tmpfs_vnops.c revision 1.6
1 /* $NetBSD: tmpfs_vnops.c,v 1.6 2005/09/13 14:29:18 yamt 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * tmpfs vnode interface. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.6 2005/09/13 14:29:18 yamt Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/dirent.h> 48 #include <sys/fcntl.h> 49 #include <sys/event.h> 50 #include <sys/malloc.h> 51 #include <sys/namei.h> 52 #include <sys/proc.h> 53 #include <sys/stat.h> 54 #include <sys/uio.h> 55 #include <sys/unistd.h> 56 #include <sys/vnode.h> 57 58 #include <uvm/uvm.h> 59 60 #include <miscfs/fifofs/fifo.h> 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 /* --------------------------------------------------------------------- */ 65 66 /* 67 * vnode operations vector used for files stored in a tmpfs file system. 68 */ 69 int (**tmpfs_vnodeop_p)(void *); 70 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 71 { &vop_default_desc, vn_default_error }, 72 { &vop_lookup_desc, tmpfs_lookup }, 73 { &vop_create_desc, tmpfs_create }, 74 { &vop_mknod_desc, tmpfs_mknod }, 75 { &vop_open_desc, tmpfs_open }, 76 { &vop_close_desc, tmpfs_close }, 77 { &vop_access_desc, tmpfs_access }, 78 { &vop_getattr_desc, tmpfs_getattr }, 79 { &vop_setattr_desc, tmpfs_setattr }, 80 { &vop_read_desc, tmpfs_read }, 81 { &vop_write_desc, tmpfs_write }, 82 { &vop_ioctl_desc, tmpfs_ioctl }, 83 { &vop_fcntl_desc, tmpfs_fcntl }, 84 { &vop_poll_desc, tmpfs_poll }, 85 { &vop_kqfilter_desc, tmpfs_kqfilter }, 86 { &vop_revoke_desc, tmpfs_revoke }, 87 { &vop_mmap_desc, tmpfs_mmap }, 88 { &vop_fsync_desc, tmpfs_fsync }, 89 { &vop_seek_desc, tmpfs_seek }, 90 { &vop_remove_desc, tmpfs_remove }, 91 { &vop_link_desc, tmpfs_link }, 92 { &vop_rename_desc, tmpfs_rename }, 93 { &vop_mkdir_desc, tmpfs_mkdir }, 94 { &vop_rmdir_desc, tmpfs_rmdir }, 95 { &vop_symlink_desc, tmpfs_symlink }, 96 { &vop_readdir_desc, tmpfs_readdir }, 97 { &vop_readlink_desc, tmpfs_readlink }, 98 { &vop_abortop_desc, tmpfs_abortop }, 99 { &vop_inactive_desc, tmpfs_inactive }, 100 { &vop_reclaim_desc, tmpfs_reclaim }, 101 { &vop_lock_desc, tmpfs_lock }, 102 { &vop_unlock_desc, tmpfs_unlock }, 103 { &vop_bmap_desc, tmpfs_bmap }, 104 { &vop_strategy_desc, tmpfs_strategy }, 105 { &vop_print_desc, tmpfs_print }, 106 { &vop_pathconf_desc, tmpfs_pathconf }, 107 { &vop_islocked_desc, tmpfs_islocked }, 108 { &vop_advlock_desc, tmpfs_advlock }, 109 { &vop_blkatoff_desc, tmpfs_blkatoff }, 110 { &vop_valloc_desc, tmpfs_valloc }, 111 { &vop_reallocblks_desc, tmpfs_reallocblks }, 112 { &vop_vfree_desc, tmpfs_vfree }, 113 { &vop_truncate_desc, tmpfs_truncate }, 114 { &vop_update_desc, tmpfs_update }, 115 { &vop_lease_desc, tmpfs_lease }, 116 { &vop_bwrite_desc, tmpfs_bwrite }, 117 { &vop_getpages_desc, tmpfs_getpages }, 118 { &vop_putpages_desc, tmpfs_putpages }, 119 { NULL, NULL } 120 }; 121 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 122 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 123 124 /* --------------------------------------------------------------------- */ 125 126 int 127 tmpfs_lookup(void *v) 128 { 129 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 130 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 131 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 132 133 int error; 134 struct tmpfs_dirent *de; 135 struct tmpfs_node *dnode; 136 137 KASSERT(VOP_ISLOCKED(dvp)); 138 139 dnode = VP_TO_TMPFS_DIR(dvp); 140 *vpp = NULL; 141 142 /* Check accessibility of requested node as a first step. */ 143 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc); 144 if (error != 0) 145 goto out; 146 147 /* If requesting the last path component on a read-only file system 148 * with a write operation, deny it. */ 149 if ((cnp->cn_flags & ISLASTCN) && 150 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 151 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 152 error = EROFS; 153 goto out; 154 } 155 156 /* Avoid doing a linear scan of the directory if the requested 157 * directory/name couple is already in the cache. */ 158 error = cache_lookup(dvp, vpp, cnp); 159 if (error >= 0) 160 goto out; 161 162 /* We cannot be requesting the parent directory of the root node. */ 163 KASSERT(IMPLIES(dnode->tn_type == VDIR && 164 dnode->tn_parent == dnode, !(cnp->cn_flags & ISDOTDOT))); 165 166 if (cnp->cn_flags & ISDOTDOT) { 167 VOP_UNLOCK(dvp, 0); 168 169 /* Allocate a new vnode on the matching entry. */ 170 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_parent, vpp); 171 172 if (cnp->cn_flags & LOCKPARENT && 173 cnp->cn_flags & ISLASTCN) { 174 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 175 cnp->cn_flags |= PDIRUNLOCK; 176 } 177 dnode->tn_parent->tn_lookup_dirent = NULL; 178 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 179 VREF(dvp); 180 *vpp = dvp; 181 dnode->tn_lookup_dirent = NULL; 182 error = 0; 183 } else { 184 de = tmpfs_dir_lookup(dnode, cnp); 185 if (de == NULL) { 186 /* The entry was not found in the directory. 