1 /* $NetBSD: tmpfs_vnops.c,v 1.62 2009/09/03 04:45:28 elad 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 1.62 2009/09/03 04:45:28 elad Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/lockf.h> 52 #include <sys/kauth.h> 53 54 #include <uvm/uvm.h> 55 56 #include <miscfs/fifofs/fifo.h> 57 #include <miscfs/genfs/genfs.h> 58 #include <fs/tmpfs/tmpfs_vnops.h> 59 #include <fs/tmpfs/tmpfs.h> 60 61 /* --------------------------------------------------------------------- */ 62 63 /* 64 * vnode operations vector used for files stored in a tmpfs file system. 65 */ 66 int (**tmpfs_vnodeop_p)(void *); 67 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 68 { &vop_default_desc, vn_default_error }, 69 { &vop_lookup_desc, tmpfs_lookup }, 70 { &vop_create_desc, tmpfs_create }, 71 { &vop_mknod_desc, tmpfs_mknod }, 72 { &vop_open_desc, tmpfs_open }, 73 { &vop_close_desc, tmpfs_close }, 74 { &vop_access_desc, tmpfs_access }, 75 { &vop_getattr_desc, tmpfs_getattr }, 76 { &vop_setattr_desc, tmpfs_setattr }, 77 { &vop_read_desc, tmpfs_read }, 78 { &vop_write_desc, tmpfs_write }, 79 { &vop_ioctl_desc, tmpfs_ioctl }, 80 { &vop_fcntl_desc, tmpfs_fcntl }, 81 { &vop_poll_desc, tmpfs_poll }, 82 { &vop_kqfilter_desc, tmpfs_kqfilter }, 83 { &vop_revoke_desc, tmpfs_revoke }, 84 { &vop_mmap_desc, tmpfs_mmap }, 85 { &vop_fsync_desc, tmpfs_fsync }, 86 { &vop_seek_desc, tmpfs_seek }, 87 { &vop_remove_desc, tmpfs_remove }, 88 { &vop_link_desc, tmpfs_link }, 89 { &vop_rename_desc, tmpfs_rename }, 90 { &vop_mkdir_desc, tmpfs_mkdir }, 91 { &vop_rmdir_desc, tmpfs_rmdir }, 92 { &vop_symlink_desc, tmpfs_symlink }, 93 { &vop_readdir_desc, tmpfs_readdir }, 94 { &vop_readlink_desc, tmpfs_readlink }, 95 { &vop_abortop_desc, tmpfs_abortop }, 96 { &vop_inactive_desc, tmpfs_inactive }, 97 { &vop_reclaim_desc, tmpfs_reclaim }, 98 { &vop_lock_desc, tmpfs_lock }, 99 { &vop_unlock_desc, tmpfs_unlock }, 100 { &vop_bmap_desc, tmpfs_bmap }, 101 { &vop_strategy_desc, tmpfs_strategy }, 102 { &vop_print_desc, tmpfs_print }, 103 { &vop_pathconf_desc, tmpfs_pathconf }, 104 { &vop_islocked_desc, tmpfs_islocked }, 105 { &vop_advlock_desc, tmpfs_advlock }, 106 { &vop_bwrite_desc, tmpfs_bwrite }, 107 { &vop_getpages_desc, tmpfs_getpages }, 108 { &vop_putpages_desc, tmpfs_putpages }, 109 { NULL, NULL } 110 }; 111 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 112 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 113 114 /* --------------------------------------------------------------------- */ 115 116 int 117 tmpfs_lookup(void *v) 118 { 119 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 120 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 121 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 122 123 int error; 124 struct tmpfs_dirent *de; 125 struct tmpfs_node *dnode; 126 127 KASSERT(VOP_ISLOCKED(dvp)); 128 129 dnode = VP_TO_TMPFS_DIR(dvp); 130 *vpp = NULL; 131 132 /* Check accessibility of requested node as a first step. */ 133 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 134 if (error != 0) 135 goto out; 136 137 /* If requesting the last path component on a read-only file system 138 * with a write operation, deny it. */ 139 if ((cnp->cn_flags & ISLASTCN) && 140 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 141 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 142 error = EROFS; 143 goto out; 144 } 145 146 /* Avoid doing a linear scan of the directory if the requested 147 * directory/name couple is already in the cache. */ 148 error = cache_lookup(dvp, vpp, cnp); 149 if (error >= 0) 150 goto out; 151 152 /* We cannot be requesting the parent directory of the root node. */ 153 KASSERT(IMPLIES(dnode->tn_type == VDIR && 154 dnode->tn_spec.tn_dir.tn_parent == dnode, 155 !(cnp->cn_flags & ISDOTDOT))); 156 157 if (cnp->cn_flags & ISDOTDOT) { 158 VOP_UNLOCK(dvp, 0); 159 160 /* Allocate a new vnode on the matching entry. */ 161 error = tmpfs_alloc_vp(dvp->v_mount, 162 dnode->tn_spec.tn_dir.tn_parent, vpp); 163 164 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 165 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 166 VREF(dvp); 167 *vpp = dvp; 168 error = 0; 169 } else { 170 de = tmpfs_dir_lookup(dnode, cnp); 171 if (de == NULL) { 172 /* The entry was not found in the directory. 173 * This is OK iff we are creating or renaming an 174 * entry and are working on the last component of 175 * the path name. */ 176 if ((cnp->cn_flags & ISLASTCN) && 177 (cnp->cn_nameiop == CREATE || \ 178 cnp->cn_nameiop == RENAME)) { 179 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 180 if (error != 0) 181 goto out; 182 183 /* Keep the component name in the buffer for 184 * future uses. */ 185 cnp->cn_flags |= SAVENAME; 186 187 error = EJUSTRETURN; 188 } else 189 error = ENOENT; 190 } else { 191 struct tmpfs_node *tnode; 192 193 /* The entry was found, so get its associated 194 * tmpfs_node. */ 195 tnode = de->td_node; 196 197 /* If we are not at the last path component and 198 * found a non-directory or non-link entry (which 199 * may itself be pointing to a directory), raise 200 * an error. */ 201 if ((tnode->tn_type != VDIR && 202 tnode->tn_type != VLNK) && 203 !