1 /* $NetBSD: tmpfs_vnops.c,v 1.44 2007/11/26 19:01:55 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006 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 1.44 2007/11/26 19:01:55 pooka 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 #include <sys/kauth.h> 60 61 #include <uvm/uvm.h> 62 63 #include <miscfs/fifofs/fifo.h> 64 #include <fs/tmpfs/tmpfs_vnops.h> 65 #include <fs/tmpfs/tmpfs.h> 66 67 /* --------------------------------------------------------------------- */ 68 69 /* 70 * vnode operations vector used for files stored in a tmpfs file system. 71 */ 72 int (**tmpfs_vnodeop_p)(void *); 73 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 74 { &vop_default_desc, vn_default_error }, 75 { &vop_lookup_desc, tmpfs_lookup }, 76 { &vop_create_desc, tmpfs_create }, 77 { &vop_mknod_desc, tmpfs_mknod }, 78 { &vop_open_desc, tmpfs_open }, 79 { &vop_close_desc, tmpfs_close }, 80 { &vop_access_desc, tmpfs_access }, 81 { &vop_getattr_desc, tmpfs_getattr }, 82 { &vop_setattr_desc, tmpfs_setattr }, 83 { &vop_read_desc, tmpfs_read }, 84 { &vop_write_desc, tmpfs_write }, 85 { &vop_ioctl_desc, tmpfs_ioctl }, 86 { &vop_fcntl_desc, tmpfs_fcntl }, 87 { &vop_poll_desc, tmpfs_poll }, 88 { &vop_kqfilter_desc, tmpfs_kqfilter }, 89 { &vop_revoke_desc, tmpfs_revoke }, 90 { &vop_mmap_desc, tmpfs_mmap }, 91 { &vop_fsync_desc, tmpfs_fsync }, 92 { &vop_seek_desc, tmpfs_seek }, 93 { &vop_remove_desc, tmpfs_remove }, 94 { &vop_link_desc, tmpfs_link }, 95 { &vop_rename_desc, tmpfs_rename }, 96 { &vop_mkdir_desc, tmpfs_mkdir }, 97 { &vop_rmdir_desc, tmpfs_rmdir }, 98 { &vop_symlink_desc, tmpfs_symlink }, 99 { &vop_readdir_desc, tmpfs_readdir }, 100 { &vop_readlink_desc, tmpfs_readlink }, 101 { &vop_abortop_desc, tmpfs_abortop }, 102 { &vop_inactive_desc, tmpfs_inactive }, 103 { &vop_reclaim_desc, tmpfs_reclaim }, 104 { &vop_lock_desc, tmpfs_lock }, 105 { &vop_unlock_desc, tmpfs_unlock }, 106 { &vop_bmap_desc, tmpfs_bmap }, 107 { &vop_strategy_desc, tmpfs_strategy }, 108 { &vop_print_desc, tmpfs_print }, 109 { &vop_pathconf_desc, tmpfs_pathconf }, 110 { &vop_islocked_desc, tmpfs_islocked }, 111 { &vop_advlock_desc, tmpfs_advlock }, 112 { &vop_lease_desc, tmpfs_lease }, 113 { &vop_bwrite_desc, tmpfs_bwrite }, 114 { &vop_getpages_desc, tmpfs_getpages }, 115 { &vop_putpages_desc, tmpfs_putpages }, 116 { NULL, NULL } 117 }; 118 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 119 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 120 121 /* --------------------------------------------------------------------- */ 122 123 int 124 tmpfs_lookup(void *v) 125 { 126 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 127 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 128 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 129 130 int error; 131 struct tmpfs_dirent *de; 132 struct tmpfs_node *dnode; 133 134 KASSERT(VOP_ISLOCKED(dvp)); 135 136 dnode = VP_TO_TMPFS_DIR(dvp); 137 *vpp = NULL; 138 139 /* Check accessibility of requested node as a first step. */ 140 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 141 if (error != 0) 142 goto out; 143 144 /* If requesting the last path component on a read-only file system 145 * with a write operation, deny it. */ 146 if ((cnp->cn_flags & ISLASTCN) && 147 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 148 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 149 error = EROFS; 150 goto out; 151 } 152 153 /* Avoid doing a linear scan of the directory if the requested 154 * directory/name couple is already in the cache. */ 155 error = cache_lookup(dvp, vpp, cnp); 156 if (error >= 0) 157 goto out; 158 159 /* We cannot be requesting the parent directory of the root node. */ 160 KASSERT(IMPLIES(dnode->tn_type == VDIR && 161 dnode->tn_spec.tn_dir.tn_parent == dnode, 162 !(cnp->cn_flags & ISDOTDOT))); 163 164 if (cnp->cn_flags & ISDOTDOT) { 165 VOP_UNLOCK(dvp, 0); 166 167 /* Allocate a new vnode on the matching entry. */ 168 error = tmpfs_alloc_vp(dvp->v_mount, 169 dnode->tn_spec.tn_dir.tn_parent, vpp); 170 171 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 172 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 173 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 174 VREF(dvp); 175 *vpp = dvp; 176 dnode->tn_lookup_dirent = NULL; 177 error = 0; 178 } else { 179 de = tmpfs_dir_lookup(dnode, cnp); 180 if (de == NULL) { 181 /* The entry was not found in the directory. 182 * This is OK iff we are creating or renaming an 183 * entry and are working on the last component of 184 * the path name. */ 185 if ((cnp->cn_flags & ISLASTCN) && 186 (cnp->cn_nameiop == CREATE || \ 187 cnp->cn_nameiop == RENAME)) { 188 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 189 if (error != 0) 190 goto out; 191 192 /* Keep the component name in the buffer for 193 * future uses. */ 194 cnp->cn_flags |= SAVENAME; 195 196 error = EJUSTRETURN; 197 } else 198 error = ENOENT; 199 } else { 200 struct tmpfs_node *tnode; 201 202 /* The entry was found, so get its associated 203 * tmpfs_node. */ 204 tnode = de->td_node; 205 206 /* If we are not at the last path component and 207 * found a non-directory or non-link entry (which 208 * may itself be pointing to a directory), raise 209 * an error. */ 210 if ((tnode->tn_type != VDIR && 211 tnode->tn_type != VLNK) && 212 !