1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 11 * 2005 program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * tmpfs vnode interface. 37 */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/dirent.h> 44 #include <sys/fcntl.h> 45 #include <sys/limits.h> 46 #include <sys/lockf.h> 47 #include <sys/lock.h> 48 #include <sys/mount.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/rwlock.h> 53 #include <sys/sched.h> 54 #include <sys/stat.h> 55 #include <sys/sysctl.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_param.h> 61 #include <vm/vm_object.h> 62 63 #include <fs/tmpfs/tmpfs_vnops.h> 64 #include <fs/tmpfs/tmpfs.h> 65 66 SYSCTL_DECL(_vfs_tmpfs); 67 68 static volatile int tmpfs_rename_restarts; 69 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 70 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 71 "Times rename had to restart due to lock contention"); 72 73 static int 74 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 75 struct vnode **rvp) 76 { 77 78 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 79 } 80 81 static int 82 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 83 { 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 && tmpfs_use_nc(dvp)) 217 cache_enter(dvp, *vpp, cnp); 218 219 out: 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 } 228 229 static int 230 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 231 { 232 233 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 234 } 235 236 static int 237 tmpfs_lookup(struct vop_lookup_args *v) 238 { 239 240 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 241 } 242 243 static int 244 tmpfs_create(struct vop_create_args *v) 245 { 246 struct vnode *dvp = v->a_dvp; 247 struct vnode **vpp = v->a_vpp; 248 struct componentname *cnp = v->a_cnp; 249 struct vattr *vap = v->a_vap; 250 int error; 251 252 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 253 254 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 255 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 256 cache_enter(dvp, *vpp, cnp); 257 return (error); 258 } 259 260 static int 261 tmpfs_mknod(struct vop_mknod_args *v) 262 { 263 struct vnode *dvp = v->a_dvp; 264 struct vnode **vpp = v->a_vpp; 265 struct componentname *cnp = v->a_cnp; 266 struct vattr *vap = v->a_vap; 267 268 if (vap->va_type != VBLK && vap->va_type != VCHR && 269 vap->va_type != VFIFO) 270 return EINVAL; 271 272 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 273 } 274 275 static int 276 tmpfs_open(struct vop_open_args *v) 277 { 278 struct vnode *vp = v->a_vp; 279 int mode = v->a_mode; 280 281 int error; 282 struct tmpfs_node *node; 283 284 MPASS(VOP_ISLOCKED(vp)); 285 286 node = VP_TO_TMPFS_NODE(vp); 287 288 /* The file is still active but all its names have been removed 289 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 290 * it is about to die. */ 291 if (node->tn_links < 1) 292 return (ENOENT); 293 294 /* If the file is marked append-only, deny write requests. */ 295 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 296 error = EPERM; 297 else { 298 error = 0; 299 /* For regular files, the call below is nop. */ 300 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 301 OBJ_DEAD) == 0, ("dead object")); 302 vnode_create_vobject(vp, node->tn_size, v->a_td); 303 } 304 305 MPASS(VOP_ISLOCKED(vp)); 306 return error; 307 } 308 309 static int 310 tmpfs_close(struct vop_close_args *v) 311 { 312 struct vnode *vp = v->a_vp; 313 314 /* Update node times. */ 315 tmpfs_update(vp); 316 317 return (0); 318 } 319 320 int 321 tmpfs_access(struct vop_access_args *v) 322 { 323 struct vnode *vp = v->a_vp; 324 accmode_t accmode = v->a_accmode; 325 struct ucred *cred = v->a_cred; 326 327 int error; 328 struct tmpfs_node *node; 329 330 MPASS(VOP_ISLOCKED(vp)); 331 332 node = VP_TO_TMPFS_NODE(vp); 333 334 switch (vp->v_type) { 335 case VDIR: 336 /* FALLTHROUGH */ 337 case VLNK: 338 /* FALLTHROUGH */ 339 case VREG: 340 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 341 error = EROFS; 342 goto out; 343 } 344 break; 345 346 case VBLK: 347 /* FALLTHROUGH */ 348 case VCHR: 349 /* FALLTHROUGH */ 350 case VSOCK: 351 /* FALLTHROUGH */ 352 case VFIFO: 353 break; 354 355 default: 356 error = EINVAL; 357 goto out; 358 } 359 360 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 361 error = EPERM; 362 goto out; 363 } 364 365 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 366 node->tn_gid, accmode, cred, NULL); 367 368 out: 369 MPASS(VOP_ISLOCKED(vp)); 370 371 return error; 372 } 373 374 int 375 tmpfs_getattr(struct vop_getattr_args *v) 376 { 377 struct vnode *vp = v->a_vp; 378 struct vattr *vap = v->a_vap; 379 vm_object_t obj; 380 struct tmpfs_node *node; 381 382 node = VP_TO_TMPFS_NODE(vp); 383 384 tmpfs_update(vp); 385 386 vap->va_type = vp->v_type; 387 vap->va_mode = node->tn_mode; 388 vap->va_nlink = node->tn_links; 389 vap->va_uid = node->tn_uid; 390 vap->va_gid = node->tn_gid; 391 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 392 vap->va_fileid = node->tn_id; 393 vap->va_size = node->tn_size; 394 vap->va_blocksize = PAGE_SIZE; 395 vap->va_atime = node->tn_atime; 396 vap->va_mtime = node->tn_mtime; 397 vap->va_ctime = node->tn_ctime; 398 vap->va_birthtime = node->tn_birthtime; 399 vap->va_gen = node->tn_gen; 400 vap->va_flags = node->tn_flags; 401 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 402 node->tn_rdev : NODEV; 403 if (vp->v_type == VREG) { 404 obj = node->tn_reg.tn_aobj; 405 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 406 } else 407 vap->va_bytes = node->tn_size; 408 vap->va_filerev = 0; 409 410 return 0; 411 } 412 413 int 414 tmpfs_setattr(struct vop_setattr_args *v) 415 { 416 struct vnode *vp = v->a_vp; 417 struct vattr *vap = v->a_vap; 418 struct ucred *cred = v->a_cred; 419 struct thread *td = curthread; 420 421 int error; 422 423 MPASS(VOP_ISLOCKED(vp)); 424 425 error = 0; 426 427 /* Abort if any unsettable attribute is given. */ 428 if (vap->va_type != VNON || 429 vap->va_nlink != VNOVAL || 430 vap->va_fsid != VNOVAL || 431 vap->va_fileid != VNOVAL || 432 vap->va_blocksize != VNOVAL || 433 vap->va_gen != VNOVAL || 434 vap->va_rdev != VNOVAL || 435 vap->va_bytes != VNOVAL) 436 error = EINVAL; 437 438 if (error == 0 && (vap->va_flags != VNOVAL)) 439 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 440 441 if (error == 0 && (vap->va_size != VNOVAL)) 442 error = tmpfs_chsize(vp, vap->va_size, cred, td); 443 444 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 445 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 446 447 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 448 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 449 450 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 451 vap->va_atime.tv_nsec != VNOVAL) || 452 (vap->va_mtime.tv_sec != VNOVAL && 453 vap->va_mtime.tv_nsec != VNOVAL) || 454 (vap->va_birthtime.tv_sec != VNOVAL && 455 vap->va_birthtime.tv_nsec != VNOVAL))) 456 error = tmpfs_chtimes(vp, vap, cred, td); 457 458 /* Update the node times. We give preference to the error codes 459 * generated by this function rather than the ones that may arise 460 * from tmpfs_update. */ 461 tmpfs_update(vp); 462 463 MPASS(VOP_ISLOCKED(vp)); 464 465 return error; 466 } 467 468 static int 469 tmpfs_read(struct vop_read_args *v) 470 { 471 struct vnode *vp; 472 struct uio *uio; 473 struct tmpfs_node *node; 474 475 vp = v->a_vp; 476 if (vp->v_type != VREG) 477 return (EISDIR); 478 uio = v->a_uio; 479 if (uio->uio_offset < 0) 480 return (EINVAL); 481 node = VP_TO_TMPFS_NODE(vp); 482 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 483 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 484 } 485 486 static int 487 tmpfs_write(struct vop_write_args *v) 488 { 489 struct vnode *vp; 490 struct uio *uio; 491 struct tmpfs_node *node; 492 off_t oldsize; 493 int error, ioflag; 494 495 vp = v->a_vp; 496 uio = v->a_uio; 497 ioflag = v->a_ioflag; 498 error = 0; 499 node = VP_TO_TMPFS_NODE(vp); 500 oldsize = node->tn_size; 501 502 if (uio->uio_offset < 0 || vp->v_type != VREG) 503 return (EINVAL); 504 if (uio->uio_resid == 0) 505 return (0); 506 if (ioflag & IO_APPEND) 507 uio->uio_offset = node->tn_size; 508 if (uio->uio_offset + uio->uio_resid > 509 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 510 return (EFBIG); 511 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 512 return (EFBIG); 513 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 514 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 515 FALSE); 516 if (error != 0) 517 goto out; 518 } 519 520 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 521 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 522 TMPFS_NODE_CHANGED; 523 if (node->tn_mode & (S_ISUID | S_ISGID)) { 524 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID)) 525 node->tn_mode &= ~(S_ISUID | S_ISGID); 526 } 527 if (error != 0) 528 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 529 530 out: 531 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 532 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 533 534 return (error); 535 } 536 537 static int 538 tmpfs_fsync(struct vop_fsync_args *v) 539 { 540 struct vnode *vp = v->a_vp; 541 542 MPASS(VOP_ISLOCKED(vp)); 543 544 tmpfs_check_mtime(vp); 545 tmpfs_update(vp); 546 547 return 0; 548 } 549 550 static int 551 tmpfs_remove(struct vop_remove_args *v) 552 { 553 struct vnode *dvp = v->a_dvp; 554 struct vnode *vp = v->a_vp; 555 556 int error; 557 struct tmpfs_dirent *de; 558 struct tmpfs_mount *tmp; 559 struct tmpfs_node *dnode; 560 struct tmpfs_node *node; 561 562 MPASS(VOP_ISLOCKED(dvp)); 563 MPASS(VOP_ISLOCKED(vp)); 564 565 if (vp->v_type == VDIR) { 566 error = EISDIR; 567 goto out; 568 } 569 570 dnode = VP_TO_TMPFS_DIR(dvp); 571 node = VP_TO_TMPFS_NODE(vp); 572 tmp = VFS_TO_TMPFS(vp->v_mount); 573 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 574 MPASS(de != NULL); 575 576 /* Files marked as immutable or append-only cannot be deleted. */ 577 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 578 (dnode->tn_flags & APPEND)) { 579 error = EPERM; 580 goto out; 581 } 582 583 /* Remove the entry from the directory; as it is a file, we do not 584 * have to change the number of hard links of the directory. */ 585 tmpfs_dir_detach(dvp, de); 586 if (v->a_cnp->cn_flags & DOWHITEOUT) 587 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 588 589 /* Free the directory entry we just deleted. Note that the node 590 * referred by it will not be removed until the vnode is really 591 * reclaimed. */ 592 tmpfs_free_dirent(tmp, de); 593 594 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 595 error = 0; 596 597 out: 598 599 return error; 600 } 601 602 static int 603 tmpfs_link(struct vop_link_args *v) 604 { 605 struct vnode *dvp = v->a_tdvp; 606 struct vnode *vp = v->a_vp; 607 struct componentname *cnp = v->a_cnp; 608 609 int error; 610 struct tmpfs_dirent *de; 611 struct tmpfs_node *node; 612 613 MPASS(VOP_ISLOCKED(dvp)); 614 MPASS(cnp->cn_flags & HASBUF); 615 MPASS(dvp != vp); /* XXX When can this be false? */ 616 node = VP_TO_TMPFS_NODE(vp); 617 618 /* Ensure that we do not overflow the maximum number of links imposed 619 * by the system. */ 620 MPASS(node->tn_links <= TMPFS_LINK_MAX); 621 if (node->tn_links == TMPFS_LINK_MAX) { 622 error = EMLINK; 623 goto out; 624 } 625 626 /* We cannot create links of files marked immutable or append-only. */ 627 if (node->tn_flags & (IMMUTABLE | APPEND)) { 628 error = EPERM; 629 goto out; 630 } 631 632 /* Allocate a new directory entry to represent the node. */ 633 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 634 cnp->cn_nameptr, cnp->cn_namelen, &de); 635 if (error != 0) 636 goto out; 637 638 /* Insert the new directory entry into the appropriate directory. */ 639 if (cnp->cn_flags & ISWHITEOUT) 640 tmpfs_dir_whiteout_remove(dvp, cnp); 641 tmpfs_dir_attach(dvp, de); 642 643 /* vp link count has changed, so update node times. */ 644 node->tn_status |= TMPFS_NODE_CHANGED; 645 tmpfs_update(vp); 646 647 error = 0; 648 649 out: 650 return error; 651 } 652 653 /* 654 * We acquire all but fdvp locks using non-blocking acquisitions. If we 655 * fail to acquire any lock in the path we will drop all held locks, 656 * acquire the new lock in a blocking fashion, and then release it and 657 * restart the rename. This acquire/release step ensures that we do not 658 * spin on a lock waiting for release. On error release all vnode locks 659 * and decrement references the way tmpfs_rename() would do. 660 */ 661 static int 662 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 663 struct vnode *tdvp, struct vnode **tvpp, 664 struct componentname *fcnp, struct componentname *tcnp) 665 { 666 struct vnode *nvp; 667 struct mount *mp; 668 struct tmpfs_dirent *de; 669 int error, restarts = 0; 670 671 VOP_UNLOCK(tdvp, 0); 672 if (*tvpp != NULL && *tvpp != tdvp) 673 VOP_UNLOCK(*tvpp, 0); 674 mp = fdvp->v_mount; 675 676 relock: 677 restarts += 1; 678 error = vn_lock(fdvp, LK_EXCLUSIVE); 679 if (error) 680 goto releout; 681 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 682 VOP_UNLOCK(fdvp, 0); 683 error = vn_lock(tdvp, LK_EXCLUSIVE); 684 if (error) 685 goto releout; 686 VOP_UNLOCK(tdvp, 0); 687 goto relock; 688 } 689 /* 690 * Re-resolve fvp to be certain it still exists and fetch the 691 * correct vnode. 692 */ 693 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 694 if (de == NULL) { 695 VOP_UNLOCK(fdvp, 0); 696 VOP_UNLOCK(tdvp, 0); 697 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 698 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 699 error = EINVAL; 700 else 701 error = ENOENT; 702 goto releout; 703 } 704 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 705 if (error != 0) { 706 VOP_UNLOCK(fdvp, 0); 707 VOP_UNLOCK(tdvp, 0); 708 if (error != EBUSY) 709 goto releout; 710 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 711 if (error != 0) 712 goto releout; 713 VOP_UNLOCK(nvp, 0); 714 /* 715 * Concurrent rename race. 716 */ 717 if (nvp == tdvp) { 718 vrele(nvp); 719 error = EINVAL; 720 goto releout; 721 } 722 vrele(*fvpp); 723 *fvpp = nvp; 724 goto relock; 725 } 726 vrele(*fvpp); 727 *fvpp = nvp; 728 VOP_UNLOCK(*fvpp, 0); 729 /* 730 * Re-resolve tvp and acquire the vnode lock if present. 