(cnp->cn_flags & ISLASTCN)) { 204 error = ENOTDIR; 205 goto out; 206 } 207 208 /* Check permissions */ 209 if ((cnp->cn_flags & ISLASTCN) && 210 (cnp->cn_nameiop == DELETE || 211 cnp->cn_nameiop == RENAME)) { 212 kauth_action_t action = 0; 213 214 /* This is the file-system's decision. */ 215 if ((dnode->tn_mode & S_ISTXT) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 error = EPERM; 219 else 220 error = 0; 221 222 /* Only bother if we're not already failing it. */ 223 if (!error) { 224 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 225 } 226 227 if (cnp->cn_nameiop == DELETE) 228 action |= KAUTH_VNODE_DELETE; 229 else /* if (cnp->cn_nameiop == RENAME) */ 230 action |= KAUTH_VNODE_RENAME; 231 232 error = kauth_authorize_vnode(cnp->cn_cred, 233 action, *vpp, dvp, error); 234 if (error != 0) 235 goto out; 236 237 cnp->cn_flags |= SAVENAME; 238 } else 239 de = NULL; 240 241 /* Allocate a new vnode on the matching entry. */ 242 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 243 } 244 } 245 246 /* Store the result of this lookup in the cache. Avoid this if the 247 * request was for creation, as it does not improve timings on 248 * emprical tests. */ 249 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 250 (cnp->cn_flags & ISDOTDOT) == 0) 251 cache_enter(dvp, *vpp, cnp); 252 253 out: 254 /* If there were no errors, *vpp cannot be null and it must be 255 * locked. */ 256 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 257 258 /* dvp must always be locked. */ 259 KASSERT(VOP_ISLOCKED(dvp)); 260 261 return error; 262 } 263 264 /* --------------------------------------------------------------------- */ 265 266 int 267 tmpfs_create(void *v) 268 { 269 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 270 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 271 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 272 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 273 274 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 275 276 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 277 } 278 /* --------------------------------------------------------------------- */ 279 280 int 281 tmpfs_mknod(void *v) 282 { 283 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 284 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 285 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 286 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 287 288 if (vap->va_type != VBLK && vap->va_type != VCHR && 289 vap->va_type != VFIFO) { 290 vput(dvp); 291 return EINVAL; 292 } 293 294 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 295 } 296 297 /* --------------------------------------------------------------------- */ 298 299 int 300 tmpfs_open(void *v) 301 { 302 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 303 int mode = ((struct vop_open_args *)v)->a_mode; 304 305 int error; 306 struct tmpfs_node *node; 307 308 KASSERT(VOP_ISLOCKED(vp)); 309 310 node = VP_TO_TMPFS_NODE(vp); 311 312 /* The file is still active but all its names have been removed 313 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 314 * it is about to die. */ 315 if (node->tn_links < 1) { 316 error = ENOENT; 317 goto out; 318 } 319 320 /* If the file is marked append-only, deny write requests. */ 321 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 322 error = EPERM; 323 else 324 error = 0; 325 326 out: 327 KASSERT(VOP_ISLOCKED(vp)); 328 329 return error; 330 } 331 332 /* --------------------------------------------------------------------- */ 333 334 int 335 tmpfs_close(void *v) 336 { 337 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 338 339 struct tmpfs_node *node; 340 341 KASSERT(VOP_ISLOCKED(vp)); 342 343 node = VP_TO_TMPFS_NODE(vp); 344 345 if (node->tn_links > 0) { 346 /* Update node times. No need to do it if the node has 347 * been deleted, because it will vanish after we return. */ 348 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 349 } 350 351 return 0; 352 } 353 354 /* --------------------------------------------------------------------- */ 355 356 static int 357 tmpfs_check_possible(struct vnode *vp, struct tmpfs_node *node, mode_t mode) 358 { 359 int error = 0; 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 out: 393 return error; 394 } 395 396 static int 397 tmpfs_check_permitted(struct vnode *vp, struct tmpfs_node *node, mode_t mode, 398 kauth_cred_t cred) 399 { 400 401 return genfs_can_access(vp->v_type, node->tn_mode, node->tn_uid, 402 node->tn_gid, mode, cred); 403 } 404 405 int 406 tmpfs_access(void *v) 407 { 408 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 409 int mode = ((struct vop_access_args *)v)->a_mode; 410 