1 /* $NetBSD: tmpfs_vnops.c,v 1.147 2021/07/18 23:57:14 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007, 2020 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 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.147 2021/07/18 23:57:14 dholland Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/stat.h> 47 #include <sys/uio.h> 48 #include <sys/unistd.h> 49 #include <sys/vnode.h> 50 #include <sys/lockf.h> 51 #include <sys/kauth.h> 52 #include <sys/atomic.h> 53 54 #include <uvm/uvm_object.h> 55 56 #include <miscfs/fifofs/fifo.h> 57 #include <miscfs/genfs/genfs.h> 58 #include <fs/tmpfs/tmpfs_vnops.h> 59 #include <fs/tmpfs/tmpfs.h> 60 61 /* 62 * vnode operations vector used for files stored in a tmpfs file system. 63 */ 64 int (**tmpfs_vnodeop_p)(void *); 65 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 66 { &vop_default_desc, vn_default_error }, 67 { &vop_parsepath_desc, genfs_parsepath }, 68 { &vop_lookup_desc, tmpfs_lookup }, 69 { &vop_create_desc, tmpfs_create }, 70 { &vop_mknod_desc, tmpfs_mknod }, 71 { &vop_open_desc, tmpfs_open }, 72 { &vop_close_desc, tmpfs_close }, 73 { &vop_access_desc, tmpfs_access }, 74 { &vop_accessx_desc, genfs_accessx }, 75 { &vop_getattr_desc, tmpfs_getattr }, 76 { &vop_setattr_desc, tmpfs_setattr }, 77 { &vop_read_desc, tmpfs_read }, 78 { &vop_write_desc, tmpfs_write }, 79 { &vop_fallocate_desc, genfs_eopnotsupp }, 80 { &vop_fdiscard_desc, genfs_eopnotsupp }, 81 { &vop_ioctl_desc, genfs_enoioctl }, 82 { &vop_fcntl_desc, genfs_fcntl }, 83 { &vop_poll_desc, genfs_poll }, 84 { &vop_kqfilter_desc, genfs_kqfilter }, 85 { &vop_revoke_desc, genfs_revoke }, 86 { &vop_mmap_desc, genfs_mmap }, 87 { &vop_fsync_desc, tmpfs_fsync }, 88 { &vop_seek_desc, genfs_seek }, 89 { &vop_remove_desc, tmpfs_remove }, 90 { &vop_link_desc, tmpfs_link }, 91 { &vop_rename_desc, tmpfs_rename }, 92 { &vop_mkdir_desc, tmpfs_mkdir }, 93 { &vop_rmdir_desc, tmpfs_rmdir }, 94 { &vop_symlink_desc, tmpfs_symlink }, 95 { &vop_readdir_desc, tmpfs_readdir }, 96 { &vop_readlink_desc, tmpfs_readlink }, 97 { &vop_abortop_desc, genfs_abortop }, 98 { &vop_inactive_desc, tmpfs_inactive }, 99 { &vop_reclaim_desc, tmpfs_reclaim }, 100 { &vop_lock_desc, genfs_lock }, 101 { &vop_unlock_desc, genfs_unlock }, 102 { &vop_bmap_desc, genfs_eopnotsupp }, 103 { &vop_strategy_desc, genfs_eopnotsupp }, 104 { &vop_print_desc, tmpfs_print }, 105 { &vop_pathconf_desc, tmpfs_pathconf }, 106 { &vop_islocked_desc, genfs_islocked }, 107 { &vop_advlock_desc, tmpfs_advlock }, 108 { &vop_bwrite_desc, genfs_nullop }, 109 { &vop_getpages_desc, tmpfs_getpages }, 110 { &vop_putpages_desc, tmpfs_putpages }, 111 { &vop_whiteout_desc, tmpfs_whiteout }, 112 { NULL, NULL } 113 }; 114 115 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = { 116 &tmpfs_vnodeop_p, tmpfs_vnodeop_entries 117 }; 118 119 /* 120 * tmpfs_lookup: path name traversal routine. 121 * 122 * Arguments: dvp (directory being searched), vpp (result), 123 * cnp (component name - path). 124 * 125 * => Caller holds a reference and lock on dvp. 126 * => We return looked-up vnode (vpp) locked, with a reference held. 127 */ 128 int 129 tmpfs_lookup(void *v) 130 { 131 struct vop_lookup_v2_args /* { 132 struct vnode *a_dvp; 133 struct vnode **a_vpp; 134 struct componentname *a_cnp; 135 } */ *ap = v; 136 vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; 137 struct componentname *cnp = ap->a_cnp; 138 const bool lastcn = (cnp->cn_flags & ISLASTCN) != 0; 139 tmpfs_node_t *dnode, *tnode; 140 tmpfs_dirent_t *de; 141 int cachefound, iswhiteout; 142 int error; 143 144 KASSERT(VOP_ISLOCKED(dvp)); 145 146 dnode = VP_TO_TMPFS_DIR(dvp); 147 *vpp = NULL; 148 149 /* Check accessibility of directory. */ 150 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 151 if (error) { 152 goto out; 153 } 154 155 /* 156 * If requesting the last path component on a read-only file system 157 * with a write operation, deny it. 158 */ 159 if (lastcn && (dvp->v_mount->mnt_flag & MNT_RDONLY) != 0 && 160 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 161 error = EROFS; 162 goto out; 163 } 164 165 /* 166 * Avoid doing a linear scan of the directory if the requested 167 * directory/name couple is already in the cache. 