1 /* $NetBSD: tmpfs_vnops.c,v 1.51 2008/06/19 19:03:44 christos 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 1.51 2008/06/19 19:03:44 christos 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 <fs/tmpfs/tmpfs_vnops.h> 58 #include <fs/tmpfs/tmpfs.h> 59 60 /* --------------------------------------------------------------------- */ 61 62 /* 63 * vnode operations vector used for files stored in a tmpfs file system. 64 */ 65 int (**tmpfs_vnodeop_p)(void *); 66 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 67 { &vop_default_desc, vn_default_error }, 68 { &vop_lookup_desc, tmpfs_lookup }, 69 { &vop_create_desc, tmpfs_create }, 70 { &vop_mknod_desc, tmpfs_mknod }, 71 { &vop_open_desc, tmpfs_open }, 72 { &vop_close_desc, tmpfs_close }, 73 { &vop_access_desc, tmpfs_access }, 74 { &vop_getattr_desc, tmpfs_getattr }, 75 { &vop_setattr_desc, tmpfs_setattr }, 76 { &vop_read_desc, tmpfs_read }, 77 { &vop_write_desc, tmpfs_write }, 78 { &vop_ioctl_desc, tmpfs_ioctl }, 79 { &vop_fcntl_desc, tmpfs_fcntl }, 80 { &vop_poll_desc, tmpfs_poll }, 81 { &vop_kqfilter_desc, tmpfs_kqfilter }, 82 { &vop_revoke_desc, tmpfs_revoke }, 83 { &vop_mmap_desc, tmpfs_mmap }, 84 { &vop_fsync_desc, tmpfs_fsync }, 85 { &vop_seek_desc, tmpfs_seek }, 86 { &vop_remove_desc, tmpfs_remove }, 87 { &vop_link_desc, tmpfs_link }, 88 { &vop_rename_desc, tmpfs_rename }, 89 { &vop_mkdir_desc, tmpfs_mkdir }, 90 { &vop_rmdir_desc, tmpfs_rmdir }, 91 { &vop_symlink_desc, tmpfs_symlink }, 92 { &vop_readdir_desc, tmpfs_readdir }, 93 { &vop_readlink_desc, tmpfs_readlink }, 94 { &vop_abortop_desc, tmpfs_abortop }, 95 { &vop_inactive_desc, tmpfs_inactive }, 96 { &vop_reclaim_desc, tmpfs_reclaim }, 97 { &vop_lock_desc, tmpfs_lock }, 98 { &vop_unlock_desc, tmpfs_unlock }, 99 { &vop_bmap_desc, tmpfs_bmap }, 100 { &vop_strategy_desc, tmpfs_strategy }, 101 { &vop_print_desc, tmpfs_print }, 102 { &vop_pathconf_desc, tmpfs_pathconf }, 103 { &vop_islocked_desc, tmpfs_islocked }, 104 { &vop_advlock_desc, tmpfs_advlock }, 105 { &vop_bwrite_desc, tmpfs_bwrite }, 106 { &vop_getpages_desc, tmpfs_getpages }, 107 { &vop_putpages_desc, tmpfs_putpages }, 108 { NULL, NULL } 109 }; 110 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 111 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 112 113 /* --------------------------------------------------------------------- */ 114 115 int 116 tmpfs_lookup(void *v) 117 { 118 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 119 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 120 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 121 122 int error; 123 struct tmpfs_dirent *de; 124 struct tmpfs_node *dnode; 125 126 KASSERT(VOP_ISLOCKED(dvp)); 127 128 dnode = VP_TO_TMPFS_DIR(dvp); 129 *vpp = NULL; 130 131 /* Check accessibility of requested node as a first step. */ 132 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 133 if (error != 0) 134 goto out; 135 136 /* If requesting the last path component on a read-only file system 137 * with a write operation, deny it. */ 138 if ((cnp->cn_flags & ISLASTCN) && 139 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 140 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 141 error = EROFS; 142 goto out; 143 } 144 145 /* Avoid doing a linear scan of the directory if the requested 146 * directory/name couple is already in the cache. */ 147 error = cache_lookup(dvp, vpp, cnp); 148 if (error >= 0) 149 goto out; 150 151 /* We cannot be requesting the parent directory of the root node. */ 152 KASSERT(IMPLIES(dnode->tn_type == VDIR && 153 dnode->tn_spec.tn_dir.tn_parent == dnode, 154 !(cnp->cn_flags & ISDOTDOT))); 155 156 if (cnp->cn_flags & ISDOTDOT) { 157 VOP_UNLOCK(dvp, 0); 158 159 /* Allocate a new vnode on the matching entry. */ 160 error = tmpfs_alloc_vp(dvp->v_mount, 161 dnode->tn_spec.tn_dir.tn_parent, vpp); 162 163 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 164 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 165 VREF(dvp); 166 *vpp = dvp; 167 error = 0; 168 } else { 169 de = tmpfs_dir_lookup(dnode, cnp); 170 if (de == NULL) { 171 /* The entry was not found in the directory. 172 * This is OK iff we are creating or renaming an 173 * entry and are working on the last component of 174 * the path name. */ 175 if ((cnp->cn_flags & ISLASTCN) && 176 (cnp->cn_nameiop == CREATE || \ 177 cnp->cn_nameiop == RENAME)) { 178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 179 if (error != 0) 180 goto out; 181 182 /* Keep the component name in the buffer for 183 * future uses. */ 184 cnp->cn_flags |= SAVENAME; 185 186 error = EJUSTRETURN; 187 } else 188 error = ENOENT; 189 } else { 190 struct tmpfs_node *tnode; 191 192 /* The entry was found, so get its associated 193 * tmpfs_node. */ 194 tnode = de->td_node; 195 196 /* If we are not at the last path component and 197 * found a non-directory or non-link entry (which 198 * may itself be pointing to a directory), raise 199 * an error. */ 200 if ((tnode->tn_type != VDIR && 201 tnode->tn_type != VLNK) && 202 !