(cnp->cn_flags & ISLASTCN)) { 213 error = ENOTDIR; 214 goto out; 215 } 216 217 /* If we are deleting or renaming the entry, keep 218 * track of its tmpfs_dirent so that it can be 219 * easily deleted later. */ 220 if ((cnp->cn_flags & ISLASTCN) && 221 (cnp->cn_nameiop == DELETE || 222 cnp->cn_nameiop == RENAME)) { 223 if ((dnode->tn_mode & S_ISTXT) != 0 && 224 kauth_authorize_generic(cnp->cn_cred, 225 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 226 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 227 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 228 return EPERM; 229 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 230 if (error != 0) 231 goto out; 232 tnode->tn_lookup_dirent = de; 233 } 234 235 /* Allocate a new vnode on the matching entry. */ 236 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 237 } 238 } 239 240 /* Store the result of this lookup in the cache. Avoid this if the 241 * request was for creation, as it does not improve timings on 242 * emprical tests. */ 243 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 244 cache_enter(dvp, *vpp, cnp); 245 246 out: 247 /* If there were no errors, *vpp cannot be null and it must be 248 * locked. */ 249 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 250 251 /* dvp must always be locked. */ 252 KASSERT(VOP_ISLOCKED(dvp)); 253 254 return error; 255 } 256 257 /* --------------------------------------------------------------------- */ 258 259 int 260 tmpfs_create(void *v) 261 { 262 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 263 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 264 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 265 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 266 267 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 268 269 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 270 } 271 /* --------------------------------------------------------------------- */ 272 273 int 274 tmpfs_mknod(void *v) 275 { 276 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 277 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 278 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 279 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 280 281 if (vap->va_type != VBLK && vap->va_type != VCHR && 282 vap->va_type != VFIFO) 283 return EINVAL; 284 285 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 286 } 287 288 /* --------------------------------------------------------------------- */ 289 290 int 291 tmpfs_open(void *v) 292 { 293 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 294 int mode = ((struct vop_open_args *)v)->a_mode; 295 296 int error; 297 struct tmpfs_node *node; 298 299 KASSERT(VOP_ISLOCKED(vp)); 300 301 node = VP_TO_TMPFS_NODE(vp); 302 303 /* The file is still active but all its names have been removed 304 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 305 * it is about to die. */ 306 if (node->tn_links < 1) { 307 error = ENOENT; 308 goto out; 309 } 310 311 /* If the file is marked append-only, deny write requests. */ 312 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 313 error = EPERM; 314 else 315 error = 0; 316 317 out: 318 KASSERT(VOP_ISLOCKED(vp)); 319 320 return error; 321 } 322 323 /* --------------------------------------------------------------------- */ 324 325 int 326 tmpfs_close(void *v) 327 { 328 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 329 330 struct tmpfs_node *node; 331 332 KASSERT(VOP_ISLOCKED(vp)); 333 334 node = VP_TO_TMPFS_NODE(vp); 335 336 if (node->tn_links > 0) { 337 /* Update node times. No need to do it if the node has 338 * been deleted, because it will vanish after we return. */ 339 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 340 } 341 342 return 0; 343 } 344 345 /* --------------------------------------------------------------------- */ 346 347 int 348 tmpfs_access(void *v) 349 { 350 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 351 int mode = ((struct vop_access_args *)v)->a_mode; 352 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 353 354 int error; 355 struct tmpfs_node *node; 356 357 KASSERT(VOP_ISLOCKED(vp)); 358 359 node = VP_TO_TMPFS_NODE(vp); 360 361 switch (vp->v_type) { 362 case VDIR: 363 /* FALLTHROUGH */ 364 case VLNK: 365 /* FALLTHROUGH */ 366 case VREG: 367 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 368 error = EROFS; 369 goto out; 370 } 371 break; 372 373 case VBLK: 374 /* FALLTHROUGH */ 375 case VCHR: 376 /* FALLTHROUGH */ 377 case VSOCK: 378 /* FALLTHROUGH */ 379 case VFIFO: 380 break; 381 382 default: 383 error = EINVAL; 384 goto out; 385 } 386 387 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 388 error = EPERM; 389 goto out; 390 } 391 392 