tmpfs_vnops.c revision 268764
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 268764 2014-07-16 14:04:46Z 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_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 73 struct vnode **rvp) 74{ 75 76 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 77} 78 79static int 80tmpfs_lookup(struct vop_cachedlookup_args *v) 81{ 82 struct vnode *dvp = v->a_dvp; 83 struct vnode **vpp = v->a_vpp; 84 struct componentname *cnp = v->a_cnp; 85 struct tmpfs_dirent *de; 86 struct tmpfs_node *dnode; 87 int error; 88 89 dnode = VP_TO_TMPFS_DIR(dvp); 90 *vpp = NULLVP; 91 92 /* Check accessibility of requested node as a first step. */ 93 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 94 if (error != 0) 95 goto out; 96 97 /* We cannot be requesting the parent directory of the root node. */ 98 MPASS(IMPLIES(dnode->tn_type == VDIR && 99 dnode->tn_dir.tn_parent == dnode, 100 !(cnp->cn_flags & ISDOTDOT))); 101 102 TMPFS_ASSERT_LOCKED(dnode); 103 if (dnode->tn_dir.tn_parent == NULL) { 104 error = ENOENT; 105 goto out; 106 } 107 if (cnp->cn_flags & ISDOTDOT) { 108 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 109 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp); 110 if (error != 0) 111 goto out; 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 node = VP_TO_TMPFS_NODE(vp); 575 576 /* Ensure that we do not overflow the maximum number of links imposed 577 * by the system. */ 578 MPASS(node->tn_links <= LINK_MAX); 579 if (node->tn_links == LINK_MAX) { 580 error = EMLINK; 581 goto out; 582 } 583 584 /* We cannot create links of files marked immutable or append-only. */ 585 if (node->tn_flags & (IMMUTABLE | APPEND)) { 586 error = EPERM; 587 goto out; 588 } 589 590 /* Allocate a new directory entry to represent the node. */ 591 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 592 cnp->cn_nameptr, cnp->cn_namelen, &de); 593 if (error != 0) 594 goto out; 595 596 /* Insert the new directory entry into the appropriate directory. */ 597 if (cnp->cn_flags & ISWHITEOUT) 598 tmpfs_dir_whiteout_remove(dvp, cnp); 599 tmpfs_dir_attach(dvp, de); 600 601 /* vp link count has changed, so update node times. */ 602 node->tn_status |= TMPFS_NODE_CHANGED; 603 tmpfs_update(vp); 604 605 error = 0; 606 607out: 608 return error; 609} 610 611/* 612 * We acquire all but fdvp locks using non-blocking acquisitions. If we 613 * fail to acquire any lock in the path we will drop all held locks, 614 * acquire the new lock in a blocking fashion, and then release it and 615 * restart the rename. This acquire/release step ensures that we do not 616 * spin on a lock waiting for release. On error release all vnode locks 617 * and decrement references the way tmpfs_rename() would do. 618 */ 619static int 620tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 621 struct vnode *tdvp, struct vnode **tvpp, 622 struct componentname *fcnp, struct componentname *tcnp) 623{ 624 struct vnode *nvp; 625 struct mount *mp; 626 struct tmpfs_dirent *de; 627 int error, restarts = 0; 628 629 VOP_UNLOCK(tdvp, 0); 630 if (*tvpp != NULL && *tvpp != tdvp) 631 VOP_UNLOCK(*tvpp, 0); 632 mp = fdvp->v_mount; 633 634relock: 635 restarts += 1; 636 error = vn_lock(fdvp, LK_EXCLUSIVE); 637 if (error) 638 goto releout; 639 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 640 VOP_UNLOCK(fdvp, 0); 641 error = vn_lock(tdvp, LK_EXCLUSIVE); 642 if (error) 643 goto releout; 644 VOP_UNLOCK(tdvp, 0); 645 goto relock; 646 } 647 /* 648 * Re-resolve fvp to be certain it still exists and fetch the 649 * correct vnode. 