168 */ 169 cachefound = cache_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 170 cnp->cn_nameiop, cnp->cn_flags, 171 &iswhiteout, vpp); 172 if (iswhiteout) { 173 cnp->cn_flags |= ISWHITEOUT; 174 } 175 if (cachefound && *vpp == NULLVP) { 176 /* Negative cache hit. */ 177 error = ENOENT; 178 goto out; 179 } else if (cachefound) { 180 error = 0; 181 goto out; 182 } 183 184 /* 185 * Treat an unlinked directory as empty (no "." or "..") 186 */ 187 if (dnode->tn_links == 0) { 188 KASSERT(dnode->tn_size == 0); 189 error = ENOENT; 190 goto out; 191 } 192 193 if (cnp->cn_flags & ISDOTDOT) { 194 tmpfs_node_t *pnode; 195 196 /* 197 * Lookup of ".." case. 198 */ 199 if (lastcn && cnp->cn_nameiop == RENAME) { 200 error = EINVAL; 201 goto out; 202 } 203 KASSERT(dnode->tn_type == VDIR); 204 pnode = dnode->tn_spec.tn_dir.tn_parent; 205 if (pnode == NULL) { 206 error = ENOENT; 207 goto done; 208 } 209 210 error = vcache_get(dvp->v_mount, &pnode, sizeof(pnode), vpp); 211 goto done; 212 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 213 /* 214 * Lookup of "." case. 215 */ 216 if (lastcn && cnp->cn_nameiop == RENAME) { 217 error = EISDIR; 218 goto out; 219 } 220 vref(dvp); 221 *vpp = dvp; 222 error = 0; 223 goto done; 224 } 225 226 /* 227 * Other lookup cases: perform directory scan. 228 */ 229 de = tmpfs_dir_lookup(dnode, cnp); 230 if (de == NULL || de->td_node == TMPFS_NODE_WHITEOUT) { 231 /* 232 * The entry was not found in the directory. This is valid 233 * if we are creating or renaming an entry and are working 234 * on the last component of the path name. 235 */ 236 if (lastcn && (cnp->cn_nameiop == CREATE || 237 cnp->cn_nameiop == RENAME)) { 238 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 239 if (error) { 240 goto out; 241 } 242 error = EJUSTRETURN; 243 } else { 244 error = ENOENT; 245 } 246 if (de) { 247 KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); 248 cnp->cn_flags |= ISWHITEOUT; 249 } 250 goto done; 251 } 252 253 tnode = de->td_node; 254 255 /* 256 * If it is not the last path component and found a non-directory 257 * or non-link entry (which may itself be pointing to a directory), 258 * raise an error. 259 */ 260 if (!lastcn && tnode->tn_type != VDIR && tnode->tn_type != VLNK) { 261 error = ENOTDIR; 262 goto out; 263 } 264 265 /* Check the permissions. */ 266 if (lastcn && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 267 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 268 if (error) 269 goto out; 270 271 if ((dnode->tn_mode & S_ISTXT) != 0) { 272 error = kauth_authorize_vnode(cnp->cn_cred, 273 KAUTH_VNODE_DELETE, tnode->tn_vnode, 274 dnode->tn_vnode, genfs_can_sticky(dvp, cnp->cn_cred, 275 dnode->tn_uid, tnode->tn_uid)); 276 if (error) { 277 error = EPERM; 278 goto out; 279 } 280 } 281 } 282 283 /* Get a vnode for the matching entry. */ 284 error = vcache_get(dvp->v_mount, &tnode, sizeof(tnode), vpp); 285 done: 286 /* 287 * Cache the result, unless request was for creation (as it does 288 * not improve the performance). 289 */ 290 if (cnp->cn_nameiop != CREATE) { 291 cache_enter(dvp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, 292 cnp->cn_flags); 293 } 294 out: 295 KASSERT(VOP_ISLOCKED(dvp)); 296 297 return error; 298 } 299 300 int 301 tmpfs_create(void *v) 302 { 303 struct vop_create_v3_args /* { 304 struct vnode *a_dvp; 305 struct vnode **a_vpp; 306 struct componentname *a_cnp; 307 struct vattr *a_vap; 308 } */ *ap = v; 309 vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; 310 struct componentname *cnp = ap->a_cnp; 311 struct vattr *vap = ap->a_vap; 312 313 KASSERT(VOP_ISLOCKED(dvp)); 314 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 315 return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); 316 } 317 318 int 319 tmpfs_mknod(void *v) 320 { 321 struct vop_mknod_v3_args /* { 322 struct vnode *a_dvp; 323 struct vnode **a_vpp; 324 struct componentname *a_cnp; 325 struct vattr *a_vap; 326 } */ *ap = v; 327 vnode_t *dvp = ap->a_dvp, **vpp = ap->a_vpp; 328 struct componentname *cnp = ap->a_cnp; 329 struct vattr *vap = ap->a_vap; 330 enum vtype vt = vap->va_type; 331 332 if (vt != VBLK && vt != VCHR && vt != VFIFO) { 333 *vpp = NULL; 334 return EINVAL; 335 } 336 return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); 337 } 338 339 int 340 tmpfs_open(void *v) 341 { 342 struct vop_open_args /* { 343 struct vnode *a_vp; 344 int a_mode; 345 kauth_cred_t a_cred; 346 } */ *ap = v; 347 vnode_t *vp = ap->a_vp; 348 mode_t mode = ap->a_mode; 349 tmpfs_node_t *node; 350 351 KASSERT(VOP_ISLOCKED(vp)); 