1 /* $NetBSD: tmpfs_vnops.c,v 1.75 2010/11/30 10:43:04 dholland 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 1.75 2010/11/30 10:43:04 dholland Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/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 { NULL, NULL } 110 }; 111 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 112 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 113 114 /* 115 * tmpfs_lookup: lookup routine. 116 * 117 * Arguments: dvp (directory being searched), vpp (result), 118 * cnp (component name - path). 119 * 120 * => Caller holds a reference and lock on dvp. 121 * => We return looked-up vnode (vpp) locked, with a reference held. 122 */ 123 int 124 tmpfs_lookup(void *v) 125 { 126 struct vop_lookup_args /* { 127 struct vnode *a_dvp; 128 struct vnode **a_vpp; 129 struct componentname *a_cnp; 130 } */ *ap = v; 131 struct vnode *dvp = ap->a_dvp, **vpp = ap->a_vpp; 132 struct componentname *cnp = ap->a_cnp; 133 struct tmpfs_dirent *de; 134 struct tmpfs_node *dnode; 135 int error; 136 137 KASSERT(VOP_ISLOCKED(dvp)); 138 139 dnode = VP_TO_TMPFS_DIR(dvp); 140 *vpp = NULL; 141 142 /* Check accessibility of requested node as a first step. */ 143 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 144 if (error != 0) 145 goto out; 146 147 /* 148 * If requesting the last path component on a read-only file system 149 * with a write operation, deny it. 150 */ 151 if ((cnp->cn_flags & ISLASTCN) && 152 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 153 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 154 error = EROFS; 155 goto out; 156 } 157 158 /* 159 * Avoid doing a linear scan of the directory if the requested 160 * directory/name couple is already in the cache. 161 */ 162 error = cache_lookup(dvp, vpp, cnp); 163 if (error >= 0) 164 goto out; 165 166 /* We cannot be requesting the parent directory of the root node. */ 167 KASSERT(IMPLIES(dnode->tn_type == VDIR && 168 dnode->tn_spec.tn_dir.tn_parent == dnode, 169 !(cnp->cn_flags & ISDOTDOT))); 170 171 if (cnp->cn_flags & ISDOTDOT) { 172 VOP_UNLOCK(dvp); 173 174 /* Allocate a new vnode on the matching entry. */ 175 error = tmpfs_alloc_vp(dvp->v_mount, 176 dnode->tn_spec.tn_dir.tn_parent, vpp); 177 178 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 179 goto done; 180 181 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 182 if ((cnp->cn_flags & ISLASTCN) && 183 (cnp->cn_nameiop == RENAME)) { 184 error = EISDIR; 185 goto out; 186 } 187 vref(dvp); 188 *vpp = dvp; 189 error = 0; 190 goto done; 191 } 192 193 de = tmpfs_dir_lookup(dnode, cnp); 194 if (de == NULL) { 195 /* 196 * The entry was not found in the directory. This is valid 197 * if we are creating or renaming an entry and are working 198 * on the last component of the path name. 199 */ 200 if ((cnp->cn_flags & ISLASTCN) && (cnp->cn_nameiop == CREATE || 201 cnp->cn_nameiop == RENAME)) { 202 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 203 if (error) { 204 goto out; 205 } 206 error = EJUSTRETURN; 207 } else { 208 error = ENOENT; 209 } 210 } else { 211 struct tmpfs_node *tnode = de->td_node; 212 213 /* 214 * If we are not at the last path component and found a 215 * non-directory or non-link entry (which may itself be 216 * pointing to a directory), raise an error. 217 */ 218 if ((tnode->tn_type != VDIR && tnode->tn_type != VLNK) && 219 (cnp->cn_flags & ISLASTCN) == 0) { 220 error = ENOTDIR; 221 goto out; 222 } 223 224 /* Check permissions. */ 225 if ((cnp->cn_flags & ISLASTCN) && (cnp->cn_nameiop == DELETE || 226 cnp->cn_nameiop == RENAME)) { 227 kauth_action_t action = 0; 228 229 /* This is the file-system's decision. */ 230 if ((dnode->tn_mode & S_ISTXT) != 0 && 231 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 232 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 233 error = EPERM; 234 else 235 error = 0; 236 237 /* Only bother if we are not already failing it. */ 238 if (!error) { 239 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 240 } 241 242 if (cnp->cn_nameiop == DELETE) { 243 action |= KAUTH_VNODE_DELETE; 244 } else { 245 KASSERT(cnp->cn_nameiop == RENAME); 246 action |= KAUTH_VNODE_RENAME; 247 } 248 error = kauth_authorize_vnode(cnp->cn_cred, 249 action, *vpp, dvp, error); 250 if (error) { 251 goto out; 252 } 253 } 254 /* Allocate a new vnode on the matching entry. */ 255 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 256 } 257 done: 258 /* 259 * Store the result of this lookup in the cache. Avoid this if the 260 * request was for creation, as it does not improve timings on 261 * emprical tests. 