650 */ 651 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 652 if (de == NULL) { 653 VOP_UNLOCK(fdvp, 0); 654 VOP_UNLOCK(tdvp, 0); 655 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 656 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 657 error = EINVAL; 658 else 659 error = ENOENT; 660 goto releout; 661 } 662 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 663 if (error != 0) { 664 VOP_UNLOCK(fdvp, 0); 665 VOP_UNLOCK(tdvp, 0); 666 if (error != EBUSY) 667 goto releout; 668 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 669 if (error != 0) 670 goto releout; 671 VOP_UNLOCK(nvp, 0); 672 /* 673 * Concurrent rename race. 674 */ 675 if (nvp == tdvp) { 676 vrele(nvp); 677 error = EINVAL; 678 goto releout; 679 } 680 vrele(*fvpp); 681 *fvpp = nvp; 682 goto relock; 683 } 684 vrele(*fvpp); 685 *fvpp = nvp; 686 VOP_UNLOCK(*fvpp, 0); 687 /* 688 * Re-resolve tvp and acquire the vnode lock if present. 689 */ 690 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 691 /* 692 * If tvp disappeared we just carry on. 693 */ 694 if (de == NULL && *tvpp != NULL) { 695 vrele(*tvpp); 696 *tvpp = NULL; 697 } 698 /* 699 * Get the tvp ino if the lookup succeeded. We may have to restart 700 * if the non-blocking acquire fails. 701 */ 702 if (de != NULL) { 703 nvp = NULL; 704 error = tmpfs_alloc_vp(mp, de->td_node, 705 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 706 if (*tvpp != NULL) 707 vrele(*tvpp); 708 *tvpp = nvp; 709 if (error != 0) { 710 VOP_UNLOCK(fdvp, 0); 711 VOP_UNLOCK(tdvp, 0); 712 if (error != EBUSY) 713 goto releout; 714 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 715 &nvp); 716 if (error != 0) 717 goto releout; 718 VOP_UNLOCK(nvp, 0); 719 /* 720 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 721 */ 722 if (nvp == fdvp) { 723 error = ENOTEMPTY; 724 goto releout; 725 } 726 goto relock; 727 } 728 } 729 tmpfs_rename_restarts += restarts; 730 731 return (0); 732 733releout: 734 vrele(fdvp); 735 vrele(*fvpp); 736 vrele(tdvp); 737 if (*tvpp != NULL) 738 vrele(*tvpp); 739 tmpfs_rename_restarts += restarts; 740 741 return (error); 742} 743 744static int 745tmpfs_rename(struct vop_rename_args *v) 746{ 747 struct vnode *fdvp = v->a_fdvp; 748 struct vnode *fvp = v->a_fvp; 749 struct componentname *fcnp = v->a_fcnp; 750 struct vnode *tdvp = v->a_tdvp; 751 struct vnode *tvp = v->a_tvp; 752 struct componentname *tcnp = v->a_tcnp; 753 struct mount *mp = NULL; 754 755 char *newname; 756 int error; 757 struct tmpfs_dirent *de; 758 struct tmpfs_mount *tmp; 759 struct tmpfs_node *fdnode; 760 struct tmpfs_node *fnode; 761 struct tmpfs_node *tnode; 762 struct tmpfs_node *tdnode; 763 764 MPASS(VOP_ISLOCKED(tdvp)); 765 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 766 MPASS(fcnp->cn_flags & HASBUF); 767 MPASS(tcnp->cn_flags & HASBUF); 768 769 /* Disallow cross-device renames. 