731 */ 732 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 733 /* 734 * If tvp disappeared we just carry on. 735 */ 736 if (de == NULL && *tvpp != NULL) { 737 vrele(*tvpp); 738 *tvpp = NULL; 739 } 740 /* 741 * Get the tvp ino if the lookup succeeded. We may have to restart 742 * if the non-blocking acquire fails. 743 */ 744 if (de != NULL) { 745 nvp = NULL; 746 error = tmpfs_alloc_vp(mp, de->td_node, 747 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 748 if (*tvpp != NULL) 749 vrele(*tvpp); 750 *tvpp = nvp; 751 if (error != 0) { 752 VOP_UNLOCK(fdvp, 0); 753 VOP_UNLOCK(tdvp, 0); 754 if (error != EBUSY) 755 goto releout; 756 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 757 &nvp); 758 if (error != 0) 759 goto releout; 760 VOP_UNLOCK(nvp, 0); 761 /* 762 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 763 */ 764 if (nvp == fdvp) { 765 error = ENOTEMPTY; 766 goto releout; 767 } 768 goto relock; 769 } 770 } 771 tmpfs_rename_restarts += restarts; 772 773 return (0); 774 775 releout: 776 vrele(fdvp); 777 vrele(*fvpp); 778 vrele(tdvp); 779 if (*tvpp != NULL) 780 vrele(*tvpp); 781 tmpfs_rename_restarts += restarts; 782 783 return (error); 784 } 785 786 static int 787 tmpfs_rename(struct vop_rename_args *v) 788 { 789 struct vnode *fdvp = v->a_fdvp; 790 struct vnode *fvp = v->a_fvp; 791 struct componentname *fcnp = v->a_fcnp; 792 struct vnode *tdvp = v->a_tdvp; 793 struct vnode *tvp = v->a_tvp; 794 struct componentname *tcnp = v->a_tcnp; 795 struct mount *mp = NULL; 796 char *newname; 797 struct tmpfs_dirent *de; 798 struct tmpfs_mount *tmp; 799 struct tmpfs_node *fdnode; 800 struct tmpfs_node *fnode; 801 struct tmpfs_node *tnode; 802 struct tmpfs_node *tdnode; 803 int error; 804 805 MPASS(VOP_ISLOCKED(tdvp)); 806 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 807 MPASS(fcnp->cn_flags & HASBUF); 808 MPASS(tcnp->cn_flags & HASBUF); 809 810 /* 811 * Disallow cross-device renames. 812 * XXX Why isn't this done by the caller? 813 */ 814 if (fvp->v_mount != tdvp->v_mount || 815 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 816 error = EXDEV; 817 goto out; 818 } 819 820 /* If source and target are the same file, there is nothing to do. */ 821 if (fvp == tvp) { 822 error = 0; 823 goto out; 824 } 825 826 /* 827 * If we need to move the directory between entries, lock the 828 * source so that we can safely operate on it. 829 */ 830 if (fdvp != tdvp && fdvp != tvp) { 831 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 832 mp = tdvp->v_mount; 833 error = vfs_busy(mp, 0); 834 if (error != 0) { 835 mp = NULL; 836 goto out; 837 } 838 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 839 fcnp, tcnp); 840 if (error != 0) { 841 vfs_unbusy(mp); 842 return (error); 843 } 844 ASSERT_VOP_ELOCKED(fdvp, 845 "tmpfs_rename: fdvp not locked"); 846 ASSERT_VOP_ELOCKED(tdvp, 847 "tmpfs_rename: tdvp not locked"); 848 if (tvp != NULL) 849 ASSERT_VOP_ELOCKED(tvp, 850 "tmpfs_rename: tvp not locked"); 851 if (fvp == tvp) { 852 error = 0; 853 goto out_locked; 854 } 855 } 856 } 857 858 tmp = VFS_TO_TMPFS(tdvp->v_mount); 859 tdnode = VP_TO_TMPFS_DIR(tdvp); 860 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 861 fdnode = VP_TO_TMPFS_DIR(fdvp); 862 fnode = VP_TO_TMPFS_NODE(fvp); 863 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 864 865 /* 866 * Entry can disappear before we lock fdvp, 867 * also avoid manipulating '.' and '..' entries. 868 */ 869 if (de == NULL) { 870 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 871 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 872 error = EINVAL; 873 else 874 error = ENOENT; 875 goto out_locked; 876 } 877 MPASS(de->td_node == fnode); 878 879 /* 880 * If re-naming a directory to another preexisting directory 881 * ensure that the target directory is empty so that its 882 * removal causes no side effects. 883 * Kern_rename guarantees the destination to be a directory 884 * if the source is one. 885 */ 886 if (tvp != NULL) { 887 MPASS(tnode != NULL); 888 889 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 890 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 891 error = EPERM; 892 goto out_locked; 893 } 894 895 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 896 if (tnode->tn_size > 0) { 897 error = ENOTEMPTY; 898 goto out_locked; 899 } 900 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 901 error = ENOTDIR; 902 goto out_locked; 903 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 904 error = EISDIR; 905 goto out_locked; 906 } else { 907 MPASS(fnode->tn_type != VDIR && 908 tnode->tn_type != VDIR); 909 } 910 } 911 912 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 913 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 914 error = EPERM; 915 goto out_locked; 916 } 917 918 /* 919 * Ensure that we have enough memory to hold the new name, if it 920 * has to be changed. 