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 /* If the file is marked append-only, deny write requests. */ 356 if ((node->tn_flags & APPEND) != 0 && 357 (mode & (FWRITE | O_APPEND)) == FWRITE) { 358 return EPERM; 359 } 360 return 0; 361 } 362 363 int 364 tmpfs_close(void *v) 365 { 366 struct vop_close_args /* { 367 struct vnode *a_vp; 368 int a_fflag; 369 kauth_cred_t a_cred; 370 } */ *ap = v; 371 vnode_t *vp __diagused = ap->a_vp; 372 373 KASSERT(VOP_ISLOCKED(vp)); 374 return 0; 375 } 376 377 int 378 tmpfs_access(void *v) 379 { 380 struct vop_access_args /* { 381 struct vnode *a_vp; 382 accmode_t a_accmode; 383 kauth_cred_t a_cred; 384 } */ *ap = v; 385 vnode_t *vp = ap->a_vp; 386 accmode_t accmode = ap->a_accmode; 387 kauth_cred_t cred = ap->a_cred; 388 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 389 const bool writing = (accmode & VWRITE) != 0; 390 391 KASSERT(VOP_ISLOCKED(vp)); 392 393 /* Possible? */ 394 switch (vp->v_type) { 395 case VDIR: 396 case VLNK: 397 case VREG: 398 if (writing && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 399 return EROFS; 400 } 401 break; 402 case VBLK: 403 case VCHR: 404 case VSOCK: 405 case VFIFO: 406 break; 407 default: 408 return EINVAL; 409 } 410 if (writing && (node->tn_flags & IMMUTABLE) != 0) { 411 return EPERM; 412 } 413 414 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode, 415 vp->v_type, node->tn_mode), vp, NULL, genfs_can_access(vp, cred, 416 node->tn_uid, node->tn_gid, node->tn_mode, NULL, accmode)); 417 } 418 419 int 420 tmpfs_getattr(void *v) 421 { 422 struct vop_getattr_args /* { 423 struct vnode *a_vp; 424 struct vattr *a_vap; 425 kauth_cred_t a_cred; 426 } */ *ap = v; 427 vnode_t *vp = ap->a_vp; 428 struct vattr *vap = ap->a_vap; 429 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 430 431 vattr_null(vap); 432 433 vap->va_type = vp->v_type; 434 vap->va_mode = node->tn_mode; 435 vap->va_nlink = node->tn_links; 436 vap->va_uid = node->tn_uid; 437 vap->va_gid = node->tn_gid; 438 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 439 vap->va_fileid = node->tn_id; 440 vap->va_size = node->tn_size; 441 vap->va_blocksize = PAGE_SIZE; 442 vap->va_gen = TMPFS_NODE_GEN(node); 443 vap->va_flags = node->tn_flags; 444 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 445 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 446 vap->va_bytes = round_page(node->tn_size); 447 vap->va_filerev = VNOVAL; 448 vap->va_vaflags = 0; 449 vap->va_spare = VNOVAL; /* XXX */ 450 451 mutex_enter(&node->tn_timelock); 452 tmpfs_update_locked(vp, 0); 453 vap->va_atime = node->tn_atime; 454 vap->va_mtime = node->tn_mtime; 455 vap->va_ctime = node->tn_ctime; 456 vap->va_birthtime = node->tn_birthtime; 457 mutex_exit(&node->tn_timelock); 458 459 return 0; 460 } 461 462 int 463 tmpfs_setattr(void *v) 464 { 465 struct vop_setattr_args /* { 466 struct vnode *a_vp; 467 struct vattr *a_vap; 468 kauth_cred_t a_cred; 469 } */ *ap = v; 470 vnode_t *vp = ap->a_vp; 471 struct vattr *vap = ap->a_vap; 472 kauth_cred_t cred = ap->a_cred; 473 lwp_t *l = curlwp; 474 int error = 0; 475 476 KASSERT(VOP_ISLOCKED(vp)); 477 478 /* Abort if any unsettable attribute is given. */ 479 if (vap->va_type != VNON || vap->va_nlink != VNOVAL || 480 vap->va_fsid != VNOVAL || vap->va_fileid != VNOVAL || 481 vap->va_blocksize != VNOVAL || vap->va_ctime.tv_sec != VNOVAL || 482 vap->va_gen != VNOVAL || vap->va_rdev != VNOVAL || 483 vap->va_bytes != VNOVAL) { 484 return EINVAL; 485 } 486 487 if (error == 0 && vap->va_flags != VNOVAL) 488 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 489 490 if (error == 0 && vap->va_size != VNOVAL) 491 error = tmpfs_chsize(vp, vap->va_size, cred, l); 492 493 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 494 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 495 496 if (error == 0 && vap->va_mode != VNOVAL) 497 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 498 499 const bool chsometime = 500 vap->va_atime.tv_sec != VNOVAL || 501 vap->va_mtime.tv_sec != VNOVAL || 502 vap->va_birthtime.tv_sec != VNOVAL; 503 if (error == 0 && chsometime) { 504 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 505 &vap->va_birthtime, vap->va_vaflags, cred, l); 506 } 507 return error; 508 } 509 510 int 511 tmpfs_read(void *v) 512 { 513 struct vop_read_args /* { 514 struct vnode *a_vp; 515 struct uio *a_uio; 516 int a_ioflag; 517 