1 /* $NetBSD: tmpfs_vnops.c,v 1.76 2011/01/13 13:35:12 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007 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 1.76 2011/01/13 13:35:12 pooka 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/proc.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/lockf.h> 52 #include <sys/kauth.h> 53 54 #include <uvm/uvm.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 63 /* 64 * vnode operations vector used for files stored in a tmpfs file system. 65 */ 66 int (**tmpfs_vnodeop_p)(void *); 67 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 68 { &vop_default_desc, vn_default_error }, 69 { &vop_lookup_desc, tmpfs_lookup }, 70 { &vop_create_desc, tmpfs_create }, 71 { &vop_mknod_desc, tmpfs_mknod }, 72 { &vop_open_desc, tmpfs_open }, 73 { &vop_close_desc, tmpfs_close }, 74 { &vop_access_desc, tmpfs_access }, 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_ioctl_desc, tmpfs_ioctl }, 80 { &vop_fcntl_desc, tmpfs_fcntl }, 81 { &vop_poll_desc, tmpfs_poll }, 82 { &vop_kqfilter_desc, tmpfs_kqfilter }, 83 { &vop_revoke_desc, tmpfs_revoke }, 84 { &vop_mmap_desc, tmpfs_mmap }, 85 { &vop_fsync_desc, tmpfs_fsync }, 86 { &vop_seek_desc, tmpfs_seek }, 87 { &vop_remove_desc, tmpfs_remove }, 88 { &vop_link_desc, tmpfs_link }, 89 { &vop_rename_desc, tmpfs_rename }, 90 { &vop_mkdir_desc, tmpfs_mkdir }, 91 { &vop_rmdir_desc, tmpfs_rmdir }, 92 { &vop_symlink_desc, tmpfs_symlink }, 93 { &vop_readdir_desc, tmpfs_readdir }, 94 { &vop_readlink_desc, tmpfs_readlink }, 95 { &vop_abortop_desc, tmpfs_abortop }, 96 { &vop_inactive_desc, tmpfs_inactive }, 97 { &vop_reclaim_desc, tmpfs_reclaim }, 98 { &vop_lock_desc, tmpfs_lock }, 99 { &vop_unlock_desc, tmpfs_unlock }, 100 { &vop_bmap_desc, tmpfs_bmap }, 101 { &vop_strategy_desc, tmpfs_strategy }, 102 { &vop_print_desc, tmpfs_print }, 103 { &vop_pathconf_desc, tmpfs_pathconf }, 104 { &vop_islocked_desc, tmpfs_islocked }, 105 { &vop_advlock_desc, tmpfs_advlock }, 106 { &vop_bwrite_desc, tmpfs_bwrite }, 107 { &vop_getpages_desc, tmpfs_getpages }, 108 { &vop_putpages_desc, tmpfs_putpages }, 109 #if TMPFS_WHITEOUT 110 { &vop_whiteout_desc, tmpfs_whiteout }, 111 #endif 112 { NULL, NULL } 113 }; 114 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 115 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 116 117 /* 118 * tmpfs_lookup: lookup routine. 119 * 120 * Arguments: dvp (directory being searched), vpp (result), 121 * cnp (component name - path). 122 * 123 * => Caller holds a reference and lock on dvp. 124 * => We return looked-up vnode (vpp) locked, with a reference held. 125 */ 126 int 127 tmpfs_lookup(void *v) 128 { 129 struct vop_lookup_args /* { 130 struct vnode *a_dvp; 131 struct vnode **a_vpp; 132 struct componentname *a_cnp; 133 } */ *ap = v; 134 struct vnode *dvp = ap->a_dvp, **vpp = ap->a_vpp; 135 struct componentname *cnp = ap->a_cnp; 136 struct tmpfs_dirent *de; 137 struct tmpfs_node *dnode; 138 int error; 139 140 KASSERT(VOP_ISLOCKED(dvp)); 141 142 dnode = VP_TO_TMPFS_DIR(dvp); 143 *vpp = NULL; 144 145 /* Check accessibility of requested node as a first step. */ 146 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 147 if (error != 0) 148 goto out; 149 150 /* 151 * If requesting the last path component on a read-only file system 152 * with a write operation, deny it. 153 */ 154 if ((cnp->cn_flags & ISLASTCN) && 155 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 156 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 157 error = EROFS; 158 goto out; 159 } 160 161 /* 162 * Avoid doing a linear scan of the directory if the requested 163 * directory/name couple is already in the cache. 164 */ 165 error = cache_lookup(dvp, vpp, cnp); 166 if (error >= 0) 167 goto out; 168 169 /* We cannot be requesting the parent directory of the root node. */ 170 KASSERT(IMPLIES(dnode->tn_type == VDIR && 171 dnode->tn_spec.tn_dir.tn_parent == dnode, 172 !(cnp->cn_flags & ISDOTDOT))); 173 174 if (cnp->cn_flags & ISDOTDOT) { 175 VOP_UNLOCK(dvp); 176 177 /* Allocate a new vnode on the matching entry. */ 178 error = tmpfs_alloc_vp(dvp->v_mount, 179 dnode->tn_spec.tn_dir.tn_parent, vpp); 180 181 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 182 goto done; 183 184 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 185 if ((cnp->cn_flags & ISLASTCN) && 186 (cnp->cn_nameiop == RENAME)) { 187 error = EISDIR; 188 goto out; 189 } 190 vref(dvp); 191 *vpp = dvp; 192 error = 0; 193 goto done; 194 } 195 196 de = tmpfs_dir_lookup(dnode, cnp); 197 if (de == NULL || de->td_node == TMPFS_NODE_WHITEOUT) { 198 /* 199 * The entry was not found in the directory. This is valid 200 * if we are creating or renaming an entry and are working 201 * on the last component of the path name. 202 */ 203 if ((cnp->cn_flags & ISLASTCN) && (cnp->cn_nameiop == CREATE || 204 cnp->cn_nameiop == RENAME)) { 205 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 206 if (error) { 207 goto out; 208 } 209 error = EJUSTRETURN; 210 } else { 211 error = ENOENT; 212 } 213 if (de) { 214 KASSERT(de->td_node == TMPFS_NODE_WHITEOUT); 215 cnp->cn_flags |= ISWHITEOUT; 216 } 217 } else { 218 struct tmpfs_node *tnode = de->td_node; 219 220 /* 221 * If we are not at the last path component and found a 222 * non-directory or non-link entry (which may itself be 223 * pointing to a directory), raise an error. 