770 * XXX Why isn't this done by the caller? */ 771 if (fvp->v_mount != tdvp->v_mount || 772 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 773 error = EXDEV; 774 goto out; 775 } 776 777 /* If source and target are the same file, there is nothing to do. */ 778 if (fvp == tvp) { 779 error = 0; 780 goto out; 781 } 782 783 /* If we need to move the directory between entries, lock the 784 * source so that we can safely operate on it. */ 785 if (fdvp != tdvp && fdvp != tvp) { 786 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 787 mp = tdvp->v_mount; 788 error = vfs_busy(mp, 0); 789 if (error != 0) { 790 mp = NULL; 791 goto out; 792 } 793 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 794 fcnp, tcnp); 795 if (error != 0) { 796 vfs_unbusy(mp); 797 return (error); 798 } 799 ASSERT_VOP_ELOCKED(fdvp, 800 "tmpfs_rename: fdvp not locked"); 801 ASSERT_VOP_ELOCKED(tdvp, 802 "tmpfs_rename: tdvp not locked"); 803 if (tvp != NULL) 804 ASSERT_VOP_ELOCKED(tvp, 805 "tmpfs_rename: tvp not locked"); 806 if (fvp == tvp) { 807 error = 0; 808 goto out_locked; 809 } 810 } 811 } 812 813 tmp = VFS_TO_TMPFS(tdvp->v_mount); 814 tdnode = VP_TO_TMPFS_DIR(tdvp); 815 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 816 fdnode = VP_TO_TMPFS_DIR(fdvp); 817 fnode = VP_TO_TMPFS_NODE(fvp); 818 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 819 820 /* Entry can disappear before we lock fdvp, 821 * also avoid manipulating '.' and '..' entries. */ 822 if (de == NULL) { 823 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 824 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 825 error = EINVAL; 826 else 827 error = ENOENT; 828 goto out_locked; 829 } 830 MPASS(de->td_node == fnode); 831 832 /* If re-naming a directory to another preexisting directory 833 * ensure that the target directory is empty so that its 834 * removal causes no side effects. 835 * Kern_rename gurantees the destination to be a directory 836 * if the source is one. */ 837 if (tvp != NULL) { 838 MPASS(tnode != NULL); 839 840 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 841 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 842 error = EPERM; 843 goto out_locked; 844 } 845 846 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 847 if (tnode->tn_size > 0) { 848 error = ENOTEMPTY; 849 goto out_locked; 850 } 851 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 852 error = ENOTDIR; 853 goto out_locked; 854 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 855 error = EISDIR; 856 goto out_locked; 857 } else { 858 MPASS(fnode->tn_type != VDIR && 859 tnode->tn_type != VDIR); 860 } 861 } 862 863 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 864 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 865 error = EPERM; 866 goto out_locked; 867 } 868 869 /* Ensure that we have enough memory to hold the new name, if it 870 * has to be changed. */ 871 if (fcnp->cn_namelen != tcnp->cn_namelen || 872 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 873 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 874 } else 875 newname = NULL; 876 877 /* If the node is being moved to another directory, we have to do 878 * the move. */ 879 if (fdnode != tdnode) { 880 /* In case we are moving a directory, we have to adjust its 881 * parent to point to the new parent. */ 882 if (de->td_node->tn_type == VDIR) { 883 struct tmpfs_node *n; 884 885 /* Ensure the target directory is not a child of the 886 * directory being moved. Otherwise, we'd end up 887 * with stale nodes. */ 888 n = tdnode; 889 /* TMPFS_LOCK garanties that no nodes are freed while 890 * traversing the list. Nodes