tmpfs_vnops.c revision 328295
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 328295 2018-01-23 19:00:13Z jhb $"); 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 vm_object_t obj; 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 if (vp->v_type == VREG) { 401 obj = node->tn_reg.tn_aobj; 402 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 403 } else 404 vap->va_bytes = node->tn_size; 405 vap->va_filerev = 0; 406 407 return 0; 408} 409 410int 411tmpfs_setattr(struct vop_setattr_args *v) 412{ 413 struct vnode *vp = v->a_vp; 414 struct vattr *vap = v->a_vap; 415 struct ucred *cred = v->a_cred; 416 struct thread *td = curthread; 417 418 int error; 419 420 MPASS(VOP_ISLOCKED(vp)); 421 422 error = 0; 423 424 /* Abort if any unsettable attribute is given. */ 425 if (vap->va_type != VNON || 426 vap->va_nlink != VNOVAL || 427 vap->va_fsid != VNOVAL || 428 vap->va_fileid != VNOVAL || 429 vap->va_blocksize != VNOVAL || 430 vap->va_gen != VNOVAL || 431 vap->va_rdev != VNOVAL || 432 vap->va_bytes != VNOVAL) 433 error = EINVAL; 434 435 if (error == 0 && (vap->va_flags != VNOVAL)) 436 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 437 438 if (error == 0 && (vap->va_size != VNOVAL)) 439 error = tmpfs_chsize(vp, vap->va_size, cred, td); 440 441 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 442 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 443 444 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 445 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 446 447 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 448 vap->va_atime.tv_nsec != VNOVAL) || 449 (vap->va_mtime.tv_sec != VNOVAL && 450 vap->va_mtime.tv_nsec != VNOVAL) || 451 (vap->va_birthtime.tv_sec != VNOVAL && 452 vap->va_birthtime.tv_nsec != VNOVAL))) 453 error = tmpfs_chtimes(vp, vap, cred, td); 454 455 /* Update the node times. We give preference to the error codes 456 * generated by this function rather than the ones that may arise 457 * from tmpfs_update. */ 458 tmpfs_update(vp); 459 460 MPASS(VOP_ISLOCKED(vp)); 461 462 return error; 463} 464 465static int 466tmpfs_read(struct vop_read_args *v) 467{ 468 struct vnode *vp; 469 struct uio *uio; 470 struct tmpfs_node *node; 471 472 vp = v->a_vp; 473 if (vp->v_type != VREG) 474 return (EISDIR); 475 uio = v->a_uio; 476 if (uio->uio_offset < 0) 477 return (EINVAL); 478 node = VP_TO_TMPFS_NODE(vp); 479 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 480 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 481} 482 483static int 484tmpfs_write(struct vop_write_args *v) 485{ 486 struct vnode *vp; 487 struct uio *uio; 488 struct tmpfs_node *node; 489 off_t oldsize; 490 int error, ioflag; 491 492 vp = v->a_vp; 493 uio = v->a_uio; 494 ioflag = v->a_ioflag; 495 error = 0; 496 node = VP_TO_TMPFS_NODE(vp); 497 oldsize = node->tn_size; 498 499 if (uio->uio_offset < 0 || vp->v_type != VREG) 500 return (EINVAL); 501 if (uio->uio_resid == 0) 502 return (0); 503 if (ioflag & IO_APPEND) 504 uio->uio_offset = node->tn_size; 505 if (uio->uio_offset + uio->uio_resid > 506 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 507 return (EFBIG); 508 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 509 return (EFBIG); 510 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 511 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 512 FALSE); 513 if (error != 0) 514 goto out; 515 } 516 517 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 518 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 519 TMPFS_NODE_CHANGED; 520 if (node->tn_mode & (S_ISUID | S_ISGID)) { 521 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 522 node->tn_mode &= ~(S_ISUID | S_ISGID); 523 } 524 if (error != 0) 525 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 526 527out: 528 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 529 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 530 531 return (error); 532} 533 534static int 