224 */ 225 if ((tnode->tn_type != VDIR && tnode->tn_type != VLNK) && 226 (cnp->cn_flags & ISLASTCN) == 0) { 227 error = ENOTDIR; 228 goto out; 229 } 230 231 /* Check permissions. */ 232 if ((cnp->cn_flags & ISLASTCN) && (cnp->cn_nameiop == DELETE || 233 cnp->cn_nameiop == RENAME)) { 234 kauth_action_t action = 0; 235 236 /* This is the file-system's decision. */ 237 if ((dnode->tn_mode & S_ISTXT) != 0 && 238 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 239 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 240 error = EPERM; 241 else 242 error = 0; 243 244 /* Only bother if we are not already failing it. */ 245 if (!error) { 246 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 247 } 248 249 if (cnp->cn_nameiop == DELETE) { 250 action |= KAUTH_VNODE_DELETE; 251 } else { 252 KASSERT(cnp->cn_nameiop == RENAME); 253 action |= KAUTH_VNODE_RENAME; 254 } 255 error = kauth_authorize_vnode(cnp->cn_cred, 256 action, *vpp, dvp, error); 257 if (error) { 258 goto out; 259 } 260 } 261 /* Allocate a new vnode on the matching entry. */ 262 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 263 } 264 done: 265 /* 266 * Store the result of this lookup in the cache. Avoid this if the 267 * request was for creation, as it does not improve timings on 268 * emprical tests. 269 */ 270 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 271 (cnp->cn_flags & ISDOTDOT) == 0) 272 cache_enter(dvp, *vpp, cnp); 273 274 out: 275 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 276 KASSERT(VOP_ISLOCKED(dvp)); 277 278 return error; 279 } 280 281 int 282 tmpfs_create(void *v) 283 { 284 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 285 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 286 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 287 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 288 289 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 290 291 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 292 } 293 /* --------------------------------------------------------------------- */ 294 295 int 296 tmpfs_mknod(void *v) 297 { 298 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 299 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 300 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 301 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 302 303 if (vap->va_type != VBLK && vap->va_type != VCHR && 304 vap->va_type != VFIFO) { 305 vput(dvp); 306 return EINVAL; 307 } 308 309 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 310 } 311 312 /* --------------------------------------------------------------------- */ 313 314 int 315 tmpfs_open(void *v) 316 { 317 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 318 int mode = ((struct vop_open_args *)v)->a_mode; 319 320 int error; 321 struct tmpfs_node *node; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 node = VP_TO_TMPFS_NODE(vp); 326 327 /* The file is still active but all its names have been removed 328 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 329 * it is about to die. */ 330 if (node->tn_links < 1) { 331 error = ENOENT; 332 goto out; 333 } 334 335 /* If the file is marked append-only, deny write requests. */ 336 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 337 error = EPERM; 338 else 339 error = 0; 340 341 out: 342 KASSERT(VOP_ISLOCKED(vp)); 343 344 return error; 345 } 346 347 /* --------------------------------------------------------------------- */ 348 349 int 350 tmpfs_close(void *v) 351 { 352 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 353 354 struct tmpfs_node *node; 355 356 KASSERT(VOP_ISLOCKED(vp)); 357 358 node = VP_TO_TMPFS_NODE(vp); 359 360 if (node->tn_links > 0) { 361 /* Update node times. No need to do it if the node has 362 * been deleted, because it will vanish after we return. */ 363 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 364 } 365 366 return 0; 367 } 368 369 /* --------------------------------------------------------------------- */ 370 371 static int 372 tmpfs_check_possible(struct vnode *vp, struct tmpfs_node *node, mode_t mode) 373 { 374 int error = 0; 375 376 switch (vp->v_type) { 377 case VDIR: 378 /* FALLTHROUGH */ 379 case VLNK: 380 /* FALLTHROUGH */ 381 case VREG: 382 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 383 error = EROFS; 384 goto out; 385 } 386 break; 387 388 case VBLK: 389 /* FALLTHROUGH */ 390 case VCHR: 391 /* FALLTHROUGH */ 392 case VSOCK: 393 /* FALLTHROUGH */ 394 case VFIFO: 395 break; 396 397 default: 398 error = EINVAL; 399 goto out; 400 } 401 402 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 403 error = EPERM; 404 goto out; 405 } 406 407 out: 408 return error; 409 } 410 411 static int 412 tmpfs_check_permitted(struct vnode *vp, struct tmpfs_node *node, mode_t mode, 413 kauth_cred_t cred) 414 { 415 416 return genfs_can_access(vp->v_type, node->tn_mode, node->tn_uid, 417 node->tn_gid, mode, cred); 418 } 419 420 int 421 