187 * This is OK iff we are creating or renaming an 188 * entry and are working on the last component of 189 * the path name. */ 190 if ((cnp->cn_flags & ISLASTCN) && 191 (cnp->cn_nameiop == CREATE || \ 192 cnp->cn_nameiop == RENAME)) { 193 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 194 cnp->cn_proc); 195 if (error != 0) 196 goto out; 197 198 /* Keep the component name in the buffer for 199 * future uses. */ 200 cnp->cn_flags |= SAVENAME; 201 202 error = EJUSTRETURN; 203 } else 204 error = ENOENT; 205 } else { 206 struct tmpfs_node *tnode; 207 208 /* The entry was found, so get its associated 209 * tmpfs_node. */ 210 tnode = de->td_node; 211 212 /* If we are not at the last path component and 213 * found a non-directory entry, raise an error. */ 214 if ((tnode->tn_type != VDIR) && 215 !(cnp->cn_flags & ISLASTCN)) { 216 error = ENOTDIR; 217 goto out; 218 } 219 220 /* If we are deleting or renaming the entry, keep 221 * track of its tmpfs_dirent so that it can be 222 * easily deleted later. */ 223 if ((cnp->cn_flags & ISLASTCN) && 224 (cnp->cn_nameiop == DELETE || 225 cnp->cn_nameiop == RENAME)) { 226 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 227 cnp->cn_proc); 228 if (error != 0) 229 goto out; 230 /* TODO: Check sticky bit. */ 231 tnode->tn_lookup_dirent = de; 232 } 233 234 /* Allocate a new vnode on the matching entry. */ 235 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 236 237 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 238 !(cnp->cn_flags & ISLASTCN))) 239 VOP_UNLOCK(dvp, 0); 240 } 241 } 242 243 /* Store the result of this lookup in the cache. Avoid this if the 244 * request was for creation, as it does not improve timings on 245 * emprical tests. */ 246 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 247 cache_enter(dvp, *vpp, cnp); 248 249 out: 250 /* If there were no errors, *vpp cannot be null and it must be 251 * locked. */ 252 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 253 254 /* dvp has to be locked if: 255 * - There were errors and relocking of dvp did not fail. 256 * - We are doing a '..' lookup, relocking of dvp did not fail 257 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 258 * - LOCKPARENT and ISLASTCN are set. */ 259 KASSERT(IMPLIES( 260 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 261 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 262 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 263 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 264 , 265 VOP_ISLOCKED(dvp))); 266 267 return error; 268 } 269 270 /* --------------------------------------------------------------------- */ 271 272 int 273 tmpfs_create(void *v) 274 { 275 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 276 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 277 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 278 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 279 280 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 281 282 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 283 } 284 /* --------------------------------------------------------------------- */ 285 286 int 287 tmpfs_mknod(void *v) 288 { 289 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 290 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 291 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 292 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 293 294 if (vap->va_type != VBLK && vap->va_type != VCHR && 295 vap->va_type != VFIFO) 296 return EINVAL; 297 298 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 299 } 300 301 /* --------------------------------------------------------------------- */ 302 303 int 304 tmpfs_open(void *v) 305 { 306 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 307 int mode = ((struct vop_open_args *)v)->a_mode; 308 309 int error; 310 struct tmpfs_node *node; 311 312 KASSERT(VOP_ISLOCKED(vp)); 313 314 node = VP_TO_TMPFS_NODE(vp); 315 KASSERT(node->tn_links > 0); 316 317 /* If the file is marked append-only, deny write requests. */ 318 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 319 error = EPERM; 320 else 321 error = 0; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 return error; 326 } 327 328 /* --------------------------------------------------------------------- */ 329 330 int 331 tmpfs_close(void *v) 332 { 333 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 334 335 int error; 336 struct tmpfs_node *node; 337 338 KASSERT(VOP_ISLOCKED(vp)); 339 340 node = VP_TO_TMPFS_NODE(vp); 341 342 if (node->tn_links > 0) { 343 /* Update node times. No need to do it if the node has 344 * been deleted, because it will vanish after we return. */ 345 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_CLOSE); 346 } else 347 error = 0; 348 349 return error; 350 } 351 352 /* --------------------------------------------------------------------- */ 353 354 int 355 tmpfs_access(void *v) 356 { 357 