1 /* $NetBSD: tmpfs_vnops.c,v 1.20 2006/01/26 20:07:34 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * tmpfs vnode interface. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.20 2006/01/26 20:07:34 jmmv Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/event.h> 51 #include <sys/malloc.h> 52 #include <sys/namei.h> 53 #include <sys/proc.h> 54 #include <sys/stat.h> 55 #include <sys/uio.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 #include <sys/lockf.h> 59 60 #include <uvm/uvm.h> 61 62 #include <miscfs/fifofs/fifo.h> 63 #include <fs/tmpfs/tmpfs_vnops.h> 64 #include <fs/tmpfs/tmpfs.h> 65 66 /* --------------------------------------------------------------------- */ 67 68 /* 69 * vnode operations vector used for files stored in a tmpfs file system. 70 */ 71 int (**tmpfs_vnodeop_p)(void *); 72 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 73 { &vop_default_desc, vn_default_error }, 74 { &vop_lookup_desc, tmpfs_lookup }, 75 { &vop_create_desc, tmpfs_create }, 76 { &vop_mknod_desc, tmpfs_mknod }, 77 { &vop_open_desc, tmpfs_open }, 78 { &vop_close_desc, tmpfs_close }, 79 { &vop_access_desc, tmpfs_access }, 80 { &vop_getattr_desc, tmpfs_getattr }, 81 { &vop_setattr_desc, tmpfs_setattr }, 82 { &vop_read_desc, tmpfs_read }, 83 { &vop_write_desc, tmpfs_write }, 84 { &vop_ioctl_desc, tmpfs_ioctl }, 85 { &vop_fcntl_desc, tmpfs_fcntl }, 86 { &vop_poll_desc, tmpfs_poll }, 87 { &vop_kqfilter_desc, tmpfs_kqfilter }, 88 { &vop_revoke_desc, tmpfs_revoke }, 89 { &vop_mmap_desc, tmpfs_mmap }, 90 { &vop_fsync_desc, tmpfs_fsync }, 91 { &vop_seek_desc, tmpfs_seek }, 92 { &vop_remove_desc, tmpfs_remove }, 93 { &vop_link_desc, tmpfs_link }, 94 { &vop_rename_desc, tmpfs_rename }, 95 { &vop_mkdir_desc, tmpfs_mkdir }, 96 { &vop_rmdir_desc, tmpfs_rmdir }, 97 { &vop_symlink_desc, tmpfs_symlink }, 98 { &vop_readdir_desc, tmpfs_readdir }, 99 { &vop_readlink_desc, tmpfs_readlink }, 100 { &vop_abortop_desc, tmpfs_abortop }, 101 { &vop_inactive_desc, tmpfs_inactive }, 102 { &vop_reclaim_desc, tmpfs_reclaim }, 103 { &vop_lock_desc, tmpfs_lock }, 104 { &vop_unlock_desc, tmpfs_unlock }, 105 { &vop_bmap_desc, tmpfs_bmap }, 106 { &vop_strategy_desc, tmpfs_strategy }, 107 { &vop_print_desc, tmpfs_print }, 108 { &vop_pathconf_desc, tmpfs_pathconf }, 109 { &vop_islocked_desc, tmpfs_islocked }, 110 { &vop_advlock_desc, tmpfs_advlock }, 111 { &vop_lease_desc, tmpfs_lease }, 112 { &vop_bwrite_desc, tmpfs_bwrite }, 113 { &vop_getpages_desc, tmpfs_getpages }, 114 { &vop_putpages_desc, tmpfs_putpages }, 115 { NULL, NULL } 116 }; 117 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 118 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 119 120 /* --------------------------------------------------------------------- */ 121 122 int 123 tmpfs_lookup(void *v) 124 { 125 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 126 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 127 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 128 129 int error; 130 struct tmpfs_dirent *de; 131 struct tmpfs_node *dnode; 132 133 KASSERT(VOP_ISLOCKED(dvp)); 134 135 dnode = VP_TO_TMPFS_DIR(dvp); 136 *vpp = NULL; 137 138 /* Check accessibility of requested node as a first step. */ 139 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp); 140 if (error != 0) 141 goto out; 142 143 /* If requesting the last path component on a read-only file system 144 * with a write operation, deny it. */ 145 if ((cnp->cn_flags & ISLASTCN) && 146 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 147 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 148 error = EROFS; 149 goto out; 150 } 151 152 /* Avoid doing a linear scan of the directory if the requested 153 * directory/name couple is already in the cache. */ 154 error = cache_lookup(dvp, vpp, cnp); 155 if (error >= 0) 156 goto out; 157 158 /* We cannot be requesting the parent directory of the root node. */ 159 KASSERT(IMPLIES(dnode->tn_type == VDIR && 160 dnode->tn_parent == dnode, !(cnp->cn_flags & ISDOTDOT))); 161 162 if (cnp->cn_flags & ISDOTDOT) { 163 VOP_UNLOCK(dvp, 0); 164 165 /* Allocate a new vnode on the matching entry. */ 166 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_parent, vpp); 167 168 if (cnp->cn_flags & LOCKPARENT && 169 cnp->cn_flags & ISLASTCN) { 170 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 171 cnp->cn_flags |= PDIRUNLOCK; 172 } 173 dnode->tn_parent->tn_lookup_dirent = NULL; 174 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 175 VREF(dvp); 176 *vpp = dvp; 177 dnode->tn_lookup_dirent = NULL; 178 error = 0; 179 } else { 180 de = tmpfs_dir_lookup(dnode, cnp); 181 if (de == NULL) { 182 /* The entry was not found in the directory. 