tmpfs_access(void *v) 422 { 423 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 424 int mode = ((struct vop_access_args *)v)->a_mode; 425 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 426 427 int error; 428 struct tmpfs_node *node; 429 430 KASSERT(VOP_ISLOCKED(vp)); 431 432 node = VP_TO_TMPFS_NODE(vp); 433 434 error = tmpfs_check_possible(vp, node, mode); 435 if (error) 436 goto out; 437 438 error = tmpfs_check_permitted(vp, node, mode, cred); 439 440 error = kauth_authorize_vnode(cred, kauth_mode_to_action(mode), vp, 441 NULL, error); 442 443 out: 444 KASSERT(VOP_ISLOCKED(vp)); 445 446 return error; 447 } 448 449 /* --------------------------------------------------------------------- */ 450 451 int 452 tmpfs_getattr(void *v) 453 { 454 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 455 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 456 457 struct tmpfs_node *node; 458 459 node = VP_TO_TMPFS_NODE(vp); 460 461 vattr_null(vap); 462 463 tmpfs_itimes(vp, NULL, NULL, NULL); 464 465 vap->va_type = vp->v_type; 466 vap->va_mode = node->tn_mode; 467 vap->va_nlink = node->tn_links; 468 vap->va_uid = node->tn_uid; 469 vap->va_gid = node->tn_gid; 470 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 471 vap->va_fileid = node->tn_id; 472 vap->va_size = node->tn_size; 473 vap->va_blocksize = PAGE_SIZE; 474 vap->va_atime = node->tn_atime; 475 vap->va_mtime = node->tn_mtime; 476 vap->va_ctime = node->tn_ctime; 477 vap->va_birthtime = node->tn_birthtime; 478 vap->va_gen = node->tn_gen; 479 vap->va_flags = node->tn_flags; 480 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 481 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 482 vap->va_bytes = round_page(node->tn_size); 483 vap->va_filerev = VNOVAL; 484 vap->va_vaflags = 0; 485 vap->va_spare = VNOVAL; /* XXX */ 486 487 return 0; 488 } 489 490 /* --------------------------------------------------------------------- */ 491 492 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 493 /* XXX Should this operation be atomic? I think it should, but code in 494 * XXX other places (e.g., ufs) doesn't seem to be... */ 495 int 496 tmpfs_setattr(void *v) 497 { 498 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 499 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 500 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 501 struct lwp *l = curlwp; 502 503 int error; 504 505 KASSERT(VOP_ISLOCKED(vp)); 506 507 error = 0; 508 509 /* Abort if any unsettable attribute is given. */ 510 if (vap->va_type != VNON || 511 vap->va_nlink != VNOVAL || 512 vap->va_fsid != VNOVAL || 513 vap->va_fileid != VNOVAL || 514 vap->va_blocksize != VNOVAL || 515 GOODTIME(&vap->va_ctime) || 516 vap->va_gen != VNOVAL || 517 vap->va_rdev != VNOVAL || 518 vap->va_bytes != VNOVAL) 519 error = EINVAL; 520 521 if (error == 0 && (vap->va_flags != VNOVAL)) 522 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 523 524 if (error == 0 && (vap->va_size != VNOVAL)) 525 error = tmpfs_chsize(vp, vap->va_size, cred, l); 526 527 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 528 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 529 530 if (error == 0 && (vap->va_mode != VNOVAL)) 531 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 532 533 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 534 || GOODTIME(&vap->va_birthtime))) 535 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 536 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 537 return 0; 538 539 /* Update the node times. We give preference to the error codes 540 * generated by this function rather than the ones that may arise 541 * from tmpfs_update. */ 542 tmpfs_update(vp, NULL, NULL, NULL, 0); 543 544 KASSERT(VOP_ISLOCKED(vp)); 545 546 return error; 547 } 548 549 /* --------------------------------------------------------------------- */ 550 551 int 552 tmpfs_read(void *v) 553 { 554 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 555 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 556 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 557 558 int error; 559 struct tmpfs_node *node; 560 struct uvm_object *uobj; 561 562 KASSERT(VOP_ISLOCKED(vp)); 563 564 node = VP_TO_TMPFS_NODE(vp); 565 566 if (vp->v_type != VREG) { 567 error = EISDIR; 568 goto out; 569 } 570 571 if (uio->uio_offset < 0) { 572 error = EINVAL; 573 goto out; 574 } 575 576 node->tn_status |= TMPFS_NODE_ACCESSED; 577 578 uobj = node->tn_spec.tn_reg.tn_aobj; 579 error = 0; 580 while (error == 0 && uio->uio_resid > 0) { 581 vsize_t len; 582 583 if (node->tn_size <= uio->uio_offset) 584 break; 585 586 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 587 if (len == 0) 588 break; 589 590 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 591 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 592 } 593 594 out: 595 KASSERT(VOP_ISLOCKED(vp)); 596 597 return error; 598 } 599 600 /* --------------------------------------------------------------------- */ 601 602 int 603 tmpfs_write(void *v) 604 { 605 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 606 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 607 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 