(cnp->cn_flags & ISLASTCN)) { 203 error = ENOTDIR; 204 goto out; 205 } 206 207 /* If we are deleting or renaming the entry, keep 208 * track of its tmpfs_dirent so that it can be 209 * easily deleted later. */ 210 if ((cnp->cn_flags & ISLASTCN) && 211 (cnp->cn_nameiop == DELETE || 212 cnp->cn_nameiop == RENAME)) { 213 if ((dnode->tn_mode & S_ISTXT) != 0 && 214 kauth_authorize_generic(cnp->cn_cred, 215 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 return EPERM; 219 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 220 if (error != 0) 221 goto out; 222 } else 223 de = NULL; 224 225 /* Allocate a new vnode on the matching entry. */ 226 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 227 } 228 } 229 230 /* Store the result of this lookup in the cache. Avoid this if the 231 * request was for creation, as it does not improve timings on 232 * emprical tests. */ 233 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 234 (cnp->cn_flags & ISDOTDOT) == 0) 235 cache_enter(dvp, *vpp, cnp); 236 237 out: 238 /* If there were no errors, *vpp cannot be null and it must be 239 * locked. */ 240 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 241 242 /* dvp must always be locked. */ 243 KASSERT(VOP_ISLOCKED(dvp)); 244 245 return error; 246 } 247 248 /* --------------------------------------------------------------------- */ 249 250 int 251 tmpfs_create(void *v) 252 { 253 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 254 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 255 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 256 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 257 258 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 259 260 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 261 } 262 /* --------------------------------------------------------------------- */ 263 264 int 265 tmpfs_mknod(void *v) 266 { 267 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 268 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 269 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 270 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 271 272 if (vap->va_type != VBLK && vap->va_type != VCHR && 273 vap->va_type != VFIFO) 274 return EINVAL; 275 276 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 277 } 278 279 /* --------------------------------------------------------------------- */ 280 281 int 282 tmpfs_open(void *v) 283 { 284 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 285 int mode = ((struct vop_open_args *)v)->a_mode; 286 287 int error; 288 struct tmpfs_node *node; 289 290 KASSERT(VOP_ISLOCKED(vp)); 291 292 node = VP_TO_TMPFS_NODE(vp); 293 294 /* The file is still active but all its names have been removed 295 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 296 * it is about to die. */ 297 if (node->tn_links < 1) { 298 error = ENOENT; 299 goto out; 300 } 301 302 /* If the file is marked append-only, deny write requests. */ 303 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 304 error = EPERM; 305 else 306 error = 0; 307 308 out: 309 KASSERT(VOP_ISLOCKED(vp)); 310 311 return error; 312 } 313 314 /* --------------------------------------------------------------------- */ 315 316 int 317 tmpfs_close(void *v) 318 { 319 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 320 321 struct tmpfs_node *node; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 node = VP_TO_TMPFS_NODE(vp); 326 327 if (node->tn_links > 0) { 328 /* Update node times. No need to do it if the node has 329 * been deleted, because it will vanish after we return. */ 330 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 331 } 332 333 return 0; 334 } 335 336 /* --------------------------------------------------------------------- */ 337 338 int 339 tmpfs_access(void *v) 340 { 341 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 342 int mode = ((struct vop_access_args *)v)->a_mode; 343 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 344 345 int error; 346 struct tmpfs_node *node; 347 348 KASSERT(VOP_ISLOCKED(vp)); 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 switch (vp->v_type) { 353 case VDIR: 354 /* FALLTHROUGH */ 355 case VLNK: 356 /* FALLTHROUGH */ 357 case VREG: 358 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 359 error = EROFS; 360 goto out; 361 } 362 break; 363 364 case VBLK: 365 /* FALLTHROUGH */ 366 case VCHR: 367 /* FALLTHROUGH */ 368 case VSOCK: 369 /* FALLTHROUGH */ 370 case VFIFO: 371 break; 372 373 default: 374 error = EINVAL; 375 goto out; 376 } 377 378 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 379 error = EPERM; 380 goto out; 381 } 382 383 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 384 node->tn_gid, mode, cred); 385 386 out: 387 KASSERT(VOP_ISLOCKED(vp)); 388 