921 */ 922 if (fcnp->cn_namelen != tcnp->cn_namelen || 923 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 924 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 925 } else 926 newname = NULL; 927 928 /* 929 * If the node is being moved to another directory, we have to do 930 * the move. 931 */ 932 if (fdnode != tdnode) { 933 /* 934 * In case we are moving a directory, we have to adjust its 935 * parent to point to the new parent. 936 */ 937 if (de->td_node->tn_type == VDIR) { 938 struct tmpfs_node *n; 939 940 /* 941 * Ensure the target directory is not a child of the 942 * directory being moved. Otherwise, we'd end up 943 * with stale nodes. 944 */ 945 n = tdnode; 946 /* 947 * TMPFS_LOCK guaranties that no nodes are freed while 948 * traversing the list. Nodes can only be marked as 949 * removed: tn_parent == NULL. 950 */ 951 TMPFS_LOCK(tmp); 952 TMPFS_NODE_LOCK(n); 953 while (n != n->tn_dir.tn_parent) { 954 struct tmpfs_node *parent; 955 956 if (n == fnode) { 957 TMPFS_NODE_UNLOCK(n); 958 TMPFS_UNLOCK(tmp); 959 error = EINVAL; 960 if (newname != NULL) 961 free(newname, M_TMPFSNAME); 962 goto out_locked; 963 } 964 parent = n->tn_dir.tn_parent; 965 TMPFS_NODE_UNLOCK(n); 966 if (parent == NULL) { 967 n = NULL; 968 break; 969 } 970 TMPFS_NODE_LOCK(parent); 971 if (parent->tn_dir.tn_parent == NULL) { 972 TMPFS_NODE_UNLOCK(parent); 973 n = NULL; 974 break; 975 } 976 n = parent; 977 } 978 TMPFS_UNLOCK(tmp); 979 if (n == NULL) { 980 error = EINVAL; 981 if (newname != NULL) 982 free(newname, M_TMPFSNAME); 983 goto out_locked; 984 } 985 TMPFS_NODE_UNLOCK(n); 986 987 /* Adjust the parent pointer. */ 988 TMPFS_VALIDATE_DIR(fnode); 989 TMPFS_NODE_LOCK(de->td_node); 990 de->td_node->tn_dir.tn_parent = tdnode; 991 TMPFS_NODE_UNLOCK(de->td_node); 992 993 /* 994 * As a result of changing the target of the '..' 995 * entry, the link count of the source and target 996 * directories has to be adjusted. 997 */ 998 TMPFS_NODE_LOCK(tdnode); 999 TMPFS_ASSERT_LOCKED(tdnode); 1000 tdnode->tn_links++; 1001 TMPFS_NODE_UNLOCK(tdnode); 1002 1003 TMPFS_NODE_LOCK(fdnode); 1004 TMPFS_ASSERT_LOCKED(fdnode); 1005 fdnode->tn_links--; 1006 TMPFS_NODE_UNLOCK(fdnode); 1007 } 1008 } 1009 1010 /* 1011 * Do the move: just remove the entry from the source directory 1012 * and insert it into the target one. 1013 */ 1014 tmpfs_dir_detach(fdvp, de); 1015 1016 if (fcnp->cn_flags & DOWHITEOUT) 1017 tmpfs_dir_whiteout_add(fdvp, fcnp); 1018 if (tcnp->cn_flags & ISWHITEOUT) 1019 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1020 1021 /* 1022 * If the name has changed, we need to make it effective by changing 1023 * it in the directory entry. 1024 */ 1025 if (newname != NULL) { 1026 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1027 1028 free(de->ud.td_name, M_TMPFSNAME); 1029 de->ud.td_name = newname; 1030 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1031 1032 fnode->tn_status |= TMPFS_NODE_CHANGED; 1033 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1034 } 1035 1036 /* 1037 * If we are overwriting an entry, we have to remove the old one 1038 * from the target directory. 1039 */ 1040 if (tvp != NULL) { 1041 struct tmpfs_dirent *tde; 1042 1043 /* Remove the old entry from the target directory. */ 1044 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1045 tmpfs_dir_detach(tdvp, tde); 1046 1047 /* 1048 * Free the directory entry we just deleted. Note that the 1049 * node referred by it will not be removed until the vnode is 1050 * really reclaimed. 1051 */ 1052 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1053 } 1054 1055 tmpfs_dir_attach(tdvp, de); 1056 1057 if (tmpfs_use_nc(fvp)) { 1058 cache_purge(fvp); 1059 if (tvp != NULL) 1060 cache_purge(tvp); 1061 cache_purge_negative(tdvp); 1062 } 1063 1064 error = 0; 1065 1066 out_locked: 1067 if (fdvp != tdvp && fdvp != tvp) 1068 VOP_UNLOCK(fdvp, 0); 1069 1070 out: 1071 /* 1072 * Release target nodes. 