can only be marked as 891 * removed: tn_parent == NULL. */ 892 TMPFS_LOCK(tmp); 893 TMPFS_NODE_LOCK(n); 894 while (n != n->tn_dir.tn_parent) { 895 struct tmpfs_node *parent; 896 897 if (n == fnode) { 898 TMPFS_NODE_UNLOCK(n); 899 TMPFS_UNLOCK(tmp); 900 error = EINVAL; 901 if (newname != NULL) 902 free(newname, M_TMPFSNAME); 903 goto out_locked; 904 } 905 parent = n->tn_dir.tn_parent; 906 TMPFS_NODE_UNLOCK(n); 907 if (parent == NULL) { 908 n = NULL; 909 break; 910 } 911 TMPFS_NODE_LOCK(parent); 912 if (parent->tn_dir.tn_parent == NULL) { 913 TMPFS_NODE_UNLOCK(parent); 914 n = NULL; 915 break; 916 } 917 n = parent; 918 } 919 TMPFS_UNLOCK(tmp); 920 if (n == NULL) { 921 error = EINVAL; 922 if (newname != NULL) 923 free(newname, M_TMPFSNAME); 924 goto out_locked; 925 } 926 TMPFS_NODE_UNLOCK(n); 927 928 /* Adjust the parent pointer. */ 929 TMPFS_VALIDATE_DIR(fnode); 930 TMPFS_NODE_LOCK(de->td_node); 931 de->td_node->tn_dir.tn_parent = tdnode; 932 TMPFS_NODE_UNLOCK(de->td_node); 933 934 /* As a result of changing the target of the '..' 935 * entry, the link count of the source and target 936 * directories has to be adjusted. */ 937 TMPFS_NODE_LOCK(tdnode); 938 TMPFS_ASSERT_LOCKED(tdnode); 939 tdnode->tn_links++; 940 TMPFS_NODE_UNLOCK(tdnode); 941 942 TMPFS_NODE_LOCK(fdnode); 943 TMPFS_ASSERT_LOCKED(fdnode); 944 fdnode->tn_links--; 945 TMPFS_NODE_UNLOCK(fdnode); 946 } 947 } 948 949 /* Do the move: just remove the entry from the source directory 950 * and insert it into the target one. */ 951 tmpfs_dir_detach(fdvp, de); 952 953 if (fcnp->cn_flags & DOWHITEOUT) 954 tmpfs_dir_whiteout_add(fdvp, fcnp); 955 if (tcnp->cn_flags & ISWHITEOUT) 956 tmpfs_dir_whiteout_remove(tdvp, tcnp); 957 958 /* If the name has changed, we need to make it effective by changing 959 * it in the directory entry. */ 960 if (newname != NULL) { 961 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 962 963 free(de->ud.td_name, M_TMPFSNAME); 964 de->ud.td_name = newname; 965 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 966 967 fnode->tn_status |= TMPFS_NODE_CHANGED; 968 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 969 } 970 971 /* If we are overwriting an entry, we have to remove the old one 972 * from the target directory. */ 973 if (tvp != NULL) { 974 struct tmpfs_dirent *tde; 975 976 /* Remove the old entry from the target directory. */ 977 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 978 tmpfs_dir_detach(tdvp, tde); 979 980 /* Free the directory entry we just deleted. Note that the 981 * node referred by it will not be removed until the vnode is 982 * really reclaimed. */ 983 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 984 } 985 986 tmpfs_dir_attach(tdvp, de); 987 988 cache_purge(fvp); 989 if (tvp != NULL) 990 cache_purge(tvp); 991 cache_purge_negative(tdvp); 992 993 error = 0; 994 995out_locked: 996 if (fdvp != tdvp && fdvp != tvp) 997 VOP_UNLOCK(fdvp, 0); 998 999out: 1000 /* Release target nodes. */ 1001 /* XXX: I don't understand when tdvp can be the same as tvp, but 1002 * other code takes care of this... */ 1003 if (tdvp == tvp) 1004 vrele(tdvp); 1005 else 1006 vput(tdvp); 1007 if (tvp != NULL) 1008 vput(tvp); 1009 1010 /* Release source nodes. */ 1011 vrele(fdvp); 1012 vrele(fvp); 1013 1014 if (mp != NULL) 1015 vfs_unbusy(mp); 1016 1017 return error; 1018} 1019 1020static