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 393 node->tn_gid, mode, cred); 394 395 out: 396 KASSERT(VOP_ISLOCKED(vp)); 397 398 return error; 399 } 400 401 /* --------------------------------------------------------------------- */ 402 403 int 404 tmpfs_getattr(void *v) 405 { 406 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 407 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 408 409 struct tmpfs_node *node; 410 411 node = VP_TO_TMPFS_NODE(vp); 412 413 VATTR_NULL(vap); 414 415 tmpfs_itimes(vp, NULL, NULL); 416 417 vap->va_type = vp->v_type; 418 vap->va_mode = node->tn_mode; 419 vap->va_nlink = node->tn_links; 420 vap->va_uid = node->tn_uid; 421 vap->va_gid = node->tn_gid; 422 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 423 vap->va_fileid = node->tn_id; 424 vap->va_size = node->tn_size; 425 vap->va_blocksize = PAGE_SIZE; 426 vap->va_atime = node->tn_atime; 427 vap->va_mtime = node->tn_mtime; 428 vap->va_ctime = node->tn_ctime; 429 vap->va_birthtime = node->tn_birthtime; 430 vap->va_gen = node->tn_gen; 431 vap->va_flags = node->tn_flags; 432 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 433 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 434 vap->va_bytes = round_page(node->tn_size); 435 vap->va_filerev = VNOVAL; 436 vap->va_vaflags = 0; 437 vap->va_spare = VNOVAL; /* XXX */ 438 439 return 0; 440 } 441 442 /* --------------------------------------------------------------------- */ 443 444 /* XXX Should this operation be atomic? I think it should, but code in 445 * XXX other places (e.g., ufs) doesn't seem to be... */ 446 int 447 tmpfs_setattr(void *v) 448 { 449 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 450 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 451 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 452 struct lwp *l = curlwp; 453 454 int error; 455 456 KASSERT(VOP_ISLOCKED(vp)); 457 458 error = 0; 459 460 /* Abort if any unsettable attribute is given. */ 461 if (vap->va_type != VNON || 462 vap->va_nlink != VNOVAL || 463 vap->va_fsid != VNOVAL || 464 vap->va_fileid != VNOVAL || 465 vap->va_blocksize != VNOVAL || 466 vap->va_ctime.tv_sec != VNOVAL || 467 vap->va_ctime.tv_nsec != VNOVAL || 468 vap->va_birthtime.tv_sec != VNOVAL || 469 vap->va_birthtime.tv_nsec != VNOVAL || 470 vap->va_gen != VNOVAL || 471 vap->va_rdev != VNOVAL || 472 vap->va_bytes != VNOVAL) 473 error = EINVAL; 474 475 if (error == 0 && (vap->va_flags != VNOVAL)) 476 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 477 478 if (error == 0 && (vap->va_size != VNOVAL)) 479 error = tmpfs_chsize(vp, vap->va_size, cred, l); 480 481 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 482 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 483 484 if (error == 0 && (vap->va_mode != VNOVAL)) 485 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 486 487 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 488 vap->va_atime.tv_nsec != VNOVAL) || 489 (vap->va_mtime.tv_sec != VNOVAL && 490 vap->va_mtime.tv_nsec != VNOVAL))) 491 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 492 vap->va_vaflags, cred, l); 493 494 /* Update the node times. We give preference to the error codes 495 * generated by this function rather than the ones that may arise 496 * from tmpfs_update. */ 497 tmpfs_update(vp, NULL, NULL, 0); 498 499 KASSERT(VOP_ISLOCKED(vp)); 500 501 return error; 502 } 503 504 /* --------------------------------------------------------------------- */ 505 506 int 507 tmpfs_read(void *v) 508 { 509 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 510 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 511 512 int error; 513 int flags; 514 struct tmpfs_node *node; 515 struct uvm_object *uobj; 516 517 KASSERT(VOP_ISLOCKED(vp)); 518 519 node = VP_TO_TMPFS_NODE(vp); 520 521 if (vp->v_type != VREG) { 522 error = EISDIR; 523 goto out; 524 } 525 526 if (uio->uio_offset < 0) { 527 error = EINVAL; 528 goto out; 529 } 530 531 node->tn_status |= TMPFS_NODE_ACCESSED; 532 533 uobj = node->tn_spec.tn_reg.tn_aobj; 534 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 535 error = 0; 536 while (error == 0 && uio->uio_resid > 0) { 537 vsize_t len; 538 void *win; 539 540 if (node->tn_size <= uio->uio_offset) 541 break; 542 543 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 544 if (len == 0) 545 break; 546 547 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 548 UBC_READ); 549 error = uiomove(win, len, uio); 550 ubc_release(win, flags); 551 } 552 553 out: 554 KASSERT(VOP_ISLOCKED(vp)); 555 556 return error; 557 } 558 559 /* --------------------------------------------------------------------- */ 560 561 int 562 tmpfs_write(void *v) 563 { 564 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 565 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 566 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 567 568 bool extended; 569 int error; 570 int flags; 571 off_t oldsize; 572 struct tmpfs_node *node; 573 struct uvm_object *uobj; 574 575 KASSERT(VOP_ISLOCKED(vp)); 576 577 node = VP_TO_TMPFS_NODE(vp); 578 oldsize = node->tn_size; 579 580 if (uio->uio_offset < 0 || vp->v_type != VREG) { 581 error = EINVAL; 582 goto out; 583 } 584 585 if (uio->uio_resid == 0) { 586 error = 0; 587 goto out; 588 } 589 590 if (ioflag & IO_APPEND) 591 uio->uio_offset = node->tn_size; 592 593 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 594 if (extended) { 595 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 596 if (error != 0) 597 goto out; 598 } 599 600 uobj = node->tn_spec.tn_reg.tn_aobj; 601 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 602 error = 0; 603 while (error == 0 && uio->uio_resid > 0) { 604 vsize_t len; 605 void *win; 606 607 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 608 if (len == 0) 609 break; 610 611 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 612 UBC_WRITE); 613 error = uiomove(win, len, uio); 614 ubc_release(win, flags); 615 } 616 617 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 618 (extended ? TMPFS_NODE_CHANGED : 0); 619 620 if (error != 0) 621 (void)tmpfs_reg_resize(vp, oldsize); 622 623 VN_KNOTE(vp, NOTE_WRITE); 624 625 out: 626 KASSERT(VOP_ISLOCKED(vp)); 627 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 628 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 629 630 return error; 631 } 632 633 /* --------------------------------------------------------------------- */ 634 635 int 636 tmpfs_fsync(void *v) 637 { 638 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 639 640 KASSERT(VOP_ISLOCKED(vp)); 641 642 tmpfs_update(vp, NULL, NULL, 0); 643 644 return 0; 645 } 646 647 /* --------------------------------------------------------------------- */ 648 649 int 650 tmpfs_remove(void *v) 651 { 652 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 653 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 654 655 int error; 656 struct tmpfs_dirent *de; 657 struct tmpfs_mount *tmp; 658 struct tmpfs_node *dnode; 659 struct tmpfs_node *node; 660 661 KASSERT(VOP_ISLOCKED(dvp)); 662 KASSERT(VOP_ISLOCKED(vp)); 663 664 if (vp->v_type == VDIR) { 665 error = EPERM; 666 goto out; 667 } 668 669 dnode = VP_TO_TMPFS_DIR(dvp); 670 node = VP_TO_TMPFS_NODE(vp); 671 tmp = VFS_TO_TMPFS(vp->v_mount); 672 de = node->tn_lookup_dirent; 673 KASSERT(de != NULL); 674 675 /* Files marked as immutable or append-only cannot be deleted. */ 676 if (node->tn_flags & (IMMUTABLE | APPEND)) { 677 error = EPERM; 678 goto out; 679 } 680 681 /* Remove the entry from the directory; as it is a file, we do not 682 * have to change the number of hard links of the directory. */ 683 tmpfs_dir_detach(dvp, de); 684 685 /* Free the directory entry we just deleted. Note that the node 686 * referred by it will not be removed until the vnode is really 687 * reclaimed. */ 688 tmpfs_free_dirent(tmp, de, true); 689 690 error = 0; 691 692 out: 693 vput(vp); 694 if (dvp == vp) 695 vrele(dvp); 696 else 697 vput(dvp); 698 699 KASSERT(!VOP_ISLOCKED(dvp)); 700 701 return error; 702 } 703 704 /* --------------------------------------------------------------------- */ 705 706 int 707 tmpfs_link(void *v) 708 { 709 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 710 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 711 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 712 713 int error; 714 struct tmpfs_dirent *de; 715 struct tmpfs_node *dnode; 716 struct tmpfs_node *node; 717 718 KASSERT(VOP_ISLOCKED(dvp)); 719 KASSERT(!VOP_ISLOCKED(vp)); 720 KASSERT(cnp->cn_flags & HASBUF); 721 KASSERT(dvp != vp); /* XXX When can this be false? */ 722 723 dnode = VP_TO_TMPFS_DIR(dvp); 724 node = VP_TO_TMPFS_NODE(vp); 725 726 /* Lock vp because we will need to run tmpfs_update over it, which 727 * needs the vnode to be locked. */ 728 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 729 if (error != 0) 730 goto out; 731 732 /* XXX: Why aren't the following two tests done by the caller? */ 733 734 /* Hard links of directories are forbidden. */ 735 if (vp->v_type == VDIR) { 736 error = EPERM; 737 goto out; 738 } 739 740 /* Cannot create cross-device links. */ 741 if (dvp->v_mount != vp->v_mount) { 742 error = EXDEV; 743 goto out; 744 } 745 746 /* Ensure that we do not overflow the maximum number of links imposed 747 * by the system. */ 748 KASSERT(node->tn_links <= LINK_MAX); 749 if (node->tn_links == LINK_MAX) { 750 error = EMLINK; 751 goto out; 752 } 753 754 /* We cannot create links of files marked immutable or append-only. */ 755 if (node->tn_flags & (IMMUTABLE | APPEND)) { 756 error = EPERM; 757 goto out; 758 } 759 760 /* Allocate a new directory entry to represent the node. */ 761 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 762 cnp->cn_nameptr, cnp->cn_namelen, &de); 763 if (error != 0) 764 goto out; 765 766 /* Insert the new directory entry into the appropriate directory. */ 767 tmpfs_dir_attach(dvp, de); 768 769 /* vp link count has changed, so update node times. */ 770 node->tn_status |= TMPFS_NODE_CHANGED; 771 tmpfs_update(vp, NULL, NULL, 0); 772 773 error = 0; 774 775 