appropriate directory. */ 612 if (cnp->cn_flags & ISWHITEOUT) 613 tmpfs_dir_whiteout_remove(dvp, cnp); 614 tmpfs_dir_attach(dvp, de); 615 616 /* vp link count has changed, so update node times. */ 617 node->tn_status |= TMPFS_NODE_CHANGED; 618 tmpfs_update(vp); 619 620 error = 0; 621 622out: 623 return error; 624} 625 626/* 627 * We acquire all but fdvp locks using non-blocking acquisitions. If we 628 * fail to acquire any lock in the path we will drop all held locks, 629 * acquire the new lock in a blocking fashion, and then release it and 630 * restart the rename. This acquire/release step ensures that we do not 631 * spin on a lock waiting for release. On error release all vnode locks 632 * and decrement references the way tmpfs_rename() would do. 633 */ 634static int 635tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 636 struct vnode *tdvp, struct vnode **tvpp, 637 struct componentname *fcnp, struct componentname *tcnp) 638{ 639 struct vnode *nvp; 640 struct mount *mp; 641 struct tmpfs_dirent *de; 642 int error, restarts = 0; 643 644 VOP_UNLOCK(tdvp, 0); 645 if (*tvpp != NULL && *tvpp != tdvp) 646 VOP_UNLOCK(*tvpp, 0); 647 mp = fdvp->v_mount; 648 649relock: 650 restarts += 1; 651 error = vn_lock(fdvp, LK_EXCLUSIVE); 652 if (error) 653 goto releout; 654 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 655 VOP_UNLOCK(fdvp, 0); 656 error = vn_lock(tdvp, LK_EXCLUSIVE); 657 if (error) 658 goto releout; 659 VOP_UNLOCK(tdvp, 0); 660 goto relock; 661 } 662 /* 663 * Re-resolve fvp to be certain it still exists and fetch the 664 * correct vnode. 665 */ 666 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 667 if (de == NULL) { 668 VOP_UNLOCK(fdvp, 0); 669 VOP_UNLOCK(tdvp, 0); 670 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 671 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 672 error = EINVAL; 673 else 674 error = ENOENT; 675 goto releout; 676 } 677 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 678 if (error != 0) { 679 VOP_UNLOCK(fdvp, 0); 680 VOP_UNLOCK(tdvp, 0); 681 if (error != EBUSY) 682 goto releout; 683 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 684 if (error != 0) 685 goto releout; 686 VOP_UNLOCK(nvp, 0); 687 /* 688 * Concurrent rename race. 689 */ 690 if (nvp == tdvp) { 691 vrele(nvp); 692 error = EINVAL; 693 goto releout; 694 } 695 vrele(*fvpp); 696 *fvpp = nvp; 697 goto relock; 698 } 699 vrele(*fvpp); 700 *fvpp = nvp; 701 VOP_UNLOCK(*fvpp, 0); 702 /* 703 * Re-resolve tvp and acquire the vnode lock if present. 704 */ 705 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 706 /* 707 * If tvp disappeared we just carry on. 708 */ 709 if (de == NULL && *tvpp != NULL) { 710 vrele(*tvpp); 711 *tvpp = NULL; 712 } 713 /* 714 * Get the tvp ino if the lookup succeeded. We may have to restart 715 * if the non-blocking acquire fails. 716 */ 717 if (de != NULL) { 718 nvp = NULL; 719 error = tmpfs_alloc_vp(mp, de->td_node, 720 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 721 if (*tvpp != NULL) 722 vrele(*tvpp); 723 *tvpp = nvp; 724 if (error != 0) { 725 VOP_UNLOCK(fdvp, 0); 726 VOP_UNLOCK(tdvp, 0); 727 if (error != EBUSY) 728 goto releout; 729 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 730 &nvp); 731 if (error != 0) 732 goto releout; 733 VOP_UNLOCK(nvp, 0); 734 /* 735 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 736 */ 737 if (nvp == fdvp) { 738 error = ENOTEMPTY; 739 goto releout; 740 } 741 goto relock; 742 } 743 } 744 tmpfs_rename_restarts += restarts; 745 746 return (0); 747 748releout: 749 vrele(fdvp); 750 vrele(*fvpp); 751 vrele(tdvp); 