608 609 bool extended; 610 int error; 611 off_t oldsize; 612 struct tmpfs_node *node; 613 struct uvm_object *uobj; 614 615 KASSERT(VOP_ISLOCKED(vp)); 616 617 node = VP_TO_TMPFS_NODE(vp); 618 oldsize = node->tn_size; 619 620 if (uio->uio_offset < 0 || vp->v_type != VREG) { 621 error = EINVAL; 622 goto out; 623 } 624 625 if (uio->uio_resid == 0) { 626 error = 0; 627 goto out; 628 } 629 630 if (ioflag & IO_APPEND) 631 uio->uio_offset = node->tn_size; 632 633 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 634 if (extended) { 635 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 636 if (error != 0) 637 goto out; 638 } 639 640 uobj = node->tn_spec.tn_reg.tn_aobj; 641 error = 0; 642 while (error == 0 && uio->uio_resid > 0) { 643 vsize_t len; 644 645 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 646 if (len == 0) 647 break; 648 649 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 650 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 651 } 652 653 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 654 (extended ? TMPFS_NODE_CHANGED : 0); 655 656 if (error != 0) 657 (void)tmpfs_reg_resize(vp, oldsize); 658 659 VN_KNOTE(vp, NOTE_WRITE); 660 661 out: 662 KASSERT(VOP_ISLOCKED(vp)); 663 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 664 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 665 666 return error; 667 } 668 669 /* --------------------------------------------------------------------- */ 670 671 int 672 tmpfs_fsync(void *v) 673 { 674 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 675 676 KASSERT(VOP_ISLOCKED(vp)); 677 678 tmpfs_update(vp, NULL, NULL, NULL, 0); 679 680 return 0; 681 } 682 683 /* --------------------------------------------------------------------- */ 684 685 int 686 tmpfs_remove(void *v) 687 { 688 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 689 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 690 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 691 692 int error; 693 struct tmpfs_dirent *de; 694 struct tmpfs_mount *tmp; 695 struct tmpfs_node *dnode; 696 struct tmpfs_node *node; 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 } 705 706 dnode = VP_TO_TMPFS_DIR(dvp); 707 node = VP_TO_TMPFS_NODE(vp); 708 tmp = VFS_TO_TMPFS(vp->v_mount); 709 de = tmpfs_dir_lookup(dnode, cnp); 710 KASSERT(de); 711 KASSERT(de->td_node == node); 712 713 /* Files marked as immutable or append-only cannot be deleted. */ 714 if (node->tn_flags & (IMMUTABLE | APPEND)) { 715 error = EPERM; 716 goto out; 717 } 718 719 /* Remove the entry from the directory; as it is a file, we do not 720 * have to change the number of hard links of the directory. */ 721 tmpfs_dir_detach(dvp, de); 722 723 /* Free the directory entry we just deleted. Note that the node 724 * referred by it will not be removed until the vnode is really 725 * reclaimed. */ 726 tmpfs_free_dirent(tmp, de, true); 727 728 error = 0; 729 730 out: 731 vput(vp); 732 if (dvp == vp) 733 vrele(dvp); 734 else 735 vput(dvp); 736 737 return error; 738 } 739 740 /* --------------------------------------------------------------------- */ 741 742 int 743 tmpfs_link(void *v) 744 { 745 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 746 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 747 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 748 749 int error; 750 struct tmpfs_dirent *de; 751 struct tmpfs_node *dnode; 752 struct tmpfs_node *node; 753 754 KASSERT(VOP_ISLOCKED(dvp)); 755 KASSERT(dvp != vp); /* XXX When can this be false? */ 756 757 dnode = VP_TO_TMPFS_DIR(dvp); 758 node = VP_TO_TMPFS_NODE(vp); 759 760 /* Lock vp because we will need to run tmpfs_update over it, which 761 * needs the vnode to be locked. */ 762 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 763 764 /* XXX: Why aren't the following two tests done by the caller? */ 765 766 /* Hard links of directories are forbidden. */ 767 if (vp->v_type == VDIR) { 768 error = EPERM; 769 goto out; 770 } 771 772 /* Cannot create cross-device links. */ 773 if (dvp->v_mount != vp->v_mount) { 774 error = EXDEV; 775 goto out; 776 } 777 778 /* Ensure that we do not overflow the maximum number of links imposed 779 * by the system. */ 780 KASSERT(node->tn_links <= LINK_MAX); 781 if (node->tn_links == LINK_MAX) { 782 error = EMLINK; 783 goto out; 784 } 785 786 /* We cannot create links of files marked immutable or append-only. */ 787 if (node->tn_flags & (IMMUTABLE | APPEND)) { 788 error = EPERM; 789 goto out; 790 } 791 792 /* Allocate a new directory entry to represent the node. */ 793 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 794 cnp->cn_nameptr, cnp->cn_namelen, &de); 795 if (error != 0) 796 goto out; 797 798 /* Insert the new directory entry into the appropriate directory. */ 799 tmpfs_dir_attach(dvp, de); 800 801 /* vp link count has changed, so update node times. */ 802 node->tn_status |= TMPFS_NODE_CHANGED; 803 tmpfs_update(vp, NULL, NULL, NULL, 0); 804 805 error = 0; 806 807 out: 808 VOP_UNLOCK(vp); 809 vput(dvp); 810 811 return error; 812 } 813 814 /* 815 * tmpfs_rename: rename routine. 