out: 776 if (VOP_ISLOCKED(vp)) 777 VOP_UNLOCK(vp, 0); 778 779 PNBUF_PUT(cnp->cn_pnbuf); 780 781 vput(dvp); 782 783 /* XXX Locking status of dvp does not match manual page. */ 784 KASSERT(!VOP_ISLOCKED(dvp)); 785 KASSERT(!VOP_ISLOCKED(vp)); 786 787 return error; 788 } 789 790 /* --------------------------------------------------------------------- */ 791 792 int 793 tmpfs_rename(void *v) 794 { 795 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 796 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 797 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 798 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 799 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 800 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 801 802 char *newname; 803 int error; 804 struct tmpfs_dirent *de; 805 struct tmpfs_mount *tmp; 806 struct tmpfs_node *fdnode; 807 struct tmpfs_node *fnode; 808 struct tmpfs_node *tnode; 809 struct tmpfs_node *tdnode; 810 811 KASSERT(VOP_ISLOCKED(tdvp)); 812 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 813 KASSERT(fcnp->cn_flags & HASBUF); 814 KASSERT(tcnp->cn_flags & HASBUF); 815 816 fdnode = VP_TO_TMPFS_DIR(fdvp); 817 fnode = VP_TO_TMPFS_NODE(fvp); 818 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 819 de = fnode->tn_lookup_dirent; 820 821 /* Disallow cross-device renames. 822 * XXX Why isn't this done by the caller? */ 823 if (fvp->v_mount != tdvp->v_mount || 824 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 825 error = EXDEV; 826 goto out; 827 } 828 829 tmp = VFS_TO_TMPFS(tdvp->v_mount); 830 tdnode = VP_TO_TMPFS_DIR(tdvp); 831 832 /* If source and target are the same file, there is nothing to do. */ 833 if (fvp == tvp) { 834 error = 0; 835 goto out; 836 } 837 838 /* Avoid manipulating '.' and '..' entries. */ 839 if (de == NULL) { 840 KASSERT(fvp->v_type == VDIR); 841 error = EINVAL; 842 goto out; 843 } 844 KASSERT(de->td_node == fnode); 845 846 /* If replacing an existing entry, ensure we can do the operation. */ 847 if (tvp != NULL) { 848 KASSERT(tnode != NULL); 849 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 850 if (tnode->tn_size > 0) { 851 error = ENOTEMPTY; 852 goto out; 853 } 854 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 855 error = ENOTDIR; 856 goto out; 857 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 858 error = EISDIR; 859 goto out; 860 } else { 861 KASSERT(fnode->tn_type != VDIR && 862 tnode->tn_type != VDIR); 863 } 864 } 865 866 /* If we need to move the directory between entries, lock the 867 * source so that we can safely operate on it. */ 868 869 /* XXX: this is a potential locking order violation! */ 870 if (fdnode != tdnode) { 871 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 872 if (error != 0) 873 goto out; 874 } 875 876 /* Make sure we have the correct cached dirent */ 877 fcnp->cn_flags &= ~(MODMASK | SAVESTART); 878 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; 879 if ((error = relookup(fdvp, &fvp, fcnp))) { 880 goto out_locked; 881 } 882 KASSERT(fvp != NULL); 883 /* Relookup always returns with vpp locked and 1UP referenced */ 884 VOP_UNLOCK(fvp, 0); 885 vrele(((struct vop_rename_args *)v)->a_fvp); 886 887 /* Reacquire values. fvp might have changed. Since we only 888 * used fvp to sanitycheck fcnp values above, we can do this. */ 889 fnode = VP_TO_TMPFS_NODE(fvp); 890 de = fnode->tn_lookup_dirent; 891 892 /* Ensure that we have enough memory to hold the new name, if it 893 * has to be changed. */ 894 if (fcnp->cn_namelen != tcnp->cn_namelen || 895 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 896 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 897 tcnp->cn_namelen, 0); 898 if (newname == NULL) { 899 error = ENOSPC; 900 goto out_locked; 901 } 902 } else 903 newname = NULL; 904 905 /* If the node is being moved to another directory, we have to do 906 * the move. */ 907 if (fdnode != tdnode) { 908 /* In case we are moving a directory, we have to adjust its 909 * parent to point to the new parent. */ 910 if (de->td_node->tn_type == VDIR) { 911 struct tmpfs_node *n; 912 913 /* Ensure the target directory is not a child of the 914 * directory being moved. Otherwise, we'd end up 915 * with stale nodes. */ 916 n = tdnode; 917 while (n != n->tn_spec.tn_dir.tn_parent) { 918 if (n == fnode) { 919 error = EINVAL; 920 goto out_locked; 921 } 922 n = n->tn_spec.tn_dir.tn_parent; 923 } 924 925 /* Adjust the parent pointer. */ 926 TMPFS_VALIDATE_DIR(fnode); 927 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 928 929 /* As a result of changing the target of the '..' 930 * entry, the link count of the source and target 931 * directories has to be adjusted. */ 932 fdnode->tn_links--; 933 tdnode->tn_links++; 934 } 935 936 /* Do the move: just remove the entry from the source directory 937 * and insert it into the target one. */ 938 tmpfs_dir_detach(fdvp, de); 939 tmpfs_dir_attach(tdvp, de); 940 941 /* Notify listeners of fdvp about the change in the directory. 