1073 * XXX: I don't understand when tdvp can be the same as tvp, but 1074 * other code takes care of this... 1075 */ 1076 if (tdvp == tvp) 1077 vrele(tdvp); 1078 else 1079 vput(tdvp); 1080 if (tvp != NULL) 1081 vput(tvp); 1082 1083 /* Release source nodes. */ 1084 vrele(fdvp); 1085 vrele(fvp); 1086 1087 if (mp != NULL) 1088 vfs_unbusy(mp); 1089 1090 return (error); 1091 } 1092 1093 static int 1094 tmpfs_mkdir(struct vop_mkdir_args *v) 1095 { 1096 struct vnode *dvp = v->a_dvp; 1097 struct vnode **vpp = v->a_vpp; 1098 struct componentname *cnp = v->a_cnp; 1099 struct vattr *vap = v->a_vap; 1100 1101 MPASS(vap->va_type == VDIR); 1102 1103 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1104 } 1105 1106 static int 1107 tmpfs_rmdir(struct vop_rmdir_args *v) 1108 { 1109 struct vnode *dvp = v->a_dvp; 1110 struct vnode *vp = v->a_vp; 1111 1112 int error; 1113 struct tmpfs_dirent *de; 1114 struct tmpfs_mount *tmp; 1115 struct tmpfs_node *dnode; 1116 struct tmpfs_node *node; 1117 1118 MPASS(VOP_ISLOCKED(dvp)); 1119 MPASS(VOP_ISLOCKED(vp)); 1120 1121 tmp = VFS_TO_TMPFS(dvp->v_mount); 1122 dnode = VP_TO_TMPFS_DIR(dvp); 1123 node = VP_TO_TMPFS_DIR(vp); 1124 1125 /* Directories with more than two entries ('.' and '..') cannot be 1126 * removed. */ 1127 if (node->tn_size > 0) { 1128 error = ENOTEMPTY; 1129 goto out; 1130 } 1131 1132 if ((dnode->tn_flags & APPEND) 1133 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1134 error = EPERM; 1135 goto out; 1136 } 1137 1138 /* This invariant holds only if we are not trying to remove "..". 1139 * We checked for that above so this is safe now. */ 1140 MPASS(node->tn_dir.tn_parent == dnode); 1141 1142 /* Get the directory entry associated with node (vp). This was 1143 * filled by tmpfs_lookup while looking up the entry. */ 1144 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1145 MPASS(TMPFS_DIRENT_MATCHES(de, 1146 v->a_cnp->cn_nameptr, 1147 v->a_cnp->cn_namelen)); 1148 1149 /* Check flags to see if we are allowed to remove the directory. */ 1150 if ((dnode->tn_flags & APPEND) != 0 || 1151 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1152 error = EPERM; 1153 goto out; 1154 } 1155 1156 1157 /* Detach the directory entry from the directory (dnode). */ 1158 tmpfs_dir_detach(dvp, de); 1159 if (v->a_cnp->cn_flags & DOWHITEOUT) 1160 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1161 1162 /* No vnode should be allocated for this entry from this point */ 1163 TMPFS_NODE_LOCK(node); 1164 node->tn_links--; 1165 node->tn_dir.tn_parent = NULL; 1166 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1167 TMPFS_NODE_MODIFIED; 1168 1169 TMPFS_NODE_UNLOCK(node); 1170 1171 TMPFS_NODE_LOCK(dnode); 1172 dnode->tn_links--; 1173 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1174 TMPFS_NODE_MODIFIED; 1175 TMPFS_NODE_UNLOCK(dnode); 1176 1177 if (tmpfs_use_nc(dvp)) { 1178 cache_purge(dvp); 1179 cache_purge(vp); 1180 } 1181 1182 /* Free the directory entry we just deleted. Note that the node 1183 * referred by it will not be removed until the vnode is really 1184 * reclaimed. */ 1185 tmpfs_free_dirent(tmp, de); 1186 1187 /* Release the deleted vnode (will destroy the node, notify 1188 * interested parties and clean it from the cache). */ 1189 1190 dnode->tn_status |= TMPFS_NODE_CHANGED; 1191 tmpfs_update(dvp); 1192 1193 error = 0; 1194 1195 out: 1196 return error; 1197 } 1198 1199 static int 1200 tmpfs_symlink(struct vop_symlink_args *v) 1201 { 1202 struct vnode *dvp = v->a_dvp; 1203 struct vnode **vpp = v->a_vpp; 1204 struct componentname *cnp = v->a_cnp; 1205 struct vattr *vap = v->a_vap; 1206 const char *target = v->a_target; 1207 1208 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1209 MPASS(vap->va_type == VLNK); 1210 #else 1211 vap->va_type = VLNK; 1212 #endif 1213 1214 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1215 } 1216 1217 static int 1218 tmpfs_readdir(struct vop_readdir_args *va) 1219 { 1220 struct vnode *vp; 1221 struct uio *uio; 1222 struct tmpfs_mount *tm; 1223 struct tmpfs_node *node; 1224 u_long **cookies; 1225 int *eofflag, *ncookies; 1226 ssize_t startresid; 1227 int error, maxcookies; 1228 1229 vp = va->a_vp; 1230 uio = va->a_uio; 1231 eofflag = va->a_eofflag; 1232 cookies = va->a_cookies; 1233 ncookies = va->a_ncookies; 1234 1235 /* This operation only makes sense on directory nodes. */ 1236 if (vp->v_type != VDIR) 1237 return ENOTDIR; 1238 1239 maxcookies = 0; 1240 node = VP_TO_TMPFS_DIR(vp); 1241 tm = VFS_TO_TMPFS(vp->v_mount); 1242 1243 startresid = uio->uio_resid; 1244 1245 /* Allocate cookies for NFS and compat modules. */ 1246 if (cookies != NULL && ncookies != NULL) { 1247 maxcookies = howmany(node->tn_size, 1248 sizeof(struct tmpfs_dirent)) + 2; 1249 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1250 M_WAITOK); 1251 *ncookies = 0; 1252 } 1253 1254 if (cookies == NULL) 1255 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL); 1256 else 1257 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies, 1258 ncookies); 1259 1260 /* Buffer was filled without hitting EOF. */ 1261 if (error == EJUSTRETURN) 1262 