535tmpfs_fsync(struct vop_fsync_args *v) 536{ 537 struct vnode *vp = v->a_vp; 538 539 MPASS(VOP_ISLOCKED(vp)); 540 541 tmpfs_check_mtime(vp); 542 tmpfs_update(vp); 543 544 return 0; 545} 546 547static int 548tmpfs_remove(struct vop_remove_args *v) 549{ 550 struct vnode *dvp = v->a_dvp; 551 struct vnode *vp = v->a_vp; 552 553 int error; 554 struct tmpfs_dirent *de; 555 struct tmpfs_mount *tmp; 556 struct tmpfs_node *dnode; 557 struct tmpfs_node *node; 558 559 MPASS(VOP_ISLOCKED(dvp)); 560 MPASS(VOP_ISLOCKED(vp)); 561 562 if (vp->v_type == VDIR) { 563 error = EISDIR; 564 goto out; 565 } 566 567 dnode = VP_TO_TMPFS_DIR(dvp); 568 node = VP_TO_TMPFS_NODE(vp); 569 tmp = VFS_TO_TMPFS(vp->v_mount); 570 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 571 MPASS(de != NULL); 572 573 /* Files marked as immutable or append-only cannot be deleted. */ 574 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 575 (dnode->tn_flags & APPEND)) { 576 error = EPERM; 577 goto out; 578 } 579 580 /* Remove the entry from the directory; as it is a file, we do not 581 * have to change the number of hard links of the directory. */ 582 tmpfs_dir_detach(dvp, de); 583 if (v->a_cnp->cn_flags & DOWHITEOUT) 584 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 585 586 /* Free the directory entry we just deleted. Note that the node 587 * referred by it will not be removed until the vnode is really 588 * reclaimed. */ 589 tmpfs_free_dirent(tmp, de); 590 591 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 592 error = 0; 593 594out: 595 596 return error; 597} 598 599static int 600tmpfs_link(struct vop_link_args *v) 601{ 602 struct vnode *dvp = v->a_tdvp; 603 struct vnode *vp = v->a_vp; 604 struct componentname *cnp = v->a_cnp; 605 606 int error; 607 struct tmpfs_dirent *de; 608 struct tmpfs_node *node; 609 610 MPASS(VOP_ISLOCKED(dvp)); 611 MPASS(cnp->cn_flags & HASBUF); 612 MPASS(dvp != vp); /* XXX When can this be false? */ 613 node = VP_TO_TMPFS_NODE(vp); 614 615 /* Ensure that we do not overflow the maximum number of links imposed 616 * by the system. */ 617 MPASS(node->tn_links <= LINK_MAX); 618 if (node->tn_links == LINK_MAX) { 619 error = EMLINK; 620 goto out; 621 } 622 623 /* We cannot create links of files marked immutable or append-only. */ 624 if (node->tn_flags & (IMMUTABLE | APPEND)) { 625 error = EPERM; 626 goto out; 627 } 628 629 /* Allocate a new directory entry to represent the node. */ 630 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 631 cnp->cn_nameptr, cnp->cn_namelen, &de); 632 if (error != 0) 633 goto out; 634 635 /* Insert the new directory entry into the appropriate directory. */ 636 if (cnp->cn_flags & ISWHITEOUT) 637 tmpfs_dir_whiteout_remove(dvp, cnp); 638 tmpfs_dir_attach(dvp, de); 639 640 /* vp link count has changed, so update node times. */ 641 node->tn_status |= TMPFS_NODE_CHANGED; 642 tmpfs_update(vp); 643 644 error = 0; 645 646out: 647 return error; 648} 649 650/* 651 * We acquire all but fdvp locks using non-blocking acquisitions. If we 652 * fail to acquire any lock in the path we will drop all held locks, 653 * acquire the new lock in a blocking fashion, and then release it and 654 * restart the rename. This acquire/release step ensures that we do not 655 * spin on a lock waiting for release. On error release all vnode locks 656 * and decrement references the way tmpfs_rename() would do. 657 */ 658static int 659tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 660 struct vnode *tdvp, struct vnode **tvpp, 661 struct componentname *fcnp, struct componentname *tcnp) 662{ 663 struct vnode *nvp; 664 struct mount *mp; 665 struct tmpfs_dirent *de; 666 int error, restarts = 0; 667 668 VOP_UNLOCK(tdvp, 0); 669 if (*tvpp != NULL && *tvpp != tdvp) 670 VOP_UNLOCK(*tvpp, 0); 671 mp = fdvp->v_mount; 672 673relock: 674 restarts += 1; 675 error = vn_lock(fdvp, LK_EXCLUSIVE); 676 if (error) 677 goto releout; 678 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 679 VOP_UNLOCK(fdvp, 0); 680 error = vn_lock(tdvp, LK_EXCLUSIVE); 681 if (error) 682 goto releout; 683 VOP_UNLOCK(tdvp, 0); 684 goto relock; 685 } 686 /* 687 * Re-resolve fvp to be certain it still exists and fetch the 688 * correct vnode. 