int 1021tmpfs_mkdir(struct vop_mkdir_args *v) 1022{ 1023 struct vnode *dvp = v->a_dvp; 1024 struct vnode **vpp = v->a_vpp; 1025 struct componentname *cnp = v->a_cnp; 1026 struct vattr *vap = v->a_vap; 1027 1028 MPASS(vap->va_type == VDIR); 1029 1030 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1031} 1032 1033static int 1034tmpfs_rmdir(struct vop_rmdir_args *v) 1035{ 1036 struct vnode *dvp = v->a_dvp; 1037 struct vnode *vp = v->a_vp; 1038 1039 int error; 1040 struct tmpfs_dirent *de; 1041 struct tmpfs_mount *tmp; 1042 struct tmpfs_node *dnode; 1043 struct tmpfs_node *node; 1044 1045 MPASS(VOP_ISLOCKED(dvp)); 1046 MPASS(VOP_ISLOCKED(vp)); 1047 1048 tmp = VFS_TO_TMPFS(dvp->v_mount); 1049 dnode = VP_TO_TMPFS_DIR(dvp); 1050 node = VP_TO_TMPFS_DIR(vp); 1051 1052 /* Directories with more than two entries ('.' and '..') cannot be 1053 * removed. */ 1054 if (node->tn_size > 0) { 1055 error = ENOTEMPTY; 1056 goto out; 1057 } 1058 1059 if ((dnode->tn_flags & APPEND) 1060 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1061 error = EPERM; 1062 goto out; 1063 } 1064 1065 /* This invariant holds only if we are not trying to remove "..". 1066 * We checked for that above so this is safe now. */ 1067 MPASS(node->tn_dir.tn_parent == dnode); 1068 1069 /* Get the directory entry associated with node (vp). This was 1070 * filled by tmpfs_lookup while looking up the entry. */ 1071 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1072 MPASS(TMPFS_DIRENT_MATCHES(de, 1073 v->a_cnp->cn_nameptr, 1074 v->a_cnp->cn_namelen)); 1075 1076 /* Check flags to see if we are allowed to remove the directory. */ 1077 if (dnode->tn_flags & APPEND 1078 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1079 error = EPERM; 1080 goto out; 1081 } 1082 1083 1084 /* Detach the directory entry from the directory (dnode). */ 1085 tmpfs_dir_detach(dvp, de); 1086 if (v->a_cnp->cn_flags & DOWHITEOUT) 1087 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1088 1089 /* No vnode should be allocated for this entry from this point */ 1090 TMPFS_NODE_LOCK(node); 1091 TMPFS_ASSERT_ELOCKED(node); 1092 node->tn_links--; 1093 node->tn_dir.tn_parent = NULL; 1094 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1095 TMPFS_NODE_MODIFIED; 1096 1097 TMPFS_NODE_UNLOCK(node); 1098 1099 TMPFS_NODE_LOCK(dnode); 1100 TMPFS_ASSERT_ELOCKED(dnode); 1101 dnode->tn_links--; 1102 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1103 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1104 TMPFS_NODE_UNLOCK(dnode); 1105 1106 cache_purge(dvp); 1107 cache_purge(vp); 1108 1109 /* Free the directory entry we just deleted. Note that the node 1110 * referred by it will not be removed until the vnode is really 1111 * reclaimed. */ 1112 tmpfs_free_dirent(tmp, de); 1113 1114 /* Release the deleted vnode (will destroy the node, notify 1115 * interested parties and clean it from the cache). */ 1116 1117 dnode->tn_status |= TMPFS_NODE_CHANGED; 1118 tmpfs_update(dvp); 1119 1120 error = 0; 1121 1122out: 1123 return error; 1124} 1125 1126static int 1127tmpfs_symlink(struct vop_symlink_args *v) 1128{ 1129 struct vnode *dvp = v->a_dvp; 1130 struct vnode **vpp = v->a_vpp; 1131 struct componentname *cnp = v->a_cnp; 1132 struct vattr *vap = v->a_vap; 1133 char *target = v->a_target; 1134 1135#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1136 