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 411 412 int error; 413 struct tmpfs_node *node; 414 415 KASSERT(VOP_ISLOCKED(vp)); 416 417 node = VP_TO_TMPFS_NODE(vp); 418 419 error = tmpfs_check_possible(vp, node, mode); 420 if (error) 421 goto out; 422 423 error = tmpfs_check_permitted(vp, node, mode, cred); 424 425 error = kauth_authorize_vnode(cred, kauth_mode_to_action(mode), vp, 426 NULL, error); 427 428 out: 429 KASSERT(VOP_ISLOCKED(vp)); 430 431 return error; 432 } 433 434 /* --------------------------------------------------------------------- */ 435 436 int 437 tmpfs_getattr(void *v) 438 { 439 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 440 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 441 442 struct tmpfs_node *node; 443 444 node = VP_TO_TMPFS_NODE(vp); 445 446 VATTR_NULL(vap); 447 448 tmpfs_itimes(vp, NULL, NULL, NULL); 449 450 vap->va_type = vp->v_type; 451 vap->va_mode = node->tn_mode; 452 vap->va_nlink = node->tn_links; 453 vap->va_uid = node->tn_uid; 454 vap->va_gid = node->tn_gid; 455 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 456 vap->va_fileid = node->tn_id; 457 vap->va_size = node->tn_size; 458 vap->va_blocksize = PAGE_SIZE; 459 vap->va_atime = node->tn_atime; 460 vap->va_mtime = node->tn_mtime; 461 vap->va_ctime = node->tn_ctime; 462 vap->va_birthtime = node->tn_birthtime; 463 vap->va_gen = node->tn_gen; 464 vap->va_flags = node->tn_flags; 465 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 466 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 467 vap->va_bytes = round_page(node->tn_size); 468 vap->va_filerev = VNOVAL; 469 vap->va_vaflags = 0; 470 vap->va_spare = VNOVAL; /* XXX */ 471 472 return 0; 473 } 474 475 /* --------------------------------------------------------------------- */ 476 477 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 478 /* XXX Should this operation be atomic? I think it should, but code in 479 * XXX other places (e.g., ufs) doesn't seem to be... */ 480 int 481 tmpfs_setattr(void *v) 482 { 483 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 484 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 485 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 486 struct lwp *l = curlwp; 487 488 int error; 489 490 KASSERT(VOP_ISLOCKED(vp)); 491 492 error = 0; 493 494 /* Abort if any unsettable attribute is given. */ 495 if (vap->va_type != VNON || 496 vap->va_nlink != VNOVAL || 497 vap->va_fsid != VNOVAL || 498 vap->va_fileid != VNOVAL || 499 vap->va_blocksize != VNOVAL || 500 GOODTIME(&vap->va_ctime) || 501 vap->va_gen != VNOVAL || 502 vap->va_rdev != VNOVAL || 503 vap->va_bytes != VNOVAL) 504 error = EINVAL; 505 506 if (error == 0 && (vap->va_flags != VNOVAL)) 507 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 508 509 if (error == 0 && (vap->va_size != VNOVAL)) 510 error = tmpfs_chsize(vp, vap->va_size, cred, l); 511 512 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 513 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 514 515 if (error == 0 && (vap->va_mode != VNOVAL)) 516 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 517 518 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 519 || GOODTIME(&vap->va_birthtime))) 520 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 521 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 522 return 0; 523 524 /* Update the node times. We give preference to the error codes 525 * generated by this function rather than the ones that may arise 526 * from tmpfs_update. */ 527 tmpfs_update(vp, NULL, NULL, NULL, 0); 528 529 KASSERT(VOP_ISLOCKED(vp)); 530 531 return error; 532 } 533 534 /* --------------------------------------------------------------------- */ 535 536 int 537 tmpfs_read(void *v) 538 { 539 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 540 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 541 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 542 543 int error; 544 struct tmpfs_node *node; 545 struct uvm_object *uobj; 546 547 KASSERT(VOP_ISLOCKED(vp)); 548 549 node = VP_TO_TMPFS_NODE(vp); 550 551 if (vp->v_type != VREG) { 552 error = EISDIR; 553 goto out; 554 } 555 556 if (uio->uio_offset < 0) { 557 error = EINVAL; 558 goto out; 559 } 560 561 node->tn_status |= TMPFS_NODE_ACCESSED; 562 563 uobj = node->tn_spec.tn_reg.tn_aobj; 564 error = 0; 565 while (error == 0 && uio->uio_resid > 0) { 566 vsize_t len; 567 568 if (node->tn_size <= uio->uio_offset) 569 break; 570 571 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 572 if (len == 0) 573 break; 574 575 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 576 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 577 } 578 579 out: 580 KASSERT(VOP_ISLOCKED(vp)); 581 582 return error; 583 } 584 585 /* --------------------------------------------------------------------- */ 586 587 int 588 tmpfs_write(void *v) 589 { 590 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 591 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 