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/10/sys/fs/tmpfs/tmpfs_vnops.c 313095 2017-02-02 13:39:11Z 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_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 80{ 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode, *pnode; 83 struct tmpfs_mount *tm; 84 int error; 85 86 dnode = VP_TO_TMPFS_DIR(dvp); 87 *vpp = NULLVP; 88 89 /* Check accessibility of requested node as a first step. */ 90 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 91 if (error != 0) 92 goto out; 93 94 /* We cannot be requesting the parent directory of the root node. */ 95 MPASS(IMPLIES(dnode->tn_type == VDIR && 96 dnode->tn_dir.tn_parent == dnode, 97 !(cnp->cn_flags & ISDOTDOT))); 98 99 TMPFS_ASSERT_LOCKED(dnode); 100 if (dnode->tn_dir.tn_parent == NULL) { 101 error = ENOENT; 102 goto out; 103 } 104 if (cnp->cn_flags & ISDOTDOT) { 105 tm = VFS_TO_TMPFS(dvp->v_mount); 106 pnode = dnode->tn_dir.tn_parent; 107 tmpfs_ref_node(pnode); 108 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 109 pnode, cnp->cn_lkflags, vpp); 110 tmpfs_free_node(tm, pnode); 111 if (error != 0) 112 goto out; 113 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 114 VREF(dvp); 115 *vpp = dvp; 116 error = 0; 117 } else { 118 de = tmpfs_dir_lookup(dnode, NULL, cnp); 119 if (de != NULL && de->td_node == NULL) 120 cnp->cn_flags |= ISWHITEOUT; 121 if (de == NULL || de->td_node == NULL) { 122 /* 123 * The entry was not found in the directory. 124 * This is OK if we are creating or renaming an 125 * entry and are working on the last component of 126 * the path name. 127 */ 128 if ((cnp->cn_flags & ISLASTCN) && 129 (cnp->cn_nameiop == CREATE || \ 130 cnp->cn_nameiop == RENAME || 131 (cnp->cn_nameiop == DELETE && 132 cnp->cn_flags & DOWHITEOUT && 133 cnp->cn_flags & ISWHITEOUT))) { 134 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 135 cnp->cn_thread); 136 if (error != 0) 137 goto out; 138 139 /* 140 * Keep the component name in the buffer for 141 * future uses. 142 */ 143 cnp->cn_flags |= SAVENAME; 144 145 error = EJUSTRETURN; 146 } else 147 error = ENOENT; 148 } else { 149 struct tmpfs_node *tnode; 150 151 /* 152 * The entry was found, so get its associated 153 * tmpfs_node. 154 */ 155 tnode = de->td_node; 156 157 /* 158 * If we are not at the last path component and 159 * found a non-directory or non-link entry (which 160 * may itself be pointing to a directory), raise 161 * an error. 162 */ 163 if ((tnode->tn_type != VDIR && 164 tnode->tn_type != VLNK) && 165 !(cnp->cn_flags & ISLASTCN)) { 166 error = ENOTDIR; 167 goto out; 168 } 169 170 /* 171 * If we are deleting or renaming the entry, keep 172 * track of its tmpfs_dirent so that it can be 173 * easily deleted later. 174 */ 175 if ((cnp->cn_flags & ISLASTCN) && 176 (cnp->cn_nameiop == DELETE || 177 cnp->cn_nameiop == RENAME)) { 178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 179 cnp->cn_thread); 180 if (error != 0) 181 goto out; 182 183 /* Allocate a new vnode on the matching entry. */ 184 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 185 cnp->cn_lkflags, vpp); 186 if (error != 0) 187 goto out; 188 189 if ((dnode->tn_mode & S_ISTXT) && 190 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 191 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 192 cnp->cn_cred, cnp->cn_thread)) { 193 error = EPERM; 194 vput(*vpp); 195 *vpp = NULL; 196 goto out; 197 } 198 cnp->cn_flags |= SAVENAME; 199 } else { 200 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 201 cnp->cn_lkflags, vpp); 202 if (error != 0) 203 goto out; 204 } 205 } 206 } 207 208 /* 209 * Store the result of this lookup in the cache. Avoid this if the 210 * request was for creation, as it does not improve timings on 211 * emprical tests. 212 */ 213 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 214 cache_enter(dvp, *vpp, cnp); 215 216out: 217 /* 218 * If there were no errors, *vpp cannot be null and it must be 219 * locked. 220 */ 221 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 222 223 return (error); 224} 225 226static int 227tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 228{ 229 230 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 231} 232 233static int 234tmpfs_lookup(struct vop_lookup_args *v) 235{ 236 237 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 238} 239 240static int 241tmpfs_create(struct vop_create_args *v) 242{ 243 struct vnode *dvp = v->a_dvp; 244 struct vnode **vpp = v->a_vpp; 245 struct componentname *cnp = v->a_cnp; 246 struct vattr *vap = v->a_vap; 247 int error; 248 249 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 250 251 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 252 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 253 cache_enter(dvp, *vpp, cnp); 254 return (error); 255} 256 257static int 258tmpfs_mknod(struct vop_mknod_args *v) 259{ 260 struct vnode *dvp = v->a_dvp; 