1 /* $NetBSD: tmpfs_vnops.c,v 1.80 2011/05/10 00:34:26 matt 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 1.80 2011/05/10 00:34:26 matt 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 * tmpfs_link: create hard link. 742 */ 743 int 744 tmpfs_link(void *v) 745 { 746 struct vop_link_args /* { 747 struct vnode *a_dvp; 748 struct vnode *a_vp; 749 struct componentname *a_cnp; 750 } */ *ap = v; 751 struct vnode *dvp = ap->a_dvp; 752 struct vnode *vp = ap->a_vp; 753 struct componentname *cnp = ap->a_cnp;; 754 struct tmpfs_node *dnode, *node; 755 struct tmpfs_dirent *de; 756 int error; 757 758 KASSERT(dvp != vp); 759 KASSERT(VOP_ISLOCKED(dvp)); 760 KASSERT(vp->v_type != VDIR); 761 KASSERT(dvp->v_mount == vp->v_mount); 762 763 dnode = VP_TO_TMPFS_DIR(dvp); 764 node = VP_TO_TMPFS_NODE(vp); 765 766 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 767 768 /* Ensure that we do not overflow the maximum number of links imposed 769 * by the system. */ 770 KASSERT(node->tn_links <= LINK_MAX); 771 if (node->tn_links == LINK_MAX) { 772 error = EMLINK; 773 goto out; 774 } 775 776 /* We cannot create links of files marked immutable or append-only. */ 777 if (node->tn_flags & (IMMUTABLE | APPEND)) { 778 error = EPERM; 779 goto out; 780 } 781 782 /* Allocate a new directory entry to represent the node. */ 783 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 784 cnp->cn_nameptr, cnp->cn_namelen, &de); 785 if (error != 0) 786 goto out; 787 788 /* Insert the new directory entry into the appropriate directory. */ 789 tmpfs_dir_attach(dvp, de); 790 791 /* vp link count has changed, so update node times. */ 792 node->tn_status |= TMPFS_NODE_CHANGED; 793 tmpfs_update(vp, NULL, NULL, NULL, 0); 794 795 error = 0; 796 797 out: 798 VOP_UNLOCK(vp); 799 vput(dvp); 800 801 return error; 802 } 803 804 /* 805 * tmpfs_rename: rename routine. 806 * 807 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 808 * and tvp (to-leaf), if exists (NULL if not). 809 * 810 * => Caller holds a reference on fdvp and fvp, they are unlocked. 811 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 812 * 813 * => Both tdvp and tvp are referenced and locked. It is our responsibility 814 * to release the references and unlock them (or destroy). 815 */ 816 int 817 tmpfs_rename(void *v) 818 { 819 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 820 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 821 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 822 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 823 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 824 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 825 826 char *newname; 827 int error; 828 struct tmpfs_dirent *de, *de2; 829 struct tmpfs_mount *tmp; 830 struct tmpfs_node *fdnode; 831 struct tmpfs_node *fnode; 832 struct tmpfs_node *tnode; 833 struct tmpfs_node *tdnode; 834 size_t namelen; 835 836 KASSERT(VOP_ISLOCKED(tdvp)); 837 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 838 839 newname = NULL; 840 namelen = 0; 841 tmp = NULL; 842 843 /* Disallow cross-device renames. */ 844 if (fvp->v_mount != tdvp->v_mount || 845 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 846 error = EXDEV; 847 goto out_unlocked; 848 } 849 850 fnode = VP_TO_TMPFS_NODE(fvp); 851 fdnode = VP_TO_TMPFS_DIR(fdvp); 852 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 853 tdnode = VP_TO_TMPFS_DIR(tdvp); 854 tmp = VFS_TO_TMPFS(tdvp->v_mount); 855 856 if (fdvp == tvp) { 857 error = 0; 858 goto out_unlocked; 859 } 860 861 /* Allocate memory, if necessary, for a new name. */ 862 namelen = tcnp->cn_namelen; 863 if (tmpfs_strname_neqlen(fcnp, tcnp)) { 864 newname = tmpfs_strname_alloc(tmp, namelen); 865 if (newname == NULL) { 866 error = ENOSPC; 867 goto out_unlocked; 868 } 869 } 870 871 /* If we need to move the directory between entries, lock the 872 * source so that we can safely operate on it. */ 873 874 /* XXX: this is a potential locking order violation! */ 875 if (fdnode != tdnode) { 876 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 877 } 878 879 /* 880 * If the node we were renaming has scarpered, just give up. 881 */ 882 de = tmpfs_dir_lookup(fdnode, fcnp); 883 if (de == NULL || de->td_node != fnode) { 884 error = ENOENT; 885 goto out; 886 } 887 888 /* If source and target is the same vnode, remove the source link. */ 889 if (fvp == tvp) { 890 /* 891 * Detach and free the directory entry. Drops the link 892 * count on the node. 893 */ 894 tmpfs_dir_detach(fdvp, de); 895 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 896 VN_KNOTE(fdvp, NOTE_WRITE); 897 goto out_ok; 898 } 899 900 /* If replacing an existing entry, ensure we can do the operation. */ 901 if (tvp != NULL) { 902 KASSERT(tnode != NULL); 903 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 904 if (tnode->tn_size > 0) { 905 error = ENOTEMPTY; 906 goto out; 907 } 908 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 909 error = ENOTDIR; 910 goto out; 911 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 912 error = EISDIR; 913 goto out; 914 } else { 915 KASSERT(fnode->tn_type != VDIR && 916 tnode->tn_type != VDIR); 917 } 918 } 919 920 /* If the node is being moved to another directory, we have to do 921 * the move. */ 922 if (fdnode != tdnode) { 923 /* In case we are moving a directory, we have to adjust its 924 * parent to point to the new parent. */ 925 if (de->td_node->tn_type == VDIR) { 926 struct tmpfs_node *n; 927 928 /* Ensure the target directory is not a child of the 929 * directory being moved. Otherwise, we'd end up 930 * with stale nodes. */ 931 n = tdnode; 932 while (n != n->tn_spec.tn_dir.tn_parent) { 933 if (n == fnode) { 934 error = EINVAL; 935 goto out; 936 } 937 n = n->tn_spec.tn_dir.tn_parent; 938 } 939 940 /* Adjust the parent pointer. */ 941 TMPFS_VALIDATE_DIR(fnode); 942 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 943 944 /* As a result of changing the target of the '..' 945 * entry, the link count of the source and target 946 * directories has to be adjusted. */ 947 fdnode->tn_links--; 948 tdnode->tn_links++; 949 } 950 951 /* Do the move: just remove the entry from the source directory 952 * and insert it into the target one. */ 953 tmpfs_dir_detach(fdvp, de); 954 tmpfs_dir_attach(tdvp, de); 955 956 /* Notify listeners of fdvp about the change in the directory. 957 * We can do it at this point because we aren't touching fdvp 958 * any more below. */ 959 VN_KNOTE(fdvp, NOTE_WRITE); 960 } 961 962 /* If we are overwriting an entry, we have to remove the old one 963 * from the target directory. */ 964 if (tvp != NULL) { 965 KASSERT(tnode != NULL); 966 967 /* Remove the old entry from the target directory. 968 * Note! This relies on tmpfs_dir_attach() putting the new 969 * node on the end of the target's node list. */ 970 de2 = tmpfs_dir_lookup(tdnode, tcnp); 971 KASSERT(de2 != NULL); 972 KASSERT(de2->td_node == tnode); 973 tmpfs_dir_detach(tdvp, de2); 974 975 /* Free the directory entry we just deleted. Note that the 976 * node referred by it will not be removed until the vnode is 977 * really reclaimed. */ 978 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 979 } 980 981 /* If the name has changed, we need to make it effective by changing 982 * it in the directory entry. */ 983 if (newname != NULL) { 984 