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 358 int mode = ((struct vop_access_args *)v)->a_mode; 359 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 360 361 int error; 362 struct tmpfs_node *node; 363 364 KASSERT(VOP_ISLOCKED(vp)); 365 366 node = VP_TO_TMPFS_NODE(vp); 367 368 switch (vp->v_type) { 369 case VDIR: 370 /* FALLTHROUGH */ 371 case VLNK: 372 /* FALLTHROUGH */ 373 case VREG: 374 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 375 error = EROFS; 376 goto out; 377 } 378 break; 379 380 case VBLK: 381 /* FALLTHROUGH */ 382 case VCHR: 383 /* FALLTHROUGH */ 384 case VSOCK: 385 /* FALLTHROUGH */ 386 case VFIFO: 387 break; 388 389 default: 390 error = EINVAL; 391 goto out; 392 } 393 394 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 395 error = EPERM; 396 goto out; 397 } 398 399 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 400 node->tn_gid, mode, cred); 401 402 out: 403 KASSERT(VOP_ISLOCKED(vp)); 404 405 return error; 406 } 407 408 /* --------------------------------------------------------------------- */ 409 410 int 411 tmpfs_getattr(void *v) 412 { 413 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 414 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 415 416 struct tmpfs_node *node; 417 418 node = VP_TO_TMPFS_NODE(vp); 419 420 VATTR_NULL(vap); 421 422 vap->va_type = vp->v_type; 423 vap->va_mode = node->tn_mode; 424 vap->va_nlink = node->tn_links; 425 vap->va_uid = node->tn_uid; 426 vap->va_gid = node->tn_gid; 427 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 428 vap->va_fileid = node->tn_id; 429 vap->va_size = node->tn_size; 430 vap->va_blocksize = PAGE_SIZE; 431 vap->va_atime = node->tn_atime; 432 vap->va_mtime = node->tn_mtime; 433 vap->va_ctime = node->tn_ctime; 434 vap->va_birthtime = node->tn_birthtime; 435 vap->va_gen = node->tn_gen; 436 vap->va_flags = node->tn_flags; 437 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 438 node->tn_rdev : VNOVAL; 439 vap->va_bytes = round_page(node->tn_size); 440 vap->va_filerev = VNOVAL; 441 vap->va_vaflags = 0; 442 vap->va_spare = VNOVAL; /* XXX */ 443 444 return 0; 445 } 446 447 /* --------------------------------------------------------------------- */ 448 449 /* XXX Should this operation be atomic? I think it should, but code in 450 * XXX other places (e.g., ufs) doesn't seem to be... */ 451 int 452 tmpfs_setattr(void *v) 453 { 454 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 455 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 456 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 457 struct proc *p = ((struct vop_setattr_args *)v)->a_p; 458 459 int error, error2; 460 461 KASSERT(VOP_ISLOCKED(vp)); 462 463 error = 0; 464 465 /* Abort if any unsettable attribute is given. */ 466 if (vap->va_type != VNON || 467 vap->va_nlink != VNOVAL || 468 vap->va_fsid != VNOVAL || 469 vap->va_fileid != VNOVAL || 470 vap->va_blocksize != VNOVAL || 471 vap->va_ctime.tv_sec != VNOVAL || 472 vap->va_ctime.tv_nsec != VNOVAL || 473 vap->va_birthtime.tv_sec != VNOVAL || 474 vap->va_birthtime.tv_nsec != VNOVAL || 475 vap->va_gen != VNOVAL || 476 vap->va_rdev != VNOVAL || 477 vap->va_bytes != VNOVAL) 478 error = EINVAL; 479 480 if (error == 0 && (vap->va_flags != VNOVAL)) 481 error = tmpfs_chflags(vp, vap->va_flags, cred, p); 482 483 if (error == 0 && (vap->va_size != VNOVAL)) 484 error = tmpfs_chsize(vp, vap->va_size, cred, p); 485 486 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 487 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 488 489 if (error == 0 && (vap->va_mode != VNOVAL)) 490 error = tmpfs_chmod(vp, vap->va_mode, cred, p); 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, p); 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 error2 = VOP_UPDATE(vp, NULL, NULL, 0); 503 if (error == 0) 504 error = error2; 505 506 KASSERT(VOP_ISLOCKED(vp)); 507 508 return error; 509 } 510 511 /* --------------------------------------------------------------------- */ 512 513 int 514 tmpfs_read(void *v) 515 { 516 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 517 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 518 519 struct tmpfs_node *node; 520 struct uvm_object *uobj; 521 int flags; 522 int error; 523 524 KASSERT(VOP_ISLOCKED(vp)); 525 526 node = VP_TO_TMPFS_NODE(vp); 527 528 if (vp->v_type != VREG) { 529 error = EISDIR; 530 goto out; 531 } 532 533 if (uio->uio_offset < 0) { 534 error = EINVAL; 535 goto out; 536 } 537 538 node->tn_status |= TMPFS_NODE_ACCESSED; 539 540 uobj = node->tn_aobj; 541 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 542 error = 0; 543 while (uio->uio_resid > 0) { 544 vsize_t len; 545 void *win; 546 547 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 548 if (len == 0) { 549 break; 550 } 551 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_READ); 552 error = uiomove(win, len, uio); 553 ubc_release(win, flags); 554 if (error) { 555 break; 556 } 557 } 558 559 out: 560 KASSERT(VOP_ISLOCKED(vp)); 