1 /* $NetBSD: tmpfs_vnops.c,v 1.150 2022/06/01 08:42:38 hannken 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 1.150 2022/06/01 08:42:38 hannken 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 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 559 tmpfs_update(vp, TMPFS_UPDATE_ATIME); 560 561 return error; 562 } 563 564 int 565 tmpfs_write(void *v) 566 { 567 struct vop_write_args /* { 568 struct vnode *a_vp; 569 struct uio *a_uio; 570 int a_ioflag; 571 kauth_cred_t a_cred; 572 } */ *ap = v; 573 vnode_t *vp = ap->a_vp; 574 struct uio *uio = ap->a_uio; 575 const int ioflag = ap->a_ioflag; 576 tmpfs_node_t *node; 577 struct uvm_object *uobj; 578 off_t oldsize; 579 int error, ubc_flags; 580 581 KASSERT(VOP_ISLOCKED(vp)); 582 583 node = VP_TO_TMPFS_NODE(vp); 584 oldsize = node->tn_size; 585 586 if ((vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 587 error = EROFS; 588 goto out; 589 } 590 591 if (uio->uio_offset < 0 || vp->v_type != VREG) { 592 error = EINVAL; 593 goto out; 594 } 595 if (uio->uio_resid == 0) { 596 error = 0; 597 goto out; 598 } 599 if (ioflag & IO_APPEND) { 600 uio->uio_offset = node->tn_size; 601 } 602 603 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 604 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 605 if (error) 606 goto out; 607 } 608 609 /* 610 * If we're extending the file and have data to write that would 611 * not leave an un-zeroed hole, we can avoid fault processing and 612 * zeroing of pages on allocation. 613 * 614 * Don't do this if the file is mapped and we need to touch an 615 * existing page, because writing a mapping of the file into itself 616 * could cause a deadlock on PG_BUSY. 617 * 618 * New pages will not become visible until finished here (because 619 * of PG_BUSY and the vnode lock). 620 */ 621 ubc_flags = UBC_WRITE | UBC_VNODE_FLAGS(vp); 622 #if 0 623 /* 624 * XXX disable use of UBC_FAULTBUSY for now, this check is insufficient 625 * because it does not zero uninitialized parts of pages in all of 626 * the cases where zeroing is needed. 627 */ 628 if (uio->uio_offset >= oldsize && 629 ((uio->uio_offset & (PAGE_SIZE - 1)) == 0 || 630 ((vp->v_vflag & VV_MAPPED) == 0 && 631 trunc_page(uio->uio_offset) == trunc_page(oldsize)))) { 632 ubc_flags |= UBC_FAULTBUSY; 633 } 634 #endif 635 636 uobj = node->tn_spec.tn_reg.tn_aobj; 637 error = 0; 638 while (error == 0 && uio->uio_resid > 0) { 639 vsize_t len; 640 641 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 642 if (len == 0) { 643 break; 644 } 645 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 646 ubc_flags); 647 } 648 if (error) { 649 (void)tmpfs_reg_resize(vp, oldsize); 650 } 651 652 tmpfs_update(vp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 653 out: 654 if (error) { 655 KASSERT(oldsize == node->tn_size); 656 } else { 657 KASSERT(uio->uio_resid == 0); 658 } 659 return error; 660 } 661 662 int 663 tmpfs_fsync(void *v) 664 { 665 struct vop_fsync_args /* { 666 struct vnode *a_vp; 667 kauth_cred_t a_cred; 668 int a_flags; 669 off_t a_offlo; 670 off_t a_offhi; 671 struct lwp *a_l; 672 } */ *ap = v; 673 vnode_t *vp __diagused = ap->a_vp; 674 675 /* Nothing to do. Should be up to date. */ 676 KASSERT(VOP_ISLOCKED(vp)); 677 return 0; 678 } 679 680 /* 681 * tmpfs_remove: unlink a file. 682 * 683 * => Both directory (dvp) and file (vp) are locked. 