kauth_cred_t a_cred; 518 } */ *ap = v; 519 vnode_t *vp = ap->a_vp; 520 struct uio *uio = ap->a_uio; 521 const int ioflag = ap->a_ioflag; 522 tmpfs_node_t *node; 523 struct uvm_object *uobj; 524 int error; 525 526 KASSERT(VOP_ISLOCKED(vp)); 527 528 if (vp->v_type == VDIR) { 529 return EISDIR; 530 } 531 if (uio->uio_offset < 0 || vp->v_type != VREG) { 532 return EINVAL; 533 } 534 535 /* Note: reading zero bytes should not update atime. */ 536 if (uio->uio_resid == 0) { 537 return 0; 538 } 539 540 node = VP_TO_TMPFS_NODE(vp); 541 uobj = node->tn_spec.tn_reg.tn_aobj; 542 error = 0; 543 544 while (error == 0 && uio->uio_resid > 0) { 545 vsize_t len; 546 547 if (node->tn_size <= uio->uio_offset) { 548 break; 549 } 550 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 551 if (len == 0) { 552 break; 553 } 554 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 555 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 556 } 557 558 tmpfs_update(vp, TMPFS_UPDATE_ATIME); 559 return error; 560 } 561 562 int 563 tmpfs_write(void *v) 564 { 565 struct vop_write_args /* { 566 struct vnode *a_vp; 567 struct uio *a_uio; 568 int a_ioflag; 569 kauth_cred_t a_cred; 570 } */ *ap = v; 571 vnode_t *vp = ap->a_vp; 572 struct uio *uio = ap->a_uio; 573 const int ioflag = ap->a_ioflag; 574 tmpfs_node_t *node; 575 struct uvm_object *uobj; 576 off_t oldsize; 577 int error, ubc_flags; 578 579 KASSERT(VOP_ISLOCKED(vp)); 580 581 node = VP_TO_TMPFS_NODE(vp); 582 oldsize = node->tn_size; 583 584 if ((vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 585 error = EROFS; 586 goto out; 587 } 588 589 if (uio->uio_offset < 0 || vp->v_type != VREG) { 590 error = EINVAL; 591 goto out; 592 } 593 if (uio->uio_resid == 0) { 594 error = 0; 595 goto out; 596 } 597 if (ioflag & IO_APPEND) { 598 uio->uio_offset = node->tn_size; 599 } 600 601 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 602 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 603 if (error) 604 goto out; 605 } 606 607 /* 608 * If we're extending the file and have data to write that would 609 * not leave an un-zeroed hole, we can avoid fault processing and 610 * zeroing of pages on allocation. 611 * 612 * Don't do this if the file is mapped and we need to touch an 613 * existing page, because writing a mapping of the file into itself 614 * could cause a deadlock on PG_BUSY. 615 * 616 * New pages will not become visible until finished here (because 617 * of PG_BUSY and the vnode lock). 618 */ 619 ubc_flags = UBC_WRITE | UBC_VNODE_FLAGS(vp); 620 #if 0 621 /* 622 * XXX disable use of UBC_FAULTBUSY for now, this check is insufficient 623 * because it does not zero uninitialized parts of pages in all of 624 * the cases where zeroing is needed. 625 */ 626 if (uio->uio_offset >= oldsize && 627 ((uio->uio_offset & (PAGE_SIZE - 1)) == 0 || 628 ((vp->v_vflag & VV_MAPPED) == 0 && 629 trunc_page(uio->uio_offset) == trunc_page(oldsize)))) { 630 ubc_flags |= UBC_FAULTBUSY; 631 } 632 #endif 633 634 uobj = node->tn_spec.tn_reg.tn_aobj; 635 error = 0; 636 while (error == 0 && uio->uio_resid > 0) { 637 vsize_t len; 638 639 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 640 if (len == 0) { 641 break; 642 } 643 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 644 ubc_flags); 645 } 646 if (error) { 647 (void)tmpfs_reg_resize(vp, oldsize); 648 } 649 650 tmpfs_update(vp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 651 VN_KNOTE(vp, NOTE_WRITE); 652 out: 653 if (error) { 654 KASSERT(oldsize == node->tn_size); 655 } else { 656 KASSERT(uio->uio_resid == 0); 657 } 658 return error; 659 } 660 661 int 662 tmpfs_fsync(void *v) 663 { 664 struct vop_fsync_args /* { 665 struct vnode *a_vp; 666 kauth_cred_t a_cred; 667 int a_flags; 668 off_t a_offlo; 669 off_t a_offhi; 670 struct lwp *a_l; 671 } */ *ap = v; 672 vnode_t *vp __diagused = ap->a_vp; 673 674 /* Nothing to do. Should be up to date. */ 675 KASSERT(VOP_ISLOCKED(vp)); 676 return 0; 677 } 678 679 /* 680 * tmpfs_remove: unlink a file. 681 * 682 * => Both directory (dvp) and file (vp) are locked. 683 * => We unlock and drop the reference on both. 684 */ 685 int 686 tmpfs_remove(void *v) 687 { 688 struct vop_remove_v2_args /* { 689 struct vnode *a_dvp; 690 struct vnode *a_vp; 691 struct componentname *a_cnp; 692 } */ *ap = v; 693 vnode_t *dvp = ap->a_dvp, *vp = ap->a_vp; 694 tmpfs_node_t *dnode, *node; 695 tmpfs_dirent_t *de; 696 int error, tflags; 697 698 KASSERT(VOP_ISLOCKED(dvp)); 699 KASSERT(VOP_ISLOCKED(vp)); 700 701 if (vp->v_type == VDIR) { 702 error = EPERM; 703 goto out; 704 } 705 dnode = VP_TO_TMPFS_DIR(dvp); 706 node = VP_TO_TMPFS_NODE(vp); 707 708 /* 709 * Files marked as immutable or append-only cannot be deleted. 