MPASS(vap->va_type == VLNK); 1137#else 1138 vap->va_type = VLNK; 1139#endif 1140 1141 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1142} 1143 1144static int 1145tmpfs_readdir(struct vop_readdir_args *v) 1146{ 1147 struct vnode *vp = v->a_vp; 1148 struct uio *uio = v->a_uio; 1149 int *eofflag = v->a_eofflag; 1150 u_long **cookies = v->a_cookies; 1151 int *ncookies = v->a_ncookies; 1152 1153 int error; 1154 ssize_t startresid; 1155 int maxcookies; 1156 struct tmpfs_node *node; 1157 1158 /* This operation only makes sense on directory nodes. */ 1159 if (vp->v_type != VDIR) 1160 return ENOTDIR; 1161 1162 maxcookies = 0; 1163 node = VP_TO_TMPFS_DIR(vp); 1164 1165 startresid = uio->uio_resid; 1166 1167 /* Allocate cookies for NFS and compat modules. */ 1168 if (cookies != NULL && ncookies != NULL) { 1169 maxcookies = howmany(node->tn_size, 1170 sizeof(struct tmpfs_dirent)) + 2; 1171 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1172 M_WAITOK); 1173 *ncookies = 0; 1174 } 1175 1176 if (cookies == NULL) 1177 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1178 else 1179 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1180 ncookies); 1181 1182 /* Buffer was filled without hitting EOF. */ 1183 if (error == EJUSTRETURN) 1184 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1185 1186 if (error != 0 && cookies != NULL) 1187 free(*cookies, M_TEMP); 1188 1189 if (eofflag != NULL) 1190 *eofflag = 1191 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1192 1193 return error; 1194} 1195 1196static int 1197tmpfs_readlink(struct vop_readlink_args *v) 1198{ 1199 struct vnode *vp = v->a_vp; 1200 struct uio *uio = v->a_uio; 1201 1202 int error; 1203 struct tmpfs_node *node; 1204 1205 MPASS(uio->uio_offset == 0); 1206 MPASS(vp->v_type == VLNK); 1207 1208 node = VP_TO_TMPFS_NODE(vp); 1209 1210 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1211 uio); 1212 node->tn_status |= TMPFS_NODE_ACCESSED; 1213 1214 return error; 1215} 1216 1217static int 1218tmpfs_inactive(struct vop_inactive_args *v) 1219{ 1220 struct vnode *vp = v->a_vp; 1221 1222 struct tmpfs_node *node; 1223 1224 node = VP_TO_TMPFS_NODE(vp); 1225 1226 if (node->tn_links == 0) 1227 vrecycle(vp); 1228 1229 return 0; 1230} 1231 1232int 1233tmpfs_reclaim(struct vop_reclaim_args *v) 1234{ 1235 struct vnode *vp = v->a_vp; 1236 1237 struct tmpfs_mount *tmp; 1238 struct tmpfs_node *node; 1239 1240 node = VP_TO_TMPFS_NODE(vp); 1241 tmp = VFS_TO_TMPFS(vp->v_mount); 1242 1243 if (vp->v_type == VREG) 1244 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1245 else 1246 vnode_destroy_vobject(vp); 1247 vp->v_object = NULL; 1248 cache_purge(vp); 1249 1250 TMPFS_NODE_LOCK(node); 1251 TMPFS_ASSERT_ELOCKED(node); 1252 tmpfs_free_vp(vp); 1253 1254 /* If the node referenced by this vnode was deleted by the user, 1255 * we must free its associated data structures (now that the vnode 1256 * is being reclaimed). */ 1257 if (node->tn_links == 0 && 1258 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1259 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1260 TMPFS_NODE_UNLOCK(node); 1261 tmpfs_free_node(tmp, node); 1262 } else 1263 TMPFS_NODE_UNLOCK(node); 1264 1265 MPASS(vp->v_data == NULL); 1266 return 0; 1267} 1268 1269static int 1270tmpfs_print(struct vop_print_args *v) 1271{ 1272 struct vnode *vp = v->a_vp; 1273 1274 struct