592 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 593 594 bool extended; 595 int error; 596 off_t oldsize; 597 struct tmpfs_node *node; 598 struct uvm_object *uobj; 599 600 KASSERT(VOP_ISLOCKED(vp)); 601 602 node = VP_TO_TMPFS_NODE(vp); 603 oldsize = node->tn_size; 604 605 if (uio->uio_offset < 0 || vp->v_type != VREG) { 606 error = EINVAL; 607 goto out; 608 } 609 610 if (uio->uio_resid == 0) { 611 error = 0; 612 goto out; 613 } 614 615 if (ioflag & IO_APPEND) 616 uio->uio_offset = node->tn_size; 617 618 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 619 if (extended) { 620 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 621 if (error != 0) 622 goto out; 623 } 624 625 uobj = node->tn_spec.tn_reg.tn_aobj; 626 error = 0; 627 while (error == 0 && uio->uio_resid > 0) { 628 vsize_t len; 629 630 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 631 if (len == 0) 632 break; 633 634 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 635 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 636 } 637 638 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 639 (extended ? TMPFS_NODE_CHANGED : 0); 640 641 if (error != 0) 642 (void)tmpfs_reg_resize(vp, oldsize); 643 644 VN_KNOTE(vp, NOTE_WRITE); 645 646 out: 647 KASSERT(VOP_ISLOCKED(vp)); 648 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 649 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 650 651 return error; 652 } 653 654 /* --------------------------------------------------------------------- */ 655 656 int 657 tmpfs_fsync(void *v) 658 { 659 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 660 661 KASSERT(VOP_ISLOCKED(vp)); 662 663 tmpfs_update(vp, NULL, NULL, NULL, 0); 664 665 return 0; 666 } 667 668 /* --------------------------------------------------------------------- */ 669 670 int 671 tmpfs_remove(void *v) 672 { 673 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 674 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 675 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 676 677 int error; 678 struct tmpfs_dirent *de; 679 struct tmpfs_mount *tmp; 680 struct tmpfs_node *dnode; 681 struct tmpfs_node *node; 682 683 KASSERT(VOP_ISLOCKED(dvp)); 684 KASSERT(VOP_ISLOCKED(vp)); 685 686 if (vp->v_type == VDIR) { 687 error = EPERM; 688 goto out; 689 } 690 691 dnode = VP_TO_TMPFS_DIR(dvp); 692 node = VP_TO_TMPFS_NODE(vp); 693 tmp = VFS_TO_TMPFS(vp->v_mount); 694 de = tmpfs_dir_lookup(dnode, cnp); 695 KASSERT(de); 696 KASSERT(de->td_node == node); 697 698 /* Files marked as immutable or append-only cannot be deleted. */ 699 if (node->tn_flags & (IMMUTABLE | APPEND)) { 700 error = EPERM; 701 goto out; 702 } 703 704 /* Remove the entry from the directory; as it is a file, we do not 705 * have to change the number of hard links of the directory. */ 706 tmpfs_dir_detach(dvp, de); 707 708 /* Free the directory entry we just deleted. Note that the node 709 * referred by it will not be removed until the vnode is really 710 * reclaimed. */ 711 tmpfs_free_dirent(tmp, de, true); 712 713 error = 0; 714 715 out: 716 vput(vp); 717 if (dvp == vp) 718 vrele(dvp); 719 else 720 vput(dvp); 721 PNBUF_PUT(cnp->cn_pnbuf); 722 723 return error; 724 } 725 726 /* --------------------------------------------------------------------- */ 727 728 int 729 tmpfs_link(void *v) 730 { 731 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 732 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 733 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 734 735 int error; 736 struct tmpfs_dirent *de; 737 struct tmpfs_node *dnode; 738 struct tmpfs_node *node; 739 740 KASSERT(VOP_ISLOCKED(dvp)); 741 KASSERT(cnp->cn_flags & HASBUF); 742 KASSERT(dvp != vp); /* XXX When can this be false? */ 743 744 dnode = VP_TO_TMPFS_DIR(dvp); 745 node = VP_TO_TMPFS_NODE(vp); 746 747 /* Lock vp because we will need to run tmpfs_update over it, which 748 * needs the vnode to be locked. */ 749 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 750 if (error != 0) 751 goto out1; 752 753 /* XXX: Why aren't the following two tests done by the caller? */ 754 755 /* Hard links of directories are forbidden. */ 756 if (vp->v_type == VDIR) { 757 error = EPERM; 758 goto out; 759 } 760 761 /* Cannot create cross-device links. */ 762 if (dvp->v_mount != vp->v_mount) { 763 error = EXDEV; 764 goto out; 765 } 766 767 /* Ensure that we do not overflow the maximum number of links imposed 768 * by the system. */ 769 KASSERT(node->tn_links <= LINK_MAX); 770 if (node->tn_links == LINK_MAX) { 771 error = EMLINK; 772 goto out; 773 } 774 775 /* We cannot create links of files marked immutable or append-only. */ 776 if (node->tn_flags & (IMMUTABLE | APPEND)) { 777 error = EPERM; 778 goto out; 779 } 780 781 /* Allocate a new directory entry to represent the node. */ 782 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 783 cnp->cn_nameptr, cnp->cn_namelen, &de); 784 if (error != 