183 * This is OK iff we are creating or renaming an 184 * entry and are working on the last component of 185 * the path name. */ 186 if ((cnp->cn_flags & ISLASTCN) && 187 (cnp->cn_nameiop == CREATE || \ 188 cnp->cn_nameiop == RENAME)) { 189 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 190 cnp->cn_lwp); 191 if (error != 0) 192 goto out; 193 194 /* Keep the component name in the buffer for 195 * future uses. */ 196 cnp->cn_flags |= SAVENAME; 197 198 error = EJUSTRETURN; 199 } else 200 error = ENOENT; 201 } else { 202 struct tmpfs_node *tnode; 203 204 /* The entry was found, so get its associated 205 * tmpfs_node. */ 206 tnode = de->td_node; 207 208 /* If we are not at the last path component and 209 * found a non-directory or non-link entry (which 210 * may itself be pointing to a directory), raise 211 * an error. */ 212 if ((tnode->tn_type != VDIR && 213 tnode->tn_type != VLNK) && 214 !(cnp->cn_flags & ISLASTCN)) { 215 error = ENOTDIR; 216 goto out; 217 } 218 219 /* If we are deleting or renaming the entry, keep 220 * track of its tmpfs_dirent so that it can be 221 * easily deleted later. */ 222 if ((cnp->cn_flags & ISLASTCN) && 223 (cnp->cn_nameiop == DELETE || 224 cnp->cn_nameiop == RENAME)) { 225 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 226 cnp->cn_lwp); 227 if (error != 0) 228 goto out; 229 /* TODO: Check sticky bit. */ 230 tnode->tn_lookup_dirent = de; 231 } 232 233 /* Allocate a new vnode on the matching entry. */ 234 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 235 236 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 237 !(cnp->cn_flags & ISLASTCN))) 238 VOP_UNLOCK(dvp, 0); 239 } 240 } 241 242 /* Store the result of this lookup in the cache. Avoid this if the 243 * request was for creation, as it does not improve timings on 244 * emprical tests. */ 245 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 246 cache_enter(dvp, *vpp, cnp); 247 248 out: 249 /* If there were no errors, *vpp cannot be null and it must be 250 * locked. */ 251 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 252 253 /* dvp has to be locked if: 254 * - There were errors and relocking of dvp did not fail. 255 * - We are doing a '..' lookup, relocking of dvp did not fail 256 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 257 * - LOCKPARENT and ISLASTCN are set. */ 258 KASSERT(IMPLIES( 259 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 260 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 261 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 262 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 263 , 264 VOP_ISLOCKED(dvp))); 265 266 return error; 267 } 268 269 /* --------------------------------------------------------------------- */ 270 271 int 272 tmpfs_create(void *v) 273 { 274 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 275 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 276 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 277 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 278 279 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 280 281 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 282 } 283 /* --------------------------------------------------------------------- */ 284 285 int 286 tmpfs_mknod(void *v) 287 { 288 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 289 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 290 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 291 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 292 293 if (vap->va_type != VBLK && vap->va_type != VCHR && 294 vap->va_type != VFIFO) 295 return EINVAL; 296 297 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 298 } 299 300 /* --------------------------------------------------------------------- */ 301 302 int 303 tmpfs_open(void *v) 304 { 305 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 306 int mode = ((struct vop_open_args *)v)->a_mode; 307 308 int error; 309 struct tmpfs_node *node; 310 311 KASSERT(VOP_ISLOCKED(vp)); 312 313 node = VP_TO_TMPFS_NODE(vp); 314 KASSERT(node->tn_links > 0); 315 316 /* If the file is marked append-only, deny write requests. */ 317 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 318 error = EPERM; 319 else 320 error = 0; 321 322 KASSERT(VOP_ISLOCKED(vp)); 323 324 return error; 325 } 326 327 /* --------------------------------------------------------------------- */ 328 329 int 330 tmpfs_close(void *v) 331 { 332 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 333 334 struct tmpfs_node *node; 335 336 KASSERT(VOP_ISLOCKED(vp)); 337 338 node = VP_TO_TMPFS_NODE(vp); 339 340 if (node->tn_links > 0) { 341 /* Update node times. No need to do it if the node has 342 * been deleted, because it will vanish after we return. */ 343 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 344 } 345 346 return 0; 347 } 348 349 /* --------------------------------------------------------------------- */ 350 351 int 352 tmpfs_access(void *v) 353 { 354 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 355 int mode = ((struct vop_access_args *)v)->a_mode; 356 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 357 358 int error; 359 struct tmpfs_node *node; 360 361 KASSERT(VOP_ISLOCKED(vp)); 362 363 node = VP_TO_TMPFS_NODE(vp); 364 365 switch (vp->v_type) { 366 case VDIR: 367 /* FALLTHROUGH */ 368 case VLNK: 369 /* FALLTHROUGH */ 370 case VREG: 371 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 372 error = EROFS; 373 goto out; 374 } 375 break; 376 377 case VBLK: 378 /* FALLTHROUGH */ 379 case VCHR: 380 /* FALLTHROUGH */ 381 case VSOCK: 382 /* FALLTHROUGH */ 383 case VFIFO: 384 break; 385 386 default: 387 error = EINVAL; 388 goto out; 389 } 390 391 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 392 error = EPERM; 393 goto out; 394 } 395 396 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 397 node->tn_gid, mode, cred); 398 399 out: 400 KASSERT(VOP_ISLOCKED(vp)); 401 402 return error; 403 } 404 405 /* --------------------------------------------------------------------- */ 406 407 int 408 tmpfs_getattr(void *v) 409 { 410 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 411 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 412 413 struct tmpfs_node *node; 414 415 node = VP_TO_TMPFS_NODE(vp); 416 417 VATTR_NULL(vap); 418 419 tmpfs_itimes(vp, NULL, NULL); 420 421 vap->va_type = vp->v_type; 422 vap->va_mode = node->tn_mode; 423 vap->va_nlink = node->tn_links; 424 vap->va_uid = node->tn_uid; 425 vap->va_gid = node->tn_gid; 426 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 427 vap->va_fileid = node->tn_id; 428 vap->va_size = node->tn_size; 429 vap->va_blocksize = PAGE_SIZE; 430 vap->va_atime = node->tn_atime; 431 vap->va_mtime = node->tn_mtime; 432 vap->va_ctime = node->tn_ctime; 433 vap->va_birthtime = node->tn_birthtime; 434 vap->va_gen = node->tn_gen; 435 vap->va_flags = node->tn_flags; 436 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 437 node->tn_rdev : VNOVAL; 438 vap->va_bytes = round_page(node->tn_size); 439 vap->va_filerev = VNOVAL; 440 vap->va_vaflags = 0; 441 vap->va_spare = VNOVAL; /* XXX */ 442 443 return 0; 444 } 445 446 /* --------------------------------------------------------------------- */ 447 448 /* XXX Should this operation be atomic? I think it should, but code in 449 * XXX other places (e.g., ufs) doesn't seem to be... */ 450 int 451 tmpfs_setattr(void *v) 452 { 453 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 454 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 455 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 456 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 457 458 int error; 459 460 KASSERT(VOP_ISLOCKED(vp)); 461 462 error = 0; 463 464 /* Abort if any unsettable attribute is given. */ 465 if (vap->va_type != VNON || 466 vap->va_nlink != VNOVAL || 467 vap->va_fsid != VNOVAL || 468 vap->va_fileid != VNOVAL || 469 vap->va_blocksize != VNOVAL || 470 vap->va_ctime.tv_sec != VNOVAL || 471 vap->va_ctime.tv_nsec != VNOVAL || 472 vap->va_birthtime.tv_sec != VNOVAL || 473 vap->va_birthtime.tv_nsec != VNOVAL || 474 vap->va_gen != VNOVAL || 475 vap->va_rdev != VNOVAL || 476 vap->va_bytes != VNOVAL) 477 error = EINVAL; 478 479 if (error == 0 && (vap->va_flags != VNOVAL)) 480 error = tmpfs_chflags(vp, vap->va_flags, cred, l->l_proc); 481 482 if (error == 0 && (vap->va_size != VNOVAL)) 483 error = tmpfs_chsize(vp, vap->va_size, cred, l->l_proc); 484 485 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 486 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, 487 l->l_proc); 488 489 if (error == 0 && (vap->va_mode != VNOVAL)) 490 error = tmpfs_chmod(vp, vap->va_mode, cred, l->l_proc); 491 492 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 493 vap->va_atime.tv_nsec != VNOVAL) || 494 (vap->va_mtime.tv_sec != VNOVAL && 495 vap->va_mtime.tv_nsec != VNOVAL))) 496 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 497 vap->va_vaflags, cred, l); 498 499 /* Update the node times. We give preference to the error codes 500 * generated by this function rather than the ones that may arise 501 * from tmpfs_update. */ 502 tmpfs_update(vp, NULL, NULL, 0); 503 504 KASSERT(VOP_ISLOCKED(vp)); 505 506 return error; 507 } 508 509 /* --------------------------------------------------------------------- */ 510 511 int 512 tmpfs_read(void *v) 513 { 514 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 515 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 516 517 int error; 518 int flags; 519 struct tmpfs_node *node; 520 struct uvm_object *uobj; 521 522 KASSERT(VOP_ISLOCKED(vp)); 523 524 node = VP_TO_TMPFS_NODE(vp); 525 526 if (vp->v_type != VREG) { 527 error = EISDIR; 528 goto out; 529 } 530 531 if (uio->uio_offset < 0) { 532 error = EINVAL; 533 goto out; 534 } 535 536 node->tn_status |= TMPFS_NODE_ACCESSED; 537 538 uobj = node->tn_aobj; 539 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 540 error = 0; 541 while (error == 0 && uio->uio_resid > 0) { 542 vsize_t len; 543 void *win; 544 545 if (node->tn_size <= uio->uio_offset) 546 break; 547 548 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 549 if (len == 0) 550 break; 551 552 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 553 UBC_READ); 554 error = uiomove(win, len, uio); 555 ubc_release(win, flags); 556 } 557 558 out: 559 KASSERT(VOP_ISLOCKED(vp)); 560 561 return error; 562 } 563 564 /* --------------------------------------------------------------------- */ 565 566 int 567 tmpfs_write(void *v) 568 { 569 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 570 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 571 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 572 573 boolean_t extended; 574 int error; 575 int flags; 576 off_t oldsize; 577 struct tmpfs_node *node; 578 struct uvm_object *uobj; 579 580 KASSERT(VOP_ISLOCKED(vp)); 581 582 node = VP_TO_TMPFS_NODE(vp); 583 oldsize = node->tn_size; 584 585 if (uio->uio_offset < 0 || vp->v_type != VREG) { 586 error = EINVAL; 587 goto out; 588 } 589 590 if (uio->uio_resid == 0) { 591 error = 0; 592 goto out; 593 } 594 595 if (ioflag & IO_APPEND) 596 uio->uio_offset = node->tn_size; 597 598 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 599 if (extended) { 600 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 601 if (error != 0) 602 goto out; 603 } 604 605 uobj = node->tn_aobj; 606 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 607 error = 0; 608 while (error == 0 && uio->uio_resid > 0) { 609 vsize_t len; 610 void *win; 611 612 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 613 if (len == 0) 614 break; 615 616 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 617 UBC_WRITE); 618 error = uiomove(win, len, uio); 619 ubc_release(win, flags); 620 } 621 622 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 623 (extended ? TMPFS_NODE_CHANGED : 0); 624 625 if (error != 0) 626 (void)tmpfs_reg_resize(vp, oldsize); 627 628 out: 629 KASSERT(VOP_ISLOCKED(vp)); 630 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 631 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 632 633 return error; 634 } 635 636 /* --------------------------------------------------------------------- */ 637 638 int 639 tmpfs_fsync(void *v) 640 { 641 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 642 643 KASSERT(VOP_ISLOCKED(vp)); 644 645 tmpfs_update(vp, NULL, NULL, 0); 646 647 return 0; 648 } 649 650 /* --------------------------------------------------------------------- */ 651 652 int 653 tmpfs_remove(void *v) 654 { 655 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 656 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 657 658 int error; 659 struct tmpfs_dirent *de; 660 struct tmpfs_mount *tmp; 661 struct tmpfs_node *dnode; 662 struct tmpfs_node *node; 663 664 KASSERT(VOP_ISLOCKED(dvp)); 665 KASSERT(VOP_ISLOCKED(vp)); 666 667 dnode = VP_TO_TMPFS_DIR(dvp); 668 node = VP_TO_TMPFS_NODE(vp); 669 tmp = VFS_TO_TMPFS(vp->v_mount); 670 de = node->tn_lookup_dirent; 671 KASSERT(de != NULL); 672 673 /* XXX: Why isn't this done by the caller? */ 674 if (vp->v_type == VDIR) { 675 error = EISDIR; 676 goto out; 677 } 678 679 /* Files marked as immutable or append-only cannot be deleted. */ 680 if (node->tn_flags & (IMMUTABLE | APPEND)) { 681 error = EPERM; 682 goto out; 683 } 684 685 /* Remove the entry from the directory; as it is a file, we do not 686 * have to change the number of hard links of the directory. */ 687 tmpfs_dir_detach(dvp, de); 688 689 /* Notify interested parties about the modification of dvp. 690 * The removal of vp is notified when it is reclaimed. */ 691 VN_KNOTE(dvp, NOTE_WRITE); 692 693 /* Free the directory entry we just deleted. Note that the node 694 * referred by it will not be removed until the vnode is really 695 * reclaimed. */ 696 tmpfs_free_dirent(tmp, de, TRUE); 697 698 error = 0; 699 700 out: 701 vput(dvp); 702 vput(vp); 703 704 KASSERT(!VOP_ISLOCKED(dvp)); 705 706 return error; 707 } 708 709 /* --------------------------------------------------------------------- */ 710 711 int 712 tmpfs_link(void *v) 713 { 714 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 715 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 716 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 717 718 int error; 719 struct tmpfs_dirent *de; 720 struct tmpfs_node *dnode; 721 struct tmpfs_node *node; 722 723 KASSERT(VOP_ISLOCKED(dvp)); 724 KASSERT(!VOP_ISLOCKED(vp)); 725 KASSERT(cnp->cn_flags & HASBUF); 726 KASSERT(dvp != vp); /* XXX When can this be false? */ 727 728 dnode = VP_TO_TMPFS_DIR(dvp); 729 node = VP_TO_TMPFS_NODE(vp); 730 731 /* Lock vp