261 struct vnode **vpp = v->a_vpp; 262 struct componentname *cnp = v->a_cnp; 263 struct vattr *vap = v->a_vap; 264 265 if (vap->va_type != VBLK && vap->va_type != VCHR && 266 vap->va_type != VFIFO) 267 return EINVAL; 268 269 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 270} 271 272static int 273tmpfs_open(struct vop_open_args *v) 274{ 275 struct vnode *vp = v->a_vp; 276 int mode = v->a_mode; 277 278 int error; 279 struct tmpfs_node *node; 280 281 MPASS(VOP_ISLOCKED(vp)); 282 283 node = VP_TO_TMPFS_NODE(vp); 284 285 /* The file is still active but all its names have been removed 286 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 287 * it is about to die. */ 288 if (node->tn_links < 1) 289 return (ENOENT); 290 291 /* If the file is marked append-only, deny write requests. */ 292 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 293 error = EPERM; 294 else { 295 error = 0; 296 /* For regular files, the call below is nop. */ 297 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 298 OBJ_DEAD) == 0, ("dead object")); 299 vnode_create_vobject(vp, node->tn_size, v->a_td); 300 } 301 302 MPASS(VOP_ISLOCKED(vp)); 303 return error; 304} 305 306static int 307tmpfs_close(struct vop_close_args *v) 308{ 309 struct vnode *vp = v->a_vp; 310 311 /* Update node times. */ 312 tmpfs_update(vp); 313 314 return (0); 315} 316 317int 318tmpfs_access(struct vop_access_args *v) 319{ 320 struct vnode *vp = v->a_vp; 321 accmode_t accmode = v->a_accmode; 322 struct ucred *cred = v->a_cred; 323 324 int error; 325 struct tmpfs_node *node; 326 327 MPASS(VOP_ISLOCKED(vp)); 328 329 node = VP_TO_TMPFS_NODE(vp); 330 331 switch (vp->v_type) { 332 case VDIR: 333 /* FALLTHROUGH */ 334 case VLNK: 335 /* FALLTHROUGH */ 336 case VREG: 337 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 338 error = EROFS; 339 goto out; 340 } 341 break; 342 343 case VBLK: 344 /* FALLTHROUGH */ 345 case VCHR: 346 /* FALLTHROUGH */ 347 case VSOCK: 348 /* FALLTHROUGH */ 349 case VFIFO: 350 break; 351 352 default: 353 error = EINVAL; 354 goto out; 355 } 356 357 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 358 error = EPERM; 359 goto out; 360 } 361 362 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 363 node->tn_gid, accmode, cred, NULL); 364 365out: 366 MPASS(VOP_ISLOCKED(vp)); 367 368 return error; 369} 370 371int 372tmpfs_getattr(struct vop_getattr_args *v) 373{ 374 struct vnode *vp = v->a_vp; 375 struct vattr *vap = v->a_vap; 376 377 struct tmpfs_node *node; 378 379 node = VP_TO_TMPFS_NODE(vp); 380 381 tmpfs_update(vp); 382 383 vap->va_type = vp->v_type; 384 vap->va_mode = node->tn_mode; 385 vap->va_nlink = node->tn_links; 386 vap->va_uid = node->tn_uid; 387 vap->va_gid = node->tn_gid; 388 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 389 vap->va_fileid = node->tn_id; 390 vap->va_size = node->tn_size; 391 vap->va_blocksize = PAGE_SIZE; 392 vap->va_atime = node->tn_atime; 393 vap->va_mtime = node->tn_mtime; 394 vap->va_ctime = node->tn_ctime; 395 vap->va_birthtime = node->tn_birthtime; 396 vap->va_gen = node->tn_gen; 397 vap->va_flags = node->tn_flags; 398 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 399 node->tn_rdev : NODEV; 400 vap->va_bytes = round_page(node->tn_size); 401 vap->va_filerev = 0; 402 403 return 0; 404} 405 406int 407tmpfs_setattr(struct vop_setattr_args *v) 408{ 409 struct vnode *vp = v->a_vp; 410 struct vattr *vap = v->a_vap; 411 struct ucred *cred = v->a_cred; 412 struct thread *td = curthread; 413 414 int error; 415 416 MPASS(VOP_ISLOCKED(vp)); 417 418 error = 0; 419 420 /* Abort if any unsettable attribute is given. */ 421 if (vap->va_type != VNON || 422 vap->va_nlink != VNOVAL || 423 vap->va_fsid != VNOVAL || 424 vap->va_fileid != VNOVAL || 425 vap->va_blocksize != VNOVAL || 426 vap->va_gen != VNOVAL || 427 vap->va_rdev != VNOVAL || 428 vap->va_bytes != VNOVAL) 429 error = EINVAL; 430 431 if (error == 0 && (vap->va_flags != VNOVAL)) 432 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 433 434 if (error == 0 && (vap->va_size != VNOVAL)) 435 error = tmpfs_chsize(vp, vap->va_size, cred, td); 436 437 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 438 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 439 440 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 441 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 442 443 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 444 vap->va_atime.tv_nsec != VNOVAL) || 445 (vap->va_mtime.tv_sec != VNOVAL && 446 vap->va_mtime.tv_nsec != VNOVAL) || 447 (vap->va_birthtime.tv_sec != VNOVAL && 448 vap->va_birthtime.tv_nsec != VNOVAL))) 449 error = tmpfs_chtimes(vp, vap, cred, td); 450 451 /* Update the node times. We give preference to the error codes 452 * generated by this function rather than the ones that may arise 453 * from tmpfs_update. */ 454 tmpfs_update(vp); 455 456 MPASS(VOP_ISLOCKED(vp)); 457 458 return error; 