752 if (*tvpp != NULL) 753 vrele(*tvpp); 754 tmpfs_rename_restarts += restarts; 755 756 return (error); 757} 758 759static int 760tmpfs_rename(struct vop_rename_args *v) 761{ 762 struct vnode *fdvp = v->a_fdvp; 763 struct vnode *fvp = v->a_fvp; 764 struct componentname *fcnp = v->a_fcnp; 765 struct vnode *tdvp = v->a_tdvp; 766 struct vnode *tvp = v->a_tvp; 767 struct componentname *tcnp = v->a_tcnp; 768 struct mount *mp = NULL; 769 770 char *newname; 771 int error; 772 struct tmpfs_dirent *de; 773 struct tmpfs_mount *tmp; 774 struct tmpfs_node *fdnode; 775 struct tmpfs_node *fnode; 776 struct tmpfs_node *tnode; 777 struct tmpfs_node *tdnode; 778 779 MPASS(VOP_ISLOCKED(tdvp)); 780 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 781 MPASS(fcnp->cn_flags & HASBUF); 782 MPASS(tcnp->cn_flags & HASBUF); 783 784 /* Disallow cross-device renames. 785 * XXX Why isn't this done by the caller? */ 786 if (fvp->v_mount != tdvp->v_mount || 787 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 788 error = EXDEV; 789 goto out; 790 } 791 792 /* If source and target are the same file, there is nothing to do. */ 793 if (fvp == tvp) { 794 error = 0; 795 goto out; 796 } 797 798 /* If we need to move the directory between entries, lock the 799 * source so that we can safely operate on it. */ 800 if (fdvp != tdvp && fdvp != tvp) { 801 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 802 mp = tdvp->v_mount; 803 error = vfs_busy(mp, 0); 804 if (error != 0) { 805 mp = NULL; 806 goto out; 807 } 808 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 809 fcnp, tcnp); 810 if (error != 0) { 811 vfs_unbusy(mp); 812 return (error); 813 } 814 ASSERT_VOP_ELOCKED(fdvp, 815 "tmpfs_rename: fdvp not locked"); 816 ASSERT_VOP_ELOCKED(tdvp, 817 "tmpfs_rename: tdvp not locked"); 818 if (tvp != NULL) 819 ASSERT_VOP_ELOCKED(tvp, 820 "tmpfs_rename: tvp not locked"); 821 if (fvp == tvp) { 822 error = 0; 823 goto out_locked; 824 } 825 } 826 } 827 828 tmp = VFS_TO_TMPFS(tdvp->v_mount); 829 tdnode = VP_TO_TMPFS_DIR(tdvp); 830 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 831 fdnode = VP_TO_TMPFS_DIR(fdvp); 832 fnode = VP_TO_TMPFS_NODE(fvp); 833 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 834 835 /* Entry can disappear before we lock fdvp, 836 * also avoid manipulating '.' and '..' entries. */ 837 if (de == NULL) { 838 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 839 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 840 error = EINVAL; 841 else 842 error = ENOENT; 843 goto out_locked; 844 } 845 MPASS(de->td_node == fnode); 846 847 /* If re-naming a directory to another preexisting directory 848 * ensure that the target directory is empty so that its 849 * removal causes no side effects. 850 * Kern_rename gurantees the destination to be a directory 851 * if the source is one. */ 852 if (tvp != NULL) { 853 MPASS(tnode != NULL); 854 855 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 856 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 857 error = EPERM; 858 goto out_locked; 859 } 860 861 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 862 if (tnode->tn_size > 0) { 863 error = ENOTEMPTY; 864 goto out_locked; 865 } 866 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 867 error = ENOTDIR; 868 goto out_locked; 869 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 870 error = EISDIR; 871 goto out_locked; 872 } else { 873 MPASS(fnode->tn_type != VDIR && 874 tnode->tn_type != VDIR); 875 } 876 } 877 878 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 879 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 