tmpfs_vnops.c revision 1.8
1 /* $NetBSD: tmpfs_vnops.c,v 1.8 2005/09/14 10:40:49 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 1.8 2005/09/14 10:40:49 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 int error; 520 int flags; 521 struct tmpfs_node *node; 522 struct uvm_object *uobj; 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 (error == 0 && uio->uio_resid > 0) { 544 vsize_t len; 545 void *win; 546 547 if (node->tn_size <= uio->uio_offset) 548 break; 549 550 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 551 if (len == 0) 552 break; 553 554 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_READ); 555 error = uiomove(win, len, uio); 556 ubc_release(win, flags); 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 int flags; 577 off_t oldsize; 578 struct tmpfs_node *node; 579 struct uvm_object *uobj; 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 (error == 0 && 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 } 621 622 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 623 (extended ? TMPFS_NODE_CHANGED : 0); 624 625 if (error != 0) 626 (void)tmpfs_reg_resize(vp, oldsize); 627 628 out: 629 KASSERT(VOP_ISLOCKED(vp)); 630 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 631 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 632 633 return error; 634 } 635 636 /* --------------------------------------------------------------------- */ 637 638 int 639 tmpfs_fsync(void *v) 640 { 641 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 642 643 KASSERT(VOP_ISLOCKED(vp)); 644 645 return VOP_UPDATE(vp, NULL, NULL, 0); 646 } 647 648 /* --------------------------------------------------------------------- */ 649 650 int 651 tmpfs_remove(void *v) 652 { 653 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 654 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 655 656 int error; 657 struct tmpfs_dirent *de; 658 struct tmpfs_mount *tmp; 659 struct tmpfs_node *dnode; 660 struct tmpfs_node *node; 661 662 KASSERT(VOP_ISLOCKED(dvp)); 663 KASSERT(VOP_ISLOCKED(vp)); 664 665 dnode = VP_TO_TMPFS_DIR(dvp); 666 node = VP_TO_TMPFS_NODE(vp); 667 tmp = VFS_TO_TMPFS(vp->v_mount); 668 de = node->tn_lookup_dirent; 669 KASSERT(de != NULL); 670 671 /* XXX: Why isn't this done by the caller? */ 672 if (vp->v_type == VDIR) { 673 error = EISDIR; 674 goto out; 675 } 676 677 /* Files marked as immutable or append-only cannot be deleted. */ 678 if (node->tn_flags & (IMMUTABLE | APPEND)) { 679 error = EPERM; 680 goto out; 681 } 682 683 /* Remove the entry from the directory; as it is a file, we do not 684 * have to change the number of hard links of the directory. */ 685 tmpfs_dir_detach(dvp, de); 686 687 /* Notify interested parties about the modification of dvp. 688 * The removal of vp is notified when it is reclaimed. */ 689 VN_KNOTE(dvp, NOTE_WRITE); 690 691 /* Free the directory entry we just deleted. Note that the node 692 * referred by it will not be removed until the vnode is really 693 * reclaimed. */ 694 tmpfs_free_dirent(tmp, de, TRUE); 695 696 error = 0; 697 698 out: 699 vput(dvp); 700 vput(vp); 701 702 KASSERT(!VOP_ISLOCKED(dvp)); 703 704 return error; 705 } 706 707 /* --------------------------------------------------------------------- */ 708 709 int 710 tmpfs_link(void *v) 711 { 712 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 713 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 714 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 715 716 int error; 717 struct tmpfs_dirent *de; 718 struct tmpfs_node *dnode; 719 struct tmpfs_node *node; 720 721 KASSERT(VOP_ISLOCKED(dvp)); 722 KASSERT(!VOP_ISLOCKED(vp)); 723 KASSERT(cnp->cn_flags & HASBUF); 724 KASSERT(dvp != vp); /* XXX When can this be false? */ 725 726 dnode = VP_TO_TMPFS_DIR(dvp); 727 node = VP_TO_TMPFS_NODE(vp); 728 729 /* Lock vp because we will need to run VOP_UPDATE over it, which 730 * needs the