459} 460 461static int 462tmpfs_read(struct vop_read_args *v) 463{ 464 struct vnode *vp; 465 struct uio *uio; 466 struct tmpfs_node *node; 467 468 vp = v->a_vp; 469 if (vp->v_type != VREG) 470 return (EISDIR); 471 uio = v->a_uio; 472 if (uio->uio_offset < 0) 473 return (EINVAL); 474 node = VP_TO_TMPFS_NODE(vp); 475 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 476 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 477} 478 479static int 480tmpfs_write(struct vop_write_args *v) 481{ 482 struct vnode *vp; 483 struct uio *uio; 484 struct tmpfs_node *node; 485 off_t oldsize; 486 int error, ioflag; 487 488 vp = v->a_vp; 489 uio = v->a_uio; 490 ioflag = v->a_ioflag; 491 error = 0; 492 node = VP_TO_TMPFS_NODE(vp); 493 oldsize = node->tn_size; 494 495 if (uio->uio_offset < 0 || vp->v_type != VREG) 496 return (EINVAL); 497 if (uio->uio_resid == 0) 498 return (0); 499 if (ioflag & IO_APPEND) 500 uio->uio_offset = node->tn_size; 501 if (uio->uio_offset + uio->uio_resid > 502 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 503 return (EFBIG); 504 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 505 return (EFBIG); 506 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 507 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 508 FALSE); 509 if (error != 0) 510 goto out; 511 } 512 513 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 514 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 515 TMPFS_NODE_CHANGED; 516 if (node->tn_mode & (S_ISUID | S_ISGID)) { 517 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 518 node->tn_mode &= ~(S_ISUID | S_ISGID); 519 } 520 if (error != 0) 521 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 522 523out: 524 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 525 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 526 527 return (error); 528} 529 530static int 531tmpfs_fsync(struct vop_fsync_args *v) 532{ 533 struct vnode *vp = v->a_vp; 534 535 MPASS(VOP_ISLOCKED(vp)); 536 537 tmpfs_check_mtime(vp); 538 tmpfs_update(vp); 539 540 return 0; 541} 542 543static int 544tmpfs_remove(struct vop_remove_args *v) 545{ 546 struct vnode *dvp = v->a_dvp; 547 struct vnode *vp = v->a_vp; 548 549 int error; 550 struct tmpfs_dirent *de; 551 struct tmpfs_mount *tmp; 552 struct tmpfs_node *dnode; 553 struct tmpfs_node *node; 554 555 MPASS(VOP_ISLOCKED(dvp)); 556 MPASS(VOP_ISLOCKED(vp)); 557 558 if (vp->v_type == VDIR) { 559 error = EISDIR; 560 goto out; 561 } 562 563 dnode = VP_TO_TMPFS_DIR(dvp); 564 node = VP_TO_TMPFS_NODE(vp); 565 tmp = VFS_TO_TMPFS(vp->v_mount); 566 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 567 MPASS(de != NULL); 568 569 /* Files marked as immutable or append-only cannot be deleted. */ 570 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 571 (dnode->tn_flags & APPEND)) { 572 error = EPERM; 573 goto out; 574 } 575 576 /* Remove the entry from the directory; as it is a file, we do not 577 * have to change the number of hard links of the directory. */ 578 tmpfs_dir_detach(dvp, de); 579 if (v->a_cnp->cn_flags & DOWHITEOUT) 580 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 581 582 /* Free the directory entry we just deleted. Note that the node 583 * referred by it will not be removed until the vnode is really 584 * reclaimed. */ 585 tmpfs_free_dirent(tmp, de); 586 587 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 588 error = 0; 589 590out: 591 592 return error; 593} 594 595static int 596tmpfs_link(struct vop_link_args *v) 597{ 598 struct vnode *dvp = v->a_tdvp; 599 struct vnode *vp = v->a_vp; 600 struct componentname *cnp = v->a_cnp; 601 602 int error; 603 struct tmpfs_dirent *de; 604 struct tmpfs_node *node; 605 606 MPASS(VOP_ISLOCKED(dvp)); 607 MPASS(cnp->cn_flags & HASBUF); 608 MPASS(dvp != vp); /* XXX When can this be false? */ 609 node = VP_TO_TMPFS_NODE(vp); 610 611 /* Ensure that we do not overflow the maximum number of links imposed 612 * by the system. */ 613 MPASS(node->tn_links <= LINK_MAX); 614 if (node->tn_links == LINK_MAX) { 615 error = EMLINK; 616 goto out; 617 } 618 619 /* We cannot create links of files marked immutable or append-only. */ 620 if (node->tn_flags & (IMMUTABLE | APPEND)) { 621 error = EPERM; 622 goto out; 623 } 624 625 /* Allocate a new directory entry to represent the node. */ 626 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 627 cnp->cn_nameptr, cnp->cn_namelen, &de); 628 if (error != 0) 629 goto out; 630 631 /* Insert the new directory entry into the appropriate directory. */ 632 if (cnp->cn_flags & ISWHITEOUT) 633 tmpfs_dir_whiteout_remove(dvp, cnp); 634 tmpfs_dir_attach(dvp, de); 635 636 /* vp link count has changed, so update node times. */ 637 node->tn_status |= TMPFS_NODE_CHANGED; 638 tmpfs_update(vp); 639 640 error = 0; 641 642out: 643 return error; 644} 645 646/* 647 * We acquire all but fdvp locks using non-blocking acquisitions. If we 648 * fail to acquire