710 * Likewise, files residing on directories marked as append-only 711 * cannot be deleted. 712 */ 713 if (node->tn_flags & (IMMUTABLE | APPEND)) { 714 error = EPERM; 715 goto out; 716 } 717 if (dnode->tn_flags & APPEND) { 718 error = EPERM; 719 goto out; 720 } 721 722 /* Lookup the directory entry (check the cached hint first). */ 723 de = tmpfs_dir_cached(node); 724 if (de == NULL) { 725 struct componentname *cnp = ap->a_cnp; 726 de = tmpfs_dir_lookup(dnode, cnp); 727 } 728 KASSERT(de && de->td_node == node); 729 730 /* 731 * Remove the entry from the directory (drops the link count) and 732 * destroy it or replace with a whiteout. 733 * 734 * Note: the inode referred by it will not be destroyed until the 735 * vnode is reclaimed/recycled. 736 */ 737 738 tmpfs_dir_detach(dnode, de); 739 740 if (ap->a_cnp->cn_flags & DOWHITEOUT) 741 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 742 else 743 tmpfs_free_dirent(VFS_TO_TMPFS(vp->v_mount), de); 744 745 tflags = TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME; 746 if (node->tn_links > 0) { 747 /* We removed a hard link. */ 748 tflags |= TMPFS_UPDATE_CTIME; 749 } 750 tmpfs_update(dvp, tflags); 751 error = 0; 752 out: 753 /* Drop the reference and unlock the node. */ 754 if (dvp == vp) { 755 vrele(vp); 756 } else { 757 vput(vp); 758 } 759 return error; 760 } 761 762 /* 763 * tmpfs_link: create a hard link. 764 */ 765 int 766 tmpfs_link(void *v) 767 { 768 struct vop_link_v2_args /* { 769 struct vnode *a_dvp; 770 struct vnode *a_vp; 771 struct componentname *a_cnp; 772 } */ *ap = v; 773 vnode_t *dvp = ap->a_dvp; 774 vnode_t *vp = ap->a_vp; 775 struct componentname *cnp = ap->a_cnp; 776 tmpfs_node_t *dnode, *node; 777 tmpfs_dirent_t *de; 778 int error; 779 780 KASSERT(dvp != vp); 781 KASSERT(VOP_ISLOCKED(dvp)); 782 KASSERT(vp->v_type != VDIR); 783 KASSERT(dvp->v_mount == vp->v_mount); 784 785 dnode = VP_TO_TMPFS_DIR(dvp); 786 node = VP_TO_TMPFS_NODE(vp); 787 788 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 789 790 /* Check for maximum number of links limit. */ 791 if (node->tn_links == LINK_MAX) { 792 error = EMLINK; 793 goto out; 794 } 795 KASSERT(node->tn_links < LINK_MAX); 796 797 /* We cannot create links of files marked immutable or append-only. */ 798 if (node->tn_flags & (IMMUTABLE | APPEND)) { 799 error = EPERM; 800 goto out; 801 } 802 803 /* Allocate a new directory entry to represent the inode. */ 804 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), 805 cnp->cn_nameptr, cnp->cn_namelen, &de); 806 if (error) { 807 goto out; 808 } 809 810 /* 811 * Insert the entry into the directory. 812 * It will increase the inode link count. 813 */ 814 tmpfs_dir_attach(dnode, de, node); 815 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 816 817 /* Update the timestamps and trigger the event. */ 818 if (node->tn_vnode) { 819 VN_KNOTE(node->tn_vnode, NOTE_LINK); 820 } 821 tmpfs_update(vp, TMPFS_UPDATE_CTIME); 822 error = 0; 823 out: 824 VOP_UNLOCK(vp); 825 return error; 826 } 827 828 int 829 tmpfs_mkdir(void *v) 830 { 831 struct vop_mkdir_v3_args /* { 832 struct vnode *a_dvp; 833 struct vnode **a_vpp; 834 struct componentname *a_cnp; 835 struct vattr *a_vap; 836 } */ *ap = v; 837 vnode_t *dvp = ap->a_dvp; 838 vnode_t **vpp = ap->a_vpp; 839 struct componentname *cnp = ap->a_cnp; 840 struct vattr *vap = ap->a_vap; 841 842 KASSERT(vap->va_type == VDIR); 843 return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); 844 } 845 846 int 847 tmpfs_rmdir(void *v) 848 { 849 struct vop_rmdir_v2_args /* { 850 struct vnode *a_dvp; 851 struct vnode *a_vp; 852 struct componentname *a_cnp; 853 } */ *ap = v; 854 vnode_t *dvp = ap->a_dvp; 855 vnode_t *vp = ap->a_vp; 856 tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); 857 tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); 858 tmpfs_node_t *node = VP_TO_TMPFS_DIR(vp); 859 tmpfs_dirent_t *de; 860 int error = 0; 861 862 KASSERT(VOP_ISLOCKED(dvp)); 863 KASSERT(VOP_ISLOCKED(vp)); 864 865 /* 866 * Directories with more than two entries ('.' and '..') cannot be 867 * removed. There may be whiteout entries, which we will destroy. 