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1263 1264 if (error != 0 && cookies != NULL && ncookies != NULL) { 1265 free(*cookies, M_TEMP); 1266 *cookies = NULL; 1267 *ncookies = 0; 1268 } 1269 1270 if (eofflag != NULL) 1271 *eofflag = 1272 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1273 1274 return error; 1275 } 1276 1277 static int 1278 tmpfs_readlink(struct vop_readlink_args *v) 1279 { 1280 struct vnode *vp = v->a_vp; 1281 struct uio *uio = v->a_uio; 1282 1283 int error; 1284 struct tmpfs_node *node; 1285 1286 MPASS(uio->uio_offset == 0); 1287 MPASS(vp->v_type == VLNK); 1288 1289 node = VP_TO_TMPFS_NODE(vp); 1290 1291 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1292 uio); 1293 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 1294 1295 return (error); 1296 } 1297 1298 static int 1299 tmpfs_inactive(struct vop_inactive_args *v) 1300 { 1301 struct vnode *vp; 1302 struct tmpfs_node *node; 1303 1304 vp = v->a_vp; 1305 node = VP_TO_TMPFS_NODE(vp); 1306 if (node->tn_links == 0) 1307 vrecycle(vp); 1308 else 1309 tmpfs_check_mtime(vp); 1310 return (0); 1311 } 1312 1313 static int 1314 tmpfs_need_inactive(struct vop_need_inactive_args *ap) 1315 { 1316 struct vnode *vp; 1317 struct tmpfs_node *node; 1318 struct vm_object *obj; 1319 1320 vp = ap->a_vp; 1321 node = VP_TO_TMPFS_NODE(vp); 1322 if (node->tn_links == 0) 1323 goto need; 1324 if (vp->v_type == VREG) { 1325 obj = vp->v_object; 1326 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) 1327 goto need; 1328 } 1329 return (0); 1330 need: 1331 return (1); 1332 } 1333 1334 int 1335 tmpfs_reclaim(struct vop_reclaim_args *v) 1336 { 1337 struct vnode *vp = v->a_vp; 1338 1339 struct tmpfs_mount *tmp; 1340 struct tmpfs_node *node; 1341 1342 node = VP_TO_TMPFS_NODE(vp); 1343 tmp = VFS_TO_TMPFS(vp->v_mount); 1344 1345 if (vp->v_type == VREG) 1346 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1347 vp->v_object = NULL; 1348 if (tmpfs_use_nc(vp)) 1349 cache_purge(vp); 1350 1351 TMPFS_NODE_LOCK(node); 1352 tmpfs_free_vp(vp); 1353 1354 /* If the node referenced by this vnode was deleted by the user, 1355 * we must free its associated data structures (now that the vnode 1356 * is being reclaimed). */ 1357 if (node->tn_links == 0 && 1358 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1359 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1360 TMPFS_NODE_UNLOCK(node); 1361 tmpfs_free_node(tmp, node); 1362 } else 1363 TMPFS_NODE_UNLOCK(node); 1364 1365 MPASS(vp->v_data == NULL); 1366 return 0; 1367 } 1368 1369 int 1370 tmpfs_print(struct vop_print_args *v) 1371 { 1372 struct vnode *vp = v->a_vp; 1373 1374 struct tmpfs_node *node; 1375 1376 node = VP_TO_TMPFS_NODE(vp); 1377 1378 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1379 node, node->tn_flags, (uintmax_t)node->tn_links); 1380 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1381 node->tn_mode, node->tn_uid, node->tn_gid, 1382 (intmax_t)node->tn_size, node->tn_status); 1383 1384 if (vp->v_type == VFIFO) 1385 fifo_printinfo(vp); 1386 1387 printf("\n"); 1388 1389 return 0; 1390 } 1391 1392 int 1393 tmpfs_pathconf(struct vop_pathconf_args *v) 1394 { 1395 struct vnode *vp = v->a_vp; 1396 int name = v->a_name; 1397 long *retval = v->a_retval; 1398 1399 int error; 1400 1401 error = 0; 1402 1403 switch (name) { 1404 case _PC_LINK_MAX: 1405 *retval = TMPFS_LINK_MAX; 1406 break; 1407 1408 case _PC_NAME_MAX: 1409 *retval = NAME_MAX; 1410 break; 1411 1412 case _PC_PIPE_BUF: 1413 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1414 *retval = PIPE_BUF; 1415 else 1416 error = EINVAL; 1417 break; 1418 1419 case _PC_CHOWN_RESTRICTED: 1420 *retval = 1; 1421 break; 1422 1423 case _PC_NO_TRUNC: 1424 *retval = 1; 1425 break; 1426 1427 case _PC_SYNC_IO: 1428 *retval = 1; 1429 break; 1430 1431 case _PC_FILESIZEBITS: 1432 *retval = 64; 1433 break; 1434 1435 default: 1436 error = vop_stdpathconf(v); 1437 } 1438 1439 return error; 1440 } 1441 1442 static int 1443 tmpfs_vptofh(struct vop_vptofh_args *ap) 1444 { 1445 struct tmpfs_fid *tfhp; 1446 struct tmpfs_node *node; 1447 1448 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1449 node = VP_TO_TMPFS_NODE(ap->a_vp); 1450 1451 tfhp->tf_len = sizeof(struct tmpfs_fid); 1452 tfhp->tf_id = node->tn_id; 1453 tfhp->tf_gen = node->tn_gen; 1454 1455 return (0); 1456 } 1457 1458 static int 1459 tmpfs_whiteout(struct vop_whiteout_args *ap) 1460 { 1461 struct vnode *dvp = ap->a_dvp; 1462 struct componentname *cnp = ap->a_cnp; 1463 struct tmpfs_dirent *de; 1464 1465 switch (ap->a_flags) { 1466 case LOOKUP: 1467 return (0); 1468 case CREATE: 1469 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1470 if (de != NULL) 1471 return (de->td_node == NULL ? 