tmpfs_vnops.c revision 313075
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: stable/11/sys/fs/tmpfs/tmpfs_vnops.c 313075 2017-02-02 01:11:49Z 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/stat.h> 49#include <sys/systm.h> 50#include <sys/sysctl.h> 51#include <sys/unistd.h> 52#include <sys/vnode.h> 53 54#include <vm/vm.h> 55#include <vm/vm_param.h> 56#include <vm/vm_object.h> 57#include <vm/vm_page.h> 58#include <vm/vm_pager.h> 59 60#include <fs/tmpfs/tmpfs_vnops.h> 61#include <fs/tmpfs/tmpfs.h> 62 63SYSCTL_DECL(_vfs_tmpfs); 64 65static volatile int tmpfs_rename_restarts; 66SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 68 "Times rename had to restart due to lock contention"); 69 70static int 71tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 72 struct vnode **rvp) 73{ 74 75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 76} 77 78static int 79tmpfs_lookup(struct vop_cachedlookup_args *v) 80{ 81 struct vnode *dvp = v->a_dvp; 82 struct vnode **vpp = v->a_vpp; 83 struct componentname *cnp = v->a_cnp; 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode, *pnode; 86 struct tmpfs_mount *tm; 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 tm = VFS_TO_TMPFS(dvp->v_mount); 109 pnode = dnode->tn_dir.tn_parent; 110 tmpfs_ref_node(pnode); 111 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 112 pnode, cnp->cn_lkflags, vpp); 113 tmpfs_free_node(tm, pnode); 114 if (error != 0) 115 goto out; 116 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 117 VREF(dvp); 118 *vpp = dvp; 119 error = 0; 120 } else { 121 de = tmpfs_dir_lookup(dnode, NULL, cnp); 122 if (de != NULL && de->td_node == NULL) 123 cnp->cn_flags |= ISWHITEOUT; 124 if (de == NULL || de->td_node == NULL) { 125 /* 126 * The entry was not found in the directory. 127 * This is OK if we are creating or renaming an 128 * entry and are working on the last component of 129 * the path name. 130 */ 131 if ((cnp->cn_flags & ISLASTCN) && 132 (cnp->cn_nameiop == CREATE || \ 133 cnp->cn_nameiop == RENAME || 134 (cnp->cn_nameiop == DELETE && 135 cnp->cn_flags & DOWHITEOUT && 136 cnp->cn_flags & ISWHITEOUT))) { 137 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 138 cnp->cn_thread); 139 if (error != 0) 140 goto out; 141 142 /* 143 * Keep the component name in the buffer for 144 * future uses. 145 */ 146 cnp->cn_flags |= SAVENAME; 147 148 error = EJUSTRETURN; 149 } else 150 error = ENOENT; 151 } else { 152 struct tmpfs_node *tnode; 153 154 /* 155 * The entry was found, so get its associated 156 * tmpfs_node. 157 */ 158 tnode = de->td_node; 159 160 /* 161 * If we are not at the last path component and 162 * found a non-directory or non-link entry (which 163 * may itself be pointing to a directory), raise 164 * an error. 165 */ 166 if ((tnode->tn_type != VDIR && 167 tnode->tn_type != VLNK) && 168 !(cnp->cn_flags & ISLASTCN)) { 169 error = ENOTDIR; 170 goto out; 171 } 172 173 /* 174 * If we are deleting or renaming the entry, keep 175 * track of its tmpfs_dirent so that it can be 176 * easily deleted later. 177 */ 178 if ((cnp->cn_flags & ISLASTCN) && 179 (cnp->cn_nameiop == DELETE || 180 cnp->cn_nameiop == RENAME)) { 181 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 182 cnp->cn_thread); 183 if (error != 0) 184 goto out; 185 186 /* Allocate a new vnode on the matching entry. */ 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp); 189 if (error != 0) 190 goto out; 191 192 if ((dnode->tn_mode & S_ISTXT) && 193 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 194 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 195 cnp->cn_cred, cnp->cn_thread)) { 196 error = EPERM; 197 vput(*vpp); 198 *vpp = NULL; 199 goto out; 200 } 201 cnp->cn_flags |= SAVENAME; 202 } else { 203 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 204 cnp->cn_lkflags, vpp); 205 if (error != 0) 206 goto out; 207 } 208 } 209 } 210 211 /* 212 * Store the result of this lookup in the cache. Avoid this if the 213 * request was for creation, as it does not improve timings on 214 * emprical tests. 215 */ 216 if ((cnp->cn_flags & MAKEENTRY) != 0) 217 cache_enter(dvp, *vpp, cnp); 218 219out: 220 /* 221 * If there were no errors, *vpp cannot be null and it must be 222 * locked. 