942 * We can do it at this point because we aren't touching fdvp 943 * any more below. */ 944 VN_KNOTE(fdvp, NOTE_WRITE); 945 } 946 947 /* If the name has changed, we need to make it effective by changing 948 * it in the directory entry. */ 949 if (newname != NULL) { 950 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 951 KASSERT(tcnp->cn_namelen < 0xffff); 952 953 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 954 de->td_namelen); 955 de->td_namelen = (uint16_t)tcnp->cn_namelen; 956 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 957 de->td_name = newname; 958 959 fnode->tn_status |= TMPFS_NODE_CHANGED; 960 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 961 } 962 963 /* If we are overwriting an entry, we have to remove the old one 964 * from the target directory. */ 965 if (tvp != NULL) { 966 KASSERT(tnode != NULL); 967 968 /* Remove the old entry from the target directory. */ 969 de = tnode->tn_lookup_dirent; 970 tmpfs_dir_detach(tdvp, de); 971 972 /* Free the directory entry we just deleted. Note that the 973 * node referred by it will not be removed until the vnode is 974 * really reclaimed. */ 975 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, true); 976 } 977 978 /* Notify listeners of tdvp about the change in the directory (either 979 * because a new entry was added or because one was removed) and 980 * listeners of fvp about the rename. */ 981 VN_KNOTE(tdvp, NOTE_WRITE); 982 VN_KNOTE(fvp, NOTE_RENAME); 983 984 error = 0; 985 986 out_locked: 987 if (fdnode != tdnode) 988 VOP_UNLOCK(fdvp, 0); 989 990 out: 991 /* Release target nodes. */ 992 if (tdvp == tvp) 993 vrele(tdvp); 994 else 995 vput(tdvp); 996 if (tvp != NULL) 997 vput(tvp); 998 999 /* Release source nodes. */ 1000 vrele(fdvp); 1001 vrele(fvp); 1002 1003 return error; 1004 } 1005 1006 /* --------------------------------------------------------------------- */ 1007 1008 int 1009 tmpfs_mkdir(void *v) 1010 { 1011 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1012 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1013 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1014 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1015 1016 KASSERT(vap->va_type == VDIR); 1017 1018 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1019 } 1020 1021 /* --------------------------------------------------------------------- */ 1022 1023 int 1024 tmpfs_rmdir(void *v) 1025 { 1026 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1027 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1028 1029 int error; 1030 struct tmpfs_dirent *de; 1031 struct tmpfs_mount *tmp; 1032 struct tmpfs_node *dnode; 1033 struct tmpfs_node *node; 1034 1035 KASSERT(VOP_ISLOCKED(dvp)); 1036 KASSERT(VOP_ISLOCKED(vp)); 1037 1038 tmp = VFS_TO_TMPFS(dvp->v_mount); 1039 dnode = VP_TO_TMPFS_DIR(dvp); 1040 node = VP_TO_TMPFS_DIR(vp); 1041 error = 0; 1042 1043 /* Directories with more than two entries ('.' and '..') cannot be 1044 * removed. */ 1045 if (node->tn_size > 0) { 1046 error = ENOTEMPTY; 1047 goto out; 1048 } 1049 1050 /* This invariant holds only if we are not trying to remove "..". 1051 * We checked for that above so this is safe now. */ 1052 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1053 1054 /* Get the directory entry associated with node (vp). This was 1055 * filled by tmpfs_lookup while looking up the entry. */ 1056 de = node->tn_lookup_dirent; 1057 KASSERT(TMPFS_DIRENT_MATCHES(de, 1058 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1059 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1060 1061 /* Check flags to see if we are allowed to remove the directory. */ 1062 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1063 error = EPERM; 1064 goto out; 1065 } 1066 1067 /* Detach the directory entry from the directory (dnode). */ 1068 tmpfs_dir_detach(dvp, de); 1069 1070 node->tn_links--; 1071 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1072 TMPFS_NODE_MODIFIED; 1073 node->tn_spec.tn_dir.tn_parent->tn_links--; 1074 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1075 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1076 1077 /* Release the parent. */ 1078 cache_purge(dvp); /* XXX Is this needed? */ 1079 1080 /* Free the directory entry we just deleted. Note that the node 1081 * referred by it will not be removed until the vnode is really 1082 * reclaimed. */ 1083 tmpfs_free_dirent(tmp, de, true); 1084 1085 out: 1086 /* Release the nodes. */ 1087 vput(dvp); 1088 vput(vp); 1089 1090 return error; 1091 } 1092 1093 /* --------------------------------------------------------------------- */ 1094 1095 int 1096 tmpfs_symlink(void *v) 1097 { 1098 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1099 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1100 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1101 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1102 char *target = ((struct vop_symlink_args *)v)->a_target; 1103 1104 KASSERT(vap->va_type == VLNK); 1105 1106 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1107 } 1108 1109 /* --------------------------------------------------------------------- */ 1110 1111 int 1112 tmpfs_readdir(void *v) 1113 { 1114 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1115 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1116 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1117 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1118 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1119 1120 int error; 1121 off_t startoff; 1122 off_t cnt; 1123 struct tmpfs_node *node; 1124 1125 KASSERT(VOP_ISLOCKED(vp)); 1126 1127 /* This operation only makes sense on directory nodes. */ 1128 if (vp->v_type != VDIR) { 1129 error = ENOTDIR; 1130 goto out; 1131 } 1132 1133 node = VP_TO_TMPFS_DIR(vp); 1134 1135 startoff = uio->uio_offset; 1136 1137 cnt = 0; 1138 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1139 error = tmpfs_dir_getdotdent(node, uio); 1140 if (error == -1) { 1141 error = 0; 1142 goto outok; 1143 } else if (error != 0) 1144 goto outok; 1145 cnt++; 1146 } 1147 1148 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1149 error = tmpfs_dir_getdotdotdent(node, uio); 1150 if (error == -1) { 1151 error = 0; 1152 goto outok; 1153 } else if (error != 0) 1154 goto outok; 1155 cnt++; 1156 } 1157 1158 error = tmpfs_dir_getdents(node, uio, &cnt); 1159 if (error == -1) 1160 error = 0; 1161 KASSERT(error >= 0); 1162 1163 outok: 1164 /* This label assumes that startoff has been 1165 * initialized. If the compiler didn't spit out warnings, we'd 1166 * simply make this one be 'out' and drop 'outok'. */ 1167 1168 if (eofflag != NULL) 1169 *eofflag = 1170 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1171 1172 /* Update NFS-related variables. */ 1173 if (error == 0 && cookies != NULL && ncookies != NULL) { 1174 off_t i; 1175 off_t off = startoff; 1176 struct tmpfs_dirent *de = NULL; 1177 1178 *ncookies = cnt; 1179 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1180 1181 for (i = 0; i < cnt; i++) { 1182 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1183 if (off == TMPFS_DIRCOOKIE_DOT) { 1184 off = TMPFS_DIRCOOKIE_DOTDOT; 1185 } else { 1186 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1187 de = TAILQ_FIRST(&node->tn_spec. 1188 tn_dir.tn_dir); 1189 } else if (de != NULL) { 1190 de = TAILQ_NEXT(de, td_entries); 1191 } else { 1192 de = tmpfs_dir_lookupbycookie(node, 1193 off); 1194 KASSERT(de != NULL); 1195 de = TAILQ_NEXT(de, td_entries); 1196 } 1197 if (de == NULL) { 1198 off = TMPFS_DIRCOOKIE_EOF; 1199 } else { 1200 off = tmpfs_dircookie(de); 1201 } 1202 } 1203 1204 (*cookies)[i] = off; 1205 } 1206 KASSERT(uio->uio_offset == off); 1207 } 1208 1209 out: 1210 KASSERT(VOP_ISLOCKED(vp)); 1211 1212 return error; 1213 } 1214 1215 /* --------------------------------------------------------------------- */ 1216 1217 int 1218 tmpfs_readlink(void *v) 1219 { 1220 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1221 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1222 1223 int error; 1224 struct tmpfs_node *node; 1225 1226 KASSERT(VOP_ISLOCKED(vp)); 1227 KASSERT(uio->uio_offset == 0); 1228 KASSERT(vp->v_type == VLNK); 1229 1230 node = VP_TO_TMPFS_NODE(vp); 1231 1232 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1233 MIN(node->tn_size, uio->uio_resid), uio); 1234 node->tn_status |= TMPFS_NODE_ACCESSED; 1235 1236 KASSERT(VOP_ISLOCKED(vp)); 1237 1238 return error; 1239 } 1240 1241 /* --------------------------------------------------------------------- */ 1242 1243 int 1244 tmpfs_inactive(void *v) 1245 { 1246 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1247 nlink_t links; 1248 1249 struct tmpfs_node *node; 1250 1251 KASSERT(VOP_ISLOCKED(vp)); 1252 1253 node = VP_TO_TMPFS_NODE(vp); 1254 links = node->tn_links; 1255 1256 VOP_UNLOCK(vp, 0); 1257 1258 if (links == 0) 1259 vrecycle(vp, NULL, curlwp); 1260 1261 return 0; 1262 } 1263 1264 /* --------------------------------------------------------------------- */ 1265 1266 int 1267 tmpfs_reclaim(void *v) 1268 { 1269 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1270 1271 struct tmpfs_mount *tmp; 1272 struct tmpfs_node *node; 1273 1274 KASSERT(!VOP_ISLOCKED(vp)); 1275 1276 node = VP_TO_TMPFS_NODE(vp); 1277 tmp = VFS_TO_TMPFS(vp->v_mount); 1278 1279 cache_purge(vp); 1280 tmpfs_free_vp(vp); 1281 1282 /* If the node referenced by this vnode was deleted by the user, 1283 * we must free its associated data structures (now that the vnode 1284 * is being reclaimed). */ 1285 if (node->tn_links == 0) 1286 tmpfs_free_node(tmp, node); 1287 1288 KASSERT(!VOP_ISLOCKED(vp)); 1289 KASSERT(vp->v_data == NULL); 1290 1291 return 0; 1292 } 1293 1294 /* --------------------------------------------------------------------- */ 1295 1296 int 1297 tmpfs_print(void *v) 1298 { 1299 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1300 1301 struct tmpfs_node *node; 1302 1303 node = VP_TO_TMPFS_NODE(vp); 1304 1305 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1306 node, node->tn_flags, node->tn_links); 1307 