389 return error; 390 } 391 392 /* --------------------------------------------------------------------- */ 393 394 int 395 tmpfs_getattr(void *v) 396 { 397 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 398 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 399 400 struct tmpfs_node *node; 401 402 node = VP_TO_TMPFS_NODE(vp); 403 404 VATTR_NULL(vap); 405 406 tmpfs_itimes(vp, NULL, NULL, NULL); 407 408 vap->va_type = vp->v_type; 409 vap->va_mode = node->tn_mode; 410 vap->va_nlink = node->tn_links; 411 vap->va_uid = node->tn_uid; 412 vap->va_gid = node->tn_gid; 413 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 414 vap->va_fileid = node->tn_id; 415 vap->va_size = node->tn_size; 416 vap->va_blocksize = PAGE_SIZE; 417 vap->va_atime = node->tn_atime; 418 vap->va_mtime = node->tn_mtime; 419 vap->va_ctime = node->tn_ctime; 420 vap->va_birthtime = node->tn_birthtime; 421 vap->va_gen = node->tn_gen; 422 vap->va_flags = node->tn_flags; 423 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 424 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 425 vap->va_bytes = round_page(node->tn_size); 426 vap->va_filerev = VNOVAL; 427 vap->va_vaflags = 0; 428 vap->va_spare = VNOVAL; /* XXX */ 429 430 return 0; 431 } 432 433 /* --------------------------------------------------------------------- */ 434 435 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 436 /* XXX Should this operation be atomic? I think it should, but code in 437 * XXX other places (e.g., ufs) doesn't seem to be... */ 438 int 439 tmpfs_setattr(void *v) 440 { 441 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 442 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 443 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 444 struct lwp *l = curlwp; 445 446 int error; 447 448 KASSERT(VOP_ISLOCKED(vp)); 449 450 error = 0; 451 452 /* Abort if any unsettable attribute is given. */ 453 if (vap->va_type != VNON || 454 vap->va_nlink != VNOVAL || 455 vap->va_fsid != VNOVAL || 456 vap->va_fileid != VNOVAL || 457 vap->va_blocksize != VNOVAL || 458 GOODTIME(&vap->va_ctime) || 459 vap->va_gen != VNOVAL || 460 vap->va_rdev != VNOVAL || 461 vap->va_bytes != VNOVAL) 462 error = EINVAL; 463 464 if (error == 0 && (vap->va_flags != VNOVAL)) 465 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 466 467 if (error == 0 && (vap->va_size != VNOVAL)) 468 error = tmpfs_chsize(vp, vap->va_size, cred, l); 469 470 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 471 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 472 473 if (error == 0 && (vap->va_mode != VNOVAL)) 474 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 475 476 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 477 || GOODTIME(&vap->va_birthtime))) 478 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 479 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 480 return 0; 481 482 /* Update the node times. We give preference to the error codes 483 * generated by this function rather than the ones that may arise 484 * from tmpfs_update. */ 485 tmpfs_update(vp, NULL, NULL, NULL, 0); 486 487 KASSERT(VOP_ISLOCKED(vp)); 488 489 return error; 490 } 491 492 /* --------------------------------------------------------------------- */ 493 494 int 495 tmpfs_read(void *v) 496 { 497 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 498 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 499 500 int error; 501 int flags; 502 struct tmpfs_node *node; 503 struct uvm_object *uobj; 504 505 KASSERT(VOP_ISLOCKED(vp)); 506 507 node = VP_TO_TMPFS_NODE(vp); 508 509 if (vp->v_type != VREG) { 510 error = EISDIR; 511 goto out; 512 } 513 514 if (uio->uio_offset < 0) { 515 error = EINVAL; 516 goto out; 517 } 518 519 node->tn_status |= TMPFS_NODE_ACCESSED; 520 521 uobj = node->tn_spec.tn_reg.tn_aobj; 522 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 523 error = 0; 524 while (error == 0 && uio->uio_resid > 0) { 525 vsize_t len; 526 void *win; 527 528 if (node->tn_size <= uio->uio_offset) 529 break; 530 531 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 532 if (len == 0) 533 break; 534 535 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 536 UBC_READ); 537 error = uiomove(win, len, uio); 538 ubc_release(win, flags); 539 } 540 541 out: 542 KASSERT(VOP_ISLOCKED(vp)); 543 544 return error; 545 } 546 547 /* --------------------------------------------------------------------- */ 548 549 int 550 tmpfs_write(void *v) 551 { 552 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 553 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 554 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 555 556 bool extended; 557 int error; 558 int flags; 559 off_t oldsize; 560 struct tmpfs_node *node; 561 struct uvm_object *uobj; 562 563 KASSERT(VOP_ISLOCKED(vp)); 564 565 node = VP_TO_TMPFS_NODE(vp); 566 oldsize = node->tn_size; 567 568 if (uio->uio_offset < 0 || vp->v_type != VREG) { 569 error = EINVAL; 570 goto out; 571 } 572 573 if (uio->uio_resid == 0) { 574 error = 0; 575 goto out; 576 } 577 578 if (ioflag & IO_APPEND) 579 uio->uio_offset = node->tn_size; 580 581 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 582 if (extended) { 583 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 584 if (error != 0) 585 goto out; 586 } 587 588 uobj = node->tn_spec.tn_reg.tn_aobj; 589 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 590 error = 0; 591 while (error == 0 && uio->uio_resid > 0) { 592 vsize_t len; 593 void *win; 594 595 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 596 if (len == 0) 597 break; 598 599 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 600 UBC_WRITE); 601 error = uiomove(win, len, uio); 602 ubc_release(win, flags); 603 } 604 605 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 606 (extended ? TMPFS_NODE_CHANGED : 0); 607 608 if (error != 0) 609 (void)tmpfs_reg_resize(vp, oldsize); 610 611 VN_KNOTE(vp, NOTE_WRITE); 612 613 out: 614 KASSERT(VOP_ISLOCKED(vp)); 615 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 616 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 617 618 return error; 619 } 620 621 /* --------------------------------------------------------------------- */ 622 623 int 624 tmpfs_fsync(void *v) 625 { 626 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 627 628 KASSERT(VOP_ISLOCKED(vp)); 629 630 tmpfs_update(vp, NULL, NULL, NULL, 0); 631 632 return 0; 633 } 634 635 /* --------------------------------------------------------------------- */ 636 637 int 638 tmpfs_remove(void *v) 639 { 640 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 641 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 642 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 643 644 int error; 645 struct tmpfs_dirent *de; 646 struct tmpfs_mount *tmp; 647 struct tmpfs_node *dnode; 648 struct tmpfs_node *node; 649 650 KASSERT(VOP_ISLOCKED(dvp)); 651 KASSERT(VOP_ISLOCKED(vp)); 652 653 if (vp->v_type == VDIR) { 654 error = EPERM; 655 goto out; 656 } 657 658 dnode = VP_TO_TMPFS_DIR(dvp); 659 node = VP_TO_TMPFS_NODE(vp); 660 tmp = VFS_TO_TMPFS(vp->v_mount); 661 de = tmpfs_dir_lookup(dnode, cnp); 662 if (de == NULL) { 663 error = ENOENT; 664 goto out; 665 } 666 KASSERT(de->td_node == node); 667 668 /* Files marked as immutable or append-only cannot be deleted. */ 669 if (node->tn_flags & (IMMUTABLE | APPEND)) { 670 error = EPERM; 671 goto out; 672 } 673 674 /* Remove the entry from the directory; as it is a file, we do not 675 * have to change the number of hard links of the directory. */ 676 tmpfs_dir_detach(dvp, de); 677 678 /* Free the directory entry we just deleted. Note that the node 679 * referred by it will not be removed until the vnode is really 680 * reclaimed. */ 681 tmpfs_free_dirent(tmp, de, true); 682 683 error = 0; 684 685 out: 686 vput(vp); 687 if (dvp == vp) 688 vrele(dvp); 689 else 690 vput(dvp); 691 692 return error; 693 } 694 695 /* --------------------------------------------------------------------- */ 696 697 int 698 tmpfs_link(void *v) 699 { 700 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 701 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 702 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 703 704 int error; 705 struct tmpfs_dirent *de; 706 struct tmpfs_node *dnode; 707 struct tmpfs_node *node; 708 709 KASSERT(VOP_ISLOCKED(dvp)); 710 KASSERT(cnp->cn_flags & HASBUF); 711 KASSERT(dvp != vp); /* XXX When can this be false? */ 712 713 dnode = VP_TO_TMPFS_DIR(dvp); 714 node = VP_TO_TMPFS_NODE(vp); 715 716 /* Lock vp because we will need to run tmpfs_update over it, which 717 * needs the vnode to be locked. */ 718 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 719 if (error != 0) 720 goto out1; 721 722 /* XXX: Why aren't the following two tests done by the caller? */ 723 724 /* Hard links of directories are forbidden. */ 725 if (vp->v_type == VDIR) { 726 error = EPERM; 727 goto out; 728 } 729 730 /* Cannot create cross-device links. */ 731 if (dvp->v_mount != vp->v_mount) { 732 error = EXDEV; 733 goto out; 734 } 735 736 /* Ensure that we do not overflow the maximum number of links imposed 737 * by the system. */ 738 KASSERT(node->tn_links <= LINK_MAX); 739 if (node->tn_links == LINK_MAX) { 740 error = EMLINK; 741 goto out; 742 } 743 744 /* We cannot create links of files marked immutable or append-only. */ 745 if (node->tn_flags & (IMMUTABLE | APPEND)) { 746 error = EPERM; 747 goto out; 748 } 749 750 /* Allocate a new directory entry to represent the node. */ 751 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 752 cnp->cn_nameptr, cnp->cn_namelen, &de); 753 if (error != 0) 754 goto out; 755 756 /* Insert the new directory entry into the appropriate directory. */ 757 tmpfs_dir_attach(dvp, de); 758 759 /* vp link count has changed, so update node times. */ 