689 */ 690 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 691 if (de == NULL) { 692 VOP_UNLOCK(fdvp, 0); 693 VOP_UNLOCK(tdvp, 0); 694 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 695 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 696 error = EINVAL; 697 else 698 error = ENOENT; 699 goto releout; 700 } 701 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 702 if (error != 0) { 703 VOP_UNLOCK(fdvp, 0); 704 VOP_UNLOCK(tdvp, 0); 705 if (error != EBUSY) 706 goto releout; 707 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 708 if (error != 0) 709 goto releout; 710 VOP_UNLOCK(nvp, 0); 711 /* 712 * Concurrent rename race. 713 */ 714 if (nvp == tdvp) { 715 vrele(nvp); 716 error = EINVAL; 717 goto releout; 718 } 719 vrele(*fvpp); 720 *fvpp = nvp; 721 goto relock; 722 } 723 vrele(*fvpp); 724 *fvpp = nvp; 725 VOP_UNLOCK(*fvpp, 0); 726 /* 727 * Re-resolve tvp and acquire the vnode lock if present. 728 */ 729 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 730 /* 731 * If tvp disappeared we just carry on. 732 */ 733 if (de == NULL && *tvpp != NULL) { 734 vrele(*tvpp); 735 *tvpp = NULL; 736 } 737 /* 738 * Get the tvp ino if the lookup succeeded. We may have to restart 739 * if the non-blocking acquire fails. 740 */ 741 if (de != NULL) { 742 nvp = NULL; 743 error = tmpfs_alloc_vp(mp, de->td_node, 744 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 745 if (*tvpp != NULL) 746 vrele(*tvpp); 747 *tvpp = nvp; 748 if (error != 0) { 749 VOP_UNLOCK(fdvp, 0); 750 VOP_UNLOCK(tdvp, 0); 751 if (error != EBUSY) 752 goto releout; 753 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 754 &nvp); 755 if (error != 0) 756 goto releout; 757 VOP_UNLOCK(nvp, 0); 758 /* 759 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 760 */ 761 if (nvp == fdvp) { 762 error = ENOTEMPTY; 763 goto releout; 764 } 765 goto relock; 766 } 767 } 768 tmpfs_rename_restarts += restarts; 769 770 return (0); 771 772releout: 773 vrele(fdvp); 774 vrele(*fvpp); 775 vrele(tdvp); 776 if (*tvpp != NULL) 777 vrele(*tvpp); 778 tmpfs_rename_restarts += restarts; 779 780 return (error); 781} 782 783static int 784tmpfs_rename(struct vop_rename_args *v) 785{ 786 struct vnode *fdvp = v->a_fdvp; 787 struct vnode *fvp = v->a_fvp; 788 struct componentname *fcnp = v->a_fcnp; 789 struct vnode *tdvp = v->a_tdvp; 790 struct vnode *tvp = v->a_tvp; 791 struct componentname *tcnp = v->a_tcnp; 792 struct mount *mp = NULL; 793 794 char *newname; 795 int error; 796 struct tmpfs_dirent *de; 797 struct tmpfs_mount *tmp; 798 struct tmpfs_node *fdnode; 799 struct tmpfs_node *fnode; 800 struct tmpfs_node *tnode; 801 struct tmpfs_node *tdnode; 802 803 MPASS(VOP_ISLOCKED(tdvp)); 804 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 805 MPASS(fcnp->cn_flags & HASBUF); 806 MPASS(tcnp->cn_flags & HASBUF); 807 808 /* Disallow cross-device renames. 809 * XXX Why isn't this done by the caller? */ 810 if (fvp->v_mount != tdvp->v_mount || 811 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 812 error = EXDEV; 813 goto out; 814 } 815 816 /* If source and target are the same file, there is nothing to do. */ 817 if (fvp == tvp) { 818 error = 0; 819 goto out; 820 } 821 822 /* If we need to move the directory between entries, lock the 823 * source so that we can safely operate on it. */ 824 if (fdvp != tdvp && fdvp != tvp) { 825 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 826 mp = tdvp->v_mount; 827 error = vfs_busy(mp, 0); 828 if (error != 0) { 829 mp = NULL; 830 goto out; 831 } 832 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 833 fcnp, tcnp); 834 if (error != 0) { 835 vfs_unbusy(mp); 836 return (error); 837 } 838 ASSERT_VOP_ELOCKED(fdvp, 