any lock in the path we will drop all held locks, 649 * acquire the new lock in a blocking fashion, and then release it and 650 * restart the rename. This acquire/release step ensures that we do not 651 * spin on a lock waiting for release. On error release all vnode locks 652 * and decrement references the way tmpfs_rename() would do. 653 */ 654static int 655tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 656 struct vnode *tdvp, struct vnode **tvpp, 657 struct componentname *fcnp, struct componentname *tcnp) 658{ 659 struct vnode *nvp; 660 struct mount *mp; 661 struct tmpfs_dirent *de; 662 int error, restarts = 0; 663 664 VOP_UNLOCK(tdvp, 0); 665 if (*tvpp != NULL && *tvpp != tdvp) 666 VOP_UNLOCK(*tvpp, 0); 667 mp = fdvp->v_mount; 668 669relock: 670 restarts += 1; 671 error = vn_lock(fdvp, LK_EXCLUSIVE); 672 if (error) 673 goto releout; 674 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 675 VOP_UNLOCK(fdvp, 0); 676 error = vn_lock(tdvp, LK_EXCLUSIVE); 677 if (error) 678 goto releout; 679 VOP_UNLOCK(tdvp, 0); 680 goto relock; 681 } 682 /* 683 * Re-resolve fvp to be certain it still exists and fetch the 684 * correct vnode. 685 */ 686 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 687 if (de == NULL) { 688 VOP_UNLOCK(fdvp, 0); 689 VOP_UNLOCK(tdvp, 0); 690 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 691 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 692 error = EINVAL; 693 else 694 error = ENOENT; 695 goto releout; 696 } 697 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 698 if (error != 0) { 699 VOP_UNLOCK(fdvp, 0); 700 VOP_UNLOCK(tdvp, 0); 701 if (error != EBUSY) 702 goto releout; 703 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 704 if (error != 0) 705 goto releout; 706 VOP_UNLOCK(nvp, 0); 707 /* 708 * Concurrent rename race. 709 */ 710 if (nvp == tdvp) { 711 vrele(nvp); 712 error = EINVAL; 713 goto releout; 714 } 715 vrele(*fvpp); 716 *fvpp = nvp; 717 goto relock; 718 } 719 vrele(*fvpp); 720 *fvpp = nvp; 721 VOP_UNLOCK(*fvpp, 0); 722 /* 723 * Re-resolve tvp and acquire the vnode lock if present. 724 */ 725 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 726 /* 727 * If tvp disappeared we just carry on. 728 */ 729 if (de == NULL && *tvpp != NULL) { 730 vrele(*tvpp); 731 *tvpp = NULL; 732 } 733 /* 734 * Get the tvp ino if the lookup succeeded. We may have to restart 735 * if the non-blocking acquire fails. 736 */ 737 if (de != NULL) { 738 nvp = NULL; 739 error = tmpfs_alloc_vp(mp, de->td_node, 740 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 741 if (*tvpp != NULL) 742 vrele(*tvpp); 743 *tvpp = nvp; 744 if (error != 0) { 745 VOP_UNLOCK(fdvp, 0); 746 VOP_UNLOCK(tdvp, 0); 747 if (error != EBUSY) 748 goto releout; 749 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 750 &nvp); 751 if (error != 0) 752 goto releout; 753 VOP_UNLOCK(nvp, 0); 754 /* 755 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 756 */ 757 if (nvp == fdvp) { 758 error = ENOTEMPTY; 759 goto releout; 760 } 761 goto relock; 762 } 763 } 764 tmpfs_rename_restarts += restarts; 765 766 return (0); 767 768releout: 769 vrele(fdvp); 770 vrele(*fvpp); 771 vrele(tdvp); 772 if (*tvpp != NULL) 773 vrele(*tvpp); 774 tmpfs_rename_restarts += restarts; 775 776 return (error); 777} 778 779static int 780tmpfs_rename(struct vop_rename_args *v) 781{ 782 struct vnode *fdvp = v->a_fdvp; 783 struct vnode *fvp = v->a_fvp; 784 struct componentname *fcnp = v->a_fcnp; 785 struct vnode *tdvp = v->a_tdvp; 786 struct vnode *tvp = v->a_tvp; 787 struct componentname *tcnp = v->a_tcnp; 788 struct mount *mp = NULL; 789 790 char *newname; 791 int error; 792 struct tmpfs_dirent *de; 793 struct tmpfs_mount *tmp; 794 struct tmpfs_node *fdnode; 795 struct tmpfs_node *fnode; 796 struct tmpfs_node *tnode; 797 struct tmpfs_node *tdnode; 798 799 MPASS(VOP_ISLOCKED(tdvp)); 800 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 801 MPASS(fcnp->cn_flags & HASBUF); 802 MPASS(tcnp->cn_flags & HASBUF); 803 804 /* Disallow cross-device renames. 805 * XXX Why isn't this done by the caller? */ 806 if (fvp->v_mount != tdvp->v_mount || 807 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 808 error = EXDEV; 809 goto out; 810 } 811 812 /* If source and target are the same file, there is nothing to do. */ 813 if (fvp == tvp) { 814 error = 0; 815 goto out; 816 } 817 818 /* If we need to move the directory between entries, lock the 819 * source so that we can safely operate on it. */ 820 if (fdvp != tdvp && fdvp != tvp) { 821 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 822 mp = tdvp->v_mount; 823 error = vfs_busy(mp, 0); 824 if (error != 0) { 825 mp = NULL; 826 goto out; 827 } 828 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 829 fcnp, tcnp); 830 if (error != 0) { 831 vfs_unbusy(mp); 832 return (error); 833 } 834 ASSERT_VOP_ELOCKED(fdvp, 835 "tmpfs_rename: fdvp not locked"); 836 ASSERT_VOP_ELOCKED(tdvp, 