760 node->tn_status |= TMPFS_NODE_CHANGED; 761 tmpfs_update(vp, NULL, NULL, NULL, 0); 762 763 error = 0; 764 765 out: 766 VOP_UNLOCK(vp, 0); 767 out1: 768 PNBUF_PUT(cnp->cn_pnbuf); 769 770 vput(dvp); 771 772 return error; 773 } 774 775 /* --------------------------------------------------------------------- */ 776 777 int 778 tmpfs_rename(void *v) 779 { 780 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 781 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 782 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 783 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 784 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 785 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 786 787 char *newname; 788 int error; 789 struct tmpfs_dirent *de, *de2; 790 struct tmpfs_mount *tmp; 791 struct tmpfs_node *fdnode; 792 struct tmpfs_node *fnode; 793 struct tmpfs_node *tnode; 794 struct tmpfs_node *tdnode; 795 size_t namelen; 796 797 KASSERT(VOP_ISLOCKED(tdvp)); 798 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 799 KASSERT(fcnp->cn_flags & HASBUF); 800 KASSERT(tcnp->cn_flags & HASBUF); 801 802 newname = NULL; 803 namelen = 0; 804 tmp = NULL; 805 806 /* Disallow cross-device renames. */ 807 if (fvp->v_mount != tdvp->v_mount || 808 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 809 error = EXDEV; 810 goto out_unlocked; 811 } 812 813 fnode = VP_TO_TMPFS_NODE(fvp); 814 fdnode = VP_TO_TMPFS_DIR(fdvp); 815 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 816 tdnode = VP_TO_TMPFS_DIR(tdvp); 817 tmp = VFS_TO_TMPFS(tdvp->v_mount); 818 819 /* If we need to move the directory between entries, lock the 820 * source so that we can safely operate on it. */ 821 822 /* XXX: this is a potential locking order violation! */ 823 if (fdnode != tdnode) { 824 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 825 if (error != 0) 826 goto out_unlocked; 827 } 828 829 de = tmpfs_dir_lookup(fdnode, fcnp); 830 if (de == NULL) { 831 error = ENOENT; 832 goto out; 833 } 834 KASSERT(de->td_node == fnode); 835 836 /* If source and target are the same file, there is nothing to do. */ 837 if (fvp == tvp) { 838 error = 0; 839 goto out; 840 } 841 842 /* Avoid manipulating '.' and '..' entries. */ 843 if (de == NULL) { 844 KASSERT(fvp->v_type == VDIR); 845 error = EINVAL; 846 goto out; 847 } 848 KASSERT(de->td_node == fnode); 849 850 /* If replacing an existing entry, ensure we can do the operation. */ 851 if (tvp != NULL) { 852 KASSERT(tnode != NULL); 853 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 854 if (tnode->tn_size > 0) { 855 error = ENOTEMPTY; 856 goto out; 857 } 858 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 859 error = ENOTDIR; 860 goto out; 861 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 862 error = EISDIR; 863 goto out; 864 } else { 865 KASSERT(fnode->tn_type != VDIR && 866 tnode->tn_type != VDIR); 867 } 868 } 869 870 /* Ensure that we have enough memory to hold the new name, if it 871 * has to be changed. */ 872 namelen = tcnp->cn_namelen; 873 if (fcnp->cn_namelen != tcnp->cn_namelen || 874 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 875 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 876 if (newname == NULL) { 877 error = ENOSPC; 878 goto out; 879 } 880 } 881 882 /* If the node is being moved to another directory, we have to do 883 * the move. */ 884 if (fdnode != tdnode) { 885 /* In case we are moving a directory, we have to adjust its 886 * parent to point to the new parent. */ 887 if (de->td_node->tn_type == VDIR) { 888 struct tmpfs_node *n; 889 890 /* Ensure the target directory is not a child of the 891 * directory being moved. Otherwise, we'd end up 892 * with stale nodes. */ 893 n = tdnode; 894 while (n != n->tn_spec.tn_dir.tn_parent) { 895 if (n == fnode) { 896 error = EINVAL; 897 goto out; 898 } 899 n = n->tn_spec.tn_dir.tn_parent; 900 } 901 902 /* Adjust the parent pointer. */ 903 TMPFS_VALIDATE_DIR(fnode); 904 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 905 906 /* As a result of changing the target of the '..' 907 * entry, the link count of the source and target 908 * directories has to be adjusted. */ 909 fdnode->tn_links--; 910 tdnode->tn_links++; 911 } 912 913 /* Do the move: just remove the entry from the source directory 914 * and insert it into the target one. */ 915 tmpfs_dir_detach(fdvp, de); 916 tmpfs_dir_attach(tdvp, de); 917 918 /* Notify listeners of fdvp about the change in the directory. 919 * We can do it at this point because we aren't touching fdvp 920 * any more below. */ 921 VN_KNOTE(fdvp, NOTE_WRITE); 922 } 923 924 /* If we are overwriting an entry, we have to remove the old one 925 * from the target directory. */ 926 if (tvp != NULL) { 927 KASSERT(tnode != NULL); 928 929 /* Remove the old entry from the target directory. 