839 "tmpfs_rename: fdvp not locked"); 840 ASSERT_VOP_ELOCKED(tdvp, 841 "tmpfs_rename: tdvp not locked"); 842 if (tvp != NULL) 843 ASSERT_VOP_ELOCKED(tvp, 844 "tmpfs_rename: tvp not locked"); 845 if (fvp == tvp) { 846 error = 0; 847 goto out_locked; 848 } 849 } 850 } 851 852 tmp = VFS_TO_TMPFS(tdvp->v_mount); 853 tdnode = VP_TO_TMPFS_DIR(tdvp); 854 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 855 fdnode = VP_TO_TMPFS_DIR(fdvp); 856 fnode = VP_TO_TMPFS_NODE(fvp); 857 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 858 859 /* Entry can disappear before we lock fdvp, 860 * also avoid manipulating '.' and '..' entries. */ 861 if (de == NULL) { 862 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 863 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 864 error = EINVAL; 865 else 866 error = ENOENT; 867 goto out_locked; 868 } 869 MPASS(de->td_node == fnode); 870 871 /* If re-naming a directory to another preexisting directory 872 * ensure that the target directory is empty so that its 873 * removal causes no side effects. 874 * Kern_rename guarantees the destination to be a directory 875 * if the source is one. */ 876 if (tvp != NULL) { 877 MPASS(tnode != NULL); 878 879 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 880 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 881 error = EPERM; 882 goto out_locked; 883 } 884 885 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 886 if (tnode->tn_size > 0) { 887 error = ENOTEMPTY; 888 goto out_locked; 889 } 890 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 891 error = ENOTDIR; 892 goto out_locked; 893 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 894 error = EISDIR; 895 goto out_locked; 896 } else { 897 MPASS(fnode->tn_type != VDIR && 898 tnode->tn_type != VDIR); 899 } 900 } 901 902 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 903 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 904 error = EPERM; 905 goto out_locked; 906 } 907 908 /* Ensure that we have enough memory to hold the new name, if it 909 * has to be changed. */ 910 if (fcnp->cn_namelen != tcnp->cn_namelen || 911 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 912 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 913 } else 914 newname = NULL; 915 916 /* If the node is being moved to another directory, we have to do 917 * the move. */ 918 if (fdnode != tdnode) { 919 /* In case we are moving a directory, we have to adjust its 920 * parent to point to the new parent. */ 921 if (de->td_node->tn_type == VDIR) { 922 struct tmpfs_node *n; 923 924 /* Ensure the target directory is not a child of the 925 * directory being moved. Otherwise, we'd end up 926 * with stale nodes. */ 927 n = tdnode; 928 /* TMPFS_LOCK garanties that no nodes are freed while 929 * traversing the list. Nodes can only be marked as 930 * removed: tn_parent == NULL. */ 931 TMPFS_LOCK(tmp); 932 TMPFS_NODE_LOCK(n); 933 while (n != n->tn_dir.tn_parent) { 934 struct tmpfs_node *parent; 935 936 if (n == fnode) { 937 TMPFS_NODE_UNLOCK(n); 938 TMPFS_UNLOCK(tmp); 939 error = EINVAL; 940 if (newname != NULL) 941 free(newname, M_TMPFSNAME); 942 goto out_locked; 943 } 944 parent = n->tn_dir.tn_parent; 945 TMPFS_NODE_UNLOCK(n); 946 if (parent == NULL) { 947 n = NULL; 948 break; 949 } 950 TMPFS_NODE_LOCK(parent); 951 if (parent->tn_dir.tn_parent == NULL) { 952 TMPFS_NODE_UNLOCK(parent); 953 n = NULL; 954 break; 955 } 956 n = parent; 957 } 958 TMPFS_UNLOCK(tmp); 959 if (n == NULL) { 960 error = EINVAL; 961 if (newname != NULL) 962 free(newname, M_TMPFSNAME); 963 goto out_locked; 964 } 965 TMPFS_NODE_UNLOCK(n); 966 967 /* Adjust the parent pointer. */ 968 TMPFS_VALIDATE_DIR(fnode); 969 TMPFS_NODE_LOCK(de->td_node); 970 de->td_node->tn_dir.tn_parent = tdnode; 971 TMPFS_NODE_UNLOCK(de->td_node); 972 973 /* As a result of changing the target of the '..' 