because we will need to run tmpfs_update over it, which 732 * needs the vnode to be locked. */ 733 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 734 if (error != 0) 735 goto out; 736 737 /* XXX: Why aren't the following two tests done by the caller? */ 738 739 /* Hard links of directories are forbidden. */ 740 if (vp->v_type == VDIR) { 741 error = EPERM; 742 goto out; 743 } 744 745 /* Cannot create cross-device links. */ 746 if (dvp->v_mount != vp->v_mount) { 747 error = EXDEV; 748 goto out; 749 } 750 751 /* Ensure that we do not overflow the maximum number of links imposed 752 * by the system. */ 753 KASSERT(node->tn_links <= LINK_MAX); 754 if (node->tn_links == LINK_MAX) { 755 error = EMLINK; 756 goto out; 757 } 758 759 /* We cannot create links of files marked immutable or append-only. */ 760 if (node->tn_flags & (IMMUTABLE | APPEND)) { 761 error = EPERM; 762 goto out; 763 } 764 765 /* Allocate a new directory entry to represent the node. */ 766 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 767 cnp->cn_nameptr, cnp->cn_namelen, &de); 768 if (error != 0) 769 goto out; 770 771 /* Insert the new directory entry into the appropriate directory. */ 772 tmpfs_dir_attach(dvp, de); 773 VN_KNOTE(dvp, NOTE_WRITE); 774 775 /* vp link count has changed, so update node times. */ 776 node->tn_status |= TMPFS_NODE_CHANGED; 777 tmpfs_update(vp, NULL, NULL, 0); 778 779 error = 0; 780 781 out: 782 if (VOP_ISLOCKED(vp)) 783 VOP_UNLOCK(vp, 0); 784 785 PNBUF_PUT(cnp->cn_pnbuf); 786 787 vput(dvp); 788 789 /* XXX Locking status of dvp does not match manual page. */ 790 KASSERT(!VOP_ISLOCKED(dvp)); 791 KASSERT(!VOP_ISLOCKED(vp)); 792 793 return error; 794 } 795 796 /* --------------------------------------------------------------------- */ 797 798 int 799 tmpfs_rename(void *v) 800 { 801 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 802 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 803 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 804 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 805 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 806 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 807 808 char *newname; 809 int error; 810 struct tmpfs_dirent *de; 811 struct tmpfs_mount *tmp; 812 struct tmpfs_node *fdnode; 813 struct tmpfs_node *fnode; 814 struct tmpfs_node *tdnode; 815 816 KASSERT(VOP_ISLOCKED(tdvp)); 817 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 818 KASSERT(fcnp->cn_flags & HASBUF); 819 KASSERT(tcnp->cn_flags & HASBUF); 820 821 fdnode = VP_TO_TMPFS_DIR(fdvp); 822 fnode = VP_TO_TMPFS_NODE(fvp); 823 de = fnode->tn_lookup_dirent; 824 825 /* Disallow cross-device renames. 826 * XXX Why isn't this done by the caller? */ 827 if (fvp->v_mount != tdvp->v_mount || 828 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 829 error = EXDEV; 830 goto out; 831 } 832 833 tmp = VFS_TO_TMPFS(tdvp->v_mount); 834 tdnode = VP_TO_TMPFS_DIR(tdvp); 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 we need to move the directory between entries, lock the 851 * source so that we can safely operate on it. */ 852 if (fdnode != tdnode) { 853 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 854 if (error != 0) 855 goto out; 856 } 857 858 /* Ensure that we have enough memory to hold the new name, if it 859 * has to be changed. */ 860 if (fcnp->cn_namelen != tcnp->cn_namelen || 861 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 862 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 863 tcnp->cn_namelen, 0); 864 if (newname == NULL) { 865 error = ENOSPC; 866 goto out_locked; 867 } 868 } else 869 newname = NULL; 870 871 /* If the node is being moved to another directory, we have to do 872 * the move. */ 873 if (fdnode != tdnode) { 874 /* In case we are moving a directory, we have to adjust its 875 * parent to point to the new parent. */ 876 if (de->td_node->tn_type == VDIR) { 877 struct tmpfs_node *n; 878 879 /* Ensure the target directory is not a child of the 880 * directory being moved. Otherwise, we'd end up 881 * with stale nodes. */ 882 n = tdnode; 883 while (n != n->tn_parent) { 884 if (n == fnode) { 885 error = EINVAL; 886 goto out_locked; 887 } 888 n = n->tn_parent; 889 } 890 891 /* Adjust the parent pointer. */ 892 TMPFS_VALIDATE_DIR(fnode); 893 de->td_node->tn_parent = tdnode; 894 895 /* As a result of changing the target of the '..' 896 * entry, the link count of the source and target 897 * directories has to be adjusted. */ 898 fdnode->tn_links--; 899 tdnode->tn_links++; 900 } 901 902 /* Do the move: just remove the entry from the source directory 903 * and insert it into the target one. */ 904 tmpfs_dir_detach(fdvp, de); 905 tmpfs_dir_attach(tdvp, de); 906 907 /* Notify listeners of fdvp about the change in the directory. 