vnode to be locked. */ 731 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 732 if (error != 0) 733 goto out; 734 735 /* XXX: Why aren't the following two tests done by the caller? */ 736 737 /* Hard links of directories are forbidden. */ 738 if (vp->v_type == VDIR) { 739 error = EPERM; 740 goto out; 741 } 742 743 /* Cannot create cross-device links. */ 744 if (dvp->v_mount != vp->v_mount) { 745 error = EXDEV; 746 goto out; 747 } 748 749 /* Ensure that we do not overflow the maximum number of links imposed 750 * by the system. */ 751 KASSERT(node->tn_links <= LINK_MAX); 752 if (node->tn_links == LINK_MAX) { 753 error = EMLINK; 754 goto out; 755 } 756 757 /* We cannot create links of files marked immutable or append-only. */ 758 if (node->tn_flags & (IMMUTABLE | APPEND)) { 759 error = EPERM; 760 goto out; 761 } 762 763 /* Allocate a new directory entry to represent the node. */ 764 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 765 cnp->cn_nameptr, cnp->cn_namelen, &de); 766 if (error != 0) 767 goto out; 768 769 /* Insert the new directory entry into the appropriate directory. */ 770 tmpfs_dir_attach(dvp, de); 771 VN_KNOTE(dvp, NOTE_WRITE); 772 773 /* vp link count has changed, so update node times. */ 774 node->tn_status |= TMPFS_NODE_CHANGED; 775 (void)VOP_UPDATE(vp, NULL, NULL, 0); 776 777 error = 0; 778 779 out: 780 if (VOP_ISLOCKED(vp)) 781 VOP_UNLOCK(vp, 0); 782 783 PNBUF_PUT(cnp->cn_pnbuf); 784 785 vput(dvp); 786 787 /* XXX Locking status of dvp does not match manual page. */ 788 KASSERT(!VOP_ISLOCKED(dvp)); 789 KASSERT(!VOP_ISLOCKED(vp)); 790 791 return error; 792 } 793 794 /* --------------------------------------------------------------------- */ 795 796 int 797 tmpfs_rename(void *v) 798 { 799 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 800 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 801 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 802 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 803 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 804 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 805 806 char *newname; 807 int error; 808 struct tmpfs_dirent *de; 809 struct tmpfs_mount *tmp; 810 struct tmpfs_node *fdnode; 811 struct tmpfs_node *fnode; 812 struct tmpfs_node *tdnode; 813 814 KASSERT(VOP_ISLOCKED(tdvp)); 815 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 816 KASSERT(fcnp->cn_flags & HASBUF); 817 KASSERT(tcnp->cn_flags & HASBUF); 818 819 fdnode = VP_TO_TMPFS_DIR(fdvp); 820 fnode = VP_TO_TMPFS_NODE(fvp); 821 de = fnode->tn_lookup_dirent; 822 823 /* Disallow cross-device renames. 824 * XXX Why isn't this done by the caller? */ 825 if (fvp->v_mount != tdvp->v_mount || 826 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 827 error = EXDEV; 828 goto out; 829 } 830 831 tmp = VFS_TO_TMPFS(tdvp->v_mount); 832 tdnode = VP_TO_TMPFS_DIR(tdvp); 833 834 /* If source and target are the same file, there is nothing to do. */ 835 if (fvp == tvp) { 836 error = 0; 837 goto out; 838 } 839 840 /* Avoid manipulating '.' and '..' entries. */ 841 if (de == NULL) { 842 KASSERT(fvp->v_type == VDIR); 843 error = EINVAL; 844 goto out; 845 } 846 KASSERT(de->td_node == fnode); 847 848 /* Ensure that we have enough memory to hold the new name, if it 849 * has to be changed. */ 850 if (fcnp->cn_namelen != tcnp->cn_namelen || 851 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 852 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 853 tcnp->cn_namelen, 0); 854 if (newname == NULL) { 855 error = ENOSPC; 856 goto out; 857 } 858 } else 859 newname = NULL; 860 861 /* If the node is being moved to another directory, we have to do 862 * the move. */ 863 if (fdnode != tdnode) { 864 /* In case we are moving a directory, we have to adjust its 865 * parent to point to the new parent. */ 866 if (de->td_node->tn_type == VDIR) { 867 struct tmpfs_node *n; 868 869 /* Ensure the target directory is not a child of the 870 * directory being moved. Otherwise, we'd end up 871 * with stale nodes. */ 872 n = tdnode; 873 while (n != n->tn_parent) { 874 if (n == fnode) { 875 error = EINVAL; 876 goto out; 877 } 878 n = n->tn_parent; 879 } 880 881 /* Adjust the parent pointer. */ 882 TMPFS_VALIDATE_DIR(fnode); 883 de->td_node->tn_parent = tdnode; 884 885 /* As a result of changing the target of the '..' 