816 * 817 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 818 * and tvp (to-leaf), if exists (NULL if not). 819 * 820 * => Caller holds a reference on fdvp and fvp, they are unlocked. 821 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 822 * 823 * => Both tdvp and tvp are referenced and locked. It is our responsibility 824 * to release the references and unlock them (or destroy). 825 */ 826 int 827 tmpfs_rename(void *v) 828 { 829 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 830 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 831 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 832 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 833 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 834 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 835 836 char *newname; 837 int error; 838 struct tmpfs_dirent *de, *de2; 839 struct tmpfs_mount *tmp; 840 struct tmpfs_node *fdnode; 841 struct tmpfs_node *fnode; 842 struct tmpfs_node *tnode; 843 struct tmpfs_node *tdnode; 844 size_t namelen; 845 846 KASSERT(VOP_ISLOCKED(tdvp)); 847 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 848 849 newname = NULL; 850 namelen = 0; 851 tmp = NULL; 852 853 /* Disallow cross-device renames. */ 854 if (fvp->v_mount != tdvp->v_mount || 855 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 856 error = EXDEV; 857 goto out_unlocked; 858 } 859 860 fnode = VP_TO_TMPFS_NODE(fvp); 861 fdnode = VP_TO_TMPFS_DIR(fdvp); 862 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 863 tdnode = VP_TO_TMPFS_DIR(tdvp); 864 tmp = VFS_TO_TMPFS(tdvp->v_mount); 865 866 if (fdvp == tvp) { 867 error = 0; 868 goto out_unlocked; 869 } 870 871 /* Allocate memory, if necessary, for a new name. */ 872 namelen = tcnp->cn_namelen; 873 if (tmpfs_strname_neqlen(fcnp, tcnp)) { 874 newname = tmpfs_strname_alloc(tmp, namelen); 875 if (newname == NULL) { 876 error = ENOSPC; 877 goto out_unlocked; 878 } 879 } 880 881 /* If we need to move the directory between entries, lock the 882 * source so that we can safely operate on it. */ 883 884 /* XXX: this is a potential locking order violation! */ 885 if (fdnode != tdnode) { 886 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 887 } 888 889 /* 890 * If the node we were renaming has scarpered, just give up. 891 */ 892 de = tmpfs_dir_lookup(fdnode, fcnp); 893 if (de == NULL || de->td_node != fnode) { 894 error = ENOENT; 895 goto out; 896 } 897 898 /* If source and target is the same vnode, remove the source link. */ 899 if (fvp == tvp) { 900 /* 901 * Detach and free the directory entry. Drops the link 902 * count on the node. 903 */ 904 tmpfs_dir_detach(fdvp, de); 905 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 906 VN_KNOTE(fdvp, NOTE_WRITE); 907 goto out_ok; 908 } 909 910 /* If replacing an existing entry, ensure we can do the operation. */ 911 if (tvp != NULL) { 912 KASSERT(tnode != NULL); 913 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 914 if (tnode->tn_size > 0) { 915 error = ENOTEMPTY; 916 goto out; 917 } 918 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 919 error = ENOTDIR; 920 goto out; 921 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 922 error = EISDIR; 923 goto out; 924 } else { 925 KASSERT(fnode->tn_type != VDIR && 926 tnode->tn_type != VDIR); 927 } 928 } 929 930 /* If the node is being moved to another directory, we have to do 931 * the move. */ 932 if (fdnode != tdnode) { 933 /* In case we are moving a directory, we have to adjust its 934 * parent to point to the new parent. */ 935 if (de->td_node->tn_type == VDIR) { 936 struct tmpfs_node *n; 937 938 /* Ensure the target directory is not a child of the 939 * directory being moved. Otherwise, we'd end up 940 * with stale nodes. */ 941 n = tdnode; 942 while (n != n->tn_spec.tn_dir.tn_parent) { 943 if (n == fnode) { 944 error = EINVAL; 945 goto out; 946 } 947 n = n->tn_spec.tn_dir.tn_parent; 948 } 949 950 /* Adjust the parent pointer. */ 951 TMPFS_VALIDATE_DIR(fnode); 952 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 953 954 /* As a result of changing the target of the '..' 955 * entry, the link count of the source and target 956 * directories has to be adjusted. */ 957 fdnode->tn_links--; 958 tdnode->tn_links++; 959 } 960 961 /* Do the move: just remove the entry from the source directory 962 * and insert it into the target one. */ 963 tmpfs_dir_detach(fdvp, de); 964 tmpfs_dir_attach(tdvp, de); 965 966 /* Notify listeners of fdvp about the change in the directory. 967 * We can do it at this point because we aren't touching fdvp 968 * any more below. */ 969 VN_KNOTE(fdvp, NOTE_WRITE); 970 } 971 972 /* If we are overwriting an entry, we have to remove the old one 973 * from the target directory. */ 974 if (tvp != NULL) { 975 KASSERT(tnode != NULL); 976 977 /* Remove the old entry from the target directory. 