974 * entry, the link count of the source and target 975 * directories has to be adjusted. */ 976 TMPFS_NODE_LOCK(tdnode); 977 TMPFS_ASSERT_LOCKED(tdnode); 978 tdnode->tn_links++; 979 TMPFS_NODE_UNLOCK(tdnode); 980 981 TMPFS_NODE_LOCK(fdnode); 982 TMPFS_ASSERT_LOCKED(fdnode); 983 fdnode->tn_links--; 984 TMPFS_NODE_UNLOCK(fdnode); 985 } 986 } 987 988 /* Do the move: just remove the entry from the source directory 989 * and insert it into the target one. */ 990 tmpfs_dir_detach(fdvp, de); 991 992 if (fcnp->cn_flags & DOWHITEOUT) 993 tmpfs_dir_whiteout_add(fdvp, fcnp); 994 if (tcnp->cn_flags & ISWHITEOUT) 995 tmpfs_dir_whiteout_remove(tdvp, tcnp); 996 997 /* If the name has changed, we need to make it effective by changing 998 * it in the directory entry. */ 999 if (newname != NULL) { 1000 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1001 1002 free(de->ud.td_name, M_TMPFSNAME); 1003 de->ud.td_name = newname; 1004 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1005 1006 fnode->tn_status |= TMPFS_NODE_CHANGED; 1007 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1008 } 1009 1010 /* If we are overwriting an entry, we have to remove the old one 1011 * from the target directory. */ 1012 if (tvp != NULL) { 1013 struct tmpfs_dirent *tde; 1014 1015 /* Remove the old entry from the target directory. */ 1016 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1017 tmpfs_dir_detach(tdvp, tde); 1018 1019 /* Free the directory entry we just deleted. Note that the 1020 * node referred by it will not be removed until the vnode is 1021 * really reclaimed. */ 1022 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1023 } 1024 1025 tmpfs_dir_attach(tdvp, de); 1026 1027 if (tmpfs_use_nc(fvp)) { 1028 cache_purge(fvp); 1029 if (tvp != NULL) 1030 cache_purge(tvp); 1031 cache_purge_negative(tdvp); 1032 } 1033 1034 error = 0; 1035 1036out_locked: 1037 if (fdvp != tdvp && fdvp != tvp) 1038 VOP_UNLOCK(fdvp, 0); 1039 1040out: 1041 /* Release target nodes. */ 1042 /* XXX: I don't understand when tdvp can be the same as tvp, but 1043 * other code takes care of this... */ 1044 if (tdvp == tvp) 1045 vrele(tdvp); 1046 else 1047 vput(tdvp); 1048 if (tvp != NULL) 1049 vput(tvp); 1050 1051 /* Release source nodes. */ 1052 vrele(fdvp); 1053 vrele(fvp); 1054 1055 if (mp != NULL) 1056 vfs_unbusy(mp); 1057 1058 return error; 1059} 1060 1061static int 1062tmpfs_mkdir(struct vop_mkdir_args *v) 1063{ 1064 struct vnode *dvp = v->a_dvp; 1065 struct vnode **vpp = v->a_vpp; 1066 struct componentname *cnp = v->a_cnp; 1067 struct vattr *vap = v->a_vap; 1068 1069 MPASS(vap->va_type == VDIR); 1070 1071 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1072} 1073 1074static int 1075tmpfs_rmdir(struct vop_rmdir_args *v) 1076{ 1077 struct vnode *dvp = v->a_dvp; 1078 struct vnode *vp = v->a_vp; 1079 1080 int error; 1081 struct tmpfs_dirent *de; 1082 struct tmpfs_mount *tmp; 1083 struct tmpfs_node *dnode; 1084 struct tmpfs_node *node; 1085 1086 MPASS(VOP_ISLOCKED(dvp)); 1087 MPASS(VOP_ISLOCKED(vp)); 1088 1089 tmp = VFS_TO_TMPFS(dvp->v_mount); 1090 dnode = VP_TO_TMPFS_DIR(dvp); 1091 node = VP_TO_TMPFS_DIR(vp); 1092 1093 /* Directories with more than two entries ('.' and '..') cannot be 1094 * removed. */ 1095 if (node->tn_size > 0) { 1096 error = ENOTEMPTY; 1097 goto out; 1098 } 1099 1100 if ((dnode->tn_flags & APPEND) 1101 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1102 error = EPERM; 1103 goto out; 1104 } 1105 1106 /* This invariant holds only if we are not trying to remove "..". 