837 "tmpfs_rename: tdvp not locked"); 838 if (tvp != NULL) 839 ASSERT_VOP_ELOCKED(tvp, 840 "tmpfs_rename: tvp not locked"); 841 if (fvp == tvp) { 842 error = 0; 843 goto out_locked; 844 } 845 } 846 } 847 848 tmp = VFS_TO_TMPFS(tdvp->v_mount); 849 tdnode = VP_TO_TMPFS_DIR(tdvp); 850 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 851 fdnode = VP_TO_TMPFS_DIR(fdvp); 852 fnode = VP_TO_TMPFS_NODE(fvp); 853 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 854 855 /* Entry can disappear before we lock fdvp, 856 * also avoid manipulating '.' and '..' entries. */ 857 if (de == NULL) { 858 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 859 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 860 error = EINVAL; 861 else 862 error = ENOENT; 863 goto out_locked; 864 } 865 MPASS(de->td_node == fnode); 866 867 /* If re-naming a directory to another preexisting directory 868 * ensure that the target directory is empty so that its 869 * removal causes no side effects. 870 * Kern_rename gurantees the destination to be a directory 871 * if the source is one. */ 872 if (tvp != NULL) { 873 MPASS(tnode != NULL); 874 875 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 876 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 877 error = EPERM; 878 goto out_locked; 879 } 880 881 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 882 if (tnode->tn_size > 0) { 883 error = ENOTEMPTY; 884 goto out_locked; 885 } 886 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 887 error = ENOTDIR; 888 goto out_locked; 889 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 890 error = EISDIR; 891 goto out_locked; 892 } else { 893 MPASS(fnode->tn_type != VDIR && 894 tnode->tn_type != VDIR); 895 } 896 } 897 898 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 899 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 900 error = EPERM; 901 goto out_locked; 902 } 903 904 /* Ensure that we have enough memory to hold the new name, if it 905 * has to be changed. */ 906 if (fcnp->cn_namelen != tcnp->cn_namelen || 907 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 908 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 909 } else 910 newname = NULL; 911 912 /* If the node is being moved to another directory, we have to do 913 * the move. */ 914 if (fdnode != tdnode) { 915 /* In case we are moving a directory, we have to adjust its 916 * parent to point to the new parent. */ 917 if (de->td_node->tn_type == VDIR) { 918 struct tmpfs_node *n; 919 920 /* Ensure the target directory is not a child of the 921 * directory being moved. Otherwise, we'd end up 922 * with stale nodes. */ 923 n = tdnode; 924 /* TMPFS_LOCK garanties that no nodes are freed while 925 * traversing the list. Nodes can only be marked as 926 * removed: tn_parent == NULL. */ 927 TMPFS_LOCK(tmp); 928 TMPFS_NODE_LOCK(n); 929 while (n != n->tn_dir.tn_parent) { 930 struct tmpfs_node *parent; 931 932 if (n == fnode) { 933 TMPFS_NODE_UNLOCK(n); 934 TMPFS_UNLOCK(tmp); 935 error = EINVAL; 936 if (newname != NULL) 937 free(newname, M_TMPFSNAME); 938 goto out_locked; 939 } 940 parent = n->tn_dir.tn_parent; 941 TMPFS_NODE_UNLOCK(n); 942 if (parent == NULL) { 943 n = NULL; 944 break; 945 } 946 TMPFS_NODE_LOCK(parent); 947 if (parent->tn_dir.tn_parent == NULL) { 948 TMPFS_NODE_UNLOCK(parent); 949 n = NULL; 950 break; 951 } 952 n = parent; 953 } 954 TMPFS_UNLOCK(tmp); 955 if (n == NULL) { 956 error = EINVAL; 957 if (newname != NULL) 958 free(newname, M_TMPFSNAME); 959 goto out_locked; 960 } 961 TMPFS_NODE_UNLOCK(n); 962 963 /* Adjust the parent pointer. */ 964 TMPFS_VALIDATE_DIR(fnode); 965 TMPFS_NODE_LOCK(de->td_node); 966 de->td_node->tn_dir.tn_parent = tdnode; 967 TMPFS_NODE_UNLOCK(de->td_node); 968 969 /* As a result of changing the target of the '..' 970 * entry, the link count of the source and target 971 * directories has to be adjusted. */ 972 TMPFS_NODE_LOCK(tdnode); 973 TMPFS_ASSERT_LOCKED(tdnode); 974 tdnode->tn_links++; 975 TMPFS_NODE_UNLOCK(tdnode); 976 977 TMPFS_NODE_LOCK(fdnode); 978 TMPFS_ASSERT_LOCKED(fdnode); 979 fdnode->tn_links--; 980 TMPFS_NODE_UNLOCK(fdnode); 981 } 982 } 983 984 /* Do the move: just remove the entry from the source directory 985 * and insert it into the target one. */ 986 tmpfs_dir_detach(fdvp, de); 987 988 if (fcnp->cn_flags & DOWHITEOUT) 989 tmpfs_dir_whiteout_add(fdvp, fcnp); 990 if (tcnp->cn_flags & ISWHITEOUT) 991 tmpfs_dir_whiteout_remove(tdvp, tcnp); 992 993 /* If the name has changed, we need to make it effective by changing 994 * it in the directory entry. */ 995 if (newname != NULL) { 996 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 997 998 free(de->ud.td_name, M_TMPFSNAME); 999 de->ud.td_name = newname; 1000 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1001 1002 fnode->tn_status |= TMPFS_NODE_CHANGED; 1003 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1004 } 1005 1006 /* If we are overwriting an entry, we have to remove the old one 1007 * from the target directory. */ 1008 if (tvp != NULL) { 1009 struct tmpfs_dirent *tde; 1010 1011 /* Remove the old entry from the target directory. */ 1012 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1013 tmpfs_dir_detach(tdvp, tde); 1014 1015 /* Free the directory entry we just deleted. Note that the 1016 * node referred by it will not be removed until the vnode is 1017 * really reclaimed. */ 1018 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1019 } 1020 1021 tmpfs_dir_attach(tdvp, de); 1022 1023 if (tmpfs_use_nc(fvp)) { 1024 cache_purge(fvp); 1025 if (tvp != NULL) 1026 cache_purge(tvp); 1027 cache_purge_negative(tdvp); 1028 } 1029 1030 error = 0; 1031 1032out_locked: 1033 if (fdvp != tdvp && fdvp != tvp) 1034 VOP_UNLOCK(fdvp, 0); 1035 1036out: 1037 /* Release target nodes. */ 1038 /* XXX: I don't understand when tdvp can be the same as tvp, but 1039 * other code takes care of this... */ 1040 if (tdvp == tvp) 1041 vrele(tdvp); 1042 else 1043 vput(tdvp); 1044 if (tvp != NULL) 1045 vput(tvp); 1046 1047 /* Release source nodes. */ 1048 vrele(fdvp); 1049 vrele(fvp); 1050 1051 if (mp != NULL) 1052 vfs_unbusy(mp); 1053 1054 return error; 1055} 1056 1057static int 1058tmpfs_mkdir(struct vop_mkdir_args *v) 1059{ 1060 struct vnode *dvp = v->a_dvp; 1061 struct vnode **vpp = v->a_vpp; 1062 struct componentname *cnp = v->a_cnp; 1063 struct vattr *vap = v->a_vap; 1064 1065 MPASS(vap->va_type == VDIR); 1066 1067 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1068} 1069 1070static int 1071tmpfs_rmdir(struct vop_rmdir_args *v) 1072{ 1073 struct vnode *dvp = v->a_dvp; 1074 struct vnode *vp = v->a_vp; 1075 1076 int error; 1077 struct tmpfs_dirent *de; 1078 struct tmpfs_mount *tmp; 1079 struct tmpfs_node *dnode; 1080 struct tmpfs_node *node; 1081 1082 MPASS(VOP_ISLOCKED(dvp)); 1083 MPASS(VOP_ISLOCKED(vp)); 1084 1085 tmp = VFS_TO_TMPFS(dvp->v_mount); 1086 dnode = VP_TO_TMPFS_DIR(dvp); 1087 node = VP_TO_TMPFS_DIR(vp); 1088 1089 /* Directories with more than two entries ('.' and '..') cannot be 1090 * removed. */ 1091 if (node->tn_size > 0) { 1092 error = ENOTEMPTY; 1093 goto out; 1094 } 1095 1096 if ((dnode->tn_flags & APPEND) 1097 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1098 error = EPERM; 1099 goto out; 1100 } 1101 1102 /* This invariant holds only if we are not trying to remove "..". 1103 * We checked for that above so this is safe now. */ 1104 MPASS(node->tn_dir.tn_parent == dnode); 1105 1106 /* Get the directory entry associated with node (vp). This was 1107 * filled by tmpfs_lookup while looking up the entry. */ 1108 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1109 MPASS(TMPFS_DIRENT_MATCHES(de, 1110 v->a_cnp->cn_nameptr, 1111 v->a_cnp->cn_namelen)); 1112 1113 /* Check flags to see if we are allowed to remove the directory. */ 1114 if ((dnode->tn_flags & APPEND) != 0 || 1115 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1116 error = EPERM; 1117 goto out; 1118 } 1119 1120 1121 /* Detach the directory entry from the directory (dnode). */ 1122 tmpfs_dir_detach(dvp, de); 1123 if (v->a_cnp->cn_flags & DOWHITEOUT) 1124 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1125 1126 /* No vnode should be allocated for this entry from this point */ 1127 TMPFS_NODE_LOCK(node); 1128 node->tn_links--; 1129 node->tn_dir.tn_parent = NULL; 1130 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1131 TMPFS_NODE_MODIFIED; 1132 1133 TMPFS_NODE_UNLOCK(node); 1134 1135 TMPFS_NODE_LOCK(dnode); 1136 dnode->tn_links--; 1137 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1138 TMPFS_NODE_MODIFIED; 1139 TMPFS_NODE_UNLOCK(dnode); 1140 1141 if (tmpfs_use_nc(dvp)) { 1142 cache_purge(dvp); 1143 cache_purge(vp); 1144 } 1145 1146 /* Free the directory entry we just deleted. Note that the node 1147 * referred by it will not be removed until the vnode is really 1148 * reclaimed. */ 1149 tmpfs_free_dirent(tmp, de); 1150 1151 /* Release the deleted vnode (will destroy the node, notify 1152 * interested parties and clean it from the cache). */ 1153 1154 dnode->tn_status |= TMPFS_NODE_CHANGED; 1155 tmpfs_update(dvp); 1156 1157 error = 0; 1158 1159out: 1160 return error; 1161} 1162 1163static int 1164tmpfs_symlink(struct vop_symlink_args *v) 1165{ 1166 struct vnode *dvp = v->a_dvp; 1167 struct vnode **vpp = v->a_vpp; 1168 struct componentname *cnp = v->a_cnp; 1169 struct vattr *vap = v->a_vap; 1170 char *target = v->a_target; 1171 1172#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1173 MPASS(vap->va_type == VLNK); 1174#else 1175 vap->va_type = VLNK; 1176#endif 1177 1178 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1179} 1180 1181static int 1182tmpfs_readdir(struct vop_readdir_args *v) 1183{ 1184 struct vnode *vp = v->a_vp; 1185 struct uio *uio = v->a_uio; 1186 int *eofflag = v->a_eofflag; 1187 u_long **cookies = v->a_cookies; 1188 int *ncookies = v->a_ncookies; 1189 1190 int error; 1191 ssize_t startresid; 1192 int maxcookies; 1193 struct tmpfs_node *node; 1194 1195 /* This operation only makes sense on directory nodes. */ 1196 if (vp->v_type != VDIR) 1197 return ENOTDIR; 1198 1199 maxcookies = 0; 1200 node = VP_TO_TMPFS_DIR(vp); 1201 1202 startresid = uio->uio_resid; 1203 1204 /* Allocate cookies for NFS and compat modules. */ 1205 if (cookies != NULL && ncookies != NULL) { 1206 maxcookies = howmany(node->tn_size, 1207 sizeof(struct tmpfs_dirent)) + 2; 1208 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1209 M_WAITOK); 1210 *ncookies = 0; 1211 } 1212 1213 if (cookies == NULL) 1214 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1215 else 1216 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1217 ncookies); 1218 1219 /* Buffer was filled without hitting EOF. */ 1220 if (error == EJUSTRETURN) 1221 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1222 1223 if (error != 0 && cookies != NULL && ncookies != NULL) { 1224 free(*cookies, M_TEMP); 1225 *cookies = NULL; 1226 *ncookies = 0; 1227 } 1228 1229 if (eofflag != NULL) 1230 *eofflag = 1231 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1232 1233 return error; 1234} 1235 1236static int 1237tmpfs_readlink(struct vop_readlink_args *v) 1238{ 1239 struct vnode *vp = v->a_vp; 1240 struct uio *uio = v->a_uio; 1241 1242 int error; 1243 struct tmpfs_node *node; 1244 1245 MPASS(uio->uio_offset == 0); 1246 MPASS(vp->v_type == VLNK); 1247 1248 node = VP_TO_TMPFS_NODE(vp); 1249 1250 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1251 uio); 1252 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1253 1254 return (error); 1255} 1256 1257static int 1258tmpfs_inactive(struct vop_inactive_args *v) 1259{ 1260 struct vnode *vp; 1261 struct tmpfs_node *node; 1262 1263 vp = v->a_vp; 1264 node = VP_TO_TMPFS_NODE(vp); 1265 if (node->tn_links == 0) 1266 vrecycle(vp); 1267 else 1268 tmpfs_check_mtime(vp); 1269 return (0); 1270} 1271 1272int 1273tmpfs_reclaim(struct vop_reclaim_args *v) 1274{ 1275 struct vnode *vp = v->a_vp; 1276 1277 struct tmpfs_mount *tmp; 1278 struct tmpfs_node *node; 1279 1280 node = VP_TO_TMPFS_NODE(vp); 1281 tmp = VFS_TO_TMPFS(vp->v_mount); 1282 1283 if (vp->v_type == VREG) 1284 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1285 else 1286 vnode_destroy_vobject(vp); 1287 vp->v_object = NULL; 1288 if (tmpfs_use_nc(vp)) 1289 cache_purge(vp); 1290 1291 TMPFS_NODE_LOCK(node); 1292 tmpfs_free_vp(vp); 1293 1294 /* If the node referenced by this vnode was deleted by the user, 1295 * we must free its associated data structures (now that the vnode 1296 * is being reclaimed). */ 1297 if (node->tn_links == 0 && 1298 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1299 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1300 TMPFS_NODE_UNLOCK(node); 1301 tmpfs_free_node(tmp, node); 1302 } else 1303 TMPFS_NODE_UNLOCK(node); 1304 1305 MPASS(vp->v_data == NULL); 1306 return 0; 1307} 1308 1309static int 1310tmpfs_print(struct vop_print_args *v) 1311{ 1312 struct vnode *vp = v->a_vp; 1313 1314 struct tmpfs_node *node; 1315 1316 node = VP_TO_TMPFS_NODE(vp); 1317 1318 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1319 node, node->tn_flags, node->tn_links); 1320 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1321 node->tn_mode, node->tn_uid, node->tn_gid, 1322 (intmax_t)node->tn_size, node->tn_status); 1323 1324 if (vp->v_type == VFIFO) 1325 fifo_printinfo(vp); 1326 1327 printf("\n"); 1328 1329 return 0; 1330} 1331 1332static int 1333tmpfs_pathconf(struct vop_pathconf_args *v) 1334{ 1335 int name = v->a_name; 1336 register_t *retval = v->a_retval; 1337 1338 int error; 1339 1340 error = 0; 1341 1342 switch (name) { 1343 case _PC_LINK_MAX: 1344 *retval = LINK_MAX; 1345 break; 1346 1347 case _PC_NAME_MAX: 1348 *retval = NAME_MAX; 1349 break; 1350 1351 case _PC_PATH_MAX: 1352 *retval = PATH_MAX; 1353 break; 1354 1355 case _PC_PIPE_BUF: 1356 *retval = PIPE_BUF; 1357 break; 1358 1359 case _PC_CHOWN_RESTRICTED: 1360 *retval = 1; 1361 break; 1362 1363 case _PC_NO_TRUNC: 1364 *retval = 1; 1365 break; 1366 1367 case _PC_SYNC_IO: 1368 *retval = 1; 1369 break; 1370 1371 case _PC_FILESIZEBITS: 1372 *retval = 0; /* XXX Don't know which value should I return. */ 1373 break; 1374 1375 default: 1376 error = EINVAL; 1377 } 1378 1379 return error; 1380} 1381 1382static int 1383tmpfs_vptofh(struct vop_vptofh_args *ap) 1384{ 1385 struct tmpfs_fid *tfhp; 1386 struct tmpfs_node *node; 1387 1388 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1389 node = VP_TO_TMPFS_NODE(ap->a_vp); 1390 1391 tfhp->tf_len = sizeof(struct tmpfs_fid); 1392 tfhp->tf_id = node->tn_id; 1393 tfhp->tf_gen = node->tn_gen; 1394 1395 return (0); 1396} 1397 1398static int 1399tmpfs_whiteout(struct vop_whiteout_args *ap) 1400{ 1401 struct vnode *dvp = ap->a_dvp; 1402 struct componentname *cnp = ap->a_cnp; 1403 struct tmpfs_dirent *de; 1404 1405 switch (ap->a_flags) { 1406 case LOOKUP: 1407 return (0); 1408 case CREATE: 1409 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1410 if (de != NULL) 1411 return (de->td_node == NULL ? 