978 * Note! This relies on tmpfs_dir_attach() putting the new 979 * node on the end of the target's node list. */ 980 de2 = tmpfs_dir_lookup(tdnode, tcnp); 981 KASSERT(de2 != NULL); 982 KASSERT(de2->td_node == tnode); 983 tmpfs_dir_detach(tdvp, de2); 984 985 /* Free the directory entry we just deleted. Note that the 986 * node referred by it will not be removed until the vnode is 987 * really reclaimed. */ 988 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 989 } 990 991 /* If the name has changed, we need to make it effective by changing 992 * it in the directory entry. */ 993 if (newname != NULL) { 994 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 995 KASSERT(tcnp->cn_namelen < 0xffff); 996 997 tmpfs_strname_free(tmp, de->td_name, de->td_namelen); 998 de->td_namelen = (uint16_t)namelen; 999 memcpy(newname, tcnp->cn_nameptr, namelen); 1000 de->td_name = newname; 1001 newname = NULL; 1002 1003 fnode->tn_status |= TMPFS_NODE_CHANGED; 1004 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1005 } 1006 out_ok: 1007 /* Notify listeners of tdvp about the change in the directory (either 1008 * because a new entry was added or because one was removed) and 1009 * listeners of fvp about the rename. */ 1010 VN_KNOTE(tdvp, NOTE_WRITE); 1011 VN_KNOTE(fvp, NOTE_RENAME); 1012 1013 error = 0; 1014 1015 out: 1016 if (fdnode != tdnode) 1017 VOP_UNLOCK(fdvp); 1018 1019 out_unlocked: 1020 /* Release target nodes. */ 1021 if (tdvp == tvp) 1022 vrele(tdvp); 1023 else 1024 vput(tdvp); 1025 if (tvp != NULL) 1026 vput(tvp); 1027 1028 /* Release source nodes. */ 1029 vrele(fdvp); 1030 vrele(fvp); 1031 1032 if (newname != NULL) { 1033 tmpfs_strname_free(tmp, newname, namelen); 1034 } 1035 return error; 1036 } 1037 1038 /* --------------------------------------------------------------------- */ 1039 1040 int 1041 tmpfs_mkdir(void *v) 1042 { 1043 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1044 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1045 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1046 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1047 1048 KASSERT(vap->va_type == VDIR); 1049 1050 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1051 } 1052 1053 /* --------------------------------------------------------------------- */ 1054 1055 int 1056 tmpfs_rmdir(void *v) 1057 { 1058 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1059 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1060 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1061 1062 int error; 1063 struct tmpfs_dirent *de; 1064 struct tmpfs_mount *tmp; 1065 struct tmpfs_node *dnode; 1066 struct tmpfs_node *node; 1067 1068 KASSERT(VOP_ISLOCKED(dvp)); 1069 KASSERT(VOP_ISLOCKED(vp)); 1070 1071 tmp = VFS_TO_TMPFS(dvp->v_mount); 1072 dnode = VP_TO_TMPFS_DIR(dvp); 1073 node = VP_TO_TMPFS_DIR(vp); 1074 error = 0; 1075 1076 /* Directories with more than two entries ('.' and '..') cannot be 1077 * removed. */ 1078 if (node->tn_size > 0) { 1079 error = ENOTEMPTY; 1080 goto out; 1081 } 1082 1083 /* This invariant holds only if we are not trying to remove "..". 1084 * We checked for that above so this is safe now. */ 1085 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1086 1087 /* Get the directory entry associated with node (vp). */ 1088 de = tmpfs_dir_lookup(dnode, cnp); 1089 KASSERT(de); 1090 KASSERT(de->td_node == node); 1091 1092 /* Check flags to see if we are allowed to remove the directory. */ 1093 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1094 error = EPERM; 1095 goto out; 1096 } 1097 1098 /* Detach the directory entry from the directory (dnode). */ 1099 tmpfs_dir_detach(dvp, de); 1100 1101 node->tn_links--; 1102 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1103 TMPFS_NODE_MODIFIED; 1104 node->tn_spec.tn_dir.tn_parent->tn_links--; 1105 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1106 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1107 1108 /* Release the parent. */ 1109 cache_purge(dvp); /* XXX Is this needed? */ 1110 1111 /* Free the directory entry we just deleted. Note that the node 1112 * referred by it will not be removed until the vnode is really 1113 * reclaimed. */ 1114 tmpfs_free_dirent(tmp, de, true); 1115 1116 KASSERT(node->tn_links == 0); 1117 out: 1118 /* Release the nodes. */ 1119 vput(dvp); 1120 vput(vp); 1121 1122 return error; 1123 } 1124 1125 /* --------------------------------------------------------------------- */ 1126 1127 int 1128 tmpfs_symlink(void *v) 1129 { 1130 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1131 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1132 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1133 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1134 char *target = ((struct vop_symlink_args *)v)->a_target; 1135 1136 KASSERT(vap->va_type == VLNK); 1137 1138 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1139 } 1140 1141 /* --------------------------------------------------------------------- */ 1142 1143 int 1144 tmpfs_readdir(void *v) 1145 { 1146 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1147 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1148 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1149 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1150 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1151 1152 int error; 1153 off_t startoff; 1154 off_t cnt; 1155 struct tmpfs_node *node; 1156 1157 KASSERT(VOP_ISLOCKED(vp)); 1158 1159 /* This operation only makes