262 */ 263 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 264 (cnp->cn_flags & ISDOTDOT) == 0) 265 cache_enter(dvp, *vpp, cnp); 266 267 out: 268 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 269 KASSERT(VOP_ISLOCKED(dvp)); 270 return error; 271 } 272 273 int 274 tmpfs_create(void *v) 275 { 276 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 277 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 278 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 279 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 280 281 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 282 283 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 284 } 285 /* --------------------------------------------------------------------- */ 286 287 int 288 tmpfs_mknod(void *v) 289 { 290 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 291 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 292 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 293 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 294 295 if (vap->va_type != VBLK && vap->va_type != VCHR && 296 vap->va_type != VFIFO) { 297 vput(dvp); 298 return EINVAL; 299 } 300 301 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 302 } 303 304 /* --------------------------------------------------------------------- */ 305 306 int 307 tmpfs_open(void *v) 308 { 309 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 310 int mode = ((struct vop_open_args *)v)->a_mode; 311 312 int error; 313 struct tmpfs_node *node; 314 315 KASSERT(VOP_ISLOCKED(vp)); 316 317 node = VP_TO_TMPFS_NODE(vp); 318 319 /* The file is still active but all its names have been removed 320 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 321 * it is about to die. */ 322 if (node->tn_links < 1) { 323 error = ENOENT; 324 goto out; 325 } 326 327 /* If the file is marked append-only, deny write requests. */ 328 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 329 error = EPERM; 330 else 331 error = 0; 332 333 out: 334 KASSERT(VOP_ISLOCKED(vp)); 335 336 return error; 337 } 338 339 /* --------------------------------------------------------------------- */ 340 341 int 342 tmpfs_close(void *v) 343 { 344 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 345 346 struct tmpfs_node *node; 347 348 KASSERT(VOP_ISLOCKED(vp)); 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 if (node->tn_links > 0) { 353 /* Update node times. No need to do it if the node has 354 * been deleted, because it will vanish after we return. */ 355 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 356 } 357 358 return 0; 359 } 360 361 /* --------------------------------------------------------------------- */ 362 363 static int 364 tmpfs_check_possible(struct vnode *vp, struct tmpfs_node *node, mode_t mode) 365 { 366 int error = 0; 367 368 switch (vp->v_type) { 369 case VDIR: 370 /* FALLTHROUGH */ 371 case VLNK: 372 /* FALLTHROUGH */ 373 case VREG: 374 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 375 error = EROFS; 376 goto out; 377 } 378 break; 379 380 case VBLK: 381 /* FALLTHROUGH */ 382 case VCHR: 383 /* FALLTHROUGH */ 384 case VSOCK: 385 /* FALLTHROUGH */ 386 case VFIFO: 387 break; 388 389 default: 390 error = EINVAL; 391 goto out; 392 } 393 394 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 395 error = EPERM; 396 goto out; 397 } 398 399 out: 400 return error; 401 } 402 403 static int 404 tmpfs_check_permitted(struct vnode *vp, struct tmpfs_node *node, mode_t mode, 405 kauth_cred_t cred) 406 { 407 408 return genfs_can_access(vp->v_type, node->tn_mode, node->tn_uid, 409 node->tn_gid, mode, cred); 410 } 411 412 int 413 tmpfs_access(void *v) 414 { 415 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 416 int mode = ((struct vop_access_args *)v)->a_mode; 417 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 418 419 int error; 420 struct tmpfs_node *node; 421 422 KASSERT(VOP_ISLOCKED(vp)); 423 424 node = VP_TO_TMPFS_NODE(vp); 425 426 error = tmpfs_check_possible(vp, node, mode); 427 if (error) 428 goto out; 429 430 error = tmpfs_check_permitted(vp, node, mode, cred); 431 432 error = kauth_authorize_vnode(cred, kauth_mode_to_action(mode), vp, 433 NULL, error); 434 435 out: 436 KASSERT(VOP_ISLOCKED(vp)); 437 438 return error; 439 } 440 441 /* --------------------------------------------------------------------- */ 442 443 int 444 tmpfs_getattr(void *v) 445 { 446 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 447 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 448 449 struct tmpfs_node *node; 450 451 node = VP_TO_TMPFS_NODE(vp); 452 453 vattr_null(vap); 454 455 tmpfs_itimes(vp, NULL, NULL, NULL); 456 457 vap->va_type = vp->v_type; 458 vap->va_mode = node->tn_mode; 459 vap->va_nlink = node->tn_links; 460 vap->va_uid = node->tn_uid; 461 vap->va_gid = node->tn_gid; 462 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 