0) 785 goto out; 786 787 /* Insert the new directory entry into the appropriate directory. */ 788 tmpfs_dir_attach(dvp, de); 789 790 /* vp link count has changed, so update node times. */ 791 node->tn_status |= TMPFS_NODE_CHANGED; 792 tmpfs_update(vp, NULL, NULL, NULL, 0); 793 794 error = 0; 795 796 out: 797 VOP_UNLOCK(vp, 0); 798 out1: 799 PNBUF_PUT(cnp->cn_pnbuf); 800 801 vput(dvp); 802 803 return error; 804 } 805 806 /* --------------------------------------------------------------------- */ 807 808 int 809 tmpfs_rename(void *v) 810 { 811 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 812 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 813 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 814 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 815 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 816 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 817 818 char *newname; 819 int error; 820 struct tmpfs_dirent *de, *de2; 821 struct tmpfs_mount *tmp; 822 struct tmpfs_node *fdnode; 823 struct tmpfs_node *fnode; 824 struct tmpfs_node *tnode; 825 struct tmpfs_node *tdnode; 826 size_t namelen; 827 828 KASSERT(VOP_ISLOCKED(tdvp)); 829 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 830 KASSERT(fcnp->cn_flags & HASBUF); 831 KASSERT(tcnp->cn_flags & HASBUF); 832 833 newname = NULL; 834 namelen = 0; 835 tmp = NULL; 836 837 /* Disallow cross-device renames. */ 838 if (fvp->v_mount != tdvp->v_mount || 839 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 840 error = EXDEV; 841 goto out_unlocked; 842 } 843 844 fnode = VP_TO_TMPFS_NODE(fvp); 845 fdnode = VP_TO_TMPFS_DIR(fdvp); 846 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 847 tdnode = VP_TO_TMPFS_DIR(tdvp); 848 tmp = VFS_TO_TMPFS(tdvp->v_mount); 849 850 if (fdvp == tvp) { 851 error = 0; 852 goto out_unlocked; 853 } 854 855 /* If we need to move the directory between entries, lock the 856 * source so that we can safely operate on it. */ 857 858 /* XXX: this is a potential locking order violation! */ 859 if (fdnode != tdnode) { 860 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 861 if (error != 0) 862 goto out_unlocked; 863 } 864 865 /* 866 * If the node we were renaming has scarpered, just give up. 867 */ 868 de = tmpfs_dir_lookup(fdnode, fcnp); 869 if (de == NULL || de->td_node != fnode) { 870 error = ENOENT; 871 goto out; 872 } 873 874 /* If source and target are the same file, there is nothing to do. */ 875 if (fvp == tvp) { 876 error = 0; 877 goto out; 878 } 879 880 /* If replacing an existing entry, ensure we can do the operation. */ 881 if (tvp != NULL) { 882 KASSERT(tnode != NULL); 883 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 884 if (tnode->tn_size > 0) { 885 error = ENOTEMPTY; 886 goto out; 887 } 888 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 889 error = ENOTDIR; 890 goto out; 891 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 892 error = EISDIR; 893 goto out; 894 } else { 895 KASSERT(fnode->tn_type != VDIR && 896 tnode->tn_type != VDIR); 897 } 898 } 899 900 /* Ensure that we have enough memory to hold the new name, if it 901 * has to be changed. */ 902 namelen = tcnp->cn_namelen; 903 if (fcnp->cn_namelen != tcnp->cn_namelen || 904 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 905 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 906 if (newname == NULL) { 907 error = ENOSPC; 908 goto out; 909 } 910 } 911 912 /* If the node is being moved to another directory, we have to do 913 * the move. */ 914 if (fdnode != tdnode) { 915 /* In case we are moving a directory, we have to adjust its 916 * parent to point to the new parent. */ 917 if (de->td_node->tn_type == VDIR) { 918 struct tmpfs_node *n; 919 920 /* Ensure the target directory is not a child of the 921 * directory being moved. Otherwise, we'd end up 922 * with stale nodes. */ 923 n = tdnode; 924 while (n != n->tn_spec.tn_dir.tn_parent) { 925 if (n == fnode) { 926 error = EINVAL; 927 goto out; 928 } 929 n = n->tn_spec.tn_dir.tn_parent; 930 } 931 932 /* Adjust the parent pointer. */ 933 TMPFS_VALIDATE_DIR(fnode); 934 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 935 936 /* As a result of changing the target of the '..' 937 * entry, the link count of the source and target 938 * directories has to be adjusted. */ 939 fdnode->tn_links--; 940 tdnode->tn_links++; 941 } 942 943 /* Do the move: just remove the entry from the source directory 944 * and insert it into the target one. */ 945 tmpfs_dir_detach(fdvp, de); 946 tmpfs_dir_attach(tdvp, de); 947 948 /* Notify listeners of fdvp about the change in the directory. 949 * We can do it at this point because we aren't touching fdvp 950 * any more below. */ 951 VN_KNOTE(fdvp, NOTE_WRITE); 952 } 953 954 /* If we are overwriting an entry, we have to remove the old one 955 * from the target directory. */ 956 if (tvp != NULL) { 957 KASSERT(tnode != NULL); 958 959 /* Remove the old entry from the target directory. 