1107 * We checked for that above so this is safe now. */ 1108 MPASS(node->tn_dir.tn_parent == dnode); 1109 1110 /* Get the directory entry associated with node (vp). This was 1111 * filled by tmpfs_lookup while looking up the entry. */ 1112 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1113 MPASS(TMPFS_DIRENT_MATCHES(de, 1114 v->a_cnp->cn_nameptr, 1115 v->a_cnp->cn_namelen)); 1116 1117 /* Check flags to see if we are allowed to remove the directory. */ 1118 if ((dnode->tn_flags & APPEND) != 0 || 1119 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1120 error = EPERM; 1121 goto out; 1122 } 1123 1124 1125 /* Detach the directory entry from the directory (dnode). */ 1126 tmpfs_dir_detach(dvp, de); 1127 if (v->a_cnp->cn_flags & DOWHITEOUT) 1128 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1129 1130 /* No vnode should be allocated for this entry from this point */ 1131 TMPFS_NODE_LOCK(node); 1132 node->tn_links--; 1133 node->tn_dir.tn_parent = NULL; 1134 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1135 TMPFS_NODE_MODIFIED; 1136 1137 TMPFS_NODE_UNLOCK(node); 1138 1139 TMPFS_NODE_LOCK(dnode); 1140 dnode->tn_links--; 1141 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1142 TMPFS_NODE_MODIFIED; 1143 TMPFS_NODE_UNLOCK(dnode); 1144 1145 if (tmpfs_use_nc(dvp)) { 1146 cache_purge(dvp); 1147 cache_purge(vp); 1148 } 1149 1150 /* Free the directory entry we just deleted. Note that the node 1151 * referred by it will not be removed until the vnode is really 1152 * reclaimed. */ 1153 tmpfs_free_dirent(tmp, de); 1154 1155 /* Release the deleted vnode (will destroy the node, notify 1156 * interested parties and clean it from the cache). */ 1157 1158 dnode->tn_status |= TMPFS_NODE_CHANGED; 1159 tmpfs_update(dvp); 1160 1161 error = 0; 1162 1163out: 1164 return error; 1165} 1166 1167static int 1168tmpfs_symlink(struct vop_symlink_args *v) 1169{ 1170 struct vnode *dvp = v->a_dvp; 1171 struct vnode **vpp = v->a_vpp; 1172 struct componentname *cnp = v->a_cnp; 1173 struct vattr *vap = v->a_vap; 1174 char *target = v->a_target; 1175 1176#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1177 MPASS(vap->va_type == VLNK); 1178#else 1179 vap->va_type = VLNK; 1180#endif 1181 1182 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1183} 1184 1185static int 1186tmpfs_readdir(struct vop_readdir_args *v) 1187{ 1188 struct vnode *vp = v->a_vp; 1189 struct uio *uio = v->a_uio; 1190 int *eofflag = v->a_eofflag; 1191 u_long **cookies = v->a_cookies; 1192 int *ncookies = v->a_ncookies; 1193 1194 int error; 1195 ssize_t startresid; 1196 int maxcookies; 1197 struct tmpfs_node *node; 1198 1199 /* This operation only makes sense on directory nodes. */ 1200 if (vp->v_type != VDIR) 1201 return ENOTDIR; 1202 1203 maxcookies = 0; 1204 node = VP_TO_TMPFS_DIR(vp); 1205 1206 startresid = uio->uio_resid; 1207 1208 /* Allocate cookies for NFS and compat modules. */ 1209 if (cookies != NULL && ncookies != NULL) { 1210 maxcookies = howmany(node->tn_size, 1211 sizeof(struct tmpfs_dirent)) + 2; 1212 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1213 M_WAITOK); 1214 *ncookies = 0; 1215 } 1216 1217 if (cookies == NULL) 1218 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1219 else 1220 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1221 ncookies); 1222 1223 /* Buffer was filled without hitting EOF. */ 1224 if (error == EJUSTRETURN) 1225 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1226 1227 if (error != 0 && cookies != NULL && ncookies != NULL) { 1228 free(*cookies, M_TEMP); 1229 *cookies = NULL; 1230 *ncookies = 0; 1231 } 1232 1233 if (eofflag != NULL) 1234 *eofflag = 1235 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1236 1237 return error; 1238} 1239 1240static int 1241tmpfs_readlink(struct vop_readlink_args *v) 1242{ 1243 struct vnode *vp = v->a_vp; 1244 struct uio *uio = v->a_uio; 1245 1246 int error; 1247 struct tmpfs_node *node; 1248 1249 MPASS(uio->uio_offset == 0); 1250 MPASS(vp->v_type == VLNK); 1251 1252 node = VP_TO_TMPFS_NODE(vp); 1253 1254 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1255 uio); 1256 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1257 1258 return (error); 1259} 1260 1261static int 1262tmpfs_inactive(struct vop_inactive_args *v) 1263{ 1264 struct vnode *vp; 1265 struct tmpfs_node *node; 1266 1267 vp = v->a_vp; 1268 node = VP_TO_TMPFS_NODE(vp); 1269 if (node->tn_links == 