463 vap->va_fileid = node->tn_id; 464 vap->va_size = node->tn_size; 465 vap->va_blocksize = PAGE_SIZE; 466 vap->va_atime = node->tn_atime; 467 vap->va_mtime = node->tn_mtime; 468 vap->va_ctime = node->tn_ctime; 469 vap->va_birthtime = node->tn_birthtime; 470 vap->va_gen = node->tn_gen; 471 vap->va_flags = node->tn_flags; 472 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 473 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 474 vap->va_bytes = round_page(node->tn_size); 475 vap->va_filerev = VNOVAL; 476 vap->va_vaflags = 0; 477 vap->va_spare = VNOVAL; /* XXX */ 478 479 return 0; 480 } 481 482 /* --------------------------------------------------------------------- */ 483 484 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 485 /* XXX Should this operation be atomic? I think it should, but code in 486 * XXX other places (e.g., ufs) doesn't seem to be... */ 487 int 488 tmpfs_setattr(void *v) 489 { 490 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 491 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 492 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 493 struct lwp *l = curlwp; 494 495 int error; 496 497 KASSERT(VOP_ISLOCKED(vp)); 498 499 error = 0; 500 501 /* Abort if any unsettable attribute is given. */ 502 if (vap->va_type != VNON || 503 vap->va_nlink != VNOVAL || 504 vap->va_fsid != VNOVAL || 505 vap->va_fileid != VNOVAL || 506 vap->va_blocksize != VNOVAL || 507 GOODTIME(&vap->va_ctime) || 508 vap->va_gen != VNOVAL || 509 vap->va_rdev != VNOVAL || 510 vap->va_bytes != VNOVAL) 511 error = EINVAL; 512 513 if (error == 0 && (vap->va_flags != VNOVAL)) 514 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 515 516 if (error == 0 && (vap->va_size != VNOVAL)) 517 error = tmpfs_chsize(vp, vap->va_size, cred, l); 518 519 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 520 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 521 522 if (error == 0 && (vap->va_mode != VNOVAL)) 523 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 524 525 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 526 || GOODTIME(&vap->va_birthtime))) 527 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 528 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 529 return 0; 530 531 /* Update the node times. We give preference to the error codes 532 * generated by this function rather than the ones that may arise 533 * from tmpfs_update. */ 534 tmpfs_update(vp, NULL, NULL, NULL, 0); 535 536 KASSERT(VOP_ISLOCKED(vp)); 537 538 return error; 539 } 540 541 /* --------------------------------------------------------------------- */ 542 543 int 544 tmpfs_read(void *v) 545 { 546 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 547 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 548 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 549 550 int error; 551 struct tmpfs_node *node; 552 struct uvm_object *uobj; 553 554 KASSERT(VOP_ISLOCKED(vp)); 555 556 node = VP_TO_TMPFS_NODE(vp); 557 558 if (vp->v_type != VREG) { 559 error = EISDIR; 560 goto out; 561 } 562 563 if (uio->uio_offset < 0) { 564 error = EINVAL; 565 goto out; 566 } 567 568 node->tn_status |= TMPFS_NODE_ACCESSED; 569 570 uobj = node->tn_spec.tn_reg.tn_aobj; 571 error = 0; 572 while (error == 0 && uio->uio_resid > 0) { 573 vsize_t len; 574 575 if (node->tn_size <= uio->uio_offset) 576 break; 577 578 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 579 if (len == 0) 580 break; 581 582 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 583 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 584 } 585 586 out: 587 KASSERT(VOP_ISLOCKED(vp)); 588 589 return error; 590 } 591 592 /* --------------------------------------------------------------------- */ 593 594 int 595 tmpfs_write(void *v) 596 { 597 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 598 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 599 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 600 601 bool extended; 602 int error; 603 off_t oldsize; 604 struct tmpfs_node *node; 605 struct uvm_object *uobj; 606 607 KASSERT(VOP_ISLOCKED(vp)); 608 609 node = VP_TO_TMPFS_NODE(vp); 610 oldsize = node->tn_size; 611 612 if (uio->uio_offset < 0 || vp->v_type != VREG) { 613 error = EINVAL; 614 goto out; 615 } 616 617 if (uio->uio_resid == 0) { 618 error = 0; 619 goto out; 620 } 621 622 if (ioflag & IO_APPEND) 623 uio->uio_offset = node->tn_size; 624 625 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 626 if (extended) { 627 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 628 if (error != 0) 629 goto out; 630 } 631 632 uobj = node->tn_spec.tn_reg.tn_aobj; 633 error = 0; 634 while (error == 0 && uio->uio_resid > 0) { 635 vsize_t len; 636 637 