0 : EEXIST); 1412 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1413 case DELETE: 1414 tmpfs_dir_whiteout_remove(dvp, cnp); 1415 return (0); 1416 default: 1417 panic("tmpfs_whiteout: unknown op"); 1418 } 1419} 1420 1421static int 1422tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1423 struct tmpfs_dirent **pde) 1424{ 1425 struct tmpfs_dir_cursor dc; 1426 struct tmpfs_dirent *de; 1427 1428 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1429 de = tmpfs_dir_next(tnp, &dc)) { 1430 if (de->td_node == tn) { 1431 *pde = de; 1432 return (0); 1433 } 1434 } 1435 return (ENOENT); 1436} 1437 1438static int 1439tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1440 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1441{ 1442 struct tmpfs_dirent *de; 1443 int error, i; 1444 1445 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1446 dvp); 1447 if (error != 0) 1448 return (error); 1449 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1450 if (error == 0) { 1451 i = *buflen; 1452 i -= de->td_namelen; 1453 if (i < 0) { 1454 error = ENOMEM; 1455 } else { 1456 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1457 *buflen = i; 1458 } 1459 } 1460 if (error == 0) { 1461 if (vp != *dvp) 1462 VOP_UNLOCK(*dvp, 0); 1463 } else { 1464 if (vp != *dvp) 1465 vput(*dvp); 1466 else 1467 vrele(vp); 1468 } 1469 return (error); 1470} 1471 1472static int 1473tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1474{ 1475 struct vnode *vp, **dvp; 1476 struct tmpfs_node *tn, *tnp, *tnp1; 1477 struct tmpfs_dirent *de; 1478 struct tmpfs_mount *tm; 1479 char *buf; 1480 int *buflen; 1481 int error; 1482 1483 vp = ap->a_vp; 1484 dvp = ap->a_vpp; 1485 buf = ap->a_buf; 1486 buflen = ap->a_buflen; 1487 1488 tm = VFS_TO_TMPFS(vp->v_mount); 1489 tn = VP_TO_TMPFS_NODE(vp); 1490 if (tn->tn_type == VDIR) { 1491 tnp = tn->tn_dir.tn_parent; 1492 if (tnp == NULL) 1493 return (ENOENT); 1494 tmpfs_ref_node(tnp); 1495 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1496 buflen, dvp); 1497 tmpfs_free_node(tm, tnp); 1498 return (error); 1499 } 1500restart: 1501 TMPFS_LOCK(tm); 1502 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1503 if (tnp->tn_type != VDIR) 1504 continue; 1505 TMPFS_NODE_LOCK(tnp); 1506 tmpfs_ref_node_locked(tnp); 1507 1508 /* 1509 * tn_vnode cannot be instantiated while we hold the 1510 * node lock, so the directory cannot be changed while 1511 * we iterate over it. Do this to avoid instantiating 1512 * vnode for directories which cannot point to our 1513 * node. 1514 */ 1515 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1516 &de) : 0; 1517 1518 if (error == 0) { 1519 TMPFS_NODE_UNLOCK(tnp); 1520 TMPFS_UNLOCK(tm); 1521 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1522 dvp); 1523 if (error == 0) { 1524 tmpfs_free_node(tm, tnp); 1525 return (0); 1526 } 1527 if ((vp->v_iflag & VI_DOOMED) != 0) { 1528 tmpfs_free_node(tm, tnp); 1529 return (ENOENT); 1530 } 1531 TMPFS_LOCK(tm); 1532 TMPFS_NODE_LOCK(tnp); 1533 } 1534 if (tmpfs_free_node_locked(tm, tnp, false)) { 1535 goto restart; 1536 } else { 1537 KASSERT(tnp->tn_refcount > 0, 1538 ("node %p refcount zero", tnp)); 1539 tnp1 = LIST_NEXT(tnp, tn_entries); 1540 TMPFS_NODE_UNLOCK(tnp); 1541 } 1542 } 1543 TMPFS_UNLOCK(tm); 1544 return (ENOENT); 1545} 1546 1547/* 1548 * Vnode operations vector used for files stored in a tmpfs file system. 1549 */ 1550struct vop_vector tmpfs_vnodeop_entries = { 1551 .vop_default = &default_vnodeops, 1552 .vop_lookup = vfs_cache_lookup, 1553 .vop_cachedlookup = tmpfs_cached_lookup, 1554 .vop_create = tmpfs_create, 1555 .vop_mknod = tmpfs_mknod, 1556 .vop_open = tmpfs_open, 1557 .vop_close = tmpfs_close, 1558 .vop_access = tmpfs_access, 1559 .vop_getattr = tmpfs_getattr, 1560 .vop_setattr = tmpfs_setattr, 1561 .vop_read = tmpfs_read, 1562 .vop_write = tmpfs_write, 1563 .vop_fsync = tmpfs_fsync, 1564 .vop_remove = tmpfs_remove, 1565 .vop_link = tmpfs_link, 1566 .vop_rename = tmpfs_rename, 1567 .vop_mkdir = tmpfs_mkdir, 1568 .vop_rmdir = tmpfs_rmdir, 1569 .vop_symlink = tmpfs_symlink, 1570 .vop_readdir = tmpfs_readdir, 1571 .vop_readlink = tmpfs_readlink, 1572 .vop_inactive = tmpfs_inactive, 1573 .vop_reclaim = tmpfs_reclaim, 1574 .vop_print = tmpfs_print, 1575 .vop_pathconf = tmpfs_pathconf, 1576 .vop_vptofh = tmpfs_vptofh, 1577 .vop_whiteout = tmpfs_whiteout, 1578 .vop_bmap = VOP_EOPNOTSUPP, 1579 .vop_vptocnp = tmpfs_vptocnp, 1580}; 1581 1582/* 1583 * Same vector for mounts which do not use namecache. 1584 */ 1585struct vop_vector tmpfs_vnodeop_nonc_entries = { 1586 .vop_default = &tmpfs_vnodeop_entries, 1587 .vop_lookup = tmpfs_lookup, 1588}; 1589