0 : EEXIST); 1472 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1473 case DELETE: 1474 tmpfs_dir_whiteout_remove(dvp, cnp); 1475 return (0); 1476 default: 1477 panic("tmpfs_whiteout: unknown op"); 1478 } 1479 } 1480 1481 static int 1482 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1483 struct tmpfs_dirent **pde) 1484 { 1485 struct tmpfs_dir_cursor dc; 1486 struct tmpfs_dirent *de; 1487 1488 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1489 de = tmpfs_dir_next(tnp, &dc)) { 1490 if (de->td_node == tn) { 1491 *pde = de; 1492 return (0); 1493 } 1494 } 1495 return (ENOENT); 1496 } 1497 1498 static int 1499 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1500 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1501 { 1502 struct tmpfs_dirent *de; 1503 int error, i; 1504 1505 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1506 dvp); 1507 if (error != 0) 1508 return (error); 1509 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1510 if (error == 0) { 1511 i = *buflen; 1512 i -= de->td_namelen; 1513 if (i < 0) { 1514 error = ENOMEM; 1515 } else { 1516 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1517 *buflen = i; 1518 } 1519 } 1520 if (error == 0) { 1521 if (vp != *dvp) 1522 VOP_UNLOCK(*dvp, 0); 1523 } else { 1524 if (vp != *dvp) 1525 vput(*dvp); 1526 else 1527 vrele(vp); 1528 } 1529 return (error); 1530 } 1531 1532 static int 1533 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1534 { 1535 struct vnode *vp, **dvp; 1536 struct tmpfs_node *tn, *tnp, *tnp1; 1537 struct tmpfs_dirent *de; 1538 struct tmpfs_mount *tm; 1539 char *buf; 1540 int *buflen; 1541 int error; 1542 1543 vp = ap->a_vp; 1544 dvp = ap->a_vpp; 1545 buf = ap->a_buf; 1546 buflen = ap->a_buflen; 1547 1548 tm = VFS_TO_TMPFS(vp->v_mount); 1549 tn = VP_TO_TMPFS_NODE(vp); 1550 if (tn->tn_type == VDIR) { 1551 tnp = tn->tn_dir.tn_parent; 1552 if (tnp == NULL) 1553 return (ENOENT); 1554 tmpfs_ref_node(tnp); 1555 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1556 buflen, dvp); 1557 tmpfs_free_node(tm, tnp); 1558 return (error); 1559 } 1560 restart: 1561 TMPFS_LOCK(tm); 1562 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1563 if (tnp->tn_type != VDIR) 1564 continue; 1565 TMPFS_NODE_LOCK(tnp); 1566 tmpfs_ref_node_locked(tnp); 1567 1568 /* 1569 * tn_vnode cannot be instantiated while we hold the 1570 * node lock, so the directory cannot be changed while 1571 * we iterate over it. Do this to avoid instantiating 1572 * vnode for directories which cannot point to our 1573 * node. 1574 */ 1575 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1576 &de) : 0; 1577 1578 if (error == 0) { 1579 TMPFS_NODE_UNLOCK(tnp); 1580 TMPFS_UNLOCK(tm); 1581 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1582 dvp); 1583 if (error == 0) { 1584 tmpfs_free_node(tm, tnp); 1585 return (0); 1586 } 1587 if ((vp->v_iflag & VI_DOOMED) != 0) { 1588 tmpfs_free_node(tm, tnp); 1589 return (ENOENT); 1590 } 1591 TMPFS_LOCK(tm); 1592 TMPFS_NODE_LOCK(tnp); 1593 } 1594 if (tmpfs_free_node_locked(tm, tnp, false)) { 1595 goto restart; 1596 } else { 1597 KASSERT(tnp->tn_refcount > 0, 1598 ("node %p refcount zero", tnp)); 1599 tnp1 = LIST_NEXT(tnp, tn_entries); 1600 TMPFS_NODE_UNLOCK(tnp); 1601 } 1602 } 1603 TMPFS_UNLOCK(tm); 1604 return (ENOENT); 1605 } 1606 1607 /* 1608 * Vnode operations vector used for files stored in a tmpfs file system. 1609 */ 1610 struct vop_vector tmpfs_vnodeop_entries = { 1611 .vop_default = &default_vnodeops, 1612 .vop_lookup = vfs_cache_lookup, 1613 .vop_cachedlookup = tmpfs_cached_lookup, 1614 .vop_create = tmpfs_create, 1615 .vop_mknod = tmpfs_mknod, 1616 .vop_open = tmpfs_open, 1617 .vop_close = tmpfs_close, 1618 .vop_access = tmpfs_access, 1619 .vop_getattr = tmpfs_getattr, 1620 .vop_setattr = tmpfs_setattr, 1621 .vop_read = tmpfs_read, 1622 .vop_write = tmpfs_write, 1623 .vop_fsync = tmpfs_fsync, 1624 .vop_remove = tmpfs_remove, 1625 .vop_link = tmpfs_link, 1626 .vop_rename = tmpfs_rename, 1627 .vop_mkdir = tmpfs_mkdir, 1628 .vop_rmdir = tmpfs_rmdir, 1629 .vop_symlink = tmpfs_symlink, 1630 .vop_readdir = tmpfs_readdir, 1631 .vop_readlink = tmpfs_readlink, 1632 .vop_inactive = tmpfs_inactive, 1633 .vop_need_inactive = tmpfs_need_inactive, 1634 .vop_reclaim = tmpfs_reclaim, 1635 .vop_print = tmpfs_print, 1636 .vop_pathconf = tmpfs_pathconf, 1637 .vop_vptofh = tmpfs_vptofh, 1638 .vop_whiteout = tmpfs_whiteout, 1639 .vop_bmap = VOP_EOPNOTSUPP, 1640 .vop_vptocnp = tmpfs_vptocnp, 1641 }; 1642 1643 /* 1644 * Same vector for mounts which do not use namecache. 1645 */ 1646 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1647 .vop_default = &tmpfs_vnodeop_entries, 1648 .vop_lookup = tmpfs_lookup, 1649 }; 1650