223 */ 224 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 225 226 return (error); 227} 228 229static int 230tmpfs_create(struct vop_create_args *v) 231{ 232 struct vnode *dvp = v->a_dvp; 233 struct vnode **vpp = v->a_vpp; 234 struct componentname *cnp = v->a_cnp; 235 struct vattr *vap = v->a_vap; 236 int error; 237 238 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 239 240 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 241 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 242 cache_enter(dvp, *vpp, cnp); 243 return (error); 244} 245 246static int 247tmpfs_mknod(struct vop_mknod_args *v) 248{ 249 struct vnode *dvp = v->a_dvp; 250 struct vnode **vpp = v->a_vpp; 251 struct componentname *cnp = v->a_cnp; 252 struct vattr *vap = v->a_vap; 253 254 if (vap->va_type != VBLK && vap->va_type != VCHR && 255 vap->va_type != VFIFO) 256 return EINVAL; 257 258 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 259} 260 261static int 262tmpfs_open(struct vop_open_args *v) 263{ 264 struct vnode *vp = v->a_vp; 265 int mode = v->a_mode; 266 267 int error; 268 struct tmpfs_node *node; 269 270 MPASS(VOP_ISLOCKED(vp)); 271 272 node = VP_TO_TMPFS_NODE(vp); 273 274 /* The file is still active but all its names have been removed 275 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 276 * it is about to die. */ 277 if (node->tn_links < 1) 278 return (ENOENT); 279 280 /* If the file is marked append-only, deny write requests. */ 281 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 282 error = EPERM; 283 else { 284 error = 0; 285 /* For regular files, the call below is nop. */ 286 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 287 OBJ_DEAD) == 0, ("dead object")); 288 vnode_create_vobject(vp, node->tn_size, v->a_td); 289 } 290 291 MPASS(VOP_ISLOCKED(vp)); 292 return error; 293} 294 295static int 296tmpfs_close(struct vop_close_args *v) 297{ 298 struct vnode *vp = v->a_vp; 299 300 /* Update node times. */ 301 tmpfs_update(vp); 302 303 return (0); 304} 305 306int 307tmpfs_access(struct vop_access_args *v) 308{ 309 struct vnode *vp = v->a_vp; 310 accmode_t accmode = v->a_accmode; 311 struct ucred *cred = v->a_cred; 312 313 int error; 314 struct tmpfs_node *node; 315 316 MPASS(VOP_ISLOCKED(vp)); 317 318 node = VP_TO_TMPFS_NODE(vp); 319 320 switch (vp->v_type) { 321 case VDIR: 322 /* FALLTHROUGH */ 323 case VLNK: 324 /* FALLTHROUGH */ 325 case VREG: 326 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 327 error = EROFS; 328 goto out; 329 } 330 break; 331 332 case VBLK: 333 /* FALLTHROUGH */ 334 case VCHR: 335 /* FALLTHROUGH */ 336 case VSOCK: 337 /* FALLTHROUGH */ 338 case VFIFO: 339 break; 340 341 default: 342 error = EINVAL; 343 goto out; 344 } 345 346 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 347 error = EPERM; 348 goto out; 349 } 350 351 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 352 node->tn_gid, accmode, cred, NULL); 353 354out: 355 MPASS(VOP_ISLOCKED(vp)); 356 357 return error; 358} 359 360int 361tmpfs_getattr(struct vop_getattr_args *v) 362{ 363 struct vnode *vp = v->a_vp; 364 struct vattr *vap = v->a_vap; 365 vm_object_t obj; 366 struct tmpfs_node *node; 367 368 node = VP_TO_TMPFS_NODE(vp); 369 370 tmpfs_update(vp); 371 372 vap->va_type = vp->v_type; 373 vap->va_mode = node->tn_mode; 374 vap->va_nlink = node->tn_links; 375 vap->va_uid = node->tn_uid; 376 vap->va_gid = node->tn_gid; 377 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 378 vap->va_fileid = node->tn_id; 379 vap->va_size = node->tn_size; 380 vap->va_blocksize = PAGE_SIZE; 381 vap->va_atime = node->tn_atime; 382 vap->va_mtime = node->tn_mtime; 383 vap->va_ctime = node->tn_ctime; 384 vap->va_birthtime = node->tn_birthtime; 385 vap->va_gen = node->tn_gen; 386 vap->va_flags = node->tn_flags; 387 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 388 node->tn_rdev : NODEV; 389 if (vp->v_type == VREG) { 390 obj = node->tn_reg.tn_aobj; 391 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 392 } else 393 vap->va_bytes = node->tn_size; 394 vap->va_filerev = 0; 395 396 return 0; 397} 398 399int 400tmpfs_setattr(struct vop_setattr_args *v) 401{ 402 struct vnode *vp = v->a_vp; 403 struct vattr *vap = v->a_vap; 404 struct ucred *cred = v->a_cred; 405 struct thread *td = curthread; 406 407 int error; 408 409 MPASS(VOP_ISLOCKED(vp)); 410 411 error = 0; 412 413 /* Abort if any unsettable attribute is given. */ 414 if (vap->va_type != VNON || 415 vap->va_nlink != VNOVAL || 416 vap->va_fsid != VNOVAL || 417 vap->va_fileid != VNOVAL || 418 vap->va_blocksize != VNOVAL || 419 vap->va_gen != VNOVAL || 420 vap->va_rdev != VNOVAL || 421 vap->va_bytes != VNOVAL) 422 error = EINVAL; 423 424 if (error == 0 && (vap->va_flags != VNOVAL)) 425 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 426 427 if (error == 0 && (vap->va_size != VNOVAL)) 428 error = tmpfs_chsize(vp, vap->va_size, cred, td); 429 430 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 431 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 432 433 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 434 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 435 436 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 437 vap->va_atime.tv_nsec != VNOVAL) || 438 (vap->va_mtime.tv_sec != VNOVAL && 439 vap->va_mtime.tv_nsec != VNOVAL) || 440 (vap->va_birthtime.tv_sec != VNOVAL && 441 vap->va_birthtime.tv_nsec != VNOVAL))) 442 error = tmpfs_chtimes(vp, vap, cred, td); 443 444 /* Update the node times. We give preference to the error codes 445 * generated by this function rather than the ones that may arise 446 * from tmpfs_update. */ 447 tmpfs_update(vp); 448 449 MPASS(VOP_ISLOCKED(vp)); 450 451 return error; 452} 453 454static int 455tmpfs_read(struct vop_read_args *v) 456{ 457 struct vnode *vp; 458 struct uio *uio; 459 struct tmpfs_node *node; 460 461 vp = v->a_vp; 462 if (vp->v_type != VREG) 463 return (EISDIR); 464 uio = v->a_uio; 465 if (uio->uio_offset < 0) 466 return (EINVAL); 467 node = VP_TO_TMPFS_NODE(vp); 468 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 469 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 470} 471 472static int 473tmpfs_write(struct vop_write_args *v) 474{ 475 struct vnode *vp; 476 struct uio *uio; 477 struct tmpfs_node *node; 478 off_t oldsize; 479 int error, ioflag; 480 481 vp = v->a_vp; 482 uio = v->a_uio; 483 ioflag = v->a_ioflag; 484 error = 0; 485 node = VP_TO_TMPFS_NODE(vp); 486 oldsize = node->tn_size; 487 488 if (uio->uio_offset < 0 || vp->v_type != VREG) 489 return (EINVAL); 490 if (uio->uio_resid == 0) 491 return (0); 492 if (ioflag & IO_APPEND) 493 uio->uio_offset = node->tn_size; 494 if (uio->uio_offset + uio->uio_resid > 495 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 496 return (EFBIG); 497 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 498 return (EFBIG); 499 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 500 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 501 FALSE); 502 if (error != 0) 503 goto out; 504 } 505 506 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 507 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 508 TMPFS_NODE_CHANGED; 509 if (node->tn_mode & (S_ISUID | S_ISGID)) { 510 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 511 node->tn_mode &= ~(S_ISUID | S_ISGID); 512 } 513 if (error != 0) 514 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 515 516out: 517 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 518 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 519 520 return (error); 521} 522 523static int 524tmpfs_fsync(struct vop_fsync_args *v) 525{ 526 struct vnode *vp = v->a_vp; 527 528 MPASS(VOP_ISLOCKED(vp)); 529 530 tmpfs_check_mtime(vp); 531 tmpfs_update(vp); 532 533 return 0; 534} 535 536static int 537tmpfs_remove(struct vop_remove_args *v) 538{ 539 struct vnode *dvp = v->a_dvp; 540 struct vnode *vp = v->a_vp; 541 542 int error; 543 struct tmpfs_dirent *de; 544 struct tmpfs_mount *tmp; 545 struct tmpfs_node *dnode; 546 struct tmpfs_node *node; 547 548 MPASS(VOP_ISLOCKED(dvp)); 549 MPASS(VOP_ISLOCKED(vp)); 550 551 if (vp->v_type == VDIR) { 552 error = EISDIR; 553 goto out; 554 } 555 556 dnode = VP_TO_TMPFS_DIR(dvp); 557 node = VP_TO_TMPFS_NODE(vp); 558 tmp = VFS_TO_TMPFS(vp->v_mount); 559 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 560 MPASS(de != NULL); 561 562 /* Files marked as immutable or append-only cannot be deleted. */ 563 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 564 (dnode->tn_flags & APPEND)) { 565 error = EPERM; 566 goto out; 567 } 568 569 /* Remove the entry from the directory; as it is a file, we do not 570 * have to change the number of hard links of the directory. */ 571 tmpfs_dir_detach(dvp, de); 572 if (v->a_cnp->cn_flags & DOWHITEOUT) 573 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 574 575 /* Free the directory entry we just deleted. Note that the node 576 * referred by it will not be removed until the vnode is really 577 * reclaimed. */ 578 tmpfs_free_dirent(tmp, de); 579 580 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 581 error = 0; 582 583out: 584 585 return error; 586} 587 588static int 589tmpfs_link(struct vop_link_args *v) 590{ 591 struct vnode *dvp = v->a_tdvp; 592 struct vnode *vp = v->a_vp; 593 struct componentname *cnp = v->a_cnp; 594 595 int error; 596 struct tmpfs_dirent *de; 597 struct tmpfs_node *node; 598 599 MPASS(VOP_ISLOCKED(dvp)); 600 MPASS(cnp->cn_flags & HASBUF); 601 MPASS(dvp != vp); /* XXX When can this be false? */ 602 node = VP_TO_TMPFS_NODE(vp); 603 604 /* Ensure that we do not overflow the maximum number of links imposed 605 * by the system. */ 606 MPASS(node->tn_links <= LINK_MAX); 607 if (node->tn_links == LINK_MAX) { 608 error = EMLINK; 609 goto out; 610 } 611 612 /* We cannot create links of files marked immutable or append-only. */ 613 if (node->tn_flags & (IMMUTABLE | APPEND)) { 614 error = EPERM; 615 goto out; 616 } 617 618 /* Allocate a new directory entry to represent the node. */ 619 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 620 cnp->cn_nameptr, cnp->cn_namelen, &de); 621 if (error != 0) 622 goto out; 623 624 /* Insert the new directory entry into the appropriate directory. */ 625 if (cnp->cn_flags & ISWHITEOUT) 626 tmpfs_dir_whiteout_remove(dvp, cnp); 627 tmpfs_dir_attach(dvp, de); 628 629 /* vp link count has changed, so update node times. */ 630 node->tn_status |= TMPFS_NODE_CHANGED; 631 tmpfs_update(vp); 632 633 error = 0; 634 635out: 636 return error; 637} 638 639/* 640 * We acquire all but fdvp locks using non-blocking acquisitions. If we 641 * fail to acquire any lock in the path we will drop all held locks, 642 * acquire the new lock in a blocking fashion, and then release it and 643 * restart the rename. This acquire/release step ensures that we do not 644 * spin on a lock waiting for release. On error release all vnode locks 645 * and decrement references the way tmpfs_rename() would do. 646 */ 647static int 648tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 649 struct vnode *tdvp, struct vnode **tvpp, 650 struct componentname *fcnp, struct componentname *tcnp) 651{ 652 struct vnode *nvp; 653 struct mount *mp; 654 struct tmpfs_dirent *de; 655 int error, restarts = 0; 656 657 VOP_UNLOCK(tdvp, 0); 658 if (*tvpp != NULL && *tvpp != tdvp) 659 VOP_UNLOCK(*tvpp, 0); 660 mp = fdvp->v_mount; 661 662relock: 663 restarts += 1; 664 error = vn_lock(fdvp, LK_EXCLUSIVE); 665 if (error) 666 goto releout; 667 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 668 VOP_UNLOCK(fdvp, 0); 669 error = vn_lock(tdvp, LK_EXCLUSIVE); 670 if (error) 671 goto releout; 672 VOP_UNLOCK(tdvp, 0); 673 goto relock; 674 } 675 /* 676 * Re-resolve fvp to be certain it still exists and fetch the 677 * correct vnode. 678 */ 679 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 680 if (de == NULL) { 681 VOP_UNLOCK(fdvp, 0); 682 VOP_UNLOCK(tdvp, 0); 683 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 684 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 685 error = EINVAL; 686 else 687 error = ENOENT; 688 goto releout; 689 } 690 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 691 if (error != 0) { 692 VOP_UNLOCK(fdvp, 0); 693 VOP_UNLOCK(tdvp, 0); 694 if (error != EBUSY) 695 goto releout; 696 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 697 if (error != 0) 698 goto releout; 699 VOP_UNLOCK(nvp, 0); 700 /* 701 * Concurrent rename race. 702 */ 703 if (nvp == tdvp) { 704 vrele(nvp); 705 error = EINVAL; 706 goto releout; 707 } 708 vrele(*fvpp); 709 *fvpp = nvp; 710 goto relock; 711 } 712 vrele(*fvpp); 713 *fvpp = nvp; 714 VOP_UNLOCK(*fvpp, 0); 715 /* 716 * Re-resolve tvp and acquire the vnode lock if present. 717 */ 718 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 719 /* 720 * If tvp disappeared we just carry on. 721 */ 722 if (de == NULL && *tvpp != NULL) { 723 vrele(*tvpp); 724 *tvpp = NULL; 725 } 726 /* 727 * Get the tvp ino if the lookup succeeded. We may have to restart 728 * if the non-blocking acquire fails. 