684 * => We unlock and drop the reference on both. 685 */ 686 int 687 tmpfs_remove(void *v) 688 { 689 struct vop_remove_v3_args /* { 690 struct vnode *a_dvp; 691 struct vnode *a_vp; 692 struct componentname *a_cnp; 693 nlink_t ctx_vp_new_nlink; 694 } */ *ap = v; 695 vnode_t *dvp = ap->a_dvp, *vp = ap->a_vp; 696 tmpfs_node_t *dnode, *node; 697 tmpfs_dirent_t *de; 698 int error, tflags; 699 700 KASSERT(VOP_ISLOCKED(dvp)); 701 KASSERT(VOP_ISLOCKED(vp)); 702 703 if (vp->v_type == VDIR) { 704 error = EPERM; 705 goto out; 706 } 707 dnode = VP_TO_TMPFS_DIR(dvp); 708 node = VP_TO_TMPFS_NODE(vp); 709 710 /* 711 * Files marked as immutable or append-only cannot be deleted. 712 * Likewise, files residing on directories marked as append-only 713 * cannot be deleted. 714 */ 715 if (node->tn_flags & (IMMUTABLE | APPEND)) { 716 error = EPERM; 717 goto out; 718 } 719 if (dnode->tn_flags & APPEND) { 720 error = EPERM; 721 goto out; 722 } 723 724 /* Lookup the directory entry (check the cached hint first). */ 725 de = tmpfs_dir_cached(node); 726 if (de == NULL) { 727 struct componentname *cnp = ap->a_cnp; 728 de = tmpfs_dir_lookup(dnode, cnp); 729 } 730 KASSERT(de && de->td_node == node); 731 732 /* 733 * Remove the entry from the directory (drops the link count) and 734 * destroy it or replace with a whiteout. 735 * 736 * Note: the inode referred by it will not be destroyed until the 737 * vnode is reclaimed/recycled. 738 */ 739 740 tmpfs_dir_detach(dnode, de); 741 742 if (ap->a_cnp->cn_flags & DOWHITEOUT) 743 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 744 else 745 tmpfs_free_dirent(VFS_TO_TMPFS(vp->v_mount), de); 746 747 tflags = TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME; 748 if (node->tn_links > 0) { 749 /* We removed a hard link. */ 750 tflags |= TMPFS_UPDATE_CTIME; 751 } 752 ap->ctx_vp_new_nlink = node->tn_links; 753 tmpfs_update(dvp, tflags); 754 error = 0; 755 out: 756 /* Drop the reference and unlock the node. */ 757 if (dvp == vp) { 758 vrele(vp); 759 } else { 760 vput(vp); 761 } 762 return error; 763 } 764 765 /* 766 * tmpfs_link: create a hard link. 767 */ 768 int 769 tmpfs_link(void *v) 770 { 771 struct vop_link_v2_args /* { 772 struct vnode *a_dvp; 773 struct vnode *a_vp; 774 struct componentname *a_cnp; 775 } */ *ap = v; 776 vnode_t *dvp = ap->a_dvp; 777 vnode_t *vp = ap->a_vp; 778 struct componentname *cnp = ap->a_cnp; 779 tmpfs_node_t *dnode, *node; 780 tmpfs_dirent_t *de; 781 int error; 782 783 KASSERT(dvp != vp); 784 KASSERT(VOP_ISLOCKED(dvp)); 785 KASSERT(vp->v_type != VDIR); 786 KASSERT(dvp->v_mount == vp->v_mount); 787 788 dnode = VP_TO_TMPFS_DIR(dvp); 789 node = VP_TO_TMPFS_NODE(vp); 790 791 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 792 793 /* Check for