960 * Note! This relies on tmpfs_dir_attach() putting the new 961 * node on the end of the target's node list. */ 962 de2 = tmpfs_dir_lookup(tdnode, tcnp); 963 KASSERT(de2 != NULL); 964 KASSERT(de2->td_node == tnode); 965 tmpfs_dir_detach(tdvp, de2); 966 967 /* Free the directory entry we just deleted. Note that the 968 * node referred by it will not be removed until the vnode is 969 * really reclaimed. */ 970 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 971 } 972 973 /* If the name has changed, we need to make it effective by changing 974 * it in the directory entry. */ 975 if (newname != NULL) { 976 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 977 KASSERT(tcnp->cn_namelen < 0xffff); 978 979 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 980 de->td_namelen); 981 de->td_namelen = (uint16_t)namelen; 982 memcpy(newname, tcnp->cn_nameptr, namelen); 983 de->td_name = newname; 984 newname = NULL; 985 986 fnode->tn_status |= TMPFS_NODE_CHANGED; 987 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 988 } 989 990 /* Notify listeners of tdvp about the change in the directory (either 991 * because a new entry was added or because one was removed) and 992 * listeners of fvp about the rename. */ 993 VN_KNOTE(tdvp, NOTE_WRITE); 994 VN_KNOTE(fvp, NOTE_RENAME); 995 996 error = 0; 997 998 out: 999 if (fdnode != tdnode) 1000 VOP_UNLOCK(fdvp, 0); 1001 1002 out_unlocked: 1003 /* Release target nodes. */ 1004 if (tdvp == tvp) 1005 vrele(tdvp); 1006 else 1007 vput(tdvp); 1008 if (tvp != NULL) 1009 vput(tvp); 1010 1011 /* Release source nodes. */ 1012 vrele(fdvp); 1013 vrele(fvp); 1014 1015 if (newname != NULL) 1016 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 1017 1018 return error; 1019 } 1020 1021 /* --------------------------------------------------------------------- */ 1022 1023 int 1024 tmpfs_mkdir(void *v) 1025 { 1026 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1027 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1028 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1029 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1030 1031 KASSERT(vap->va_type == VDIR); 1032 1033 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1034 } 1035 1036 /* --------------------------------------------------------------------- */ 1037 1038 int 1039 tmpfs_rmdir(void *v) 1040 { 1041 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1042 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1043 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1044 1045 int error; 1046 struct tmpfs_dirent *de; 1047 struct tmpfs_mount *tmp; 1048 struct tmpfs_node *dnode; 1049 struct tmpfs_node *node; 1050 1051 KASSERT(VOP_ISLOCKED(dvp)); 1052 KASSERT(VOP_ISLOCKED(vp)); 1053 1054 tmp = VFS_TO_TMPFS(dvp->v_mount); 1055 dnode = VP_TO_TMPFS_DIR(dvp); 1056 node = VP_TO_TMPFS_DIR(vp); 1057 error = 0; 1058 1059 /* Directories with more than two entries ('.' and '..') cannot be 1060 * removed. */ 1061 if (node->tn_size > 0) { 1062 error = ENOTEMPTY; 1063 goto out; 1064 } 1065 1066 /* This invariant holds only if we are not trying to remove "..". 1067 * We checked for that above so this is safe now. */ 1068 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1069 1070 /* Get the directory entry associated with node (vp). */ 1071 de = tmpfs_dir_lookup(dnode, cnp); 1072 KASSERT(de); 1073 KASSERT(de->td_node == node); 1074 1075 /* Check flags to see if we are allowed to remove the directory. */ 1076 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1077 error = EPERM; 1078 goto out; 1079 } 1080 1081 /* Detach the directory entry from the directory (dnode). */ 1082 tmpfs_dir_detach(dvp, de); 1083 1084 node->tn_links--; 1085 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1086 TMPFS_NODE_MODIFIED; 1087 node->tn_spec.tn_dir.tn_parent->tn_links--; 1088 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1089 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1090 1091 /* Release the parent. */ 1092 cache_purge(dvp); /* XXX Is this needed? */ 1093 1094 /* Free the directory entry we just deleted. Note that the node 1095 * referred by it will not be removed until the vnode is really 1096 * reclaimed. */ 1097 tmpfs_free_dirent(tmp, de, true); 1098 1099 KASSERT(node->tn_links == 0); 1100 out: 1101 /* Release the nodes. */ 1102 vput(dvp); 1103 vput(vp); 1104 PNBUF_PUT(cnp->cn_pnbuf); 1105 1106 return error; 1107 } 1108 1109 /* --------------------------------------------------------------------- */ 1110 1111 int 1112 tmpfs_symlink(void *v) 1113 { 1114 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1115 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1116 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1117 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1118 char *target = ((struct vop_symlink_args *)v)->a_target; 1119 1120 KASSERT(vap->va_type == VLNK); 1121 1122 