729 */ 730 if (de != NULL) { 731 nvp = NULL; 732 error = tmpfs_alloc_vp(mp, de->td_node, 733 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 734 if (*tvpp != NULL) 735 vrele(*tvpp); 736 *tvpp = nvp; 737 if (error != 0) { 738 VOP_UNLOCK(fdvp, 0); 739 VOP_UNLOCK(tdvp, 0); 740 if (error != EBUSY) 741 goto releout; 742 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 743 &nvp); 744 if (error != 0) 745 goto releout; 746 VOP_UNLOCK(nvp, 0); 747 /* 748 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 749 */ 750 if (nvp == fdvp) { 751 error = ENOTEMPTY; 752 goto releout; 753 } 754 goto relock; 755 } 756 } 757 tmpfs_rename_restarts += restarts; 758 759 return (0); 760 761releout: 762 vrele(fdvp); 763 vrele(*fvpp); 764 vrele(tdvp); 765 if (*tvpp != NULL) 766 vrele(*tvpp); 767 tmpfs_rename_restarts += restarts; 768 769 return (error); 770} 771 772static int 773tmpfs_rename(struct vop_rename_args *v) 774{ 775 struct vnode *fdvp = v->a_fdvp; 776 struct vnode *fvp = v->a_fvp; 777 struct componentname *fcnp = v->a_fcnp; 778 struct vnode *tdvp = v->a_tdvp; 779 struct vnode *tvp = v->a_tvp; 780 struct componentname *tcnp = v->a_tcnp; 781 struct mount *mp = NULL; 782 783 char *newname; 784 int error; 785 struct tmpfs_dirent *de; 786 struct tmpfs_mount *tmp; 787 struct tmpfs_node *fdnode; 788 struct tmpfs_node *fnode; 789 struct tmpfs_node *tnode; 790 struct tmpfs_node *tdnode; 791 792 MPASS(VOP_ISLOCKED(tdvp)); 793 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 794 MPASS(fcnp->cn_flags & HASBUF); 795 MPASS(tcnp->cn_flags & HASBUF); 796 797 /* Disallow cross-device renames. 798 * XXX Why isn't this done by the caller? */ 799 if (fvp->v_mount != tdvp->v_mount || 800 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 801 error = EXDEV; 802 goto out; 803 } 804 805 /* If source and target are the same file, there is nothing to do. */ 806 if (fvp == tvp) { 807 error = 0; 808 goto out; 809 } 810 811 /* If we need to move the directory between entries, lock the 812 * source so that we can safely operate on it. */ 813 if (fdvp != tdvp && fdvp != tvp) { 814 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 815 mp = tdvp->v_mount; 816 error = vfs_busy(mp, 0); 817 if (error != 0) { 818 mp = NULL; 819 goto out; 820 } 821 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 822 fcnp, tcnp); 823 if (error != 0) { 824 vfs_unbusy(mp); 825 return (error); 826 } 827 ASSERT_VOP_ELOCKED(fdvp, 828 "tmpfs_rename: fdvp not locked"); 829 ASSERT_VOP_ELOCKED(tdvp, 830 "tmpfs_rename: tdvp not locked"); 831 if (tvp != NULL) 832 ASSERT_VOP_ELOCKED(tvp, 833 "tmpfs_rename: tvp not locked"); 834 if (fvp == tvp) { 835 error = 0; 836 goto out_locked; 837 } 838 } 839 } 840 841 tmp = VFS_TO_TMPFS(tdvp->v_mount); 842 tdnode = VP_TO_TMPFS_DIR(tdvp); 843 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 844 fdnode = VP_TO_TMPFS_DIR(fdvp); 845 fnode = VP_TO_TMPFS_NODE(fvp); 846 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 847 848 /* Entry can disappear before we lock fdvp, 849 * also avoid manipulating '.' and '..' entries. */ 850 if (de == NULL) { 851 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 852 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 853 error = EINVAL; 854 else 855 error = ENOENT; 856 goto out_locked; 857 } 858 MPASS(de->td_node == fnode); 859 860 /* If re-naming a directory to another preexisting directory 861 * ensure that the target directory is empty so that its 862 * removal causes no side effects. 863 * Kern_rename guarantees the destination to be a directory 864 * if the source is one. */ 865 if (tvp != NULL) { 866 MPASS(tnode != NULL); 867 868 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 869 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 870 error = EPERM; 871 goto out_locked; 872 } 873 874 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 875 if (tnode->tn_size > 0) { 876 error = ENOTEMPTY; 877 goto out_locked; 878 } 879 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 880 error = ENOTDIR; 881 goto out_locked; 882 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 883 error = EISDIR; 884 goto out_locked; 885 } else { 886 MPASS(fnode->tn_type != VDIR && 887 tnode->tn_type != VDIR); 888 } 889 } 890 891 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 892 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 893 error = EPERM; 894 goto out_locked; 895 } 896 897 /* Ensure that we have enough memory to hold the new name, if it 898 * has to be changed. */ 899 if (fcnp->cn_namelen != tcnp->cn_namelen || 900 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 901 