maximum number of links limit. */ 794 if (node->tn_links == LINK_MAX) { 795 error = EMLINK; 796 goto out; 797 } 798 KASSERT(node->tn_links < LINK_MAX); 799 800 /* We cannot create links of files marked immutable or append-only. */ 801 if (node->tn_flags & (IMMUTABLE | APPEND)) { 802 error = EPERM; 803 goto out; 804 } 805 806 error = kauth_authorize_vnode(cnp->cn_cred, KAUTH_VNODE_ADD_LINK, vp, 807 dvp, 0); 808 if (error) 809 goto out; 810 811 /* Allocate a new directory entry to represent the inode. */ 812 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), 813 cnp->cn_nameptr, cnp->cn_namelen, &de); 814 if (error) { 815 goto out; 816 } 817 818 /* 819 * Insert the entry into the directory. 820 * It will increase the inode link count. 821 */ 822 tmpfs_dir_attach(dnode, de, node); 823 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 824 825 /* Update the timestamps. */ 826 tmpfs_update(vp, TMPFS_UPDATE_CTIME); 827 error = 0; 828 out: 829 VOP_UNLOCK(vp); 830 return error; 831 } 832 833 int 834 tmpfs_mkdir(void *v) 835 { 836 struct vop_mkdir_v3_args /* { 837 struct vnode *a_dvp; 838 struct vnode **a_vpp; 839 struct componentname *a_cnp; 840 struct vattr *a_vap; 841 } */ *ap = v; 842 vnode_t *dvp = ap->a_dvp; 843 vnode_t **vpp = ap->a_vpp; 844 struct componentname *cnp = ap->a_cnp; 845 struct vattr *vap = ap->a_vap; 846 847 KASSERT(vap->va_type == VDIR); 848 return tmpfs_construct_node(dvp, vpp, vap, cnp, NULL); 849 } 850 851 int 852 tmpfs_rmdir(void *v) 853 { 854 struct vop_rmdir_v2_args /* { 855 struct vnode *a_dvp; 856 struct vnode *a_vp; 857 struct componentname *a_cnp; 858 } */ *ap = v; 859 vnode_t *dvp = ap->a_dvp; 860 vnode_t *vp = ap->a_vp; 861 tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); 862 tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); 863 tmpfs_node_t *node = VP_TO_TMPFS_DIR(vp); 864 tmpfs_dirent_t *de; 865 int error = 0; 866 867 KASSERT(VOP_ISLOCKED(dvp)); 868 KASSERT(VOP_ISLOCKED(vp)); 869 870 /* 871 * Directories with more than two entries ('.' and '..') cannot be 872 * removed. There may be whiteout entries, which we will destroy. 873 */ 874 if (node->tn_size > 0) { 875 /* 876 * If never had whiteout entries, the directory is certainly 877 * not empty. Otherwise, scan for any non-whiteout entry. 878 */ 879 if ((node->tn_gen & TMPFS_WHITEOUT_BIT) == 0) { 880 error = ENOTEMPTY; 881 goto out; 882 } 883 TAILQ_FOREACH(de, &node->tn_spec.tn_dir.tn_dir, td_entries) { 884 if (de->td_node != TMPFS_NODE_WHITEOUT) { 885 error = ENOTEMPTY; 886 goto out; 887 } 888 } 889 KASSERT(error == 0); 890 } 891 892 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 893 894 /* Lookup the directory entry (check the cached hint first). */ 895 de = tmpfs_dir_cached(node); 896 if (de == NULL) { 897 struct componentname *cnp = ap->a_cnp; 898 de = tmpfs_dir_lookup(dnode, cnp); 899 } 900 KASSERT(de && de->td_node == node); 901 902 /* Check flags to see if we are allowed to remove the directory. */ 903 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 904 error = EPERM; 905 goto out; 906 } 907 908 /* Decrement the link count for the virtual '.' entry. */ 909 node->tn_links--; 910 911 /* Detach the directory entry from the directory. */ 912 tmpfs_dir_detach(dnode, de); 913 914 /* Purge the cache for parent. */ 915 cache_purge(dvp); 916 917 /* 918 * Destroy the directory entry or replace it with a whiteout. 