908 * We can do it at this point because we aren't touching fdvp 909 * any more below. */ 910 VN_KNOTE(fdvp, NOTE_WRITE); 911 } 912 913 /* If the name has changed, we need to make it effective by changing 914 * it in the directory entry. */ 915 if (newname != NULL) { 916 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 917 KASSERT(tcnp->cn_namelen < 0xffff); 918 919 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 920 de->td_namelen); 921 de->td_namelen = (uint16_t)tcnp->cn_namelen; 922 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 923 de->td_name = newname; 924 925 fnode->tn_status |= TMPFS_NODE_MODIFIED; 926 } 927 928 /* If we are overwriting an entry, we have to remove the old one 929 * from the target directory. */ 930 if (tvp != NULL) { 931 struct tmpfs_node *tnode; 932 933 tnode = VP_TO_TMPFS_NODE(tvp); 934 935 /* The source node cannot be a directory in this case. */ 936 KASSERT(fnode->tn_type != VDIR); 937 938 /* Remove the old entry from the target directory. */ 939 de = tnode->tn_lookup_dirent; 940 tmpfs_dir_detach(tdvp, de); 941 942 /* Free the directory entry we just deleted. Note that the 943 * node referred by it will not be removed until the vnode is 944 * really reclaimed. */ 945 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 946 } 947 948 /* Notify listeners of tdvp about the change in the directory (either 949 * because a new entry was added or because one was removed). */ 950 VN_KNOTE(tdvp, NOTE_WRITE); 951 952 error = 0; 953 954 out_locked: 955 if (fdnode != tdnode) 956 VOP_UNLOCK(fdvp, 0); 957 958 out: 959 /* Release target nodes. */ 960 /* XXX: I don't understand when tdvp can be the same as tvp, but 961 * other code takes care of this... */ 962 if (tdvp == tvp) 963 vrele(tdvp); 964 else 965 vput(tdvp); 966 if (tvp != NULL) 967 vput(tvp); 968 969 /* Release source nodes. */ 970 vrele(fdvp); 971 vrele(fvp); 972 973 return error; 974 } 975 976 /* --------------------------------------------------------------------- */ 977 978 int 979 tmpfs_mkdir(void *v) 980 { 981 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 982 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 983 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 984 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 985 986 KASSERT(vap->va_type == VDIR); 987 988 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 989 } 990 991 /* --------------------------------------------------------------------- */ 992 993 int 994 tmpfs_rmdir(void *v) 995 { 996 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 997 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 998 999 int error; 1000 struct tmpfs_dirent *de; 1001 struct tmpfs_mount *tmp; 1002 struct tmpfs_node *dnode; 1003 struct tmpfs_node *node; 1004 1005 KASSERT(VOP_ISLOCKED(dvp)); 1006 KASSERT(VOP_ISLOCKED(vp)); 1007 1008 tmp = VFS_TO_TMPFS(dvp->v_mount); 1009 dnode = VP_TO_TMPFS_DIR(dvp); 1010 node = VP_TO_TMPFS_DIR(vp); 1011 KASSERT(node->tn_parent == dnode); 1012 1013 /* Get the directory entry associated with node (vp). This was 1014 * filled by tmpfs_lookup while looking up the entry. */ 1015 de = node->tn_lookup_dirent; 1016 KASSERT(TMPFS_DIRENT_MATCHES(de, 1017 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1018 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1019 1020 /* Directories with more than two entries ('.' and '..') cannot be 1021 * removed. */ 1022 if (node->tn_size > 0) { 1023 error = ENOTEMPTY; 1024 goto out; 1025 } 1026 1027 /* Check flags to see if we are allowed to remove the directory. */ 1028 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1029 error = EPERM; 1030 goto out; 1031 } 1032 1033 /* Detach the directory entry from the directory (dnode). */ 1034 tmpfs_dir_detach(dvp, de); 1035 1036 node->tn_links--; 1037 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1038 TMPFS_NODE_MODIFIED; 1039 node->tn_parent->tn_links--; 1040 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1041 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1042 1043 /* Notify modification of parent directory and release it. */ 1044 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1045 cache_purge(dvp); /* XXX Is this needed? */ 1046 vput(dvp); 1047 1048 /* Free the directory entry we just deleted. Note that the node 1049 * referred by it will not be removed until the vnode is really 1050 * reclaimed. */ 1051 tmpfs_free_dirent(tmp, de, TRUE); 1052 1053 /* Release the deleted vnode (will destroy the node, notify 1054 * interested parties and clean it from the cache). */ 1055 vput(vp); 1056 1057 error = 0; 1058 1059 out: 1060 if (error != 0) { 1061 vput(dvp); 1062 vput(vp); 1063 } 1064 1065 return error; 1066 } 1067 1068 /* --------------------------------------------------------------------- */ 1069 1070 int 1071 tmpfs_symlink(void *v) 1072 { 1073 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1074 