880 error = EPERM; 881 goto out_locked; 882 } 883 884 /* Ensure that we have enough memory to hold the new name, if it 885 * has to be changed. */ 886 if (fcnp->cn_namelen != tcnp->cn_namelen || 887 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 888 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 889 } else 890 newname = NULL; 891 892 /* If the node is being moved to another directory, we have to do 893 * the move. */ 894 if (fdnode != tdnode) { 895 /* In case we are moving a directory, we have to adjust its 896 * parent to point to the new parent. */ 897 if (de->td_node->tn_type == VDIR) { 898 struct tmpfs_node *n; 899 900 /* Ensure the target directory is not a child of the 901 * directory being moved. Otherwise, we'd end up 902 * with stale nodes. */ 903 n = tdnode; 904 /* TMPFS_LOCK garanties that no nodes are freed while 905 * traversing the list. Nodes can only be marked as 906 * removed: tn_parent == NULL. */ 907 TMPFS_LOCK(tmp); 908 TMPFS_NODE_LOCK(n); 909 while (n != n->tn_dir.tn_parent) { 910 struct tmpfs_node *parent; 911 912 if (n == fnode) { 913 TMPFS_NODE_UNLOCK(n); 914 TMPFS_UNLOCK(tmp); 915 error = EINVAL; 916 if (newname != NULL) 917 free(newname, M_TMPFSNAME); 918 goto out_locked; 919 } 920 parent = n->tn_dir.tn_parent; 921 TMPFS_NODE_UNLOCK(n); 922 if (parent == NULL) { 923 n = NULL; 924 break; 925 } 926 TMPFS_NODE_LOCK(parent); 927 if (parent->tn_dir.tn_parent == NULL) { 928 TMPFS_NODE_UNLOCK(parent); 929 n = NULL; 930 break; 931 } 932 n = parent; 933 } 934 TMPFS_UNLOCK(tmp); 935 if (n == NULL) { 936 error = EINVAL; 937 if (newname != NULL) 938 free(newname, M_TMPFSNAME); 939 goto out_locked; 940 } 941 TMPFS_NODE_UNLOCK(n); 942 943 /* Adjust the parent pointer. */ 944 TMPFS_VALIDATE_DIR(fnode); 945 TMPFS_NODE_LOCK(de->td_node); 946 de->td_node->tn_dir.tn_parent = tdnode; 947 TMPFS_NODE_UNLOCK(de->td_node); 948 949 /* As a result of changing the target of the '..' 950 * entry, the link count of the source and target 951 * directories has to be adjusted. */ 952 TMPFS_NODE_LOCK(tdnode); 953 TMPFS_ASSERT_LOCKED(tdnode); 954 tdnode->tn_links++; 955 TMPFS_NODE_UNLOCK(tdnode); 956 957 TMPFS_NODE_LOCK(fdnode); 958 TMPFS_ASSERT_LOCKED(fdnode); 959 fdnode->tn_links--; 960 TMPFS_NODE_UNLOCK(fdnode); 961 } 962 } 963 964 /* Do the move: just remove the entry from the source directory 965 * and insert it into the target one. */ 966 tmpfs_dir_detach(fdvp, de); 967 968 if (fcnp->cn_flags & DOWHITEOUT) 969 tmpfs_dir_whiteout_add(fdvp, fcnp); 970 if (tcnp->cn_flags & ISWHITEOUT) 971 tmpfs_dir_whiteout_remove(tdvp, tcnp); 972 973 /* If the name has changed, we need to make it effective by changing 974 * it in the directory entry. */ 975 if (newname != NULL) { 976 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 977 978 free(de->ud.td_name, M_TMPFSNAME); 979 de->ud.td_name = newname; 980 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 981 982 fnode->tn_status |= TMPFS_NODE_CHANGED; 983 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 984 } 985 986 /* If we are overwriting an entry, we have to remove the old one 987 * from the target directory. */ 988 if (tvp != NULL) { 989 struct tmpfs_dirent *tde; 990 991 /* Remove the old entry from the target directory. */ 992 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 993 tmpfs_dir_detach(tdvp, tde); 994 995 /* Free the directory entry we just deleted. Note that the 996 * node referred by it will not be removed until the vnode is 997 * really reclaimed. */ 998 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 999 } 1000 1001 tmpfs_dir_attach(tdvp, de); 1002 1003 cache_purge(fvp); 1004 if (tvp != NULL) 1005 cache_purge(tvp); 1006 cache_purge_negative(tdvp); 1007 1008 error = 0; 1009 1010out_locked: 1011 if (fdvp != tdvp && fdvp != tvp) 1012 VOP_UNLOCK(fdvp, 0); 1013 1014out: 1015 /* Release target nodes. */ 1016 /* XXX: I don't understand when tdvp can be the same as tvp, but 1017 * other code takes care of this... */ 1018 if (tdvp == tvp) 1019 vrele(tdvp); 1020 else 1021 vput(tdvp); 1022 if (tvp != NULL) 1023 vput(tvp); 1024 1025 /* Release source nodes. */ 1026 vrele(fdvp); 1027 vrele(fvp); 1028 1029 if (mp != NULL) 1030 vfs_unbusy(mp); 1031 1032 return error; 1033} 1034 1035static int 1036tmpfs_mkdir(struct vop_mkdir_args *v) 1037{ 1038 struct vnode *dvp = v->a_dvp; 1039 struct vnode **vpp = v->a_vpp; 1040 struct componentname *cnp = v->a_cnp; 1041 struct vattr *vap = v->a_vap; 1042 1043 MPASS(vap->va_type == VDIR); 1044 1045 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1046} 1047 1048static int 1049tmpfs_rmdir(struct vop_rmdir_args *v) 1050{ 1051 struct vnode *dvp = v->a_dvp; 1052 struct vnode *vp = v->a_vp; 1053 1054 int error; 1055 struct tmpfs_dirent *de; 1056 struct tmpfs_mount *tmp; 1057 struct tmpfs_node *dnode; 1058 struct tmpfs_node *node; 1059 1060 MPASS(VOP_ISLOCKED(dvp)); 1061 MPASS(VOP_ISLOCKED(vp)); 1062 1063 tmp = VFS_TO_TMPFS(dvp->v_mount); 1064 dnode = VP_TO_TMPFS_DIR(dvp); 1065 node = VP_TO_TMPFS_DIR(vp); 1066 1067 /* Directories with more than two entries ('.' and '..') cannot be 1068 * removed. */ 1069 if (node->tn_size > 0) { 1070 error = ENOTEMPTY; 1071 goto out; 1072 } 1073 1074 if ((dnode->tn_flags & APPEND) 1075 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1076 error = EPERM; 1077 goto out; 1078 } 1079 1080 /* This invariant holds only if we are not trying to remove "..". 1081 * We checked for that above so this is safe now. */ 1082 MPASS(node->tn_dir.tn_parent == dnode); 1083 1084 /* Get the directory entry associated with node (vp). This was 1085 * filled by tmpfs_lookup while looking up the entry. */ 1086 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1087 MPASS(TMPFS_DIRENT_MATCHES(de, 1088 v->a_cnp->cn_nameptr, 1089 v->a_cnp->cn_namelen)); 1090 1091 /* Check flags to see if we are allowed to remove the directory. */ 1092 if (dnode->tn_flags & APPEND 1093 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1094 error = EPERM; 1095 goto out; 1096 } 1097 1098 1099 /* Detach the directory entry from the directory (dnode). */ 1100 tmpfs_dir_detach(dvp, de); 1101 if (v->a_cnp->cn_flags & DOWHITEOUT) 1102 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1103 1104 /* No vnode should be allocated for this entry from this point */ 1105 TMPFS_NODE_LOCK(node); 1106 TMPFS_ASSERT_ELOCKED(node); 1107 node->tn_links--; 1108 node->tn_dir.tn_parent = NULL; 1109 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1110 TMPFS_NODE_MODIFIED; 1111 1112 TMPFS_NODE_UNLOCK(node); 1113 1114 TMPFS_NODE_LOCK(dnode); 1115 TMPFS_ASSERT_ELOCKED(dnode); 1116 dnode->tn_links--; 1117 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1118 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1119 TMPFS_NODE_UNLOCK(dnode); 1120 1121 cache_purge(dvp); 1122 cache_purge(vp); 1123 1124 /* Free the directory entry we just deleted. Note that the node 1125 * referred by it will not be removed until the vnode is really 1126 * reclaimed. */ 1127 tmpfs_free_dirent(tmp, de); 1128 1129 /* Release the deleted vnode (will destroy the node, notify 1130 * interested parties and clean it from the cache). */ 1131 