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 638 if (len == 0) 639 break; 640 641 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 642 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 643 } 644 645 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 646 (extended ? TMPFS_NODE_CHANGED : 0); 647 648 if (error != 0) 649 (void)tmpfs_reg_resize(vp, oldsize); 650 651 VN_KNOTE(vp, NOTE_WRITE); 652 653 out: 654 KASSERT(VOP_ISLOCKED(vp)); 655 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 656 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 657 658 return error; 659 } 660 661 /* --------------------------------------------------------------------- */ 662 663 int 664 tmpfs_fsync(void *v) 665 { 666 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 667 668 KASSERT(VOP_ISLOCKED(vp)); 669 670 tmpfs_update(vp, NULL, NULL, NULL, 0); 671 672 return 0; 673 } 674 675 /* --------------------------------------------------------------------- */ 676 677 int 678 tmpfs_remove(void *v) 679 { 680 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 681 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 682 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 683 684 int error; 685 struct tmpfs_dirent *de; 686 struct tmpfs_mount *tmp; 687 struct tmpfs_node *dnode; 688 struct tmpfs_node *node; 689 690 KASSERT(VOP_ISLOCKED(dvp)); 691 KASSERT(VOP_ISLOCKED(vp)); 692 693 if (vp->v_type == VDIR) { 694 error = EPERM; 695 goto out; 696 } 697 698 dnode = VP_TO_TMPFS_DIR(dvp); 699 node = VP_TO_TMPFS_NODE(vp); 700 tmp = VFS_TO_TMPFS(vp->v_mount); 701 de = tmpfs_dir_lookup(dnode, cnp); 702 KASSERT(de); 703 KASSERT(de->td_node == node); 704 705 /* Files marked as immutable or append-only cannot be deleted. */ 706 if (node->tn_flags & (IMMUTABLE | APPEND)) { 707 error = EPERM; 708 goto out; 709 } 710 711 /* Remove the entry from the directory; as it is a file, we do not 712 * have to change the number of hard links of the directory. */ 713 tmpfs_dir_detach(dvp, de); 714 715 /* Free the directory entry we just deleted. Note that the node 716 * referred by it will not be removed until the vnode is really 717 * reclaimed. */ 718 tmpfs_free_dirent(tmp, de, true); 719 720 error = 0; 721 722 out: 723 vput(vp); 724 if (dvp == vp) 725 vrele(dvp); 726 else 727 vput(dvp); 728 729 return error; 730 } 731 732 /* --------------------------------------------------------------------- */ 733 734 int 735 tmpfs_link(void *v) 736 { 737 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 738 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 739 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 740 741 int error; 742 struct tmpfs_dirent *de; 743 struct tmpfs_node *dnode; 744 struct tmpfs_node *node; 745 746 KASSERT(VOP_ISLOCKED(dvp)); 747 KASSERT(dvp != vp); /* XXX When can this be false? */ 748 749 dnode = VP_TO_TMPFS_DIR(dvp); 750 node = VP_TO_TMPFS_NODE(vp); 751 752 /* Lock vp because we will need to run tmpfs_update over it, which 753 * needs the vnode to be locked. */ 754 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 755 756 /* XXX: Why aren't the following two tests done by the caller? */ 757 758 /* Hard links of directories are forbidden. */ 759 if (vp->v_type == VDIR) { 760 error = EPERM; 761 goto out; 762 } 763 764 /* Cannot create cross-device links. */ 765 if (dvp->v_mount != vp->v_mount) { 766 error = EXDEV; 767 goto out; 768 } 769 770 /* Ensure that we do not overflow the maximum number of links imposed 771 * by the system. */ 772 KASSERT(node->tn_links <= LINK_MAX); 773 if (node->tn_links == LINK_MAX) { 774 error = EMLINK; 775 goto out; 776 } 777 778 /* We cannot create links of files marked immutable or append-only. */ 779 if (node->tn_flags & (IMMUTABLE | APPEND)) { 780 error = EPERM; 781 goto out; 782 } 783 784 /* Allocate a new directory entry to represent the node. */ 785 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 786 cnp->cn_nameptr, cnp->cn_namelen, &de); 787 if (error != 0) 788 goto out; 789 790 /* Insert the new directory entry into the appropriate directory. */ 791 tmpfs_dir_attach(dvp, de); 792 793 /* vp link count has changed, so update node times. */ 794 node->tn_status |= TMPFS_NODE_CHANGED; 795 tmpfs_update(vp, NULL, NULL, NULL, 0); 796 797 error = 0; 798 799 out: 800 VOP_UNLOCK(vp); 801 vput(dvp); 802 803 return error; 804 } 805 806 /* 807 * tmpfs_rename: rename routine. 808 * 809 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 810 * and tvp (to-leaf), if exists (NULL if not). 811 * 812 * => Caller holds a reference on fdvp and fvp, they are unlocked. 813 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 814 * 815 * => Both tdvp and tvp are referenced and locked. It is our responsibility 816 * to release the references and unlock them (or destroy). 