919 * 920 * Note: the inode referred by it will not be destroyed until the 921 * vnode is reclaimed. 922 */ 923 if (ap->a_cnp->cn_flags & DOWHITEOUT) 924 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 925 else 926 tmpfs_free_dirent(tmp, de); 927 928 /* Destroy the whiteout entries from the node. */ 929 while ((de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir)) != NULL) { 930 KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); 931 tmpfs_dir_detach(node, de); 932 tmpfs_free_dirent(tmp, de); 933 } 934 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 935 936 KASSERT(node->tn_size == 0); 937 KASSERT(node->tn_links == 0); 938 out: 939 /* Release the node. */ 940 KASSERT(dvp != vp); 941 vput(vp); 942 return error; 943 } 944 945 int 946 tmpfs_symlink(void *v) 947 { 948 struct vop_symlink_v3_args /* { 949 struct vnode *a_dvp; 950 struct vnode **a_vpp; 951 struct componentname *a_cnp; 952 struct vattr *a_vap; 953 char *a_target; 954 } */ *ap = v; 955 vnode_t *dvp = ap->a_dvp; 956 vnode_t **vpp = ap->a_vpp; 957 struct componentname *cnp = ap->a_cnp; 958 struct vattr *vap = ap->a_vap; 959 char *target = ap->a_target; 960 961 KASSERT(vap->va_type == VLNK); 962 return tmpfs_construct_node(dvp, vpp, vap, cnp, target); 963 } 964 965 int 966 tmpfs_readdir(void *v) 967 { 968 struct vop_readdir_args /* { 969 struct vnode *a_vp; 970 struct uio *a_uio; 971 kauth_cred_t a_cred; 972 int *a_eofflag; 973 off_t **a_cookies; 974 int *ncookies; 975 } */ *ap = v; 976 vnode_t *vp = ap->a_vp; 977 struct uio *uio = ap->a_uio; 978 int *eofflag = ap->a_eofflag; 979 off_t **cookies = ap->a_cookies; 980 int *ncookies = ap->a_ncookies; 981 off_t startoff, cnt; 982 tmpfs_node_t *node; 983 int error; 984 985 KASSERT(VOP_ISLOCKED(vp)); 986 987 /* This operation only makes sense on directory nodes. */ 988 if (vp->v_type != VDIR) { 989 return ENOTDIR; 990 } 991 node = VP_TO_TMPFS_DIR(vp); 992 startoff = uio->uio_offset; 993 cnt = 0; 994 995 /* 996 * Retrieve the directory entries, unless it is being destroyed. 997 */ 998 if (node->tn_links) { 999 error = tmpfs_dir_getdents(node, uio, &cnt); 1000 } else { 1001 error = 0; 1002 } 1003 1004 if (eofflag != NULL) { 1005 *eofflag = !error && uio->uio_offset == TMPFS_DIRSEQ_EOF; 1006 } 1007 if (error || cookies == NULL || ncookies == NULL) { 1008 return error; 1009 } 1010 1011 /* Update NFS-related variables, if any. */ 1012 tmpfs_dirent_t *de = NULL; 1013 off_t i, off = startoff; 1014 1015 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1016 *ncookies = cnt; 1017 1018 for (i = 0; i < cnt; i++) { 1019 KASSERT(off != TMPFS_DIRSEQ_EOF); 1020 if (off != TMPFS_DIRSEQ_DOT) { 1021 if (off == TMPFS_DIRSEQ_DOTDOT) { 1022 de = TAILQ_FIRST(&node->tn_spec.tn_dir.tn_dir); 1023 } else if (de != NULL) { 1024 de = TAILQ_NEXT(de, td_entries); 1025 } else { 1026 de = tmpfs_dir_lookupbyseq(node, off); 1027 KASSERT(de != NULL); 1028 de = TAILQ_NEXT(de, td_entries); 1029 } 1030 if (de == NULL) { 1031 off = TMPFS_DIRSEQ_EOF; 1032 } else { 1033 off = tmpfs_dir_getseq(node, de); 1034 } 1035 } else { 1036 off = TMPFS_DIRSEQ_DOTDOT; 1037 } 1038 (*cookies)[i] = off; 1039 } 1040 KASSERT(uio->uio_offset == off); 1041 return error; 1042 } 1043 1044 int 1045 tmpfs_readlink(void *v) 1046 { 1047 struct vop_readlink_args /* { 1048 struct vnode *a_vp; 1049 struct uio *a_uio; 1050 kauth_cred_t a_cred; 1051 } */ *ap = v; 1052 vnode_t *vp = ap->a_vp; 1053 struct uio *uio = ap->a_uio; 1054 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1055 int error; 1056 1057 KASSERT(VOP_ISLOCKED(vp)); 1058 KASSERT(uio->uio_offset == 0); 1059 KASSERT(vp->v_type == VLNK); 1060 1061 /* Note: readlink(2) returns the path without NUL terminator. */ 1062 if (node->tn_size > 0) { 1063 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1064 MIN(node->tn_size, uio->uio_resid), uio); 1065 } else { 1066 error = 0; 1067 } 1068 tmpfs_update(vp, TMPFS_UPDATE_ATIME); 1069 1070 return error; 1071 } 1072 1073 int 1074 tmpfs_inactive(void *v) 1075 { 1076 struct vop_inactive_v2_args /* { 1077 struct vnode *a_vp; 1078 bool *a_recycle; 1079 } */ *ap = v; 1080 vnode_t *vp = ap->a_vp; 1081 tmpfs_node_t *node; 1082 int error = 0; 1083 1084 KASSERT(VOP_ISLOCKED(vp)); 1085 1086 node = VP_TO_TMPFS_NODE(vp); 1087 if (node->tn_links == 0) { 1088 /* 1089 * Mark node as dead by setting its generation to zero. 1090 */ 1091 atomic_and_32(&node->tn_gen, ~TMPFS_NODE_GEN_MASK); 1092 1093 /* 1094 * If the file has been deleted, truncate it, otherwise VFS 1095 * will quite rightly try to write back dirty data, which in 1096 * the case of tmpfs/UAO means needless page deactivations. 1097 */ 1098 if (vp->v_type == VREG) { 1099 error = tmpfs_reg_resize(vp, 0); 1100 } 1101 *ap->a_recycle = true; 1102 } else { 1103 tmpfs_update(vp, 0); 1104 *ap->a_recycle = false; 1105 } 1106 1107 return error; 1108 } 1109 1110 int 1111 tmpfs_reclaim(void *v) 1112 { 1113 struct vop_reclaim_v2_args /* { 1114 struct vnode *a_vp; 1115 } */ *ap = v; 1116 vnode_t *vp = ap->a_vp; 1117 tmpfs_mount_t *tmp = VFS_TO_TMPFS(vp->v_mount); 1118 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1119 1120 /* Unlock vnode. We still have exclusive access to it. */ 1121 VOP_UNLOCK(vp); 1122 1123 /* Disassociate inode from vnode. */ 1124 node->tn_vnode = NULL; 1125 vp->v_data = NULL; 1126 1127 /* If inode is not referenced, i.e. no links, then destroy it. */ 1128 if (node->tn_links == 0) 1129 tmpfs_free_node(tmp, node); 1130 return 0; 1131 } 1132 1133 int 1134 tmpfs_pathconf(void *v) 1135 { 1136 struct vop_pathconf_args /* { 1137 struct vnode *a_vp; 1138 int a_name; 1139 register_t *a_retval; 1140 } */ *ap = v; 1141 register_t *retval = ap->a_retval; 1142 1143 switch (ap->a_name) { 1144 case _PC_LINK_MAX: 1145 *retval = LINK_MAX; 1146 return 0; 1147 case _PC_NAME_MAX: 1148 *retval = TMPFS_MAXNAMLEN; 1149 return 0; 1150 case _PC_PATH_MAX: 1151 *retval = PATH_MAX; 1152 return 0; 1153 case _PC_PIPE_BUF: 1154 *retval = PIPE_BUF; 1155 return 0; 1156 case _PC_CHOWN_RESTRICTED: 1157 *retval = 1; 1158 return 0; 1159 case _PC_NO_TRUNC: 1160 *retval = 1; 1161 return 0; 1162 case _PC_SYNC_IO: 1163 *retval = 1; 1164 return 0; 1165 case _PC_FILESIZEBITS: 1166 *retval = sizeof(off_t) * CHAR_BIT; 1167 return 0; 1168 default: 1169 return genfs_pathconf(ap); 1170 } 1171 } 1172 1173 int 1174 tmpfs_advlock(void *v) 1175 { 1176 struct vop_advlock_args /* { 1177 struct vnode *a_vp; 1178 void * a_id; 1179 int a_op; 1180 struct flock *a_fl; 1181 int a_flags; 1182 } */ *ap = v; 1183 vnode_t *vp = ap->a_vp; 1184 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1185 1186 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1187 } 1188 1189 int 1190 tmpfs_getpages(void *v) 1191 { 1192 struct vop_getpages_args /* { 1193 struct vnode *a_vp; 1194 voff_t a_offset; 1195 struct vm_page **a_m; 1196 int *a_count; 1197 int a_centeridx; 1198 vm_prot_t a_access_type; 1199 int a_advice; 1200 int a_flags; 1201 } */ * const ap = v; 1202 vnode_t *vp = ap->a_vp; 1203 const voff_t offset = ap->a_offset; 1204 struct vm_page **pgs = ap->a_m; 1205 const int centeridx = ap->a_centeridx; 1206 const vm_prot_t access_type = ap->a_access_type; 1207 const int advice = ap->a_advice; 1208 const int flags = ap->a_flags; 1209 int error, iflag, npages = *ap->a_count; 1210 tmpfs_node_t *node; 1211 struct uvm_object *uobj; 1212 1213 KASSERT(vp->v_type == VREG); 1214 KASSERT(rw_lock_held(vp->v_uobj.vmobjlock)); 1215 1216 /* 1217 * Currently, PGO_PASTEOF is not supported. 1218 */ 1219 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1220 if ((flags & PGO_LOCKED) == 0) 1221 rw_exit(vp->v_uobj.vmobjlock); 1222 return EINVAL; 1223 } 1224 1225 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1226 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1227 } 1228 1229 /* 1230 * Check for reclaimed vnode. v_interlock is not held here, but 1231 * VI_DEADCHECK is set with vmobjlock held. 1232 */ 1233 iflag = atomic_load_relaxed(&vp->v_iflag); 1234 if (__predict_false((iflag & VI_DEADCHECK) != 0)) { 1235 mutex_enter(vp->v_interlock); 1236 error = vdead_check(vp, VDEAD_NOWAIT); 1237 mutex_exit(vp->v_interlock); 1238 if (error) { 1239 if ((flags & PGO_LOCKED) == 0) 1240 rw_exit(vp->v_uobj.vmobjlock); 1241 return error; 1242 } 1243 } 1244 1245 node = VP_TO_TMPFS_NODE(vp); 1246 uobj = node->tn_spec.tn_reg.tn_aobj; 1247 1248 /* 1249 * Update timestamp lazily. The update will be made real when 1250 * a synchronous update is next made -- or by tmpfs_getattr, 1251 * tmpfs_putpages, and tmpfs_inactive. 