tmpfs_node *node; 1275 1276 node = VP_TO_TMPFS_NODE(vp); 1277 1278 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1279 node, node->tn_flags, node->tn_links); 1280 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1281 node->tn_mode, node->tn_uid, node->tn_gid, 1282 (intmax_t)node->tn_size, node->tn_status); 1283 1284 if (vp->v_type == VFIFO) 1285 fifo_printinfo(vp); 1286 1287 printf("\n"); 1288 1289 return 0; 1290} 1291 1292static int 1293tmpfs_pathconf(struct vop_pathconf_args *v) 1294{ 1295 int name = v->a_name; 1296 register_t *retval = v->a_retval; 1297 1298 int error; 1299 1300 error = 0; 1301 1302 switch (name) { 1303 case _PC_LINK_MAX: 1304 *retval = LINK_MAX; 1305 break; 1306 1307 case _PC_NAME_MAX: 1308 *retval = NAME_MAX; 1309 break; 1310 1311 case _PC_PATH_MAX: 1312 *retval = PATH_MAX; 1313 break; 1314 1315 case _PC_PIPE_BUF: 1316 *retval = PIPE_BUF; 1317 break; 1318 1319 case _PC_CHOWN_RESTRICTED: 1320 *retval = 1; 1321 break; 1322 1323 case _PC_NO_TRUNC: 1324 *retval = 1; 1325 break; 1326 1327 case _PC_SYNC_IO: 1328 *retval = 1; 1329 break; 1330 1331 case _PC_FILESIZEBITS: 1332 *retval = 0; /* XXX Don't know which value should I return. */ 1333 break; 1334 1335 default: 1336 error = EINVAL; 1337 } 1338 1339 return error; 1340} 1341 1342static int 1343tmpfs_vptofh(struct vop_vptofh_args *ap) 1344{ 1345 struct tmpfs_fid *tfhp; 1346 struct tmpfs_node *node; 1347 1348 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1349 node = VP_TO_TMPFS_NODE(ap->a_vp); 1350 1351 tfhp->tf_len = sizeof(struct tmpfs_fid); 1352 tfhp->tf_id = node->tn_id; 1353 tfhp->tf_gen = node->tn_gen; 1354 1355 return (0); 1356} 1357 1358static int 1359tmpfs_whiteout(struct vop_whiteout_args *ap) 1360{ 1361 struct vnode *dvp = ap->a_dvp; 1362 struct componentname *cnp = ap->a_cnp; 1363 struct tmpfs_dirent *de; 1364 1365 switch (ap->a_flags) { 1366 case LOOKUP: 1367 return (0); 1368 case CREATE: 1369 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1370 if (de != NULL) 1371 return (de->td_node == NULL ? 0 : EEXIST); 1372 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1373 case DELETE: 1374 tmpfs_dir_whiteout_remove(dvp, cnp); 1375 return (0); 1376 default: 1377 panic("tmpfs_whiteout: unknown op"); 1378 } 1379} 1380 1381/* 1382 * vnode operations vector used for files stored in a tmpfs file system. 1383 */ 1384struct vop_vector tmpfs_vnodeop_entries = { 1385 .vop_default = &default_vnodeops, 1386 .vop_lookup = vfs_cache_lookup, 1387 .vop_cachedlookup = tmpfs_lookup, 1388 .vop_create = tmpfs_create, 1389 .vop_mknod = tmpfs_mknod, 1390 .vop_open = tmpfs_open, 1391 .vop_close = tmpfs_close, 1392 .vop_access = tmpfs_access, 1393 .vop_getattr = tmpfs_getattr, 1394 .vop_setattr = tmpfs_setattr, 1395 .vop_read = tmpfs_read, 1396 .vop_write = tmpfs_write, 1397 .vop_fsync = tmpfs_fsync, 1398 .vop_remove = tmpfs_remove, 1399 .vop_link = tmpfs_link, 1400 .vop_rename = tmpfs_rename, 1401 .vop_mkdir = tmpfs_mkdir, 1402 .vop_rmdir = tmpfs_rmdir, 1403 .vop_symlink = tmpfs_symlink, 1404 .vop_readdir = tmpfs_readdir, 1405 .vop_readlink = tmpfs_readlink, 1406 .vop_inactive = tmpfs_inactive, 1407 .vop_reclaim = tmpfs_reclaim, 1408 .vop_print = tmpfs_print, 1409 .vop_pathconf = tmpfs_pathconf, 1410 .vop_vptofh = tmpfs_vptofh, 1411 .vop_whiteout = tmpfs_whiteout, 1412 .vop_bmap = VOP_EOPNOTSUPP, 1413}; 1414 1415