930 * Note! This relies on tmpfs_dir_attach() putting the new 931 * node on the end of the target's node list. */ 932 de2 = tmpfs_dir_lookup(tdnode, tcnp); 933 KASSERT(de2 != NULL); 934 KASSERT(de2->td_node == tnode); 935 tmpfs_dir_detach(tdvp, de2); 936 937 /* Free the directory entry we just deleted. Note that the 938 * node referred by it will not be removed until the vnode is 939 * really reclaimed. */ 940 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 941 } 942 943 /* If the name has changed, we need to make it effective by changing 944 * it in the directory entry. */ 945 if (newname != NULL) { 946 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 947 KASSERT(tcnp->cn_namelen < 0xffff); 948 949 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 950 de->td_namelen); 951 de->td_namelen = (uint16_t)namelen; 952 memcpy(newname, tcnp->cn_nameptr, namelen); 953 de->td_name = newname; 954 newname = NULL; 955 956 fnode->tn_status |= TMPFS_NODE_CHANGED; 957 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 958 } 959 960 /* Notify listeners of tdvp about the change in the directory (either 961 * because a new entry was added or because one was removed) and 962 * listeners of fvp about the rename. */ 963 VN_KNOTE(tdvp, NOTE_WRITE); 964 VN_KNOTE(fvp, NOTE_RENAME); 965 966 error = 0; 967 968 out: 969 if (fdnode != tdnode) 970 VOP_UNLOCK(fdvp, 0); 971 972 out_unlocked: 973 /* Release target nodes. */ 974 if (tdvp == tvp) 975 vrele(tdvp); 976 else 977 vput(tdvp); 978 if (tvp != NULL) 979 vput(tvp); 980 981 /* Release source nodes. */ 982 vrele(fdvp); 983 vrele(fvp); 984 985 if (newname != NULL) 986 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 987 988 return error; 989 } 990 991 /* --------------------------------------------------------------------- */ 992 993 int 994 tmpfs_mkdir(void *v) 995 { 996 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 997 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 998 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 999 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1000 1001 KASSERT(vap->va_type == VDIR); 1002 1003 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1004 } 1005 1006 /* --------------------------------------------------------------------- */ 1007 1008 int 1009 tmpfs_rmdir(void *v) 1010 { 1011 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1012 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1013 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1014 1015 int error; 1016 struct tmpfs_dirent *de; 1017 struct tmpfs_mount *tmp; 1018 struct tmpfs_node *dnode; 1019 struct tmpfs_node *node; 1020 1021 KASSERT(VOP_ISLOCKED(dvp)); 1022 KASSERT(VOP_ISLOCKED(vp)); 1023 1024 tmp = VFS_TO_TMPFS(dvp->v_mount); 1025 dnode = VP_TO_TMPFS_DIR(dvp); 1026 node = VP_TO_TMPFS_DIR(vp); 1027 error = 0; 1028 1029 /* Directories with more than two entries ('.' and '..') cannot be 1030 * removed. */ 1031 if (node->tn_size > 0) { 1032 error = ENOTEMPTY; 1033 goto out; 1034 } 1035 1036 /* This invariant holds only if we are not trying to remove "..". 1037 * We checked for that above so this is safe now. */ 1038 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1039 1040 /* Get the directory entry associated with node (vp). */ 1041 de = tmpfs_dir_lookup(dnode, cnp); 1042 if (de == NULL) { 1043 error = ENOENT; 1044 goto out; 1045 } 1046 KASSERT(de->td_node == node); 1047 1048 /* Check flags to see if we are allowed to remove the directory. */ 1049 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1050 error = EPERM; 1051 goto out; 1052 } 1053 1054 /* Detach the directory entry from the directory (dnode). */ 1055 tmpfs_dir_detach(dvp, de); 1056 1057 node->tn_links--; 1058 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1059 TMPFS_NODE_MODIFIED; 1060 node->tn_spec.tn_dir.tn_parent->tn_links--; 1061 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1062 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1063 1064 /* Release the parent. */ 1065 cache_purge(dvp); /* XXX Is this needed? */ 1066 1067 /* Free the directory entry we just deleted. Note that the node 1068 * referred by it will not be removed until the vnode is really 1069 * reclaimed. */ 1070 tmpfs_free_dirent(tmp, de, true); 1071 1072 KASSERT(node->tn_links == 0); 1073 out: 1074 /* Release the nodes. */ 1075 vput(dvp); 1076 vput(vp); 1077 1078 return error; 1079 } 1080 1081 /* --------------------------------------------------------------------- */ 1082 1083 int 1084 tmpfs_symlink(void *v) 1085 { 1086 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1087 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1088 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1089 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1090 char *target = ((struct vop_symlink_args *)v)->a_target; 1091 1092 KASSERT(vap->va_type == VLNK); 1093 1094 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1095 } 1096 1097 /* --------------------------------------------------------------------- */ 1098 1099 int 1100 tmpfs_readdir(void *v) 1101 { 1102 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1103 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1104 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1105 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1106 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1107 1108 int error; 1109 off_t startoff; 1110 off_t cnt; 1111 struct tmpfs_node *node; 1112 1113 KASSERT(VOP_ISLOCKED(vp)); 1114 1115 /* This operation only makes sense on directory nodes. */ 1116 if (vp->v_type != VDIR) { 1117 error = ENOTDIR; 1118 goto out; 1119 } 1120 1121 node = VP_TO_TMPFS_DIR(vp); 1122 1123 startoff = uio->uio_offset; 1124 1125 cnt = 0; 1126 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1127 error = tmpfs_dir_getdotdent(node, uio); 1128 if (error == -1) { 1129 error = 0; 1130 goto outok; 1131 } else if (error != 0) 1132 goto outok; 1133 cnt++; 1134 } 1135 1136 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1137 error = tmpfs_dir_getdotdotdent(node, uio); 1138 if (error == -1) { 1139 error = 0; 1140 goto outok; 1141 } else if (error != 0) 1142 goto outok; 1143 cnt++; 1144 } 1145 1146 error = tmpfs_dir_getdents(node, uio, &cnt); 1147 if (error == -1) 1148 error = 0; 1149 KASSERT(error >= 0); 1150 1151 outok: 1152 /* This label assumes that startoff has been 1153 * initialized. If the compiler didn't spit out warnings, we'd 1154 * simply make this one be 'out' and drop 'outok'. */ 1155 1156 if (eofflag != NULL) 1157 *eofflag = 1158 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1159 1160 /* Update NFS-related variables. */ 1161 if (error == 0 && cookies != NULL && ncookies != NULL) { 1162 off_t i; 1163 off_t off = startoff; 1164 struct tmpfs_dirent *de = NULL; 1165 1166 *ncookies = cnt; 1167 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1168 1169 for (i = 0; i < cnt; i++) { 1170 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1171 if (off == TMPFS_DIRCOOKIE_DOT) { 1172 off = TMPFS_DIRCOOKIE_DOTDOT; 1173 } else { 1174 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1175 de = TAILQ_FIRST(&node->tn_spec. 1176 tn_dir.tn_dir); 1177 } else if (de != NULL) { 1178 de = TAILQ_NEXT(de, td_entries); 1179 } else { 1180 de = tmpfs_dir_lookupbycookie(node, 1181 off); 1182 KASSERT(de != NULL); 1183 de = TAILQ_NEXT(de, td_entries); 1184 } 1185 if (de == NULL) { 1186 off = TMPFS_DIRCOOKIE_EOF; 1187 } else { 1188 off = tmpfs_dircookie(de); 1189 } 1190 } 1191 1192 (*cookies)[i] = off; 1193 } 1194 KASSERT(uio->uio_offset == off); 1195 } 1196 1197 out: 1198 KASSERT(VOP_ISLOCKED(vp)); 1199 1200 return error; 1201 } 1202 1203 /* --------------------------------------------------------------------- */ 1204 1205 int 1206 tmpfs_readlink(void *v) 1207 { 1208 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1209 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1210 1211 int error; 1212 struct tmpfs_node *node; 1213 1214 KASSERT(VOP_ISLOCKED(vp)); 1215 KASSERT(uio->uio_offset == 0); 1216 KASSERT(vp->v_type == VLNK); 1217 1218 node = VP_TO_TMPFS_NODE(vp); 1219 1220 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1221 MIN(node->tn_size, uio->uio_resid), uio); 1222 node->tn_status |= TMPFS_NODE_ACCESSED; 1223 1224 KASSERT(VOP_ISLOCKED(vp)); 1225 1226 return error; 1227 } 1228 1229 /* --------------------------------------------------------------------- */ 1230 1231 int 1232 tmpfs_inactive(void *v) 1233 { 1234 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1235 1236 struct tmpfs_node *node; 1237 1238 KASSERT(VOP_ISLOCKED(vp)); 1239 1240 node = VP_TO_TMPFS_NODE(vp); 1241 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1242 VOP_UNLOCK(vp, 0); 1243 1244 return 0; 1245 } 1246 1247 /* --------------------------------------------------------------------- */ 1248 1249 int 1250 tmpfs_reclaim(void *v) 1251 { 1252 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1253 1254 struct tmpfs_mount *tmp; 1255 struct tmpfs_node *node; 1256 1257 node = VP_TO_TMPFS_NODE(vp); 1258 tmp = VFS_TO_TMPFS(vp->v_mount); 1259 1260 cache_purge(vp); 1261 tmpfs_free_vp(vp); 1262 1263 /* If the node referenced by this vnode was deleted by the user, 1264 * we must free its associated data structures (now that the vnode 1265 * is being reclaimed). */ 1266 if (node->tn_links == 0) 1267 tmpfs_free_node(tmp, node); 1268 1269 KASSERT(vp->v_data == NULL); 1270 1271 return 0; 1272 } 1273 1274 /* --------------------------------------------------------------------- */ 1275 1276 int 1277 tmpfs_print(void *v) 1278 { 1279 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1280 1281 struct tmpfs_node *node; 1282 1283 node = VP_TO_TMPFS_NODE(vp); 1284 1285 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1286 node, node->tn_flags, node->tn_links); 1287 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1288 ", status 0x%x\n", 1289 node->tn_mode, node->tn_uid, node->tn_gid, 1290 (uintmax_t)node->tn_size, node->tn_status); 1291 if (vp->v_type == VFIFO) 1292 fifo_printinfo(vp); 1293 printf("\n"); 1294 1295 return 0; 1296 } 1297 1298 /* --------------------------------------------------------------------- */ 1299 1300 int 1301 tmpfs_pathconf(void *v) 1302 { 1303 int name = ((struct vop_pathconf_args *)v)->a_name; 1304 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1305 1306 int error; 1307 1308 error = 0; 1309 1310 switch (name) { 1311 case _PC_LINK_MAX: 1312 *retval = LINK_MAX; 1313 break; 1314 1315 case _PC_NAME_MAX: 1316 *retval = NAME_MAX; 1317 break; 1318 1319 case _PC_PATH_MAX: 1320 *retval = PATH_MAX; 1321 break; 1322 1323 case _PC_PIPE_BUF: 1324 *retval = PIPE_BUF; 1325 break; 1326 1327 case _PC_CHOWN_RESTRICTED: 1328 *retval = 1; 1329 break; 1330 1331 case _PC_NO_TRUNC: 1332 *retval = 1; 1333 break; 1334 1335 case _PC_SYNC_IO: 1336 *retval = 1; 1337 break; 1338 1339 case _PC_FILESIZEBITS: 1340 *retval = 0; /* XXX Don't know which value should I return. */ 1341 break; 1342 1343 default: 1344 error = EINVAL; 1345 } 1346 1347 return error; 1348 } 1349 1350 /* --------------------------------------------------------------------- */ 1351 1352 int 1353 tmpfs_advlock(void *v) 1354 { 1355 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1356 1357 struct tmpfs_node *node; 1358 1359 node = VP_TO_TMPFS_NODE(vp); 1360 1361 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1362 } 1363 1364 /* --------------------------------------------------------------------- */ 1365 1366 int 1367 tmpfs_getpages(void *v) 1368 { 1369 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1370 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1371 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1372 int *count = ((struct vop_getpages_args *)v)->a_count; 1373 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1374 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1375 int advice = ((struct vop_getpages_args *)v)->a_advice; 1376 int flags = ((struct vop_getpages_args *)v)->a_flags; 1377 1378 int error; 1379 int i; 1380 struct tmpfs_node *node; 1381 struct uvm_object *uobj; 1382 int npages = *count; 1383 1384 KASSERT(vp->v_type == VREG); 1385 KASSERT(mutex_owned(&vp->v_interlock)); 1386 1387 node = VP_TO_TMPFS_NODE(vp); 1388 uobj = node->tn_spec.tn_reg.tn_aobj; 1389 1390 /* We currently don't rely on PGO_PASTEOF. */ 1391 1392 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1393 if ((flags & PGO_LOCKED) == 0) 1394 mutex_exit(&vp->v_interlock); 1395 return EINVAL; 1396 } 1397 1398 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1399 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1400 } 1401 1402 if ((flags & PGO_LOCKED) != 0) 1403 return EBUSY; 1404 1405 if ((flags & PGO_NOTIMESTAMP) == 0) { 1406 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1407 node->tn_status |= TMPFS_NODE_ACCESSED; 1408 1409 if ((access_type & VM_PROT_WRITE) != 0) 1410 node->tn_status |= TMPFS_NODE_MODIFIED; 1411 } 1412 1413 mutex_exit(&vp->v_interlock); 1414 1415 /* 1416 * Make sure that the array on which we will store the 1417 * gotten pages is clean. Otherwise uao_get (pointed to by 1418 * the pgo_get below) gets confused and does not return the 1419 * appropriate pages. 1420 * 1421 * XXX This shall be revisited when kern/32166 is addressed 1422 * because the loop to clean m[i] will most likely be redundant 1423 * as well as the PGO_ALLPAGES flag. 1424 */ 1425 if (m != NULL) 1426 for (i = 0; i < npages; i++) 1427 m[i] = NULL; 1428 mutex_enter(&uobj->vmobjlock); 1429 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1430 access_type, advice, flags | PGO_ALLPAGES); 1431 #if defined(DEBUG) 1432 { 1433 /* Make sure that all the pages we return are valid. */ 1434 int dbgi; 1435 if (error == 0 && m != NULL) 1436 for (dbgi = 0; dbgi < npages; dbgi++) 1437 KASSERT(m[dbgi] != NULL); 1438 } 1439 #endif 1440 1441 return error; 1442 } 1443 1444 /* --------------------------------------------------------------------- */ 1445 1446 int 1447 tmpfs_putpages(void *v) 1448 { 1449 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1450 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1451 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1452 int flags = ((struct vop_putpages_args *)v)->a_flags; 1453 1454 int error; 1455 struct tmpfs_node *node; 1456 struct uvm_object *uobj; 1457 1458 KASSERT(mutex_owned(&vp->v_interlock)); 1459 1460 node = VP_TO_TMPFS_NODE(vp); 1461 1462 if (vp->v_type != VREG) { 1463 mutex_exit(&vp->v_interlock); 1464 return 0; 1465 } 1466 1467 uobj = node->tn_spec.tn_reg.tn_aobj; 1468 mutex_exit(&vp->v_interlock); 1469 1470 mutex_enter(&uobj->vmobjlock); 1471 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1472 1473 /* XXX mtime */ 1474 1475 return error; 1476 } 1477