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 902 } else 903 newname = NULL; 904 905 /* If the node is being moved to another directory, we have to do 906 * the move. */ 907 if (fdnode != tdnode) { 908 /* In case we are moving a directory, we have to adjust its 909 * parent to point to the new parent. */ 910 if (de->td_node->tn_type == VDIR) { 911 struct tmpfs_node *n; 912 913 /* Ensure the target directory is not a child of the 914 * directory being moved. Otherwise, we'd end up 915 * with stale nodes. */ 916 n = tdnode; 917 /* TMPFS_LOCK garanties that no nodes are freed while 918 * traversing the list. Nodes can only be marked as 919 * removed: tn_parent == NULL. */ 920 TMPFS_LOCK(tmp); 921 TMPFS_NODE_LOCK(n); 922 while (n != n->tn_dir.tn_parent) { 923 struct tmpfs_node *parent; 924 925 if (n == fnode) { 926 TMPFS_NODE_UNLOCK(n); 927 TMPFS_UNLOCK(tmp); 928 error = EINVAL; 929 if (newname != NULL) 930 free(newname, M_TMPFSNAME); 931 goto out_locked; 932 } 933 parent = n->tn_dir.tn_parent; 934 TMPFS_NODE_UNLOCK(n); 935 if (parent == NULL) { 936 n = NULL; 937 break; 938 } 939 TMPFS_NODE_LOCK(parent); 940 if (parent->tn_dir.tn_parent == NULL) { 941 TMPFS_NODE_UNLOCK(parent); 942 n = NULL; 943 break; 944 } 945 n = parent; 946 } 947 TMPFS_UNLOCK(tmp); 948 if (n == NULL) { 949 error = EINVAL; 950 if (newname != NULL) 951 free(newname, M_TMPFSNAME); 952 goto out_locked; 953 } 954 TMPFS_NODE_UNLOCK(n); 955 956 /* Adjust the parent pointer. */ 957 TMPFS_VALIDATE_DIR(fnode); 958 TMPFS_NODE_LOCK(de->td_node); 959 de->td_node->tn_dir.tn_parent = tdnode; 960 TMPFS_NODE_UNLOCK(de->td_node); 961 962 /* As a result of changing the target of the '..' 963 * entry, the link count of the source and target 964 * directories has to be adjusted. */ 965 TMPFS_NODE_LOCK(tdnode); 966 TMPFS_ASSERT_LOCKED(tdnode); 967 tdnode->tn_links++; 968 TMPFS_NODE_UNLOCK(tdnode); 969 970 TMPFS_NODE_LOCK(fdnode); 971 TMPFS_ASSERT_LOCKED(fdnode); 972 fdnode->tn_links--; 973 TMPFS_NODE_UNLOCK(fdnode); 974 } 975 } 976 977 /* Do the move: just remove the entry from the source directory 978 * and insert it into the target one. */ 979 tmpfs_dir_detach(fdvp, de); 980 981 if (fcnp->cn_flags & DOWHITEOUT) 982 tmpfs_dir_whiteout_add(fdvp, fcnp); 983 if (tcnp->cn_flags & ISWHITEOUT) 984 tmpfs_dir_whiteout_remove(tdvp, tcnp); 985 986 /* If the name has changed, we need to make it effective by changing 987 * it in the directory entry. */ 988 if (newname != NULL) { 989 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 990 991 free(de->ud.td_name, M_TMPFSNAME); 992 de->ud.td_name = newname; 993 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 994 995 fnode->tn_status |= TMPFS_NODE_CHANGED; 996 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 997 } 998 999 /* If we are overwriting an entry, we have to remove the old one 1000 * from the target directory. */ 1001 if (tvp != NULL) { 1002 struct tmpfs_dirent *tde; 1003 1004 /* Remove the old entry from the target directory. */ 1005 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1006 tmpfs_dir_detach(tdvp, tde); 1007 1008 /* Free the directory entry we just deleted. Note that the 1009 * node referred by it will not be removed until the vnode is 1010 * really reclaimed. */ 1011 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1012 } 1013 1014 tmpfs_dir_attach(tdvp, de); 1015 1016 cache_purge(fvp); 1017 if (tvp != NULL) 1018 cache_purge(tvp); 1019 cache_purge_negative(tdvp); 1020 1021 error = 0; 1022 1023out_locked: 1024 if (fdvp != tdvp && fdvp != tvp) 1025 VOP_UNLOCK(fdvp, 0); 1026 1027out: 1028 /* Release target nodes. */ 1029 /* XXX: I don't understand when tdvp can be the same as tvp, but 1030 * other code takes care of this... */ 1031 if (tdvp == tvp) 1032 vrele(tdvp); 1033 else 1034 vput(tdvp); 1035 if (tvp != NULL) 1036 vput(tvp); 1037 1038 /* Release source nodes. */ 1039 vrele(fdvp); 1040 vrele(fvp); 1041 1042 if (mp != NULL) 1043 vfs_unbusy(mp); 1044 1045 return error; 1046} 1047 1048static int 1049tmpfs_mkdir(struct vop_mkdir_args *v) 1050{ 1051 struct vnode *dvp = v->a_dvp; 1052 struct vnode **vpp = v->a_vpp; 1053 struct componentname *cnp = v->a_cnp; 1054 struct vattr *vap = v->a_vap; 1055 1056 MPASS(vap->va_type == VDIR); 1057 1058 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1059} 1060 1061static int 1062tmpfs_rmdir(struct vop_rmdir_args *v) 1063{ 1064 struct