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1075 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1076 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1077 char *target = ((struct vop_symlink_args *)v)->a_target; 1078 1079 KASSERT(vap->va_type == VLNK); 1080 1081 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1082 } 1083 1084 /* --------------------------------------------------------------------- */ 1085 1086 int 1087 tmpfs_readdir(void *v) 1088 { 1089 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1090 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1091 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1092 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1093 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1094 1095 int error; 1096 off_t startoff; 1097 off_t cnt; 1098 struct tmpfs_node *node; 1099 1100 KASSERT(VOP_ISLOCKED(vp)); 1101 1102 /* This operation only makes sense on directory nodes. */ 1103 if (vp->v_type != VDIR) { 1104 error = ENOTDIR; 1105 goto out; 1106 } 1107 1108 node = VP_TO_TMPFS_DIR(vp); 1109 1110 startoff = uio->uio_offset; 1111 1112 cnt = 0; 1113 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1114 error = tmpfs_dir_getdotdent(node, uio); 1115 if (error == -1) { 1116 error = 0; 1117 goto outok; 1118 } else if (error != 0) 1119 goto outok; 1120 cnt++; 1121 } 1122 1123 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1124 error = tmpfs_dir_getdotdotdent(node, uio); 1125 if (error == -1) { 1126 error = 0; 1127 goto outok; 1128 } else if (error != 0) 1129 goto outok; 1130 cnt++; 1131 } 1132 1133 error = tmpfs_dir_getdents(node, uio, &cnt); 1134 if (error == -1) 1135 error = 0; 1136 KASSERT(error >= 0); 1137 1138 outok: 1139 /* This label assumes that startoff has been 1140 * initialized. If the compiler didn't spit out warnings, we'd 1141 * simply make this one be 'out' and drop 'outok'. */ 1142 1143 if (eofflag != NULL) 1144 *eofflag = 1145 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1146 1147 /* Update NFS-related variables. */ 1148 if (error == 0 && cookies != NULL && ncookies != NULL) { 1149 off_t i; 1150 off_t off = startoff; 1151 struct tmpfs_dirent *de = NULL; 1152 1153 *ncookies = cnt; 1154 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1155 1156 for (i = 0; i < cnt; i++) { 1157 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1158 if (off == TMPFS_DIRCOOKIE_DOT) { 1159 off = TMPFS_DIRCOOKIE_DOTDOT; 1160 } else { 1161 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1162 de = TAILQ_FIRST(&node->tn_dir); 1163 } else if (de != NULL) { 1164 de = TAILQ_NEXT(de, td_entries); 1165 } else { 1166 de = tmpfs_dir_lookupbycookie(node, 1167 off); 1168 KASSERT(de != NULL); 1169 de = TAILQ_NEXT(de, td_entries); 1170 } 1171 if (de == NULL) { 1172 off = TMPFS_DIRCOOKIE_EOF; 1173 } else { 1174 off = TMPFS_DIRCOOKIE(de); 1175 } 1176 } 1177 1178 (*cookies)[i] = off; 1179 } 1180 KASSERT(uio->uio_offset == off); 1181 } 1182 1183 out: 1184 KASSERT(VOP_ISLOCKED(vp)); 1185 1186 return error; 1187 } 1188 1189 /* --------------------------------------------------------------------- */ 1190 1191 int 1192 tmpfs_readlink(void *v) 1193 { 1194 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1195 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1196 1197 int error; 1198 struct tmpfs_node *node; 1199 1200 KASSERT(VOP_ISLOCKED(vp)); 1201 KASSERT(uio->uio_offset == 0); 1202 KASSERT(vp->v_type == VLNK); 1203 1204 node = VP_TO_TMPFS_NODE(vp); 1205 1206 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1207 uio); 1208 node->tn_status |= TMPFS_NODE_ACCESSED; 1209 1210 KASSERT(VOP_ISLOCKED(vp)); 1211 1212 return error; 1213 } 1214 1215 /* --------------------------------------------------------------------- */ 1216 1217 int 1218 tmpfs_inactive(void *v) 1219 { 1220 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1221 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1222 1223 struct tmpfs_node *node; 1224 1225 KASSERT(VOP_ISLOCKED(vp)); 1226 1227 node = VP_TO_TMPFS_NODE(vp); 1228 1229 VOP_UNLOCK(vp, 0); 1230 1231 if (node->tn_links == 0) 1232 vrecycle(vp, NULL, l); 1233 1234 return 0; 1235 } 1236 1237 /* --------------------------------------------------------------------- */ 1238 1239 int 1240 tmpfs_reclaim(void *v) 1241 { 1242 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1243 1244 struct tmpfs_mount *tmp; 1245 struct tmpfs_node *node; 1246 1247 KASSERT(!VOP_ISLOCKED(vp)); 1248 1249 node = VP_TO_TMPFS_NODE(vp); 1250 tmp = VFS_TO_TMPFS(vp->v_mount); 1251 1252 if (node->tn_links == 0) 1253 VN_KNOTE(vp, NOTE_DELETE); 1254 1255 cache_purge(vp); 1256 tmpfs_free_vp(vp); 1257 1258 /* If the node referenced by this vnode was deleted by the user, 1259 * we must free its associated data structures (now that the