561 562 return error; 563 } 564 565 /* --------------------------------------------------------------------- */ 566 567 int 568 tmpfs_write(void *v) 569 { 570 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 571 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 572 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 573 574 boolean_t extended; 575 int error; 576 off_t oldsize; 577 struct tmpfs_node *node; 578 struct uvm_object *uobj; 579 int flags; 580 581 KASSERT(VOP_ISLOCKED(vp)); 582 583 node = VP_TO_TMPFS_NODE(vp); 584 oldsize = node->tn_size; 585 586 if (uio->uio_offset < 0 || vp->v_type != VREG) { 587 error = EINVAL; 588 goto out; 589 } 590 591 if (uio->uio_resid == 0) { 592 error = 0; 593 goto out; 594 } 595 596 if (ioflag & IO_APPEND) 597 uio->uio_offset = node->tn_size; 598 599 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 600 if (extended) { 601 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 602 if (error != 0) 603 goto out; 604 } 605 606 uobj = node->tn_aobj; 607 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 608 error = 0; 609 while (uio->uio_resid > 0) { 610 vsize_t len; 611 void *win; 612 613 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 614 if (len == 0) { 615 break; 616 } 617 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_WRITE); 618 error = uiomove(win, len, uio); 619 ubc_release(win, flags); 620 if (error) { 621 break; 622 } 623 } 624 625 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 626 (extended ? TMPFS_NODE_CHANGED : 0); 627 628 if (error) { 629 (void)tmpfs_reg_resize(vp, oldsize); 630 } 631 632 out: 633 KASSERT(VOP_ISLOCKED(vp)); 634 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 635 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 636 637 return error; 638 } 639 640 /* --------------------------------------------------------------------- */ 641 642 int 643 tmpfs_fsync(void *v) 644 { 645 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 646 647 KASSERT(VOP_ISLOCKED(vp)); 648 649 return VOP_UPDATE(vp, NULL, NULL, 0); 650 } 651 652 /* --------------------------------------------------------------------- */ 653 654 int 655 tmpfs_remove(void *v) 656 { 657 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 658 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 659 660 int error; 661 struct tmpfs_dirent *de; 662 struct tmpfs_mount *tmp; 663 struct tmpfs_node *dnode; 664 struct tmpfs_node *node; 665 666 KASSERT(VOP_ISLOCKED(dvp)); 667 KASSERT(VOP_ISLOCKED(vp)); 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 /* XXX: Why isn't this done by the caller? */ 676 if (vp->v_type == VDIR) { 677 error = EISDIR; 678 goto out; 679 } 680 681 /* Files marked as immutable or append-only cannot be deleted. */ 682 if (node->tn_flags & (IMMUTABLE | APPEND)) { 683 error = EPERM; 684 goto out; 685 } 686 687 /* Remove the entry from the directory; as it is a file, we do not 688 * have to change the number of hard links of the directory. */ 689 tmpfs_dir_detach(dvp, de); 690 691 /* Notify interested parties about the modification of dvp. 692 * The removal of vp is notified when it is reclaimed. */ 693 VN_KNOTE(dvp, NOTE_WRITE); 694 695 /* Free the directory entry we just deleted. Note that the node 696 * referred by it will not be removed until the vnode is really 697 * reclaimed. */ 698 tmpfs_free_dirent(tmp, de, TRUE); 699 700 error = 0; 701 702 out: 703 vput(dvp); 704 vput(vp); 705 706 KASSERT(!VOP_ISLOCKED(dvp)); 707 708 return error; 709 } 710 711 /* --------------------------------------------------------------------- */ 712 713 int 714 tmpfs_link(void *v) 715 { 716 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 717 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 718 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 719 720 int error; 721 struct tmpfs_dirent *de; 722 struct tmpfs_node *dnode; 723 struct tmpfs_node *node; 724 725 KASSERT(VOP_ISLOCKED(dvp)); 726 KASSERT(!VOP_ISLOCKED(vp)); 727 KASSERT(cnp->cn_flags & HASBUF); 728 KASSERT(dvp != vp); /* XXX When can this be false? */ 729 730 dnode = VP_TO_TMPFS_DIR(dvp); 731 node = VP_TO_TMPFS_NODE(vp); 732 733 /* Lock vp because we will need to run VOP_UPDATE over it, which 734 * needs the vnode to be locked. */ 735 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 736 if (error != 0) 737 goto out; 738 739 /* XXX: Why aren't the following two tests done by the caller? */ 740 741 /* Hard links of directories are forbidden. */ 742 if (vp->v_type == VDIR) { 743 error = EPERM; 744 goto out; 745 } 746 747 /* Cannot create cross-device links. */ 748 if (dvp->v_mount != vp->v_mount) { 749 error = EXDEV; 750 goto out; 751 } 752 753 /* Ensure that we do not overflow the maximum number of links imposed 754 * by the system. */ 755 KASSERT(node->tn_links <= LINK_MAX); 756 if (node->tn_links == LINK_MAX) { 757 error = EMLINK; 758 goto out; 759 } 760 761 /* We cannot create links of files marked immutable