vnode *dvp = v->a_dvp; 1065 struct vnode *vp = v->a_vp; 1066 1067 int error; 1068 struct tmpfs_dirent *de; 1069 struct tmpfs_mount *tmp; 1070 struct tmpfs_node *dnode; 1071 struct tmpfs_node *node; 1072 1073 MPASS(VOP_ISLOCKED(dvp)); 1074 MPASS(VOP_ISLOCKED(vp)); 1075 1076 tmp = VFS_TO_TMPFS(dvp->v_mount); 1077 dnode = VP_TO_TMPFS_DIR(dvp); 1078 node = VP_TO_TMPFS_DIR(vp); 1079 1080 /* Directories with more than two entries ('.' and '..') cannot be 1081 * removed. */ 1082 if (node->tn_size > 0) { 1083 error = ENOTEMPTY; 1084 goto out; 1085 } 1086 1087 if ((dnode->tn_flags & APPEND) 1088 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1089 error = EPERM; 1090 goto out; 1091 } 1092 1093 /* This invariant holds only if we are not trying to remove "..". 1094 * We checked for that above so this is safe now. */ 1095 MPASS(node->tn_dir.tn_parent == dnode); 1096 1097 /* Get the directory entry associated with node (vp). This was 1098 * filled by tmpfs_lookup while looking up the entry. */ 1099 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1100 MPASS(TMPFS_DIRENT_MATCHES(de, 1101 v->a_cnp->cn_nameptr, 1102 v->a_cnp->cn_namelen)); 1103 1104 /* Check flags to see if we are allowed to remove the directory. */ 1105 if ((dnode->tn_flags & APPEND) != 0 || 1106 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1107 error = EPERM; 1108 goto out; 1109 } 1110 1111 1112 /* Detach the directory entry from the directory (dnode). */ 1113 tmpfs_dir_detach(dvp, de); 1114 if (v->a_cnp->cn_flags & DOWHITEOUT) 1115 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1116 1117 /* No vnode should be allocated for this entry from this point */ 1118 TMPFS_NODE_LOCK(node); 1119 node->tn_links--; 1120 node->tn_dir.tn_parent = NULL; 1121 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1122 TMPFS_NODE_MODIFIED; 1123 1124 TMPFS_NODE_UNLOCK(node); 1125 1126 TMPFS_NODE_LOCK(dnode); 1127 dnode->tn_links--; 1128 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1129 TMPFS_NODE_MODIFIED; 1130 TMPFS_NODE_UNLOCK(dnode); 1131 1132 cache_purge(dvp); 1133 cache_purge(vp); 1134 1135 /* Free the directory entry we just deleted. Note that the node 1136 * referred by it will not be removed until the vnode is really 1137 * reclaimed. */ 1138 tmpfs_free_dirent(tmp, de); 1139 1140 /* Release the deleted vnode (will destroy the node, notify 1141 * interested parties and clean it from the cache). */ 1142 1143 dnode->tn_status |= TMPFS_NODE_CHANGED; 1144 tmpfs_update(dvp); 1145 1146 error = 0; 1147 1148out: 1149 return error; 1150} 1151 1152static int 1153tmpfs_symlink(struct vop_symlink_args *v) 1154{ 1155 struct vnode *dvp = v->a_dvp; 1156 struct vnode **vpp = v->a_vpp; 1157 struct componentname *cnp = v->a_cnp; 1158 struct vattr *vap = v->a_vap; 1159 char *target = v->a_target; 1160 1161#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1162 MPASS(vap->va_type == VLNK); 1163#else 1164 vap->va_type = VLNK; 1165#endif 1166 1167 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1168} 1169 1170static int 1171tmpfs_readdir(struct vop_readdir_args *v) 1172{ 1173 struct vnode *vp = v->a_vp; 1174 struct uio *uio = v->a_uio; 1175 int *eofflag = v->a_eofflag; 1176 u_long **cookies = v->a_cookies; 1177 int *ncookies = v->a_ncookies; 1178 1179 int error; 1180 ssize_t startresid; 1181 int maxcookies; 1182 struct tmpfs_node *node; 1183 1184 /* This operation only makes sense on directory nodes. */ 1185 if (vp->v_type != VDIR) 1186 return ENOTDIR; 1187 1188 maxcookies = 0; 1189 node = VP_TO_TMPFS_DIR(vp); 1190 1191 startresid = uio->uio_resid; 1192 1193 /* Allocate cookies for NFS and compat modules. */ 1194 if (cookies != NULL && ncookies != NULL) { 1195 maxcookies = howmany(node->tn_size, 1196 sizeof(struct tmpfs_dirent)) + 2; 1197 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1198 M_WAITOK); 1199 *ncookies = 0; 1200 } 1201 1202 if (cookies == NULL) 1203 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1204 else 1205 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1206 ncookies); 1207 1208 /* Buffer was filled without hitting EOF. */ 1209 if (error == EJUSTRETURN) 1210 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1211 1212 if (error != 0 && cookies != NULL && ncookies != NULL) { 1213 free(*cookies, M_TEMP); 1214 *cookies = NULL; 1215 *ncookies = 0; 1216 } 1217 1218 if (eofflag != NULL) 1219 *eofflag = 1220 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1221 1222 return error; 1223} 1224 1225static int 1226tmpfs_readlink(struct vop_readlink_args *v) 1227{ 1228 struct vnode *vp = v->a_vp; 1229 struct uio *uio = v->a_uio; 1230 1231 int error; 1232 struct tmpfs_node *node; 1233 1234 MPASS(uio->uio_offset == 0); 1235 MPASS(vp->v_type == VLNK); 1236 1237 node = VP_TO_TMPFS_NODE(vp); 1238 1239 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1240 uio); 1241 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1242 1243 return (error); 1244} 1245 1246static int 1247tmpfs_inactive(struct vop_inactive_args *v) 1248{ 1249 struct vnode *vp; 1250 struct tmpfs_node *node; 1251 1252 vp = v->a_vp; 1253 node = VP_TO_TMPFS_NODE(vp); 1254 if (node->tn_links == 0) 1255 vrecycle(vp); 1256 else 1257 tmpfs_check_mtime(vp); 1258 return (0); 1259} 1260 1261int 1262tmpfs_reclaim(struct vop_reclaim_args *v) 1263{ 1264 struct vnode *vp = v->a_vp; 1265 1266 struct tmpfs_mount *tmp; 1267 struct tmpfs_node *node; 1268 1269 node = VP_TO_TMPFS_NODE(vp); 1270 tmp = VFS_TO_TMPFS(vp->v_mount); 1271 1272 if (vp->v_type == VREG) 1273 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1274 else 1275 vnode_destroy_vobject(vp); 1276 vp->v_object = NULL; 1277 cache_purge(vp); 1278 1279 TMPFS_NODE_LOCK(node); 1280 tmpfs_free_vp(vp); 1281 1282 /* If the node referenced by this vnode was deleted by the user, 1283 * we must free its associated data structures (now that the vnode 1284 * is being reclaimed). */ 1285 if (node->tn_links == 0 && 1286 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1287 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1288 TMPFS_NODE_UNLOCK(node); 1289 tmpfs_free_node(tmp, node); 1290 } else 1291 TMPFS_NODE_UNLOCK(node); 1292 1293 MPASS(vp->v_data == NULL); 1294 return 0; 1295} 1296 1297static int 1298tmpfs_print(struct vop_print_args *v) 1299{ 1300 struct vnode *vp = v->a_vp; 1301 1302 struct tmpfs_node *node; 1303 1304 node = VP_TO_TMPFS_NODE(vp); 1305 1306 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1307 node, node->tn_flags, (uintmax_t)node->tn_links); 1308 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1309 node->tn_mode, node->tn_uid, node->tn_gid, 1310 (intmax_t)node->tn_size, node->tn_status); 1311 1312 if (vp->v_type == VFIFO) 1313 fifo_printinfo(vp); 1314 1315 printf("\n"); 1316 1317 return 0; 1318} 1319 1320static int 1321tmpfs_pathconf(struct vop_pathconf_args *v) 1322{ 1323 int name = v->a_name; 1324 register_t *retval = v->a_retval; 1325 1326 int error; 1327 1328 error = 0; 1329 1330 switch (name) { 1331 case _PC_LINK_MAX: 1332 *retval = LINK_MAX; 1333 break; 1334 1335 case _PC_NAME_MAX: 1336 *retval = NAME_MAX; 1337 break; 1338 1339 case _PC_PATH_MAX: 1340 *retval = PATH_MAX; 1341 break; 1342 1343 case _PC_PIPE_BUF: 1344 *retval = PIPE_BUF; 1345 break; 1346 1347 case _PC_CHOWN_RESTRICTED: 1348 *retval = 1; 1349 break; 1350 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 = 0; /* XXX Don't know which value should I return. */ 1361 break; 1362 1363 default: 1364 error = EINVAL; 1365 } 1366 1367 return error; 1368} 1369 1370static int 1371tmpfs_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 1386static int 1387tmpfs_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/* 1410 * Vnode operations vector used for files stored in a tmpfs file system. 1411 */ 1412struct vop_vector tmpfs_vnodeop_entries = { 1413 .vop_default = &default_vnodeops, 1414 .vop_lookup = vfs_cache_lookup, 1415 .vop_cachedlookup = tmpfs_lookup, 1416 .vop_create = tmpfs_create, 1417 .vop_mknod = tmpfs_mknod, 1418 .vop_open = tmpfs_open, 1419 .vop_close = tmpfs_close, 1420 .vop_access = tmpfs_access, 1421 .vop_getattr = tmpfs_getattr, 1422 .vop_setattr = tmpfs_setattr, 1423 .vop_read = tmpfs_read, 1424 .vop_write = tmpfs_write, 1425 .vop_fsync = tmpfs_fsync, 1426 .vop_remove = tmpfs_remove, 1427 .vop_link = tmpfs_link, 1428 .vop_rename = tmpfs_rename, 1429 .vop_mkdir = tmpfs_mkdir, 1430 .vop_rmdir = tmpfs_rmdir, 1431 .vop_symlink = tmpfs_symlink, 1432 .vop_readdir = tmpfs_readdir, 1433 .vop_readlink = tmpfs_readlink, 1434 .vop_inactive = tmpfs_inactive, 1435 .vop_reclaim = tmpfs_reclaim, 1436 .vop_print = tmpfs_print, 1437 .vop_pathconf = tmpfs_pathconf, 1438 .vop_vptofh = tmpfs_vptofh, 1439 .vop_whiteout = tmpfs_whiteout, 1440 .vop_bmap = VOP_EOPNOTSUPP, 1441}; 1442 1443