vnode 1260 * is being reclaimed). */ 1261 if (node->tn_links == 0) 1262 tmpfs_free_node(tmp, node); 1263 1264 KASSERT(!VOP_ISLOCKED(vp)); 1265 KASSERT(vp->v_data == NULL); 1266 1267 return 0; 1268 } 1269 1270 /* --------------------------------------------------------------------- */ 1271 1272 int 1273 tmpfs_print(void *v) 1274 { 1275 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1276 1277 struct tmpfs_node *node; 1278 1279 node = VP_TO_TMPFS_NODE(vp); 1280 1281 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1282 node, node->tn_flags, node->tn_links); 1283 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1284 ", status 0x%x\n", 1285 node->tn_mode, node->tn_uid, node->tn_gid, 1286 (uintmax_t)node->tn_size, node->tn_status); 1287 1288 if (vp->v_type == VFIFO) 1289 fifo_printinfo(vp); 1290 lockmgr_printinfo(&vp->v_lock); 1291 1292 printf("\n"); 1293 1294 return 0; 1295 } 1296 1297 /* --------------------------------------------------------------------- */ 1298 1299 int 1300 tmpfs_pathconf(void *v) 1301 { 1302 int name = ((struct vop_pathconf_args *)v)->a_name; 1303 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1304 1305 int error; 1306 1307 error = 0; 1308 1309 switch (name) { 1310 case _PC_LINK_MAX: 1311 *retval = LINK_MAX; 1312 break; 1313 1314 case _PC_NAME_MAX: 1315 *retval = NAME_MAX; 1316 break; 1317 1318 case _PC_PATH_MAX: 1319 *retval = PATH_MAX; 1320 break; 1321 1322 case _PC_PIPE_BUF: 1323 *retval = PIPE_BUF; 1324 break; 1325 1326 case _PC_CHOWN_RESTRICTED: 1327 *retval = 1; 1328 break; 1329 1330 case _PC_NO_TRUNC: 1331 *retval = 1; 1332 break; 1333 1334 case _PC_SYNC_IO: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_FILESIZEBITS: 1339 *retval = 0; /* XXX Don't know which value should I return. */ 1340 break; 1341 1342 default: 1343 error = EINVAL; 1344 } 1345 1346 return error; 1347 } 1348 1349 /* --------------------------------------------------------------------- */ 1350 1351 int 1352 tmpfs_advlock(void *v) 1353 { 1354 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1355 1356 struct tmpfs_node *node; 1357 1358 node = VP_TO_TMPFS_NODE(vp); 1359 1360 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1361 } 1362 1363 /* --------------------------------------------------------------------- */ 1364 1365 int 1366 tmpfs_getpages(void *v) 1367 { 1368 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1369 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1370 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1371 int *count = ((struct vop_getpages_args *)v)->a_count; 1372 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1373 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1374 int advice = ((struct vop_getpages_args *)v)->a_advice; 1375 int flags = ((struct vop_getpages_args *)v)->a_flags; 1376 1377 int error; 1378 struct tmpfs_node *node; 1379 struct uvm_object *uobj; 1380 int npages = *count; 1381 1382 KASSERT(vp->v_type == VREG); 1383 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1384 1385 node = VP_TO_TMPFS_NODE(vp); 1386 uobj = node->tn_aobj; 1387 1388 /* We currently don't rely on PGO_PASTEOF. */ 1389 1390 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1391 if ((flags & PGO_LOCKED) == 0) 1392 simple_unlock(&vp->v_interlock); 1393 return EINVAL; 1394 } 1395 1396 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1397 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1398 } 1399 1400 if ((flags & PGO_LOCKED) != 0) 1401 return EBUSY; 1402 1403 if ((flags & PGO_NOTIMESTAMP) == 0) { 1404 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1405 node->tn_status |= TMPFS_NODE_ACCESSED; 1406 1407 if ((access_type & VM_PROT_WRITE) != 0) 1408 node->tn_status |= TMPFS_NODE_MODIFIED; 1409 } 1410 1411 simple_unlock(&vp->v_interlock); 1412 1413 simple_lock(&uobj->vmobjlock); 1414 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1415 access_type, advice, flags); 1416 1417 return error; 1418 } 1419 1420 /* --------------------------------------------------------------------- */ 1421 1422 int 1423 tmpfs_putpages(void *v) 1424 { 1425 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1426 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1427 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1428 int flags = ((struct vop_putpages_args *)v)->a_flags; 1429 1430 int error; 1431 struct tmpfs_node *node; 1432 struct uvm_object *uobj; 1433 1434 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1435 1436 node = VP_TO_TMPFS_NODE(vp); 1437 1438 if (vp->v_type != VREG) { 1439 simple_unlock(&vp->v_interlock); 1440 return 0; 1441 } 1442 1443 uobj = node->tn_aobj; 1444 simple_unlock(&vp->v_interlock); 1445 1446 simple_lock(&uobj->vmobjlock); 1447 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1448 1449 /* XXX mtime */ 1450 1451 return error; 1452 } 1453