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1308 ", status 0x%x\n", 1309 node->tn_mode, node->tn_uid, node->tn_gid, 1310 (uintmax_t)node->tn_size, node->tn_status); 1311 1312 if (vp->v_type == VFIFO) 1313 fifo_printinfo(vp); 1314 lockmgr_printinfo(&vp->v_lock); 1315 1316 printf("\n"); 1317 1318 return 0; 1319 } 1320 1321 /* --------------------------------------------------------------------- */ 1322 1323 int 1324 tmpfs_pathconf(void *v) 1325 { 1326 int name = ((struct vop_pathconf_args *)v)->a_name; 1327 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1328 1329 int error; 1330 1331 error = 0; 1332 1333 switch (name) { 1334 case _PC_LINK_MAX: 1335 *retval = LINK_MAX; 1336 break; 1337 1338 case _PC_NAME_MAX: 1339 *retval = NAME_MAX; 1340 break; 1341 1342 case _PC_PATH_MAX: 1343 *retval = PATH_MAX; 1344 break; 1345 1346 case _PC_PIPE_BUF: 1347 *retval = PIPE_BUF; 1348 break; 1349 1350 case _PC_CHOWN_RESTRICTED: 1351 *retval = 1; 1352 break; 1353 1354 case _PC_NO_TRUNC: 1355 *retval = 1; 1356 break; 1357 1358 case _PC_SYNC_IO: 1359 *retval = 1; 1360 break; 1361 1362 case _PC_FILESIZEBITS: 1363 *retval = 0; /* XXX Don't know which value should I return. */ 1364 break; 1365 1366 default: 1367 error = EINVAL; 1368 } 1369 1370 return error; 1371 } 1372 1373 /* --------------------------------------------------------------------- */ 1374 1375 int 1376 tmpfs_advlock(void *v) 1377 { 1378 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1379 1380 struct tmpfs_node *node; 1381 1382 node = VP_TO_TMPFS_NODE(vp); 1383 1384 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1385 } 1386 1387 /* --------------------------------------------------------------------- */ 1388 1389 int 1390 tmpfs_getpages(void *v) 1391 { 1392 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1393 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1394 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1395 int *count = ((struct vop_getpages_args *)v)->a_count; 1396 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1397 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1398 int advice = ((struct vop_getpages_args *)v)->a_advice; 1399 int flags = ((struct vop_getpages_args *)v)->a_flags; 1400 1401 int error; 1402 int i; 1403 struct tmpfs_node *node; 1404 struct uvm_object *uobj; 1405 int npages = *count; 1406 1407 KASSERT(vp->v_type == VREG); 1408 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1409 1410 node = VP_TO_TMPFS_NODE(vp); 1411 uobj = node->tn_spec.tn_reg.tn_aobj; 1412 1413 /* We currently don't rely on PGO_PASTEOF. */ 1414 1415 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1416 if ((flags & PGO_LOCKED) == 0) 1417 simple_unlock(&vp->v_interlock); 1418 return EINVAL; 1419 } 1420 1421 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1422 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1423 } 1424 1425 if ((flags & PGO_LOCKED) != 0) 1426 return EBUSY; 1427 1428 if ((flags & PGO_NOTIMESTAMP) == 0) { 1429 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1430 node->tn_status |= TMPFS_NODE_ACCESSED; 1431 1432 if ((access_type & VM_PROT_WRITE) != 0) 1433 node->tn_status |= TMPFS_NODE_MODIFIED; 1434 } 1435 1436 simple_unlock(&vp->v_interlock); 1437 1438 /* 1439 * Make sure that the array on which we will store the 1440 * gotten pages is clean. Otherwise uao_get (pointed to by 1441 * the pgo_get below) gets confused and does not return the 1442 * appropriate pages. 1443 * 1444 * XXX This shall be revisited when kern/32166 is addressed 1445 * because the loop to clean m[i] will most likely be redundant 1446 * as well as the PGO_ALLPAGES flag. 1447 */ 1448 if (m != NULL) 1449 for (i = 0; i < npages; i++) 1450 m[i] = NULL; 1451 simple_lock(&uobj->vmobjlock); 1452 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1453 access_type, advice, flags | PGO_ALLPAGES); 1454 #if defined(DEBUG) 1455 { 1456 /* Make sure that all the pages we return are valid. */ 1457 int dbgi; 1458 if (error == 0 && m != NULL) 1459 for (dbgi = 0; dbgi < npages; dbgi++) 1460 KASSERT(m[dbgi] != NULL); 1461 } 1462 #endif 1463 1464 return error; 1465 } 1466 1467 /* --------------------------------------------------------------------- */ 1468 1469 int 1470 tmpfs_putpages(void *v) 1471 { 1472 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1473 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1474 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1475 int flags = ((struct vop_putpages_args *)v)->a_flags; 1476 1477 int error; 1478 struct tmpfs_node *node; 1479 struct uvm_object *uobj; 1480 1481 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1482 1483 node = VP_TO_TMPFS_NODE(vp); 1484 1485 if (vp->v_type != VREG) { 1486 simple_unlock(&vp->v_interlock); 1487 return 0; 1488 } 1489 1490 uobj = node->tn_spec.tn_reg.tn_aobj; 1491 simple_unlock(&vp->v_interlock); 1492 1493 simple_lock(&uobj->vmobjlock); 1494 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1495 1496 /* XXX mtime */ 1497 1498 return error; 1499 } 1500