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 985 KASSERT(tcnp->cn_namelen < 0xffff); 986 987 tmpfs_strname_free(tmp, de->td_name, de->td_namelen); 988 de->td_namelen = (uint16_t)namelen; 989 memcpy(newname, tcnp->cn_nameptr, namelen); 990 de->td_name = newname; 991 newname = NULL; 992 993 fnode->tn_status |= TMPFS_NODE_CHANGED; 994 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 995 } 996 out_ok: 997 /* Notify listeners of tdvp about the change in the directory (either 998 * because a new entry was added or because one was removed) and 999 * listeners of fvp about the rename. */ 1000 VN_KNOTE(tdvp, NOTE_WRITE); 1001 VN_KNOTE(fvp, NOTE_RENAME); 1002 1003 error = 0; 1004 1005 out: 1006 if (fdnode != tdnode) 1007 VOP_UNLOCK(fdvp); 1008 1009 out_unlocked: 1010 /* Release target nodes. */ 1011 if (tdvp == tvp) 1012 vrele(tdvp); 1013 else 1014 vput(tdvp); 1015 if (tvp != NULL) 1016 vput(tvp); 1017 1018 /* Release source nodes. */ 1019 vrele(fdvp); 1020 vrele(fvp); 1021 1022 if (newname != NULL) { 1023 tmpfs_strname_free(tmp, newname, namelen); 1024 } 1025 return error; 1026 } 1027 1028 /* --------------------------------------------------------------------- */ 1029 1030 int 1031 tmpfs_mkdir(void *v) 1032 { 1033 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1034 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1035 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1036 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1037 1038 KASSERT(vap->va_type == VDIR); 1039 1040 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1041 } 1042 1043 /* --------------------------------------------------------------------- */ 1044 1045 int 1046 tmpfs_rmdir(void *v) 1047 { 1048 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1049 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1050 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1051 1052 int error; 1053 struct tmpfs_dirent *de; 1054 struct tmpfs_mount *tmp; 1055 struct tmpfs_node *dnode; 1056 struct tmpfs_node *node; 1057 1058 KASSERT(VOP_ISLOCKED(dvp)); 1059 KASSERT(VOP_ISLOCKED(vp)); 1060 1061 tmp = VFS_TO_TMPFS(dvp->v_mount); 1062 dnode = VP_TO_TMPFS_DIR(dvp); 1063 node = VP_TO_TMPFS_DIR(vp); 1064 error = 0; 1065 1066 /* Directories with more than two entries ('.' and '..') cannot be 1067 * removed. */ 1068 if (node->tn_size > 0) { 1069 error = ENOTEMPTY; 1070 goto out; 1071 } 1072 1073 /* This invariant holds only if we are not trying to remove "..". 1074 * We checked for that above so this is safe now. */ 1075 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1076 1077 /* Get the directory entry associated with node (vp). */ 1078 de = tmpfs_dir_lookup(dnode, cnp); 1079 KASSERT(de); 1080 KASSERT(de->td_node == node); 1081 1082 /* Check flags to see if we are allowed to remove the directory. */ 1083 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1084 error = EPERM; 1085 goto out; 1086 } 1087 1088 /* Detach the directory entry from the directory (dnode). */ 1089 tmpfs_dir_detach(dvp, de); 1090 1091 node->tn_links--; 1092 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1093 TMPFS_NODE_MODIFIED; 1094 node->tn_spec.tn_dir.tn_parent->tn_links--; 1095 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1096 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1097 1098 /* Release the parent. */ 1099 cache_purge(dvp); /* XXX Is this needed? */ 1100 1101 /* Free the directory entry we just deleted. Note that the node 1102 * referred by it will not be removed until the vnode is really 1103 * reclaimed. */ 1104 tmpfs_free_dirent(tmp, de, true); 1105 1106 KASSERT(node->tn_links == 0); 1107 out: 1108 /* Release the nodes. */ 1109 vput(dvp); 