or append-only. */ 762 if (node->tn_flags & (IMMUTABLE | APPEND)) { 763 error = EPERM; 764 goto out; 765 } 766 767 /* Allocate a new directory entry to represent the node. */ 768 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 769 cnp->cn_nameptr, cnp->cn_namelen, &de); 770 if (error != 0) 771 goto out; 772 773 /* Insert the new directory entry into the appropriate directory. */ 774 tmpfs_dir_attach(dvp, de); 775 VN_KNOTE(dvp, NOTE_WRITE); 776 777 /* vp link count has changed, so update node times. */ 778 node->tn_status |= TMPFS_NODE_CHANGED; 779 (void)VOP_UPDATE(vp, NULL, NULL, 0); 780 781 error = 0; 782 783 out: 784 if (VOP_ISLOCKED(vp)) 785 VOP_UNLOCK(vp, 0); 786 787 PNBUF_PUT(cnp->cn_pnbuf); 788 789 vput(dvp); 790 791 /* XXX Locking status of dvp does not match manual page. */ 792 KASSERT(!VOP_ISLOCKED(dvp)); 793 KASSERT(!VOP_ISLOCKED(vp)); 794 795 return error; 796 } 797 798 /* --------------------------------------------------------------------- */ 799 800 int 801 tmpfs_rename(void *v) 802 { 803 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 804 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 805 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 806 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 807 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 808 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 809 810 char *newname; 811 int error; 812 struct tmpfs_dirent *de; 813 struct tmpfs_mount *tmp; 814 struct tmpfs_node *fdnode; 815 struct tmpfs_node *fnode; 816 struct tmpfs_node *tdnode; 817 818 KASSERT(VOP_ISLOCKED(tdvp)); 819 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 820 KASSERT(fcnp->cn_flags & HASBUF); 821 KASSERT(tcnp->cn_flags & HASBUF); 822 823 fdnode = VP_TO_TMPFS_DIR(fdvp); 824 fnode = VP_TO_TMPFS_NODE(fvp); 825 de = fnode->tn_lookup_dirent; 826 827 /* Disallow cross-device renames. 828 * XXX Why isn't this done by the caller? */ 829 if (fvp->v_mount != tdvp->v_mount || 830 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 831 error = EXDEV; 832 goto out; 833 } 834 835 tmp = VFS_TO_TMPFS(tdvp->v_mount); 836 tdnode = VP_TO_TMPFS_DIR(tdvp); 837 838 /* If source and target are the same file, there is nothing to do. */ 839 if (fvp == tvp) { 840 error = 0; 841 goto out; 842 } 843 844 /* Avoid manipulating '.' and '..' entries. */ 845 if (de == NULL) { 846 KASSERT(fvp->v_type == VDIR); 847 error = EINVAL; 848 goto out; 849 } 850 KASSERT(de->td_node == fnode); 851 852 /* Ensure that we have enough memory to hold the new name, if it 853 * has to be changed. */ 854 if (fcnp->cn_namelen != tcnp->cn_namelen || 855 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 856 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 857 tcnp->cn_namelen, 0); 858 if (newname == NULL) { 859 error = ENOSPC; 860 goto out; 861 } 862 } else 863 newname = NULL; 864 865 /* If the node is being moved to another directory, we have to do 866 * the move. */ 867 if (fdnode != tdnode) { 868 /* In case we are moving a directory, we have to adjust its 869 * parent to point to the new parent. */ 870 if (de->td_node->tn_type == VDIR) { 871 struct tmpfs_node *n; 872 873 /* Ensure the target directory is not a child of the 874 * directory being moved. Otherwise, we'd end up 875 * with stale nodes. */ 876 n = tdnode; 877 while (n != n->tn_parent) { 878 if (n == fnode) { 879 error = EINVAL; 880 goto out; 881 } 882 n = n->tn_parent; 883 } 884 885 /* Adjust the parent pointer. */ 886 TMPFS_VALIDATE_DIR(fnode); 887 de->td_node->tn_parent = tdnode; 888 889 /* As a result of changing the target of the '..' 890 * entry, the link count of the source and target 891 * directories has to be adjusted. */ 892 fdnode->tn_links--; 893 tdnode->tn_links++; 894 } 895 896 /* Do the move: just remove the entry from the source directory 897 * and insert it into the target one. */ 898 tmpfs_dir_detach(fdvp, de); 899 tmpfs_dir_attach(tdvp, de); 900 901 /* Notify listeners of fdvp about the change in the directory. 902 * We can do it at this point because we aren't touching fdvp 903 * any more below. */ 904 VN_KNOTE(fdvp, NOTE_WRITE); 905 } 906 907 /* If the name has changed, we need to make it effective by changing 908 * it in the directory entry. */ 909 if (newname != NULL) { 910 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 911 KASSERT(tcnp->cn_namelen < 0xffff); 912 913 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 914 de->td_namelen); 915 de->td_namelen = (uint16_t)tcnp->cn_namelen; 916 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 917 de->td_name = newname; 918 919 fnode->tn_status |= TMPFS_NODE_MODIFIED; 920 } 921 922 /* If we are overwriting an entry, we have to remove the old one 923 * from the target directory. */ 924 if (tvp != NULL) { 925 struct tmpfs_node *tnode; 926 927 tnode = VP_TO_TMPFS_NODE(tvp); 928 929 /* The source node cannot be a directory in this case. */ 930 KASSERT(fnode->tn_type != VDIR); 931 932 /* Remove the old entry from the target directory. */ 933 de = tnode->tn_lookup_dirent; 934 tmpfs_dir_detach(tdvp, de); 935 936 /* Free the directory entry we just deleted. Note that the 937 * node referred by it will not be removed until the vnode is 938 * really reclaimed. */ 939 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 940 } 941 942 /* Notify listeners of tdvp about the change in the directory (either 943 * because a new entry was added or because one was removed). */ 944 VN_KNOTE(tdvp, NOTE_WRITE); 945 946 error = 0; 947 948 out: 949 /* Release target nodes. */ 950 /* XXX: I don't understand when tdvp can be the same as tvp, but 951 * other code takes care of this... */ 952 if (tdvp == tvp) 953 vrele(tdvp); 954 else 955 vput(tdvp); 956 if (tvp != NULL) 957 vput(tvp); 958 959 /* Release source nodes. */ 960 vrele(fdvp); 961 vrele(fvp); 962 963 return error; 964 } 965 966 /* --------------------------------------------------------------------- */ 967 968 int 969 tmpfs_mkdir(void *v) 970 { 971 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 972 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 973 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 974 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 975 976 KASSERT(vap->va_type == VDIR); 977 978 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 979 } 980 981 /* --------------------------------------------------------------------- */ 982 983 int 984 tmpfs_rmdir(void *v) 985 { 986 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 987 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 988 989 int error; 990 struct tmpfs_dirent *de; 991 struct tmpfs_mount *tmp; 992 struct tmpfs_node *dnode; 993 struct tmpfs_node *node; 994 995 KASSERT(VOP_ISLOCKED(dvp)); 996 KASSERT(VOP_ISLOCKED(vp)); 997 998 tmp = VFS_TO_TMPFS(dvp->v_mount); 999 dnode = VP_TO_TMPFS_DIR(dvp); 1000 node = VP_TO_TMPFS_DIR(vp); 1001 KASSERT(node->tn_parent == dnode); 1002 1003 /* Get the directory entry associated with node (vp). This was 1004 * filled by tmpfs_lookup while looking up the entry. */ 1005 de = node->tn_lookup_dirent; 1006 KASSERT(TMPFS_DIRENT_MATCHES(de, 1007 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1008 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1009 1010 /* Directories with more than two entries ('.' and '..') cannot be 1011 * removed. */ 1012 if (node->tn_size > 0) { 1013 error = ENOTEMPTY; 1014 goto out; 1015 } 1016 1017 /* Check flags to see if we are allowed to remove the directory. */ 1018 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1019 error = EPERM; 1020 goto out; 1021 } 1022 1023 /* Detach the directory entry from the directory (dnode). */ 1024 tmpfs_dir_detach(dvp, de); 1025 1026 node->tn_links--; 1027 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1028 TMPFS_NODE_MODIFIED; 1029 node->tn_parent->tn_links--; 1030 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1031 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1032 1033 /* Notify modification of parent directory and release it. */ 1034 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1035 cache_purge(dvp); /* XXX Is this needed? */ 1036 vput(dvp); 1037 1038 /* Free the directory entry we just deleted. Note that the node 1039 * referred by it will not be removed until the vnode is really 1040 * reclaimed. */ 1041 tmpfs_free_dirent(tmp, de, TRUE); 1042 1043 /* Release the deleted vnode (will destroy the node, notify 1044 * interested parties and clean it from the cache). */ 1045 vput(vp); 1046 1047 /* As the directory has been modified, invalidate readdir cached 1048 * values. */ 1049 dnode->tn_readdir_lastn = 0; 1050 dnode->tn_readdir_lastp = NULL; 1051 1052 error = 0; 1053 1054 out: 1055 if (error != 0) { 1056 vput(dvp); 1057 vput(vp); 1058 } 1059 1060 return error; 1061 } 1062 1063 /* --------------------------------------------------------------------- */ 1064 1065 int 1066 tmpfs_symlink(void *v) 1067 { 1068 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1069 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1070 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1071 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1072 char *target = ((struct vop_symlink_args *)v)->a_target; 1073 1074 KASSERT(vap->va_type == VLNK); 1075 1076 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1077 } 1078 1079 /* --------------------------------------------------------------------- */ 1080 1081 int 1082 tmpfs_readdir(void *v) 1083 { 1084 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1085 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1086 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1087 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1088 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1089 1090 int error; 1091 off_t realsize, startoff; 1092 struct tmpfs_node *node; 1093 1094 KASSERT(VOP_ISLOCKED(vp)); 1095 1096 /* This operation only