1132 dnode->tn_status |= TMPFS_NODE_CHANGED; 1133 tmpfs_update(dvp); 1134 1135 error = 0; 1136 1137out: 1138 return error; 1139} 1140 1141static int 1142tmpfs_symlink(struct vop_symlink_args *v) 1143{ 1144 struct vnode *dvp = v->a_dvp; 1145 struct vnode **vpp = v->a_vpp; 1146 struct componentname *cnp = v->a_cnp; 1147 struct vattr *vap = v->a_vap; 1148 char *target = v->a_target; 1149 1150#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1151 MPASS(vap->va_type == VLNK); 1152#else 1153 vap->va_type = VLNK; 1154#endif 1155 1156 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1157} 1158 1159static int 1160tmpfs_readdir(struct vop_readdir_args *v) 1161{ 1162 struct vnode *vp = v->a_vp; 1163 struct uio *uio = v->a_uio; 1164 int *eofflag = v->a_eofflag; 1165 u_long **cookies = v->a_cookies; 1166 int *ncookies = v->a_ncookies; 1167 1168 int error; 1169 ssize_t startresid; 1170 int maxcookies; 1171 struct tmpfs_node *node; 1172 1173 /* This operation only makes sense on directory nodes. */ 1174 if (vp->v_type != VDIR) 1175 return ENOTDIR; 1176 1177 maxcookies = 0; 1178 node = VP_TO_TMPFS_DIR(vp); 1179 1180 startresid = uio->uio_resid; 1181 1182 /* Allocate cookies for NFS and compat modules. */ 1183 if (cookies != NULL && ncookies != NULL) { 1184 maxcookies = howmany(node->tn_size, 1185 sizeof(struct tmpfs_dirent)) + 2; 1186 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1187 M_WAITOK); 1188 *ncookies = 0; 1189 } 1190 1191 if (cookies == NULL) 1192 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1193 else 1194 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1195 ncookies); 1196 1197 /* Buffer was filled without hitting EOF. */ 1198 if (error == EJUSTRETURN) 1199 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1200 1201 if (error != 0 && cookies != NULL) 1202 free(*cookies, M_TEMP); 1203 1204 if (eofflag != NULL) 1205 *eofflag = 1206 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1207 1208 return error; 1209} 1210 1211static int 1212tmpfs_readlink(struct vop_readlink_args *v) 1213{ 1214 struct vnode *vp = v->a_vp; 1215 struct uio *uio = v->a_uio; 1216 1217 int error; 1218 struct tmpfs_node *node; 1219 1220 MPASS(uio->uio_offset == 0); 1221 MPASS(vp->v_type == VLNK); 1222 1223 node = VP_TO_TMPFS_NODE(vp); 1224 1225 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1226 uio); 1227 node->tn_status |= TMPFS_NODE_ACCESSED; 1228 1229 return error; 1230} 1231 1232static int 1233tmpfs_inactive(struct vop_inactive_args *v) 1234{ 1235 struct vnode *vp = v->a_vp; 1236 1237 struct tmpfs_node *node; 1238 1239 node = VP_TO_TMPFS_NODE(vp); 1240 1241 if (node->tn_links == 0) 1242 vrecycle(vp); 1243 1244 return 0; 1245} 1246 1247int 1248tmpfs_reclaim(struct vop_reclaim_args *v) 1249{ 1250 struct vnode *vp = v->a_vp; 1251 1252 struct tmpfs_mount *tmp; 1253 struct tmpfs_node *node; 1254 1255 node = VP_TO_TMPFS_NODE(vp); 1256 tmp = VFS_TO_TMPFS(vp->v_mount); 1257 1258 if (vp->v_type == VREG) 1259 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1260 else 1261 vnode_destroy_vobject(vp); 1262 vp->v_object = NULL; 1263 cache_purge(vp); 1264 1265 TMPFS_NODE_LOCK(node); 1266 TMPFS_ASSERT_ELOCKED(node); 1267 tmpfs_free_vp(vp); 1268 1269 /* If the node referenced by this vnode was deleted by the user, 1270 * we must free its associated data structures (now that the vnode 1271 * is being reclaimed). */ 1272 if (node->tn_links == 0 && 1273 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1274 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1275 TMPFS_NODE_UNLOCK(node); 1276 tmpfs_free_node(tmp, node); 