1110 vput(vp); 1111 1112 return error; 1113 } 1114 1115 /* --------------------------------------------------------------------- */ 1116 1117 int 1118 tmpfs_symlink(void *v) 1119 { 1120 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1121 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1122 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1123 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1124 char *target = ((struct vop_symlink_args *)v)->a_target; 1125 1126 KASSERT(vap->va_type == VLNK); 1127 1128 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1129 } 1130 1131 /* --------------------------------------------------------------------- */ 1132 1133 int 1134 tmpfs_readdir(void *v) 1135 { 1136 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1137 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1138 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1139 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1140 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1141 1142 int error; 1143 off_t startoff; 1144 off_t cnt; 1145 struct tmpfs_node *node; 1146 1147 KASSERT(VOP_ISLOCKED(vp)); 1148 1149 /* This operation only makes sense on directory nodes. */ 1150 if (vp->v_type != VDIR) { 1151 error = ENOTDIR; 1152 goto out; 1153 } 1154 1155 node = VP_TO_TMPFS_DIR(vp); 1156 1157 startoff = uio->uio_offset; 1158 1159 cnt = 0; 1160 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1161 error = tmpfs_dir_getdotdent(node, uio); 1162 if (error == -1) { 1163 error = 0; 1164 goto outok; 1165 } else if (error != 0) 1166 goto outok; 1167 cnt++; 1168 } 1169 1170 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1171 error = tmpfs_dir_getdotdotdent(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 error = tmpfs_dir_getdents(node, uio, &cnt); 1181 if (error == -1) 1182 error = 0; 1183 KASSERT(error >= 0); 1184 1185 outok: 1186 /* This label assumes that startoff has been 1187 * initialized. If the compiler didn't spit out warnings, we'd 1188 * simply make this one be 'out' and drop 'outok'. */ 1189 1190 if (eofflag != NULL) 1191 *eofflag = 1192 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1193 1194 /* Update NFS-related variables. */ 1195 if (error == 0 && cookies != NULL && ncookies != NULL) { 1196 off_t i; 1197 off_t off = startoff; 1198 struct tmpfs_dirent *de = NULL; 1199 1200 *ncookies = cnt; 1201 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1202 1203 for (i = 0; i < cnt; i++) { 1204 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1205 if (off == TMPFS_DIRCOOKIE_DOT) { 1206 off = TMPFS_DIRCOOKIE_DOTDOT; 1207 } else { 1208 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1209 de = TAILQ_FIRST(&node->tn_spec. 1210 tn_dir.tn_dir); 1211 } else if (de != NULL) { 1212 de = TAILQ_NEXT(de, td_entries); 1213 } else { 1214 de = tmpfs_dir_lookupbycookie(node, 1215 off); 1216 KASSERT(de != NULL); 1217 de = TAILQ_NEXT(de, td_entries); 1218 } 1219 if (de == NULL) { 1220 off = TMPFS_DIRCOOKIE_EOF; 1221 } else { 1222 off = tmpfs_dircookie(de); 1223 } 1224 } 1225 1226 (*cookies)[i] = off; 1227 } 1228 KASSERT(uio->uio_offset == off); 1229 } 1230 1231 out: 1232 KASSERT(VOP_ISLOCKED(vp)); 1233 1234 return error; 1235 } 1236 1237 /* --------------------------------------------------------------------- */ 1238 1239 int 1240 tmpfs_readlink(void *v) 1241 { 1242 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1243 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1244 1245 int error; 1246 struct tmpfs_node *node; 1247 1248 KASSERT(VOP_ISLOCKED(vp)); 1249 KASSERT(uio->uio_offset == 0); 1250 KASSERT(vp->v_type == VLNK); 1251 1252 node = VP_TO_TMPFS_NODE(vp); 