868 */ 869 if (node->tn_size > 0) { 870 /* 871 * If never had whiteout entries, the directory is certainly 872 * not empty. Otherwise, scan for any non-whiteout entry. 873 */ 874 if ((node->tn_gen & TMPFS_WHITEOUT_BIT) == 0) { 875 error = ENOTEMPTY; 876 goto out; 877 } 878 TAILQ_FOREACH(de, &node->tn_spec.tn_dir.tn_dir, td_entries) { 879 if (de->td_node != TMPFS_NODE_WHITEOUT) { 880 error = ENOTEMPTY; 881 goto out; 882 } 883 } 884 KASSERT(error == 0); 885 } 886 887 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 888 889 /* Lookup the directory entry (check the cached hint first). */ 890 de = tmpfs_dir_cached(node); 891 if (de == NULL) { 892 struct componentname *cnp = ap->a_cnp; 893 de = tmpfs_dir_lookup(dnode, cnp); 894 } 895 KASSERT(de && de->td_node == node); 896 897 /* Check flags to see if we are allowed to remove the directory. */ 898 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 899 error = EPERM; 900 goto out; 901 } 902 903 /* Decrement the link count for the virtual '.' entry. */ 904 node->tn_links--; 905 906 /* Detach the directory entry from the directory. */ 907 tmpfs_dir_detach(dnode, de); 908 909 /* Purge the cache for parent. */ 910 cache_purge(dvp); 911 912 /* 913 * Destroy the directory entry or replace it with a whiteout. 914 * 915 * Note: the inode referred by it will not be destroyed until the 916 * vnode is reclaimed. 917 */ 918 if (ap->a_cnp->cn_flags & DOWHITEOUT) 919 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 920 else 921 tmpfs_free_dirent(tmp, de); 922 923 /* Destroy the whiteout entries from the node. */ 924 while ((de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir)) != NULL) { 925 KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); 926 tmpfs_dir_detach(node, de); 927 tmpfs_free_dirent(tmp, de); 928 } 929 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 930 931 KASSERT(node->tn_size == 0); 932 KASSERT(node->tn_links == 0); 933 out: 934 /* Release the node. */ 935 KASSERT(dvp != vp); 936 vput(vp); 937 return error; 938 } 939 940 int 941 tmpfs_symlink(void *v) 942 { 943 struct vop_symlink_v3_args /* { 944 struct vnode *a_dvp; 945 struct vnode **a_vpp; 946 struct componentname *a_cnp; 947 struct vattr *a_vap; 948 char *a_target; 949 } */ *ap = v; 950 vnode_t *dvp = ap->a_dvp; 951 vnode_t **vpp = ap->a_vpp; 952 struct componentname *cnp = ap->a_cnp; 953 struct vattr *vap = ap->a_vap; 954 char *target = ap->a_target; 955 956 KASSERT(vap->va_type == VLNK); 957 return tmpfs_construct_node(dvp, vpp, vap, cnp, target); 958 } 959 960 int 961 tmpfs_readdir(void *v) 962 { 963 struct vop_readdir_args /* { 964 struct vnode *a_vp; 965 struct uio *a_uio; 966 kauth_cred_t a_cred; 967 int *a_eofflag; 968 off_t **a_cookies; 969 int *ncookies; 970 } */ *ap = v; 971 vnode_t *vp = ap->a_vp; 972 struct uio *uio = ap->a_uio; 973 int *eofflag = ap->a_eofflag; 974 off_t **cookies = ap->a_cookies; 975 int *ncookies = ap->a_ncookies; 976 off_t startoff, cnt; 977 tmpfs_node_t *node; 978 int error; 979 980 KASSERT(VOP_ISLOCKED(vp)); 981 982 /* This operation only makes sense on directory nodes. */ 983 if (vp->v_type != VDIR) { 984 return ENOTDIR; 985 } 986 node = VP_TO_TMPFS_DIR(vp); 987 startoff = uio->uio_offset; 988 cnt = 0; 989 990 /* 991 * Retrieve the directory entries, unless it is being destroyed. 992 */ 993 if (node->tn_links) { 994 error = tmpfs_dir_getdents(node, uio, &cnt); 995 } else { 996 error = 0; 997 } 998 999 if (eofflag != NULL) { 1000 *eofflag = !error && uio->uio_offset == TMPFS_DIRSEQ_EOF; 1001 } 1002 if (error || cookies == NULL || ncookies == NULL) { 1003 return error; 1004 } 1005 1006 /* Update NFS-related variables, if any. */ 1007 tmpfs_dirent_t *de = NULL; 1008 off_t i, off = startoff; 1009 1010 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1011 *ncookies = cnt; 1012 1013 for (i = 0; i < cnt; i++) { 1014 KASSERT(off != TMPFS_DIRSEQ_EOF); 1015 if (off != TMPFS_DIRSEQ_DOT) { 1016 if (off == TMPFS_DIRSEQ_DOTDOT) { 1017 de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir); 1018 } else if (de != NULL) { 1019 de = TAILQ_NEXT(de, td_entries); 1020 } else { 1021 de = tmpfs_dir_lookupbyseq(node, off); 1022 KASSERT(de != NULL); 1023 de = TAILQ_NEXT(de, td_entries); 1024 } 1025 if (de == NULL) { 1026 off = TMPFS_DIRSEQ_EOF; 1027 } else { 1028 off = tmpfs_dir_getseq(node, de); 