817 */ 818 int 819 tmpfs_rename(void *v) 820 { 821 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 822 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 823 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 824 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 825 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 826 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 827 828 char *newname; 829 int error; 830 struct tmpfs_dirent *de, *de2; 831 struct tmpfs_mount *tmp; 832 struct tmpfs_node *fdnode; 833 struct tmpfs_node *fnode; 834 struct tmpfs_node *tnode; 835 struct tmpfs_node *tdnode; 836 size_t namelen; 837 838 KASSERT(VOP_ISLOCKED(tdvp)); 839 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 840 841 newname = NULL; 842 namelen = 0; 843 tmp = NULL; 844 845 /* Disallow cross-device renames. */ 846 if (fvp->v_mount != tdvp->v_mount || 847 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 848 error = EXDEV; 849 goto out_unlocked; 850 } 851 852 fnode = VP_TO_TMPFS_NODE(fvp); 853 fdnode = VP_TO_TMPFS_DIR(fdvp); 854 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 855 tdnode = VP_TO_TMPFS_DIR(tdvp); 856 tmp = VFS_TO_TMPFS(tdvp->v_mount); 857 858 if (fdvp == tvp) { 859 error = 0; 860 goto out_unlocked; 861 } 862 863 /* Allocate memory, if necessary, for a new name. */ 864 namelen = tcnp->cn_namelen; 865 if (tmpfs_strname_neqlen(fcnp, tcnp)) { 866 newname = tmpfs_strname_alloc(tmp, namelen); 867 if (newname == NULL) { 868 error = ENOSPC; 869 goto out_unlocked; 870 } 871 } 872 873 /* If we need to move the directory between entries, lock the 874 * source so that we can safely operate on it. */ 875 876 /* XXX: this is a potential locking order violation! */ 877 if (fdnode != tdnode) { 878 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 879 } 880 881 /* 882 * If the node we were renaming has scarpered, just give up. 883 */ 884 de = tmpfs_dir_lookup(fdnode, fcnp); 885 if (de == NULL || de->td_node != fnode) { 886 error = ENOENT; 887 goto out; 888 } 889 890 /* If source and target is the same vnode, remove the source link. */ 891 if (fvp == tvp) { 892 /* 893 * Detach and free the directory entry. Drops the link 894 * count on the node. 895 */ 896 tmpfs_dir_detach(fdvp, de); 897 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 898 VN_KNOTE(fdvp, NOTE_WRITE); 899 goto out_ok; 900 } 901 902 /* If replacing an existing entry, ensure we can do the operation. */ 903 if (tvp != NULL) { 904 KASSERT(tnode != NULL); 905 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 906 if (tnode->tn_size > 0) { 907 error = ENOTEMPTY; 908 goto out; 909 } 910 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 911 error = ENOTDIR; 912 goto out; 913 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 914 error = EISDIR; 915 goto out; 916 } else { 917 KASSERT(fnode->tn_type != VDIR && 918 tnode->tn_type != VDIR); 919 } 920 } 921 922 /* If the node is being moved to another directory, we have to do 923 * the move. */ 924 if (fdnode != tdnode) { 925 /* In case we are moving a directory, we have to adjust its 926 * parent to point to the new parent. */ 927 if (de->td_node->tn_type == VDIR) { 928 struct tmpfs_node *n; 929 930 /* Ensure the target directory is not a child of the 931 * directory being moved. Otherwise, we'd end up 932 * with stale nodes. */ 933 n = tdnode; 934 while (n != n->tn_spec.tn_dir.tn_parent) { 935 if (n == fnode) { 936 error = EINVAL; 937 goto out; 938 } 939 n = n->tn_spec.tn_dir.tn_parent; 940 } 941 942 /* Adjust the parent pointer. */ 943 TMPFS_VALIDATE_DIR(fnode); 944 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 945 946 /* As a result of changing the target of the '..' 947 * entry, the link count of the source and target 948 * directories has to be adjusted. */ 949 fdnode->tn_links--; 950 tdnode->tn_links++; 951 } 952 953 /* Do the move: just remove the entry from the source directory 954 * and insert it into the target one. */ 955 tmpfs_dir_detach(fdvp, de); 956 tmpfs_dir_attach(tdvp, de); 957 958 /* Notify listeners of fdvp about the change in the directory. 959 * We can do it at this point because we aren't touching fdvp 960 * any more below. */ 961 VN_KNOTE(fdvp, NOTE_WRITE); 962 } 963 964 /* If we are overwriting an entry, we have to remove the old one 965 * from the target directory. */ 966 if (tvp != NULL) { 967 KASSERT(tnode != NULL); 968 969 /* Remove the old entry from the target directory. 