1252 */ 1253 if ((flags & PGO_NOTIMESTAMP) == 0) { 1254 u_int tflags = 0; 1255 1256 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1257 tflags |= TMPFS_UPDATE_ATIME; 1258 1259 if ((access_type & VM_PROT_WRITE) != 0) { 1260 tflags |= TMPFS_UPDATE_MTIME; 1261 if (vp->v_mount->mnt_flag & MNT_RELATIME) 1262 tflags |= TMPFS_UPDATE_ATIME; 1263 } 1264 tmpfs_update_lazily(vp, tflags); 1265 } 1266 1267 /* Invoke the pager. The vnode vmobjlock is shared with the UAO. */ 1268 KASSERT(vp->v_uobj.vmobjlock == uobj->vmobjlock); 1269 error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, centeridx, 1270 access_type, advice, flags); 1271 #if defined(DEBUG) 1272 if (!error && pgs) { 1273 KASSERT(pgs[centeridx] != NULL); 1274 } 1275 #endif 1276 return error; 1277 } 1278 1279 int 1280 tmpfs_putpages(void *v) 1281 { 1282 struct vop_putpages_args /* { 1283 struct vnode *a_vp; 1284 voff_t a_offlo; 1285 voff_t a_offhi; 1286 int a_flags; 1287 } */ * const ap = v; 1288 vnode_t *vp = ap->a_vp; 1289 const voff_t offlo = ap->a_offlo; 1290 const voff_t offhi = ap->a_offhi; 1291 const int flags = ap->a_flags; 1292 tmpfs_node_t *node; 1293 struct uvm_object *uobj; 1294 int error; 1295 1296 KASSERT(rw_write_held(vp->v_uobj.vmobjlock)); 1297 1298 if (vp->v_type != VREG) { 1299 rw_exit(vp->v_uobj.vmobjlock); 1300 return 0; 1301 } 1302 1303 node = VP_TO_TMPFS_NODE(vp); 1304 uobj = node->tn_spec.tn_reg.tn_aobj; 1305 1306 KASSERT(vp->v_uobj.vmobjlock == uobj->vmobjlock); 1307 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1308 1309 /* XXX mtime */ 1310 1311 /* Process deferred updates. */ 1312 tmpfs_update(vp, 0); 1313 return error; 1314 } 1315 1316 int 1317 tmpfs_whiteout(void *v) 1318 { 1319 struct vop_whiteout_args /* { 1320 struct vnode *a_dvp; 1321 struct componentname *a_cnp; 1322 int a_flags; 1323 } */ *ap = v; 1324 vnode_t *dvp = ap->a_dvp; 1325 struct componentname *cnp = ap->a_cnp; 1326 const int flags = ap->a_flags; 1327 tmpfs_mount_t *tmp = VFS_TO_TMPFS(dvp->v_mount); 1328 tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); 1329 tmpfs_dirent_t *de; 1330 int error; 1331 1332 switch (flags) { 1333 case LOOKUP: 1334 break; 1335 case CREATE: 1336 error = tmpfs_alloc_dirent(tmp, cnp->cn_nameptr, 1337 cnp->cn_namelen, &de); 1338 if (error) 1339 return error; 1340 tmpfs_dir_attach(dnode, de, TMPFS_NODE_WHITEOUT); 1341 break; 1342 case DELETE: 1343 cnp->cn_flags &= ~DOWHITEOUT; /* when in doubt, cargo cult */ 1344 de = tmpfs_dir_lookup(dnode, cnp); 1345 if (de == NULL) 1346 return ENOENT; 1347 tmpfs_dir_detach(dnode, de); 1348 tmpfs_free_dirent(tmp, de); 1349 break; 1350 } 1351 tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); 1352 return 0; 1353 } 1354 1355 int 1356 tmpfs_print(void *v) 1357 { 1358 struct vop_print_args /* { 1359 struct vnode *a_vp; 1360 } */ *ap = v; 1361 vnode_t *vp = ap->a_vp; 1362 tmpfs_node_t *node = VP_TO_TMPFS_NODE(vp); 1363 1364 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n" 1365 "\tmode 0%o, owner %d, group %d, size %" PRIdMAX, 1366 node, node->tn_flags, node->tn_links, node->tn_mode, node->tn_uid, 1367 node->tn_gid, (uintmax_t)node->tn_size); 1368 if (vp->v_type == VFIFO) { 1369 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1370 } 1371 printf("\n"); 1372 return 0; 1373 } 1374
Indexes created Sun Sep 21 18:09:52 GMT 2025