1029 } 1030 } else { 1031 off = TMPFS_DIRSEQ_DOTDOT; 1032 } 1033 (*cookies)[i] = off; 1034 } 1035 KASSERT(uio->uio_offset == off); 1036 return error; 1037 } 1038 1039 int 1040 tmpfs_readlink(void *v) 1041 { 1042 struct vop_readlink_args /* { 1043 struct vnode *a_vp; 1044 struct uio *a_uio; 1045 kauth_cred_t a_cred; 1046 } */ *ap = v; 1047 vnode_t *vp = ap->a_vp; 1048 struct uio *uio = ap->a_uio; 1049 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1050 int error; 1051 1052 KASSERT(VOP_ISLOCKED(vp)); 1053 KASSERT(uio->uio_offset == 0); 1054 KASSERT(vp->v_type == VLNK); 1055 1056 /* Note: readlink(2) returns the path without NUL terminator. */ 1057 if (node->tn_size > 0) { 1058 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1059 MIN(node->tn_size, uio->uio_resid), uio); 1060 } else { 1061 error = 0; 1062 } 1063 tmpfs_update(vp, TMPFS_UPDATE_ATIME); 1064 1065 return error; 1066 } 1067 1068 int 1069 tmpfs_inactive(void *v) 1070 { 1071 struct vop_inactive_v2_args /* { 1072 struct vnode *a_vp; 1073 bool *a_recycle; 1074 } */ *ap = v; 1075 vnode_t *vp = ap->a_vp; 1076 tmpfs_node_t *node; 1077 int error = 0; 1078 1079 KASSERT(VOP_ISLOCKED(vp)); 1080 1081 node = VP_TO_TMPFS_NODE(vp); 1082 if (node->tn_links == 0) { 1083 /* 1084 * Mark node as dead by setting its generation to zero. 1085 */ 1086 atomic_and_32(&node->tn_gen, ~TMPFS_NODE_GEN_MASK); 1087 1088 /* 1089 * If the file has been deleted, truncate it, otherwise VFS 1090 * will quite rightly try to write back dirty data, which in 1091 * the case of tmpfs/UAO means needless page deactivations. 1092 */ 1093 if (vp->v_type == VREG) { 1094 error = tmpfs_reg_resize(vp, 0); 1095 } 1096 *ap->a_recycle = true; 1097 } else { 1098 tmpfs_update(vp, 0); 1099 *ap->a_recycle = false; 1100 } 1101 1102 return error; 1103 } 1104 1105 int 1106 tmpfs_reclaim(void *v) 1107 { 1108 struct vop_reclaim_v2_args /* { 1109 struct vnode *a_vp; 1110 } */ *ap = v; 1111 vnode_t *vp = ap->a_vp; 1112 tmpfs_mount_t *tmp = VFS_TO_TMPFS(vp->v_mount); 1113 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1114 1115 /* Unlock vnode. We still have exclusive access to it. */ 1116 VOP_UNLOCK(vp); 1117 1118 /* Disassociate inode from vnode. */ 1119 node->tn_vnode = NULL; 1120 vp->v_data = NULL; 1121 1122 /* If inode is not referenced, i.e. no links, then destroy it. */ 1123 if (node->tn_links == 0) 1124 tmpfs_free_node(tmp, node); 1125 return 0; 1126 } 1127 1128 int 1129 tmpfs_pathconf(void *v) 1130 { 1131 struct vop_pathconf_args /* { 1132 struct vnode *a_vp; 1133 int a_name; 1134 register_t *a_retval; 1135 } */ *ap = v; 1136 register_t *retval = ap->a_retval; 1137 1138 switch (ap->a_name) { 1139 case _PC_LINK_MAX: 1140 *retval = LINK_MAX; 1141 return 0; 1142 case _PC_NAME_MAX: 1143 *retval = TMPFS_MAXNAMLEN; 1144 return 0; 1145 case _PC_PATH_MAX: 1146 *retval = PATH_MAX; 1147 return 0; 1148 case _PC_PIPE_BUF: 1149 *retval = PIPE_BUF; 1150 return 0; 1151 case _PC_CHOWN_RESTRICTED: 1152 *retval = 1; 1153 return 0; 1154 case _PC_NO_TRUNC: 1155 *retval = 1; 1156 return 0; 1157 case _PC_SYNC_IO: 1158 *retval = 1; 1159 return 0; 1160 case _PC_FILESIZEBITS: 1161 *retval = sizeof(off_t) * CHAR_BIT; 1162 return 0; 1163 default: 1164 return genfs_pathconf(ap); 1165 } 1166 } 1167 1168 int 1169 tmpfs_advlock(void *v) 1170 { 1171 struct vop_advlock_args /* { 1172 struct vnode *a_vp; 1173 void * a_id; 1174 int a_op; 1175 struct flock *a_fl; 1176 int a_flags; 1177 } */ *ap = v; 1178 vnode_t *vp = ap->a_vp; 1179 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1180 1181 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1182 } 1183 1184 int 1185 tmpfs_getpages(void *v) 1186 { 1187 struct vop_getpages_args /* { 1188 struct vnode *a_vp; 1189 voff_t a_offset; 1190 struct vm_page **a_m; 1191 int *a_count; 1192 int a_centeridx; 1193 vm_prot_t a_access_type; 1194 int a_advice; 1195 int a_flags; 1196 } */ * const ap = v; 1197 vnode_t *vp = ap->a_vp; 1198 const voff_t offset = ap->a_offset; 1199 struct vm_page **pgs = ap->a_m; 1200 const int centeridx = ap->a_centeridx; 1201 const vm_prot_t access_type = ap->a_access_type; 1202 const int advice = ap->a_advice; 1203 const int flags = ap->a_flags; 1204 int error, iflag, npages = *ap->a_count; 1205 tmpfs_node_t *node; 1206 struct uvm_object *uobj; 1207 1208 KASSERT(vp->v_type == VREG); 1209 KASSERT(rw_lock_held(vp->v_uobj.vmobjlock)); 1210 1211 /* 1212 * Currently, PGO_PASTEOF is not supported. 