0) 1270 vrecycle(vp); 1271 else 1272 tmpfs_check_mtime(vp); 1273 return (0); 1274} 1275 1276int 1277tmpfs_reclaim(struct vop_reclaim_args *v) 1278{ 1279 struct vnode *vp = v->a_vp; 1280 1281 struct tmpfs_mount *tmp; 1282 struct tmpfs_node *node; 1283 1284 node = VP_TO_TMPFS_NODE(vp); 1285 tmp = VFS_TO_TMPFS(vp->v_mount); 1286 1287 if (vp->v_type == VREG) 1288 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1289 else 1290 vnode_destroy_vobject(vp); 1291 vp->v_object = NULL; 1292 if (tmpfs_use_nc(vp)) 1293 cache_purge(vp); 1294 1295 TMPFS_NODE_LOCK(node); 1296 tmpfs_free_vp(vp); 1297 1298 /* If the node referenced by this vnode was deleted by the user, 1299 * we must free its associated data structures (now that the vnode 1300 * is being reclaimed). */ 1301 if (node->tn_links == 0 && 1302 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1303 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1304 TMPFS_NODE_UNLOCK(node); 1305 tmpfs_free_node(tmp, node); 1306 } else 1307 TMPFS_NODE_UNLOCK(node); 1308 1309 MPASS(vp->v_data == NULL); 1310 return 0; 1311} 1312 1313int 1314tmpfs_print(struct vop_print_args *v) 1315{ 1316 struct vnode *vp = v->a_vp; 1317 1318 struct tmpfs_node *node; 1319 1320 node = VP_TO_TMPFS_NODE(vp); 1321 1322 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1323 node, node->tn_flags, (uintmax_t)node->tn_links); 1324 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1325 node->tn_mode, node->tn_uid, node->tn_gid, 1326 (intmax_t)node->tn_size, node->tn_status); 1327 1328 if (vp->v_type == VFIFO) 1329 fifo_printinfo(vp); 1330 1331 printf("\n"); 1332 1333 return 0; 1334} 1335 1336static int 1337tmpfs_pathconf(struct vop_pathconf_args *v) 1338{ 1339 int name = v->a_name; 1340 register_t *retval = v->a_retval; 1341 1342 int error; 1343 1344 error = 0; 1345 1346 switch (name) { 1347 case _PC_LINK_MAX: 1348 *retval = LINK_MAX; 1349 break; 1350 1351 case _PC_NAME_MAX: 1352 *retval = NAME_MAX; 1353 break; 1354 1355 case _PC_PATH_MAX: 1356 *retval = PATH_MAX; 1357 break; 1358 1359 case _PC_PIPE_BUF: 1360 *retval = PIPE_BUF; 1361 break; 1362 1363 case _PC_CHOWN_RESTRICTED: 1364 *retval = 1; 1365 break; 1366 1367 case _PC_NO_TRUNC: 1368 *retval = 1; 1369 break; 1370 1371 case _PC_SYNC_IO: 1372 *retval = 1; 1373 break; 1374 1375 case _PC_FILESIZEBITS: 1376 *retval = 0; /* XXX Don't know which value should I return. */ 1377 break; 1378 1379 default: 1380 error = EINVAL; 1381 } 1382 1383 return error; 1384} 1385 1386static int 1387tmpfs_vptofh(struct vop_vptofh_args *ap) 1388{ 1389 struct tmpfs_fid *tfhp; 1390 struct tmpfs_node *node; 1391 1392 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1393 node = VP_TO_TMPFS_NODE(ap->a_vp); 1394 1395 tfhp->tf_len = sizeof(struct tmpfs_fid); 1396 tfhp->tf_id = node->tn_id; 1397 tfhp->tf_gen = node->tn_gen; 1398 1399 return (0); 1400} 1401 1402static int 1403tmpfs_whiteout(struct vop_whiteout_args *ap) 1404{ 1405 struct vnode *dvp = ap->a_dvp; 1406 struct componentname *cnp = ap->a_cnp; 1407 struct tmpfs_dirent *de; 1408 1409 switch (ap->a_flags) { 1410 case LOOKUP: 1411 return (0); 1412 case CREATE: 1413 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1414 if (de != NULL) 1415 return (de->td_node == NULL ? 0 : EEXIST); 1416 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1417 case DELETE: 1418 tmpfs_dir_whiteout_remove(dvp, cnp); 1419 return (0); 1420 default: 1421 panic("tmpfs_whiteout: unknown op"); 1422 } 1423} 1424 1425static int 1426tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1427 struct tmpfs_dirent **pde) 1428{ 1429 struct tmpfs_dir_cursor dc; 1430 struct tmpfs_dirent *de; 1431 1432 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1433 de = tmpfs_dir_next(tnp, &dc)) { 1434 if (de->td_node == tn) { 1435 *pde = de; 1436 return (0); 1437 } 1438 } 1439 return (ENOENT); 1440} 1441 1442static int 1443tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1444 