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1123 } 1124 1125 /* --------------------------------------------------------------------- */ 1126 1127 int 1128 tmpfs_readdir(void *v) 1129 { 1130 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1131 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1132 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1133 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1134 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1135 1136 int error; 1137 off_t startoff; 1138 off_t cnt; 1139 struct tmpfs_node *node; 1140 1141 KASSERT(VOP_ISLOCKED(vp)); 1142 1143 /* This operation only makes sense on directory nodes. */ 1144 if (vp->v_type != VDIR) { 1145 error = ENOTDIR; 1146 goto out; 1147 } 1148 1149 node = VP_TO_TMPFS_DIR(vp); 1150 1151 startoff = uio->uio_offset; 1152 1153 cnt = 0; 1154 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1155 error = tmpfs_dir_getdotdent(node, uio); 1156 if (error == -1) { 1157 error = 0; 1158 goto outok; 1159 } else if (error != 0) 1160 goto outok; 1161 cnt++; 1162 } 1163 1164 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1165 error = tmpfs_dir_getdotdotdent(node, uio); 1166 if (error == -1) { 1167 error = 0; 1168 goto outok; 1169 } else if (error != 0) 1170 goto outok; 1171 cnt++; 1172 } 1173 1174 error = tmpfs_dir_getdents(node, uio, &cnt); 1175 if (error == -1) 1176 error = 0; 1177 KASSERT(error >= 0); 1178 1179 outok: 1180 /* This label assumes that startoff has been 1181 * initialized. If the compiler didn't spit out warnings, we'd 1182 * simply make this one be 'out' and drop 'outok'. */ 1183 1184 if (eofflag != NULL) 1185 *eofflag = 1186 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1187 1188 /* Update NFS-related variables. */ 1189 if (error == 0 && cookies != NULL && ncookies != NULL) { 1190 off_t i; 1191 off_t off = startoff; 1192 struct tmpfs_dirent *de = NULL; 1193 1194 *ncookies = cnt; 1195 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1196 1197 for (i = 0; i < cnt; i++) { 1198 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1199 if (off == TMPFS_DIRCOOKIE_DOT) { 1200 off = TMPFS_DIRCOOKIE_DOTDOT; 1201 } else { 1202 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1203 de = TAILQ_FIRST(&node->tn_spec. 1204 tn_dir.tn_dir); 1205 } else if (de != NULL) { 1206 de = TAILQ_NEXT(de, td_entries); 1207 } else { 1208 de = tmpfs_dir_lookupbycookie(node, 1209 off); 1210 KASSERT(de != NULL); 1211 de = TAILQ_NEXT(de, td_entries); 1212 } 1213 if (de == NULL) { 1214 off = TMPFS_DIRCOOKIE_EOF; 1215 } else { 1216 off = tmpfs_dircookie(de); 1217 } 1218 } 1219 1220 (*cookies)[i] = off; 1221 } 1222 KASSERT(uio->uio_offset == off); 1223 } 1224 1225 out: 1226 KASSERT(VOP_ISLOCKED(vp)); 1227 1228 return error; 1229 } 1230 1231 /* --------------------------------------------------------------------- */ 1232 1233 int 1234 tmpfs_readlink(void *v) 1235 { 1236 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1237 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1238 1239 int error; 1240 struct tmpfs_node *node; 1241 1242 KASSERT(VOP_ISLOCKED(vp)); 1243 KASSERT(uio->uio_offset == 0); 1244 KASSERT(vp->v_type == VLNK); 1245 1246 node = VP_TO_TMPFS_NODE(vp); 1247 1248 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1249 MIN(node->tn_size, uio->uio_resid), uio); 1250 node->tn_status |= TMPFS_NODE_ACCESSED; 1251 1252 KASSERT(VOP_ISLOCKED(vp)); 1253 1254 return error; 1255 } 1256 1257 /* --------------------------------------------------------------------- */ 1258 1259 int 1260 tmpfs_inactive(void *v) 1261 { 1262 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1263 1264 struct tmpfs_node *node; 1265 1266 KASSERT(VOP_ISLOCKED(vp)); 1267 1268 node = VP_TO_TMPFS_NODE(vp); 1269 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1270 VOP_UNLOCK(vp, 0); 1271 1272 return 0; 1273 } 1274 1275 /* --------------------------------------------------------------------- */ 1276 1277 int 1278 tmpfs_reclaim(void *v) 1279 { 1280 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1281 1282 struct tmpfs_mount *tmp; 1283 struct tmpfs_node *node; 1284 1285 node = VP_TO_TMPFS_NODE(vp); 1286 tmp = VFS_TO_TMPFS(vp->v_mount); 1287 1288 cache_purge(vp); 1289 tmpfs_free_vp(vp); 1290 1291 /* If the node referenced by this vnode was deleted by the user, 1292 * we must free its associated data structures (now that the vnode 1293 * is being reclaimed). */ 1294 if (node->tn_links == 0) 1295 tmpfs_free_node(tmp, node); 1296 1297 KASSERT(vp->v_data == NULL); 1298 1299 return 0; 1300 } 1301 1302 /* --------------------------------------------------------------------- */ 1303 1304 int 1305 tmpfs_print(void *v) 1306 { 1307 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1308 1309 struct tmpfs_node *node; 1310 1311 node = VP_TO_TMPFS_NODE(vp); 1312 1313 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1314 node, node->tn_flags, node->tn_links); 1315 