sense on directory nodes. */ 1160 if (vp->v_type != VDIR) { 1161 error = ENOTDIR; 1162 goto out; 1163 } 1164 1165 node = VP_TO_TMPFS_DIR(vp); 1166 1167 startoff = uio->uio_offset; 1168 1169 cnt = 0; 1170 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1171 error = tmpfs_dir_getdotdent(node, uio); 1172 if (error == -1) { 1173 error = 0; 1174 goto outok; 1175 } else if (error != 0) 1176 goto outok; 1177 cnt++; 1178 } 1179 1180 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1181 error = tmpfs_dir_getdotdotdent(node, uio); 1182 if (error == -1) { 1183 error = 0; 1184 goto outok; 1185 } else if (error != 0) 1186 goto outok; 1187 cnt++; 1188 } 1189 1190 error = tmpfs_dir_getdents(node, uio, &cnt); 1191 if (error == -1) 1192 error = 0; 1193 KASSERT(error >= 0); 1194 1195 outok: 1196 /* This label assumes that startoff has been 1197 * initialized. If the compiler didn't spit out warnings, we'd 1198 * simply make this one be 'out' and drop 'outok'. */ 1199 1200 if (eofflag != NULL) 1201 *eofflag = 1202 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1203 1204 /* Update NFS-related variables. */ 1205 if (error == 0 && cookies != NULL && ncookies != NULL) { 1206 off_t i; 1207 off_t off = startoff; 1208 struct tmpfs_dirent *de = NULL; 1209 1210 *ncookies = cnt; 1211 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1212 1213 for (i = 0; i < cnt; i++) { 1214 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1215 if (off == TMPFS_DIRCOOKIE_DOT) { 1216 off = TMPFS_DIRCOOKIE_DOTDOT; 1217 } else { 1218 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1219 de = TAILQ_FIRST(&node->tn_spec. 1220 tn_dir.tn_dir); 1221 } else if (de != NULL) { 1222 de = TAILQ_NEXT(de, td_entries); 1223 } else { 1224 de = tmpfs_dir_lookupbycookie(node, 1225 off); 1226 KASSERT(de != NULL); 1227 de = TAILQ_NEXT(de, td_entries); 1228 } 1229 if (de == NULL) { 1230 off = TMPFS_DIRCOOKIE_EOF; 1231 } else { 1232 off = tmpfs_dircookie(de); 1233 } 1234 } 1235 1236 (*cookies)[i] = off; 1237 } 1238 KASSERT(uio->uio_offset == off); 1239 } 1240 1241 out: 1242 KASSERT(VOP_ISLOCKED(vp)); 1243 1244 return error; 1245 } 1246 1247 /* --------------------------------------------------------------------- */ 1248 1249 int 1250 tmpfs_readlink(void *v) 1251 { 1252 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1253 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1254 1255 int error; 1256 struct tmpfs_node *node; 1257 1258 KASSERT(VOP_ISLOCKED(vp)); 1259 KASSERT(uio->uio_offset == 0); 1260 KASSERT(vp->v_type == VLNK); 1261 1262 node = VP_TO_TMPFS_NODE(vp); 1263 1264 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1265 MIN(node->tn_size, uio->uio_resid), uio); 1266 node->tn_status |= TMPFS_NODE_ACCESSED; 1267 1268 KASSERT(VOP_ISLOCKED(vp)); 1269 1270 return error; 1271 } 1272 1273 /* --------------------------------------------------------------------- */ 1274 1275 int 1276 tmpfs_inactive(void *v) 1277 { 1278 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1279 1280 struct tmpfs_node *node; 1281 1282 KASSERT(VOP_ISLOCKED(vp)); 1283 1284 node = VP_TO_TMPFS_NODE(vp); 1285 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1286 VOP_UNLOCK(vp); 1287 1288 return 0; 1289 } 1290 1291 /* --------------------------------------------------------------------- */ 1292 1293 int 1294 tmpfs_reclaim(void *v) 1295 { 1296 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1297 1298 struct tmpfs_mount *tmp; 1299 struct tmpfs_node *node; 1300 1301 node = VP_TO_TMPFS_NODE(vp); 1302 tmp = VFS_TO_TMPFS(vp->v_mount); 1303 1304 cache_purge(vp); 1305 tmpfs_free_vp(vp); 1306 1307 /* If the node referenced by this vnode was deleted by the user, 1308 * we must free its associated data structures (now that the vnode 1309 * is being reclaimed). */ 1310 if (node->tn_links == 0) 1311 tmpfs_free_node(tmp, node); 1312 1313 KASSERT(vp->v_data == NULL); 1314 1315 return 0; 1316 } 1317 1318 /* --------------------------------------------------------------------- */ 1319 1320 int 1321 tmpfs_print(void *v) 1322 { 1323 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1324 1325 struct tmpfs_node *node; 1326 1327 node = VP_TO_TMPFS_NODE(vp); 1328 1329 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1330 node, node->tn_flags, node->tn_links); 1331 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1332 ", status 0x%x", 1333 node->tn_mode, node->tn_uid, node->tn_gid, 1334 (uintmax_t)node->tn_size, node->tn_status); 1335 if (vp->v_type == VFIFO) 1336 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1337 printf("\n"); 1338 1339 return 0; 1340 } 1341 1342 /* --------------------------------------------------------------------- */ 1343 1344 int 1345 tmpfs_pathconf(void *v) 1346 { 1347 int name = ((struct vop_pathconf_args *)v)->a_name; 1348 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1349 1350 int error; 1351 1352 error = 0; 1353 1354 switch (name) { 1355 case _PC_LINK_MAX: 1356 *retval = LINK_MAX; 1357 break; 1358 1359 case _PC_NAME_MAX: 1360 *retval = NAME_MAX; 1361 break; 1362 1363 case _PC_PATH_MAX: 1364 *retval = PATH_MAX; 1365 break; 1366 1367 case _PC_PIPE_BUF: 1368 *retval = PIPE_BUF; 1369 break; 1370 1371 case _PC_CHOWN_RESTRICTED: 1372 *retval = 1; 1373 break; 1374 1375 case _PC_NO_TRUNC: 1376 *retval = 1; 1377 break; 1378 1379 case _PC_SYNC_IO: 1380 *retval = 1; 1381 break; 1382 1383 case _PC_FILESIZEBITS: 1384 *retval = 0; /* XXX Don't know which value should I return. */ 1385 break; 1386 1387 default: 1388 error = EINVAL; 1389 } 1390 1391 return error; 1392 } 1393 1394 /* --------------------------------------------------------------------- */ 1395 1396 int 1397 tmpfs_advlock(void *v) 1398 { 1399 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1400 1401 struct tmpfs_node *node; 1402 1403 node = VP_TO_TMPFS_NODE(vp); 1404 1405 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1406 } 1407 1408 /* --------------------------------------------------------------------- */ 1409 1410 int 1411 tmpfs_getpages(void *v) 1412 { 1413 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1414 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1415 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1416 int *count = ((struct vop_getpages_args *)v)->a_count; 1417 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1418 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1419 int advice = ((struct vop_getpages_args *)v)->a_advice; 1420 int flags = ((struct vop_getpages_args *)v)->a_flags; 1421 1422 int error; 1423 int i; 1424 struct tmpfs_node *node; 1425 struct uvm_object *uobj; 1426 int npages = *count; 1427 1428 KASSERT(vp->v_type == VREG); 1429 KASSERT(mutex_owned(&vp->v_interlock)); 1430 1431 node = VP_TO_TMPFS_NODE(vp); 1432 uobj = node->tn_spec.tn_reg.tn_aobj; 1433 1434 /* We currently don't rely on PGO_PASTEOF. */ 1435 1436 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1437 if ((flags & PGO_LOCKED) == 0) 1438 mutex_exit(&vp->v_interlock); 1439 return EINVAL; 1440 } 1441 1442 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1443 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1444 } 1445 1446 if ((flags & PGO_LOCKED) != 0) 1447 return EBUSY; 1448 1449 if ((flags & PGO_NOTIMESTAMP) == 0) { 1450 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1451 node->tn_status |= TMPFS_NODE_ACCESSED; 1452 1453 if ((access_type & VM_PROT_WRITE) != 0) 1454 node->tn_status |= TMPFS_NODE_MODIFIED; 1455 } 1456 1457 mutex_exit(&vp->v_interlock); 1458 1459 /* 1460 * Make sure that the array on which we will store the 1461 * gotten pages is clean. Otherwise uao_get (pointed to by 1462 * the pgo_get below) gets confused and does not return the 1463 * appropriate pages. 1464 * 1465 * XXX This shall be revisited when kern/32166 is addressed 1466 * because the loop to clean m[i] will most likely be redundant 1467 * as well as the PGO_ALLPAGES flag. 1468 */ 1469 if (m != NULL) 1470 for (i = 0; i < npages; i++) 1471 m[i] = NULL; 1472 mutex_enter(&uobj->vmobjlock); 1473 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1474 access_type, advice, flags | PGO_ALLPAGES); 1475 #if defined(DEBUG) 1476 { 1477 /* Make sure that all the pages we return are valid. */ 1478 int dbgi; 1479 if (error == 0 && m != NULL) 1480 for (dbgi = 0; dbgi < npages; dbgi++) 1481 KASSERT(m[dbgi] != NULL); 1482 } 1483 #endif 1484 1485 return error; 1486 } 1487 1488 /* --------------------------------------------------------------------- */ 1489 1490 int 1491 tmpfs_putpages(void *v) 1492 { 1493 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1494 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1495 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1496 int flags = ((struct vop_putpages_args *)v)->a_flags; 1497 1498 int error; 1499 struct tmpfs_node *node; 1500 struct uvm_object *uobj; 1501 1502 KASSERT(mutex_owned(&vp->v_interlock)); 1503 1504 node = VP_TO_TMPFS_NODE(vp); 1505 1506 if (vp->v_type != VREG) { 1507 mutex_exit(&vp->v_interlock); 1508 return 0; 1509 } 1510 1511 uobj = node->tn_spec.tn_reg.tn_aobj; 1512 mutex_exit(&vp->v_interlock); 1513 1514 mutex_enter(&uobj->vmobjlock); 1515 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1516 1517 /* XXX mtime */ 1518 1519 return error; 1520 } 1521 1522 /* --------------------------------------------------------------------- */ 1523 1524 #ifdef TMPFS_WHITEOUT 1525 int 1526 tmpfs_whiteout(void *v) 1527 { 1528 struct vnode *dvp = ((struct vop_whiteout_args *)v)->a_dvp; 1529 struct componentname *cnp = ((struct vop_whiteout_args *)v)->a_cnp; 1530 int flags = ((struct vop_whiteout_args *)v)->a_flags; 1531 struct tmpfs_mount *tmp = VFS_TO_TMPFS(dvp->v_mount); 1532 struct tmpfs_dirent *de; 1533 int error; 1534 1535 switch (flags) { 1536 case LOOKUP: 1537 break; 1538 case CREATE: 1539 error = tmpfs_alloc_dirent(tmp, TMPFS_NODE_WHITEOUT, 1540 cnp->cn_nameptr, cnp->cn_namelen, &de); 1541 if (error) 1542 return error; 1543 tmpfs_dir_attach(dvp, de); 1544 break; 1545 case DELETE: 1546 cnp->cn_flags &= ~DOWHITEOUT; /* when in doubt, cargo cult */ 1547 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), cnp); 1548 if (de == NULL) 1549 return ENOENT; 1550 tmpfs_dir_detach(dvp, de); 1551 tmpfs_free_dirent(tmp, de, true); 1552 break; 1553 } 1554 1555 return 0; 1556 } 1557 #endif 1558