1253 1254 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1255 MIN(node->tn_size, uio->uio_resid), uio); 1256 node->tn_status |= TMPFS_NODE_ACCESSED; 1257 1258 KASSERT(VOP_ISLOCKED(vp)); 1259 1260 return error; 1261 } 1262 1263 /* --------------------------------------------------------------------- */ 1264 1265 int 1266 tmpfs_inactive(void *v) 1267 { 1268 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1269 1270 struct tmpfs_node *node; 1271 1272 KASSERT(VOP_ISLOCKED(vp)); 1273 1274 node = VP_TO_TMPFS_NODE(vp); 1275 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1276 VOP_UNLOCK(vp); 1277 1278 return 0; 1279 } 1280 1281 /* --------------------------------------------------------------------- */ 1282 1283 int 1284 tmpfs_reclaim(void *v) 1285 { 1286 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1287 1288 struct tmpfs_mount *tmp; 1289 struct tmpfs_node *node; 1290 1291 node = VP_TO_TMPFS_NODE(vp); 1292 tmp = VFS_TO_TMPFS(vp->v_mount); 1293 1294 cache_purge(vp); 1295 tmpfs_free_vp(vp); 1296 1297 /* If the node referenced by this vnode was deleted by the user, 1298 * we must free its associated data structures (now that the vnode 1299 * is being reclaimed). */ 1300 if (node->tn_links == 0) 1301 tmpfs_free_node(tmp, node); 1302 1303 KASSERT(vp->v_data == NULL); 1304 1305 return 0; 1306 } 1307 1308 /* --------------------------------------------------------------------- */ 1309 1310 int 1311 tmpfs_print(void *v) 1312 { 1313 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1314 1315 struct tmpfs_node *node; 1316 1317 node = VP_TO_TMPFS_NODE(vp); 1318 1319 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1320 node, node->tn_flags, node->tn_links); 1321 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1322 ", status 0x%x", 1323 node->tn_mode, node->tn_uid, node->tn_gid, 1324 (uintmax_t)node->tn_size, node->tn_status); 1325 if (vp->v_type == VFIFO) 1326 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1327 printf("\n"); 1328 1329 return 0; 1330 } 1331 1332 /* --------------------------------------------------------------------- */ 1333 1334 int 1335 tmpfs_pathconf(void *v) 1336 { 1337 int name = ((struct vop_pathconf_args *)v)->a_name; 1338 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1339 1340 int error; 1341 1342 error = 0; 1343 1344 switch (name) { 1345 case _PC_LINK_MAX: 1346 *retval = LINK_MAX; 1347 break; 1348 1349 case _PC_NAME_MAX: 1350 *retval = NAME_MAX; 1351 break; 1352 1353 case _PC_PATH_MAX: 1354 *retval = PATH_MAX; 1355 break; 1356 1357 case _PC_PIPE_BUF: 1358 *retval = PIPE_BUF; 1359 break; 1360 1361 case _PC_CHOWN_RESTRICTED: 1362 *retval = 1; 1363 break; 1364 1365 case _PC_NO_TRUNC: 1366 *retval = 1; 1367 break; 1368 1369 case _PC_SYNC_IO: 1370 *retval = 1; 1371 break; 1372 1373 case _PC_FILESIZEBITS: 1374 *retval = 0; /* XXX Don't know which value should I return. */ 1375 break; 1376 1377 default: 1378 error = EINVAL; 1379 } 1380 1381 return error; 1382 } 1383 1384 /* --------------------------------------------------------------------- */ 1385 1386 int 1387 tmpfs_advlock(void *v) 1388 { 1389 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1390 1391 struct tmpfs_node *node; 1392 1393 node = VP_TO_TMPFS_NODE(vp); 1394 1395 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1396 } 1397 1398 int 1399 tmpfs_getpages(void *v) 1400 { 1401 struct vop_getpages_args /* { 1402 struct vnode *a_vp; 1403 voff_t a_offset; 1404 struct vm_page **a_m; 1405 int *a_count; 1406 int a_centeridx; 1407 vm_prot_t a_access_type; 1408 int a_advice; 1409 int a_flags; 1410 } */ * const ap = v; 1411 struct vnode *vp = ap->a_vp; 1412 const voff_t offset = ap->a_offset; 1413 struct vm_page **pgs = ap->a_m; 1414 const int centeridx = ap->a_centeridx; 1415 const vm_prot_t access_type = ap->a_access_type; 1416 const int advice = ap->a_advice; 1417 const int flags = ap->a_flags; 1418 int error, npages = *ap->a_count; 1419 struct tmpfs_node *node; 1420 struct uvm_object *uobj; 1421 1422 KASSERT(vp->v_type == VREG); 1423 KASSERT(mutex_owned(&vp->v_interlock)); 1424 1425 node = VP_TO_TMPFS_NODE(vp); 1426 uobj = node->tn_spec.tn_reg.tn_aobj; 1427 1428 /* 1429 * Currently, PGO_PASTEOF is not supported. 