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1316 ", status 0x%x\n", 1317 node->tn_mode, node->tn_uid, node->tn_gid, 1318 (uintmax_t)node->tn_size, node->tn_status); 1319 if (vp->v_type == VFIFO) 1320 fifo_printinfo(vp); 1321 printf("\n"); 1322 1323 return 0; 1324 } 1325 1326 /* --------------------------------------------------------------------- */ 1327 1328 int 1329 tmpfs_pathconf(void *v) 1330 { 1331 int name = ((struct vop_pathconf_args *)v)->a_name; 1332 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1333 1334 int error; 1335 1336 error = 0; 1337 1338 switch (name) { 1339 case _PC_LINK_MAX: 1340 *retval = LINK_MAX; 1341 break; 1342 1343 case _PC_NAME_MAX: 1344 *retval = NAME_MAX; 1345 break; 1346 1347 case _PC_PATH_MAX: 1348 *retval = PATH_MAX; 1349 break; 1350 1351 case _PC_PIPE_BUF: 1352 *retval = PIPE_BUF; 1353 break; 1354 1355 case _PC_CHOWN_RESTRICTED: 1356 *retval = 1; 1357 break; 1358 1359 case _PC_NO_TRUNC: 1360 *retval = 1; 1361 break; 1362 1363 case _PC_SYNC_IO: 1364 *retval = 1; 1365 break; 1366 1367 case _PC_FILESIZEBITS: 1368 *retval = 0; /* XXX Don't know which value should I return. */ 1369 break; 1370 1371 default: 1372 error = EINVAL; 1373 } 1374 1375 return error; 1376 } 1377 1378 /* --------------------------------------------------------------------- */ 1379 1380 int 1381 tmpfs_advlock(void *v) 1382 { 1383 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1384 1385 struct tmpfs_node *node; 1386 1387 node = VP_TO_TMPFS_NODE(vp); 1388 1389 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1390 } 1391 1392 /* --------------------------------------------------------------------- */ 1393 1394 int 1395 tmpfs_getpages(void *v) 1396 { 1397 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1398 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1399 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1400 int *count = ((struct vop_getpages_args *)v)->a_count; 1401 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1402 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1403 int advice = ((struct vop_getpages_args *)v)->a_advice; 1404 int flags = ((struct vop_getpages_args *)v)->a_flags; 1405 1406 int error; 1407 int i; 1408 struct tmpfs_node *node; 1409 struct uvm_object *uobj; 1410 int npages = *count; 1411 1412 KASSERT(vp->v_type == VREG); 1413 KASSERT(mutex_owned(&vp->v_interlock)); 1414 1415 node = VP_TO_TMPFS_NODE(vp); 1416 uobj = node->tn_spec.tn_reg.tn_aobj; 1417 1418 /* We currently don't rely on PGO_PASTEOF. */ 1419 1420 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1421 if ((flags & PGO_LOCKED) == 0) 1422 mutex_exit(&vp->v_interlock); 1423 return EINVAL; 1424 } 1425 1426 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1427 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1428 } 1429 1430 if ((flags & PGO_LOCKED) != 0) 1431 return EBUSY; 1432 1433 if ((flags & PGO_NOTIMESTAMP) == 0) { 1434 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1435 node->tn_status |= TMPFS_NODE_ACCESSED; 1436 1437 if ((access_type & VM_PROT_WRITE) != 0) 1438 node->tn_status |= TMPFS_NODE_MODIFIED; 1439 } 1440 1441 mutex_exit(&vp->v_interlock); 1442 1443 /* 1444 * Make sure that the array on which we will store the 1445 * gotten pages is clean. Otherwise uao_get (pointed to by 1446 * the pgo_get below) gets confused and does not return the 1447 * appropriate pages. 1448 * 1449 * XXX This shall be revisited when kern/32166 is addressed 1450 * because the loop to clean m[i] will most likely be redundant 1451 * as well as the PGO_ALLPAGES flag. 1452 */ 1453 if (m != NULL) 1454 for (i = 0; i < npages; i++) 1455 m[i] = NULL; 1456 mutex_enter(&uobj->vmobjlock); 1457 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1458 access_type, advice, flags | PGO_ALLPAGES); 1459 #if defined(DEBUG) 1460 { 1461 /* Make sure that all the pages we return are valid. */ 1462 int dbgi; 1463 if (error == 0 && m != NULL) 1464 for (dbgi = 0; dbgi < npages; dbgi++) 1465 KASSERT(m[dbgi] != NULL); 1466 } 1467 #endif 1468 1469 return error; 1470 } 1471 1472 /* --------------------------------------------------------------------- */ 1473 1474 int 1475 tmpfs_putpages(void *v) 1476 { 1477 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1478 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1479 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1480 int flags = ((struct vop_putpages_args *)v)->a_flags; 1481 1482 int error; 1483 struct tmpfs_node *node; 1484 struct uvm_object *uobj; 1485 1486 KASSERT(mutex_owned(&vp->v_interlock)); 1487 1488 node = VP_TO_TMPFS_NODE(vp); 1489 1490 if (vp->v_type != VREG) { 1491 mutex_exit(&vp->v_interlock); 1492 return 0; 1493 } 1494 1495 uobj = node->tn_spec.tn_reg.tn_aobj; 1496 mutex_exit(&vp->v_interlock); 1497 1498 mutex_enter(&uobj->vmobjlock); 1499 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1500 1501 /* XXX mtime */ 1502 1503 return error; 1504 } 1505