makes sense on directory nodes. */ 1097 if (vp->v_type != VDIR) { 1098 error = ENOTDIR; 1099 goto out; 1100 } 1101 1102 node = VP_TO_TMPFS_DIR(vp); 1103 realsize = node->tn_size + sizeof(struct tmpfs_dirent) * 2; 1104 1105 /* The offset cannot extend past the end of the directory. */ 1106 if (uio->uio_offset >= realsize) { 1107 error = EINVAL; 1108 goto out; 1109 } 1110 1111 /* The offset must be correctly aligned at the begining of 1112 * tmpfs_dirent structures. */ 1113 if (uio->uio_offset % sizeof(struct tmpfs_dirent) > 0) { 1114 error = EINVAL; 1115 goto out; 1116 } 1117 1118 startoff = uio->uio_offset; 1119 1120 if (uio->uio_offset == 0) { 1121 error = tmpfs_dir_getdotdent(node, uio); 1122 if (error == -1) { 1123 error = 0; 1124 goto outok; 1125 } else if (error != 0) 1126 goto outok; 1127 } 1128 1129 if (uio->uio_offset == sizeof(struct tmpfs_dirent)) { 1130 error = tmpfs_dir_getdotdotdent(node, uio); 1131 if (error == -1) { 1132 error = 0; 1133 goto outok; 1134 } else if (error != 0) 1135 goto outok; 1136 } 1137 1138 if (uio->uio_offset == realsize) { 1139 error = 0; 1140 goto outok; 1141 } 1142 KASSERT(uio->uio_offset < realsize); 1143 1144 error = tmpfs_dir_getdents(node, uio); 1145 if (error == -1) 1146 error = 0; 1147 KASSERT(error >= 0); 1148 1149 outok: 1150 /* This label assumes that startoff, node and realsize have been 1151 * initialized. If the compiler didn't spit out warnings, we'd 1152 * simply make this one be 'out' and drop 'outok'. */ 1153 1154 if (eofflag != NULL) 1155 *eofflag = 1156 (error == 0 && uio->uio_offset == realsize); 1157 1158 /* Update NFS-related variables. */ 1159 if (error == 0 && cookies != NULL && ncookies != NULL) { 1160 long cnt, startcnt; 1161 off_t i; 1162 1163 startcnt = startoff / sizeof(struct tmpfs_dirent); 1164 cnt = uio->uio_offset / sizeof(struct tmpfs_dirent); 1165 *ncookies = cnt - startcnt; 1166 *cookies = (off_t *)malloc((*ncookies) * sizeof(off_t), 1167 M_TEMP, M_WAITOK); 1168 1169 for (i = 0; i < *ncookies; i++) 1170 (*cookies)[i] = (startcnt + i + 1) * 1171 sizeof(struct tmpfs_dirent); 1172 } 1173 1174 out: 1175 KASSERT(VOP_ISLOCKED(vp)); 1176 1177 return error; 1178 } 1179 1180 /* --------------------------------------------------------------------- */ 1181 1182 int 1183 tmpfs_readlink(void *v) 1184 { 1185 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1186 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1187 1188 int error; 1189 struct tmpfs_node *node; 1190 1191 KASSERT(VOP_ISLOCKED(vp)); 1192 KASSERT(uio->uio_offset == 0); 1193 KASSERT(vp->v_type == VLNK); 1194 1195 node = VP_TO_TMPFS_NODE(vp); 1196 1197 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1198 uio); 1199 node->tn_status |= TMPFS_NODE_ACCESSED; 1200 1201 KASSERT(VOP_ISLOCKED(vp)); 1202 1203 return error; 1204 } 1205 1206 /* --------------------------------------------------------------------- */ 1207 1208 int 1209 tmpfs_inactive(void *v) 1210 { 1211 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1212 struct proc *p = ((struct vop_inactive_args *)v)->a_p; 1213 1214 struct tmpfs_node *node; 1215 1216 KASSERT(VOP_ISLOCKED(vp)); 1217 1218 node = VP_TO_TMPFS_NODE(vp); 1219 1220 VOP_UNLOCK(vp, 0); 1221 1222 if (node->tn_links == 0) 1223 vrecycle(vp, NULL, p); 1224 1225 return 0; 1226 } 1227 1228 /* --------------------------------------------------------------------- */ 1229 1230 int 1231 tmpfs_reclaim(void *v) 1232 { 1233 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1234 1235 struct tmpfs_mount *tmp; 1236 struct tmpfs_node *node; 1237 1238 KASSERT(!VOP_ISLOCKED(vp)); 1239 1240 node = VP_TO_TMPFS_NODE(vp); 1241 tmp = VFS_TO_TMPFS(vp->v_mount); 1242 1243 if (node->tn_links == 0) 1244 VN_KNOTE(vp, NOTE_DELETE); 1245 1246 cache_purge(vp); 1247 tmpfs_free_vp(vp); 1248 1249 /* If the node referenced by this vnode was deleted by the user, 1250 * we must free its associated data structures (now that the vnode 1251 * is being reclaimed). */ 1252 if (node->tn_links == 0) 1253 tmpfs_free_node(tmp, node); 1254 1255 KASSERT(!VOP_ISLOCKED(vp)); 1256 KASSERT(vp->v_data == NULL); 1257 1258 return 0; 1259 } 1260 1261 /* --------------------------------------------------------------------- */ 1262 1263 int 1264 tmpfs_print(void *v) 1265 { 1266 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1267 1268 struct tmpfs_node *node; 1269 1270 node = VP_TO_TMPFS_NODE(vp); 1271 1272 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1273 node, node->tn_flags, node->tn_links); 1274 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1275 ", status 0x%x\n", 1276 node->tn_mode, node->tn_uid, node->tn_gid, 1277 (uintmax_t)node->tn_size, node->tn_status); 1278 1279 if (vp->v_type == VFIFO) 1280 fifo_printinfo(vp); 1281 lockmgr_printinfo(&vp->v_lock); 1282 1283 printf("\n"); 1284 1285 return 0; 1286 } 1287 1288 /* --------------------------------------------------------------------- */ 1289 1290 int 1291 tmpfs_pathconf(void *v) 1292 { 1293 int name = ((struct vop_pathconf_args *)v)->a_name; 1294 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1295 1296 int error; 1297 1298 error = 0; 1299 1300 switch (name) { 1301 case _PC_LINK_MAX: 1302 *retval = LINK_MAX; 1303 break; 1304 1305 case _PC_NAME_MAX: 1306 *retval = NAME_MAX; 1307 break; 1308 1309 case _PC_PATH_MAX: 1310 *retval = PATH_MAX; 1311 break; 1312 1313 case _PC_PIPE_BUF: 1314 *retval = PIPE_BUF; 1315 break; 1316 1317 case _PC_CHOWN_RESTRICTED: 1318 *retval = 1; 1319 break; 1320 1321 case _PC_NO_TRUNC: 1322 *retval = 1; 1323 break; 1324 1325 case _PC_SYNC_IO: 1326 *retval = 1; 1327 break; 1328 1329 case _PC_FILESIZEBITS: 1330 *retval = 0; /* XXX Don't know which value should I return. */ 1331 break; 1332 1333 default: 1334 error = EINVAL; 1335 } 1336 1337 return error; 1338 } 1339 1340 /* --------------------------------------------------------------------- */ 1341 1342 int 1343 tmpfs_truncate(void *v) 1344 { 1345 struct vnode *vp = ((struct vop_truncate_args *)v)->a_vp; 1346 off_t length = ((struct vop_truncate_args *)v)->a_length; 1347 1348 boolean_t extended; 1349 int error; 1350 struct tmpfs_node *node; 1351 1352 node = VP_TO_TMPFS_NODE(vp); 1353 extended = length > node->tn_size; 1354 1355 if (length < 0) { 1356 error = EINVAL; 1357 goto out; 1358 } 1359 1360 if (node->tn_size == length) { 1361 error = 0; 1362 goto out; 1363 } 1364 1365 error = tmpfs_reg_resize(vp, length); 1366 if (error == 0) { 1367 VN_KNOTE(vp, NOTE_ATTRIB | (extended ? NOTE_EXTEND : 0)); 1368 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1369 } 1370 1371 out: 1372 (void)VOP_UPDATE(vp, NULL, NULL, 0); 1373 1374 return error; 1375 } 1376 1377 /* --------------------------------------------------------------------- */ 1378 1379 int 1380 tmpfs_update(void *v) 1381 { 1382 struct vnode *vp = ((struct vop_update_args *)v)->a_vp; 1383 struct timespec *acc = ((struct vop_update_args *)v)->a_access; 1384 struct timespec *mod = ((struct vop_update_args *)v)->a_modify; 1385 int flags = ((struct vop_update_args *)v)->a_flags; 1386 1387 struct timespec *ts = NULL, tsb; 1388 struct tmpfs_node *node; 1389 1390 KASSERT(VOP_ISLOCKED(vp)); 1391 1392 node = VP_TO_TMPFS_NODE(vp); 1393 1394 if (flags & UPDATE_CLOSE) 1395 ; /* XXX Need to do anything special? */ 1396 1397 if (node->tn_status != 0) { 1398 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1399 if (acc == NULL) 1400 acc = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1401 node->tn_atime = *acc; 1402 } 1403 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1404 if (mod == NULL) 1405 mod = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1406 node->tn_mtime = *mod; 1407 } 1408 if (node->tn_status & TMPFS_NODE_CHANGED) { 1409 if (ts == NULL) 1410 ts = nanotime(&tsb); 1411 node->tn_ctime = *ts; 1412 } 1413 node->tn_status &= 1414 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1415 TMPFS_NODE_CHANGED); 1416 } 1417 1418 KASSERT(VOP_ISLOCKED(vp)); 1419 1420 return 0; 1421 } 1422 1423 /* --------------------------------------------------------------------- */ 1424 1425 int 1426 tmpfs_getpages(void *v) 1427 { 1428 const struct vop_getpages_args *ap = v; 1429 struct vnode *vp = ap->a_vp; 1430 voff_t offset = ap->a_offset; 1431 vm_prot_t access_type = ap->a_access_type; 1432 int flags = ap->a_flags; 1433 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1434 struct uvm_object *uobj; 1435 int error; 1436 1437 KASSERT(vp->v_type == VREG); 1438 1439 uobj = node->tn_aobj; 1440 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1441 1442 if ((flags & PGO_LOCKED) != 0) { 1443 return EBUSY; 1444 } 1445 1446 if ((flags & PGO_NOTIMESTAMP) == 0) { 1447 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) { 1448 node->tn_status |= TMPFS_NODE_ACCESSED; 1449 } 1450 if ((access_type & VM_PROT_WRITE) != 0) { 1451 node->tn_status |= TMPFS_NODE_MODIFIED; 1452 } 1453 } 1454 1455 simple_unlock(&vp->v_interlock); 1456 1457 simple_lock(&uobj->vmobjlock); 1458 error = (*uobj->pgops->pgo_get)(uobj, offset, ap->a_m, ap->a_count, 1459 ap->a_centeridx, access_type, ap->a_advice, flags); 1460 1461 return error; 1462 } 1463 1464 /* --------------------------------------------------------------------- */ 1465 1466 int 1467 tmpfs_putpages(void *v) 1468 { 1469 const struct vop_putpages_args *ap = v; 1470 struct vnode *vp = ap->a_vp; 1471 int flags = ap->a_flags; 1472 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1473 struct uvm_object *uobj; 1474 int error; 1475 1476 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1477 1478 if (vp->v_type != VREG) { 1479 simple_unlock(&vp->v_interlock); 1480 return 0; 1481 } 1482 1483 uobj = node->tn_aobj; 1484 simple_unlock(&vp->v_interlock); 1485 1486 simple_lock(&uobj->vmobjlock); 1487 error = (*uobj->pgops->pgo_put)(uobj, ap->a_offlo, ap->a_offhi, flags); 1488 1489 /* XXX mtime */ 1490 1491 return error; 1492 } 1493
Indexes created Tue Sep 23 07:09:52 GMT 2025