1430 */ 1431 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1432 if ((flags & PGO_LOCKED) == 0) 1433 mutex_exit(&vp->v_interlock); 1434 return EINVAL; 1435 } 1436 1437 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1438 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1439 } 1440 1441 if ((flags & PGO_LOCKED) != 0) 1442 return EBUSY; 1443 1444 if ((flags & PGO_NOTIMESTAMP) == 0) { 1445 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1446 node->tn_status |= TMPFS_NODE_ACCESSED; 1447 1448 if ((access_type & VM_PROT_WRITE) != 0) 1449 node->tn_status |= TMPFS_NODE_MODIFIED; 1450 } 1451 1452 mutex_exit(&vp->v_interlock); 1453 1454 /* 1455 * Invoke the pager. 1456 * 1457 * Clean the array of pages before. XXX: PR/32166 1458 * Note that vnode lock is shared with underlying UVM object. 1459 */ 1460 if (pgs) { 1461 memset(pgs, 0, sizeof(struct vm_pages *) * npages); 1462 } 1463 mutex_enter(&uobj->vmobjlock); 1464 error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, centeridx, 1465 access_type, advice, flags | PGO_ALLPAGES); 1466 1467 #if defined(DEBUG) 1468 if (!error && pgs) { 1469 for (int i = 0; i < npages; i++) { 1470 KASSERT(pgs[i] != NULL); 1471 } 1472 } 1473 #endif 1474 return error; 1475 } 1476 1477 int 1478 tmpfs_putpages(void *v) 1479 { 1480 struct vop_putpages_args /* { 1481 struct vnode *a_vp; 1482 voff_t a_offlo; 1483 voff_t a_offhi; 1484 int a_flags; 1485 } */ * const ap = v; 1486 struct vnode *vp = ap->a_vp; 1487 const voff_t offlo = ap->a_offlo; 1488 const voff_t offhi = ap->a_offhi; 1489 const int flags = ap->a_flags; 1490 struct tmpfs_node *node; 1491 struct uvm_object *uobj; 1492 int error; 1493 1494 KASSERT(mutex_owned(&vp->v_interlock)); 1495 1496 node = VP_TO_TMPFS_NODE(vp); 1497 1498 if (vp->v_type != VREG) { 1499 mutex_exit(&vp->v_interlock); 1500 return 0; 1501 } 1502 1503 uobj = node->tn_spec.tn_reg.tn_aobj; 1504 mutex_exit(&vp->v_interlock); 1505 1506 mutex_enter(&uobj->vmobjlock); 1507 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1508 1509 /* XXX mtime */ 1510 1511 return error; 1512 } 1513 1514 /* --------------------------------------------------------------------- */ 1515 1516 #ifdef TMPFS_WHITEOUT 1517 int 1518 tmpfs_whiteout(void *v) 1519 { 1520 struct vnode *dvp = ((struct vop_whiteout_args *)v)->a_dvp; 1521 struct componentname *cnp = ((struct vop_whiteout_args *)v)->a_cnp; 1522 int flags = ((struct vop_whiteout_args *)v)->a_flags; 1523 struct tmpfs_mount *tmp = VFS_TO_TMPFS(dvp->v_mount); 1524 struct tmpfs_dirent *de; 1525 int error; 1526 1527 switch (flags) { 1528 case LOOKUP: 1529 break; 1530 case CREATE: 1531 error = tmpfs_alloc_dirent(tmp, TMPFS_NODE_WHITEOUT, 1532 cnp->cn_nameptr, cnp->cn_namelen, &de); 1533 if (error) 1534 return error; 1535 tmpfs_dir_attach(dvp, de); 1536 break; 1537 case DELETE: 1538 cnp->cn_flags &= ~DOWHITEOUT; /* when in doubt, cargo cult */ 1539 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), cnp); 1540 if (de == NULL) 1541 return ENOENT; 1542 tmpfs_dir_detach(dvp, de); 1543 tmpfs_free_dirent(tmp, de, true); 1544 break; 1545 } 1546 1547 return 0; 1548 } 1549 #endif 1550