1277 } else 1278 TMPFS_NODE_UNLOCK(node); 1279 1280 MPASS(vp->v_data == NULL); 1281 return 0; 1282} 1283 1284static int 1285tmpfs_print(struct vop_print_args *v) 1286{ 1287 struct vnode *vp = v->a_vp; 1288 1289 struct tmpfs_node *node; 1290 1291 node = VP_TO_TMPFS_NODE(vp); 1292 1293 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1294 node, node->tn_flags, node->tn_links); 1295 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1296 node->tn_mode, node->tn_uid, node->tn_gid, 1297 (intmax_t)node->tn_size, node->tn_status); 1298 1299 if (vp->v_type == VFIFO) 1300 fifo_printinfo(vp); 1301 1302 printf("\n"); 1303 1304 return 0; 1305} 1306 1307static int 1308tmpfs_pathconf(struct vop_pathconf_args *v) 1309{ 1310 int name = v->a_name; 1311 register_t *retval = v->a_retval; 1312 1313 int error; 1314 1315 error = 0; 1316 1317 switch (name) { 1318 case _PC_LINK_MAX: 1319 *retval = LINK_MAX; 1320 break; 1321 1322 case _PC_NAME_MAX: 1323 *retval = NAME_MAX; 1324 break; 1325 1326 case _PC_PATH_MAX: 1327 *retval = PATH_MAX; 1328 break; 1329 1330 case _PC_PIPE_BUF: 1331 *retval = PIPE_BUF; 1332 break; 1333 1334 case _PC_CHOWN_RESTRICTED: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_NO_TRUNC: 1339 *retval = 1; 1340 break; 1341 1342 case _PC_SYNC_IO: 1343 *retval = 1; 1344 break; 1345 1346 case _PC_FILESIZEBITS: 1347 *retval = 0; /* XXX Don't know which value should I return. */ 1348 break; 1349 1350 default: 1351 error = EINVAL; 1352 } 1353 1354 return error; 1355} 1356 1357static int 1358tmpfs_vptofh(struct vop_vptofh_args *ap) 1359{ 1360 struct tmpfs_fid *tfhp; 1361 struct tmpfs_node *node; 1362 1363 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1364 node = VP_TO_TMPFS_NODE(ap->a_vp); 1365 1366 tfhp->tf_len = sizeof(struct tmpfs_fid); 1367 tfhp->tf_id = node->tn_id; 1368 tfhp->tf_gen = node->tn_gen; 1369 1370 return (0); 1371} 1372 1373static int 1374tmpfs_whiteout(struct vop_whiteout_args *ap) 1375{ 1376 struct vnode *dvp = ap->a_dvp; 1377 struct componentname *cnp = ap->a_cnp; 1378 struct tmpfs_dirent *de; 1379 1380 switch (ap->a_flags) { 1381 case LOOKUP: 1382 return (0); 1383 case CREATE: 1384 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1385 if (de != NULL) 1386 return (de->td_node == NULL ? 0 : EEXIST); 1387 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1388 case DELETE: 1389 tmpfs_dir_whiteout_remove(dvp, cnp); 1390 return (0); 1391 default: 1392 panic("tmpfs_whiteout: unknown op"); 1393 } 1394} 1395 1396/* 1397 * vnode operations vector used for files stored in a tmpfs file system. 1398 */ 1399struct vop_vector tmpfs_vnodeop_entries = { 1400 .vop_default = &default_vnodeops, 1401 .vop_lookup = vfs_cache_lookup, 1402 .vop_cachedlookup = tmpfs_lookup, 1403 .vop_create = tmpfs_create, 1404 .vop_mknod = tmpfs_mknod, 1405 .vop_open = tmpfs_open, 1406 .vop_close = tmpfs_close, 1407 .vop_access = tmpfs_access, 1408 .vop_getattr = tmpfs_getattr, 1409 .vop_setattr = tmpfs_setattr, 1410 .vop_read = tmpfs_read, 1411 .vop_write = tmpfs_write, 1412 .vop_fsync = tmpfs_fsync, 1413 .vop_remove = tmpfs_remove, 1414 .vop_link = tmpfs_link, 1415 .vop_rename = tmpfs_rename, 1416 .vop_mkdir = tmpfs_mkdir, 1417 .vop_rmdir = tmpfs_rmdir, 1418 .vop_symlink = tmpfs_symlink, 1419 .vop_readdir = tmpfs_readdir, 1420 .vop_readlink = tmpfs_readlink, 1421 .vop_inactive = tmpfs_inactive, 1422 .vop_reclaim = tmpfs_reclaim, 1423 .vop_print = tmpfs_print, 1424 .vop_pathconf = tmpfs_pathconf, 1425 .vop_vptofh = tmpfs_vptofh, 1426 .vop_whiteout = tmpfs_whiteout, 1427 .vop_bmap = VOP_EOPNOTSUPP, 1428}; 1429 1430