1213 */ 1214 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1215 if ((flags & PGO_LOCKED) == 0) 1216 rw_exit(vp->v_uobj.vmobjlock); 1217 return EINVAL; 1218 } 1219 1220 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1221 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1222 } 1223 1224 /* 1225 * Check for reclaimed vnode. v_interlock is not held here, but 1226 * VI_DEADCHECK is set with vmobjlock held. 1227 */ 1228 iflag = atomic_load_relaxed(&vp->v_iflag); 1229 if (__predict_false((iflag & VI_DEADCHECK) != 0)) { 1230 mutex_enter(vp->v_interlock); 1231 error = vdead_check(vp, VDEAD_NOWAIT); 1232 mutex_exit(vp->v_interlock); 1233 if (error) { 1234 if ((flags & PGO_LOCKED) == 0) 1235 rw_exit(vp->v_uobj.vmobjlock); 1236 return error; 1237 } 1238 } 1239 1240 node = VP_TO_TMPFS_NODE(vp); 1241 uobj = node->tn_spec.tn_reg.tn_aobj; 1242 1243 /* 1244 * Update timestamp lazily. The update will be made real when 1245 * a synchronous update is next made -- or by tmpfs_getattr, 1246 * tmpfs_putpages, and tmpfs_inactive. 1247 */ 1248 if ((flags & PGO_NOTIMESTAMP) == 0) { 1249 u_int tflags = 0; 1250 1251 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1252 tflags |= TMPFS_UPDATE_ATIME; 1253 1254 if ((access_type & VM_PROT_WRITE) != 0) { 1255 tflags |= TMPFS_UPDATE_MTIME; 1256 if (vp->v_mount->mnt_flag & MNT_RELATIME) 1257 tflags |= TMPFS_UPDATE_ATIME; 1258 } 1259 tmpfs_update_lazily(vp, tflags); 1260 } 1261 1262 /* Invoke the pager. The vnode vmobjlock is shared with the UAO. */ 1263 KASSERT(vp->v_uobj.vmobjlock == uobj->vmobjlock); 1264 error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, centeridx, 1265 access_type, advice, flags); 1266 #if defined(DEBUG) 1267 if (!error && pgs) { 1268 KASSERT(pgs[centeridx] != NULL); 1269 } 1270 #endif 1271 return error; 1272 } 1273 1274 int 1275 tmpfs_putpages(void *v) 1276 { 1277 struct vop_putpages_args /* { 1278 struct vnode *a_vp; 1279 voff_t a_offlo; 1280 voff_t a_offhi; 1281 int a_flags; 1282 } */ * const ap = v; 1283 vnode_t *vp = ap->a_vp; 1284 const voff_t offlo = ap->a_offlo; 1285 const voff_t offhi = ap->a_offhi; 1286 const int flags = ap->a_flags; 1287 tmpfs_node_t *node; 1288 struct uvm_object *uobj; 1289 int error; 1290 1291 KASSERT(rw_write_held(vp->v_uobj.vmobjlock)); 1292 1293 if (vp->v_type != VREG) { 1294 rw_exit(vp->v_uobj.vmobjlock); 1295 return 0; 1296 } 1297 1298 node = VP_TO_TMPFS_NODE(vp); 1299 uobj = node->tn_spec.tn_reg.tn_aobj; 1300 1301 KASSERT(vp->v_uobj.vmobjlock == uobj->vmobjlock); 1302 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1303 1304 /* XXX mtime */ 1305 1306 /* Process deferred updates. */ 1307 tmpfs_update(vp, 0); 1308 return error; 1309 } 1310 1311 int 1312 tmpfs_whiteout(void *v) 1313 { 1314 struct vop_whiteout_args /* { 1315 struct vnode *a_dvp; 1316 struct componentname *a_cnp; 1317 int a_flags; 1318 } */ *ap = v; 1319 vnode_t *dvp = ap->a_dvp; 1320 struct componentname *cnp = ap->a_cnp; 1321 const int flags = ap->a_flags; 1322 tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); 1323 tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); 1324 tmpfs_dirent_t *de; 1325 int error; 1326 1327 switch (flags) { 1328 case LOOKUP: 1329 break; 1330 case CREATE: 1331 error = tmpfs_alloc_dirent(tmp, cnp->cn_nameptr, 1332 cnp->cn_namelen, &de); 1333 if (error) 1334 return error; 1335 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 1336 break; 1337 case DELETE: 1338 cnp->cn_flags &= ~DOWHITEOUT; /* when in doubt, cargo cult */ 1339 de = tmpfs_dir_lookup(dnode, cnp); 1340 if (de == NULL) 1341 return ENOENT; 1342 tmpfs_dir_detach(dnode, de); 1343 tmpfs_free_dirent(tmp, de); 1344 break; 1345 } 1346 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 1347 return 0; 1348 } 1349 1350 int 1351 tmpfs_print(void *v) 1352 { 1353 struct vop_print_args /* { 1354 struct vnode *a_vp; 1355 } */ *ap = v; 1356 vnode_t *vp = ap->a_vp; 1357 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1358 1359 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n" 1360 "\tmode 0%o, owner %d, group %d, size %" PRIdMAX, 1361 node, node->tn_flags, node->tn_links, node->tn_mode, node->tn_uid, 1362 node->tn_gid, (uintmax_t)node->tn_size); 1363 if (vp->v_type == VFIFO) { 1364 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1365 } 1366 printf("\n"); 1367 return 0; 1368 } 1369