970 * Note! This relies on tmpfs_dir_attach() putting the new 971 * node on the end of the target's node list. */ 972 de2 = tmpfs_dir_lookup(tdnode, tcnp); 973 KASSERT(de2 != NULL); 974 KASSERT(de2->td_node == tnode); 975 tmpfs_dir_detach(tdvp, de2); 976 977 /* Free the directory entry we just deleted. Note that the 978 * node referred by it will not be removed until the vnode is 979 * really reclaimed. */ 980 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 981 } 982 983 /* If the name has changed, we need to make it effective by changing 984 * it in the directory entry. */ 985 if (newname != NULL) { 986 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 987 KASSERT(tcnp->cn_namelen < 0xffff); 988 989 tmpfs_strname_free(tmp, de->td_name, de->td_namelen); 990 de->td_namelen = (uint16_t)namelen; 991 memcpy(newname, tcnp->cn_nameptr, namelen); 992 de->td_name = newname; 993 newname = NULL; 994 995 fnode->tn_status |= TMPFS_NODE_CHANGED; 996 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 997 } 998 out_ok: 999 /* Notify listeners of tdvp about the change in the directory (either 1000 * because a new entry was added or because one was removed) and 1001 * listeners of fvp about the rename. */ 1002 VN_KNOTE(tdvp, NOTE_WRITE); 1003 VN_KNOTE(fvp, NOTE_RENAME); 1004 1005 error = 0; 1006 1007 out: 1008 if (fdnode != tdnode) 1009 VOP_UNLOCK(fdvp); 1010 1011 out_unlocked: 1012 /* Release target nodes. */ 1013 if (tdvp == tvp) 1014 vrele(tdvp); 1015 else 1016 vput(tdvp); 1017 if (tvp != NULL) 1018 vput(tvp); 1019 1020 /* Release source nodes. */ 1021 vrele(fdvp); 1022 vrele(fvp); 1023 1024 if (newname != NULL) { 1025 tmpfs_strname_free(tmp, newname, namelen); 1026 } 1027 return error; 1028 } 1029 1030 /* --------------------------------------------------------------------- */ 1031 1032 int 1033 tmpfs_mkdir(void *v) 1034 { 1035 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1036 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1037 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1038 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1039 1040 KASSERT(vap->va_type == VDIR); 1041 1042 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1043 } 1044 1045 /* --------------------------------------------------------------------- */ 1046 1047 int 1048 tmpfs_rmdir(void *v) 1049 { 1050 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1051 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1052 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1053 1054 int error; 1055 struct tmpfs_dirent *de; 1056 struct tmpfs_mount *tmp; 1057 struct tmpfs_node *dnode; 1058 struct tmpfs_node *node; 1059 1060 KASSERT(VOP_ISLOCKED(dvp)); 1061 KASSERT(VOP_ISLOCKED(vp)); 1062 1063 tmp = VFS_TO_TMPFS(dvp->v_mount); 1064 dnode = VP_TO_TMPFS_DIR(dvp); 1065 node = VP_TO_TMPFS_DIR(vp); 1066 error = 0; 1067 1068 /* Directories with more than two entries ('.' and '..') cannot be 1069 * removed. */ 1070 if (node->tn_size > 0) { 1071 error = ENOTEMPTY; 1072 goto out; 1073 } 1074 1075 /* This invariant holds only if we are not trying to remove "..". 1076 * We checked for that above so this is safe now. */ 1077 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1078 1079 /* Get the directory entry associated with node (vp). */ 1080 de = tmpfs_dir_lookup(dnode, cnp); 1081 KASSERT(de); 1082 KASSERT(de->td_node == node); 1083 1084 /* Check flags to see if we are allowed to remove the directory. */ 1085 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1086 error = EPERM; 1087 goto out; 1088 } 1089 1090 /* Detach the directory entry from the directory (dnode). */ 1091 tmpfs_dir_detach(dvp, de); 1092 1093 node->tn_links--; 1094 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1095 TMPFS_NODE_MODIFIED; 1096 node->tn_spec.tn_dir.tn_parent->tn_links--; 1097 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1098 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1099 1100 /* Release the parent. */ 1101 cache_purge(dvp); /* XXX Is this needed? */ 1102 1103 /* Free the directory entry we just deleted. Note that the node 1104 * referred by it will not be removed until the vnode is really 1105 * reclaimed. */ 1106 tmpfs_free_dirent(tmp, de, true); 1107 1108 KASSERT(node->tn_links == 0); 1109 out: 1110 /* Release the nodes. */ 1111 vput(dvp); 1112 vput(vp); 1113 1114 return error; 1115 } 1116 1117 /* --------------------------------------------------------------------- */ 1118 1119 int 1120 tmpfs_symlink(void *v) 1121 { 1122 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1123 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1124 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1125 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1126 char *target = ((struct vop_symlink_args *)v)->a_target; 1127 1128 KASSERT(vap->va_type == VLNK); 1129 1130 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1131 } 1132 1133 /* --------------------------------------------------------------------- */ 1134 1135 int 1136 tmpfs_readdir(void *v) 1137 { 1138 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1139 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1140 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1141 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1142 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1143 1144 int error; 1145 off_t startoff; 1146 off_t cnt; 1147 struct tmpfs_node *node; 1148 1149 KASSERT(VOP_ISLOCKED(vp)); 1150 1151 /* This operation only makes sense on directory nodes. */ 1152 if (vp->v_type != VDIR) { 1153 error = ENOTDIR; 1154 goto out; 1155 } 1156 1157 node = VP_TO_TMPFS_DIR(vp); 1158 1159 startoff = uio->uio_offset; 1160 1161 cnt = 0; 1162 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1163 error = tmpfs_dir_getdotdent(node, uio); 1164 if (error == -1) { 1165 error = 0; 1166 goto outok; 1167 } else if (error != 0) 1168 goto outok; 1169 cnt++; 1170 } 1171 1172 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1173 error = tmpfs_dir_getdotdotdent(node, uio); 1174 if (error == -1) { 1175 error = 0; 1176 goto outok; 1177 } else if (error != 0) 1178 goto outok; 1179 cnt++; 1180 } 1181 1182 error = tmpfs_dir_getdents(node, uio, &cnt); 1183 if (error == -1) 1184 error = 0; 1185 KASSERT(error >= 0); 1186 1187 outok: 1188 /* This label assumes that startoff has been 1189 * initialized. If the compiler didn't spit out warnings, we'd 1190 * simply make this one be 'out' and drop 'outok'. */ 1191 1192 if (eofflag != NULL) 1193 *eofflag = 1194 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1195 1196 /* Update NFS-related variables. */ 1197 if (error == 0 && cookies != NULL && ncookies != NULL) { 1198 off_t i; 1199 off_t off = startoff; 1200 struct tmpfs_dirent *de = NULL; 1201 1202 *ncookies = cnt; 1203 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1204 1205 for (i = 0; i < cnt; i++) { 1206 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1207 if (off == TMPFS_DIRCOOKIE_DOT) { 1208 off = TMPFS_DIRCOOKIE_DOTDOT; 1209 } else { 1210 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1211 de = TAILQ_FIRST(&node->tn_spec. 1212 tn_dir.tn_dir); 1213 } else if (de != NULL) { 1214 de = TAILQ_NEXT(de, td_entries); 1215 } else { 1216 de = tmpfs_dir_lookupbycookie(node, 1217 off); 1218 KASSERT(de != NULL); 1219 de = TAILQ_NEXT(de, td_entries); 1220 } 1221 if (de == NULL) { 1222 off = TMPFS_DIRCOOKIE_EOF; 1223 } else { 1224 off = tmpfs_dircookie(de); 1225 } 1226 } 1227 1228 (*cookies)[i] = off; 1229 } 1230 KASSERT(uio->uio_offset == off); 1231 } 1232 1233 out: 1234 KASSERT(VOP_ISLOCKED(vp)); 1235 1236 return error; 1237 } 1238 1239 /* --------------------------------------------------------------------- */ 1240 1241 int 1242 tmpfs_readlink(void *v) 1243 { 1244 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1245 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1246 1247 int error; 1248 struct tmpfs_node *node; 1249 1250 KASSERT(VOP_ISLOCKED(vp)); 1251 KASSERT(uio->uio_offset == 0); 1252 KASSERT(vp->v_type == VLNK); 1253 1254 node = VP_TO_TMPFS_NODE(vp); 1255 1256 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1257 MIN(node->tn_size, uio->uio_resid), uio); 1258 node->tn_status |= TMPFS_NODE_ACCESSED; 1259 1260 KASSERT(VOP_ISLOCKED(vp)); 1261 1262 return error; 1263 } 1264 1265 /* --------------------------------------------------------------------- */ 1266 1267 int 1268 tmpfs_inactive(void *v) 1269 { 1270 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1271 1272 struct tmpfs_node *node; 1273 1274 KASSERT(VOP_ISLOCKED(vp)); 1275 1276 node = VP_TO_TMPFS_NODE(vp); 1277 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1278 VOP_UNLOCK(vp); 1279 1280 return 0; 1281 } 1282 1283 /* --------------------------------------------------------------------- */ 1284 1285 int 1286 tmpfs_reclaim(void *v) 1287 { 1288 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1289 1290 struct tmpfs_mount *tmp; 1291 struct tmpfs_node *node; 1292 1293 node = VP_TO_TMPFS_NODE(vp); 1294 tmp = VFS_TO_TMPFS(vp->v_mount); 1295 1296 cache_purge(vp); 1297 tmpfs_free_vp(vp); 1298 1299 /* If the node referenced by this vnode was deleted by the user, 1300 * we must free its associated data structures (now that the vnode 1301 * is being reclaimed). */ 1302 if (node->tn_links == 0) 1303 tmpfs_free_node(tmp, node); 1304 1305 KASSERT(vp->v_data == NULL); 1306 1307 return 0; 1308 } 1309 1310 /* --------------------------------------------------------------------- */ 1311 1312 int 1313 tmpfs_print(void *v) 1314 { 1315 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1316 1317 struct tmpfs_node *node; 1318 1319 node = VP_TO_TMPFS_NODE(vp); 1320 1321 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1322 node, node->tn_flags, node->tn_links); 1323 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1324 ", status 0x%x", 1325 node->tn_mode, node->tn_uid, node->tn_gid, 1326 (uintmax_t)node->tn_size, node->tn_status); 1327 if (vp->v_type == VFIFO) 1328 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1329 printf("\n"); 1330 1331 return 0; 1332 } 1333 1334 /* --------------------------------------------------------------------- */ 1335 1336 int 1337 tmpfs_pathconf(void *v) 1338 { 1339 int name = ((struct vop_pathconf_args *)v)->a_name; 1340 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1341 1342 int error; 1343 1344 error = 0; 1345 1346 switch (name) { 1347 case _PC_LINK_MAX: 1348 *retval = LINK_MAX; 1349 break; 1350 1351 case _PC_NAME_MAX: 1352 *retval = NAME_MAX; 1353 break; 1354 1355 case _PC_PATH_MAX: 1356 *retval = PATH_MAX; 1357 break; 1358 1359 case _PC_PIPE_BUF: 1360 *retval = PIPE_BUF; 1361 break; 1362 1363 case _PC_CHOWN_RESTRICTED: 1364 *retval = 1; 1365 break; 1366 1367 case _PC_NO_TRUNC: 1368 *retval = 1; 1369 break; 1370 1371 case _PC_SYNC_IO: 1372 *retval = 1; 1373 break; 1374 1375 case _PC_FILESIZEBITS: 1376 *retval = 0; /* XXX Don't know which value should I return. */ 1377 break; 1378 1379 default: 1380 error = EINVAL; 1381 } 1382 1383 return error; 1384 } 1385 1386 /* --------------------------------------------------------------------- */ 1387 1388 int 1389 tmpfs_advlock(void *v) 1390 { 1391 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1392 1393 struct tmpfs_node *node; 1394 1395 node = VP_TO_TMPFS_NODE(vp); 1396 1397 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1398 } 1399 1400 /* --------------------------------------------------------------------- */ 1401 1402 int 1403 tmpfs_getpages(void *v) 1404 { 1405 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1406 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1407 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1408 int *count = ((struct vop_getpages_args *)v)->a_count; 1409 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1410 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1411 int advice = ((struct vop_getpages_args *)v)->a_advice; 1412 int flags = ((struct vop_getpages_args *)v)->a_flags; 1413 1414 int error; 1415 int i; 1416 struct tmpfs_node *node; 1417 struct uvm_object *uobj; 1418 int npages = *count; 1419 1420 KASSERT(vp->v_type == VREG); 1421 KASSERT(mutex_owned(&vp->v_interlock)); 1422 1423 node = VP_TO_TMPFS_NODE(vp); 1424 uobj = node->tn_spec.tn_reg.tn_aobj; 1425 1426 /* We currently don't rely on PGO_PASTEOF. */ 1427 1428 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1429 if ((flags & PGO_LOCKED) == 0) 1430 mutex_exit(&vp->v_interlock); 1431 return EINVAL; 1432 } 1433 1434 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1435 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1436 } 1437 1438 if ((flags & PGO_LOCKED) != 0) 1439 return EBUSY; 1440 1441 if ((flags & PGO_NOTIMESTAMP) == 0) { 1442 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1443 node->tn_status |= TMPFS_NODE_ACCESSED; 1444 1445 if ((access_type & VM_PROT_WRITE) != 0) 1446 node->tn_status |= TMPFS_NODE_MODIFIED; 1447 } 1448 1449 mutex_exit(&vp->v_interlock); 1450 1451 /* 1452 * Make sure that the array on which we will store the 1453 * gotten pages is clean. Otherwise uao_get (pointed to by 1454 * the pgo_get below) gets confused and does not return the 1455 * appropriate pages. 1456 * 1457 * XXX This shall be revisited when kern/32166 is addressed 1458 * because the loop to clean m[i] will most likely be redundant 1459 * as well as the PGO_ALLPAGES flag. 1460 */ 1461 if (m != NULL) 1462 for (i = 0; i < npages; i++) 1463 m[i] = NULL; 1464 mutex_enter(&uobj->vmobjlock); 1465 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1466 access_type, advice, flags | PGO_ALLPAGES); 1467 #if defined(DEBUG) 1468 { 1469 /* Make sure that all the pages we return are valid. */ 1470 int dbgi; 1471 if (error == 0 && m != NULL) 1472 for (dbgi = 0; dbgi < npages; dbgi++) 1473 KASSERT(m[dbgi] != NULL); 1474 } 1475 #endif 1476 1477 return error; 1478 } 1479 1480 /* --------------------------------------------------------------------- */ 1481 1482 int 1483 tmpfs_putpages(void *v) 1484 { 1485 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1486 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1487 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1488 int flags = ((struct vop_putpages_args *)v)->a_flags; 1489 1490 int error; 1491 struct tmpfs_node *node; 1492 struct uvm_object *uobj; 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