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1445{ 1446 struct tmpfs_dirent *de; 1447 int error, i; 1448 1449 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1450 dvp); 1451 if (error != 0) 1452 return (error); 1453 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1454 if (error == 0) { 1455 i = *buflen; 1456 i -= de->td_namelen; 1457 if (i < 0) { 1458 error = ENOMEM; 1459 } else { 1460 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1461 *buflen = i; 1462 } 1463 } 1464 if (error == 0) { 1465 if (vp != *dvp) 1466 VOP_UNLOCK(*dvp, 0); 1467 } else { 1468 if (vp != *dvp) 1469 vput(*dvp); 1470 else 1471 vrele(vp); 1472 } 1473 return (error); 1474} 1475 1476static int 1477tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1478{ 1479 struct vnode *vp, **dvp; 1480 struct tmpfs_node *tn, *tnp, *tnp1; 1481 struct tmpfs_dirent *de; 1482 struct tmpfs_mount *tm; 1483 char *buf; 1484 int *buflen; 1485 int error; 1486 1487 vp = ap->a_vp; 1488 dvp = ap->a_vpp; 1489 buf = ap->a_buf; 1490 buflen = ap->a_buflen; 1491 1492 tm = VFS_TO_TMPFS(vp->v_mount); 1493 tn = VP_TO_TMPFS_NODE(vp); 1494 if (tn->tn_type == VDIR) { 1495 tnp = tn->tn_dir.tn_parent; 1496 if (tnp == NULL) 1497 return (ENOENT); 1498 tmpfs_ref_node(tnp); 1499 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1500 buflen, dvp); 1501 tmpfs_free_node(tm, tnp); 1502 return (error); 1503 } 1504restart: 1505 TMPFS_LOCK(tm); 1506 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1507 if (tnp->tn_type != VDIR) 1508 continue; 1509 TMPFS_NODE_LOCK(tnp); 1510 tmpfs_ref_node_locked(tnp); 1511 1512 /* 1513 * tn_vnode cannot be instantiated while we hold the 1514 * node lock, so the directory cannot be changed while 1515 * we iterate over it. Do this to avoid instantiating 1516 * vnode for directories which cannot point to our 1517 * node. 1518 */ 1519 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1520 &de) : 0; 1521 1522 if (error == 0) { 1523 TMPFS_NODE_UNLOCK(tnp); 1524 TMPFS_UNLOCK(tm); 1525 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1526 dvp); 1527 if (error == 0) { 1528 tmpfs_free_node(tm, tnp); 1529 return (0); 1530 } 1531 if ((vp->v_iflag & VI_DOOMED) != 0) { 1532 tmpfs_free_node(tm, tnp); 1533 return (ENOENT); 1534 } 1535 TMPFS_LOCK(tm); 1536 TMPFS_NODE_LOCK(tnp); 1537 } 1538 if (tmpfs_free_node_locked(tm, tnp, false)) { 1539 goto restart; 1540 } else { 1541 KASSERT(tnp->tn_refcount > 0, 1542 ("node %p refcount zero", tnp)); 1543 tnp1 = LIST_NEXT(tnp, tn_entries); 1544 TMPFS_NODE_UNLOCK(tnp); 1545 } 1546 } 1547 TMPFS_UNLOCK(tm); 1548 return (ENOENT); 1549} 1550 1551/* 1552 * Vnode operations vector used for files stored in a tmpfs file system. 1553 */ 1554struct vop_vector tmpfs_vnodeop_entries = { 1555 .vop_default = &default_vnodeops, 1556 .vop_lookup = vfs_cache_lookup, 1557 .vop_cachedlookup = tmpfs_cached_lookup, 1558 .vop_create = tmpfs_create, 1559 .vop_mknod = tmpfs_mknod, 1560 .vop_open = tmpfs_open, 1561 .vop_close = tmpfs_close, 1562 .vop_access = tmpfs_access, 1563 .vop_getattr = tmpfs_getattr, 1564 .vop_setattr = tmpfs_setattr, 1565 .vop_read = tmpfs_read, 1566 .vop_write = tmpfs_write, 1567 .vop_fsync = tmpfs_fsync, 1568 .vop_remove = tmpfs_remove, 1569 .vop_link = tmpfs_link, 1570 .vop_rename = tmpfs_rename, 1571 .vop_mkdir = tmpfs_mkdir, 1572 .vop_rmdir = tmpfs_rmdir, 1573 .vop_symlink = tmpfs_symlink, 1574 .vop_readdir = tmpfs_readdir, 1575 .vop_readlink = tmpfs_readlink, 1576 .vop_inactive = tmpfs_inactive, 1577 .vop_reclaim = tmpfs_reclaim, 1578 .vop_print = tmpfs_print, 1579 .vop_pathconf = tmpfs_pathconf, 1580 .vop_vptofh = tmpfs_vptofh, 1581 .vop_whiteout = tmpfs_whiteout, 1582 .vop_bmap = VOP_EOPNOTSUPP, 1583 .vop_vptocnp = tmpfs_vptocnp, 1584}; 1585 1586/* 1587 * Same vector for mounts which do not use namecache. 1588 */ 1589struct vop_vector tmpfs_vnodeop_nonc_entries = { 1590 .vop_default = &tmpfs_vnodeop_entries, 1591 .vop_lookup = tmpfs_lookup, 1592}; 1593