886 * entry, the link count of the source and target 887 * directories has to be adjusted. */ 888 fdnode->tn_links--; 889 tdnode->tn_links++; 890 } 891 892 /* Do the move: just remove the entry from the source directory 893 * and insert it into the target one. */ 894 tmpfs_dir_detach(fdvp, de); 895 tmpfs_dir_attach(tdvp, de); 896 897 /* Notify listeners of fdvp about the change in the directory. 898 * We can do it at this point because we aren't touching fdvp 899 * any more below. */ 900 VN_KNOTE(fdvp, NOTE_WRITE); 901 } 902 903 /* If the name has changed, we need to make it effective by changing 904 * it in the directory entry. */ 905 if (newname != NULL) { 906 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 907 KASSERT(tcnp->cn_namelen < 0xffff); 908 909 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 910 de->td_namelen); 911 de->td_namelen = (uint16_t)tcnp->cn_namelen; 912 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 913 de->td_name = newname; 914 915 fnode->tn_status |= TMPFS_NODE_MODIFIED; 916 } 917 918 /* If we are overwriting an entry, we have to remove the old one 919 * from the target directory. */ 920 if (tvp != NULL) { 921 struct tmpfs_node *tnode; 922 923 tnode = VP_TO_TMPFS_NODE(tvp); 924 925 /* The source node cannot be a directory in this case. */ 926 KASSERT(fnode->tn_type != VDIR); 927 928 /* Remove the old entry from the target directory. */ 929 de = tnode->tn_lookup_dirent; 930 tmpfs_dir_detach(tdvp, de); 931 932 /* Free the directory entry we just deleted. Note that the 933 * node referred by it will not be removed until the vnode is 934 * really reclaimed. */ 935 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 936 } 937 938 /* Notify listeners of tdvp about the change in the directory (either 939 * because a new entry was added or because one was removed). */ 940 VN_KNOTE(tdvp, NOTE_WRITE); 941 942 error = 0; 943 944 out: 945 /* Release target nodes. */ 946 /* XXX: I don't understand when tdvp can be the same as tvp, but 947 * other code takes care of this... */ 948 if (tdvp == tvp) 949 vrele(tdvp); 950 else 951 vput(tdvp); 952 if (tvp != NULL) 953 vput(tvp); 954 955 /* Release source nodes. */ 956 vrele(fdvp); 957 vrele(fvp); 958 959 return error; 960 } 961 962 /* --------------------------------------------------------------------- */ 963 964 int 965 tmpfs_mkdir(void *v) 966 { 967 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 968 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 969 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 970 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 971 972 KASSERT(vap->va_type == VDIR); 973 974 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 975 } 976 977 /* --------------------------------------------------------------------- */ 978 979 int 980 tmpfs_rmdir(void *v) 981 { 982 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 983 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 984 985 int error; 986 struct tmpfs_dirent *de; 987 struct tmpfs_mount *tmp; 988 struct tmpfs_node *dnode; 989 struct tmpfs_node *node; 990 991 KASSERT(VOP_ISLOCKED(dvp)); 992 KASSERT(VOP_ISLOCKED(vp)); 993 994 tmp = VFS_TO_TMPFS(dvp->v_mount); 995 dnode = VP_TO_TMPFS_DIR(dvp); 996 node = VP_TO_TMPFS_DIR(vp); 997 KASSERT(node->tn_parent == dnode); 998 999 /* Get the directory entry associated with node (vp). This was 1000 * filled by tmpfs_lookup while looking up the entry. */ 1001 de = node->tn_lookup_dirent; 1002 KASSERT(TMPFS_DIRENT_MATCHES(de, 1003 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1004 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1005 1006 /* Directories with more than two entries ('.' and '..') cannot be 1007 * removed. */ 1008 if (node->tn_size > 0) { 1009 error = ENOTEMPTY; 1010 goto out; 1011 } 1012 1013 /* Check flags to see if we are allowed to remove the directory. */ 1014 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1015 error = EPERM; 1016 goto out; 1017 } 1018 1019 /* Detach the directory entry from the directory (dnode). */ 1020 tmpfs_dir_detach(dvp, de); 1021 1022 node->tn_links--; 1023 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1024 TMPFS_NODE_MODIFIED; 1025 node->tn_parent->tn_links--; 1026 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1027 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1028 1029 /* Notify modification of parent directory and release it. */ 1030 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1031 cache_purge(dvp); /* XXX Is this needed? */ 1032 vput(dvp); 1033 1034 /* Free the directory entry we just deleted. Note that the node 1035 * referred by it will not be removed until the vnode is really 1036 * reclaimed. */ 1037 tmpfs_free_dirent(tmp, de, TRUE); 1038 1039 /* Release the deleted vnode (will destroy the node, notify 1040 * interested parties and clean it from the cache). */ 1041 vput(vp); 1042 1043 /* As the directory has been modified, invalidate readdir cached 1044 * values. */ 1045 dnode->tn_readdir_lastn = 0; 1046 dnode->tn_readdir_lastp = NULL; 1047 1048 error = 0; 1049 1050 out: 1051 if (error != 0) { 1052 vput(dvp); 1053 vput(vp); 1054 } 1055 1056 return error; 1057 } 1058 1059 /* --------------------------------------------------------------------- */ 1060 1061 int 1062 tmpfs_symlink(void *v) 1063 { 1064 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1065 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1066 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1067 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1068 char *target = ((struct vop_symlink_args *)v)->a_target; 1069 1070 KASSERT(vap->va_type == VLNK); 1071 1072 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1073 } 1074 1075 /* --------------------------------------------------------------------- */ 1076 1077 int 1078 tmpfs_readdir(void *v) 1079 { 1080 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1081 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1082 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1083 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1084 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1085 1086 int error; 1087 off_t realsize, startoff; 1088 struct tmpfs_node *node; 1089 1090 KASSERT(VOP_ISLOCKED(vp)); 1091 1092 /* This operation only makes sense on directory nodes. */ 1093 if (vp->v_type != VDIR) { 1094 error = ENOTDIR; 1095 goto out; 1096 } 1097 1098 node = VP_TO_TMPFS_DIR(vp); 1099 realsize = node->tn_size + sizeof(struct tmpfs_dirent) * 2; 1100 1101 /* The offset cannot extend past the end of the directory. */ 1102 if (uio->uio_offset >= realsize) { 1103 error = EINVAL; 1104 goto out; 1105 } 1106 1107 /* The offset must be correctly aligned at the begining of 1108 * tmpfs_dirent structures. */ 1109 if (uio->uio_offset % sizeof(struct tmpfs_dirent) > 0) { 1110 error = EINVAL; 1111 goto out; 1112 } 1113 1114 startoff = uio->uio_offset; 1115 1116 if (uio->uio_offset == 0) { 1117 error = tmpfs_dir_getdotdent(node, uio); 1118 if (error == -1) { 1119 error = 0; 1120 goto outok; 1121 } else if (error != 0) 1122 goto outok; 1123 } 1124 1125 if (uio->uio_offset == sizeof(struct tmpfs_dirent)) { 1126 error = tmpfs_dir_getdotdotdent(node, uio); 1127 if (error == -1) { 1128 error = 0; 1129 goto outok; 1130 } else if (error != 0) 1131 goto outok; 1132 } 1133 1134 if (uio->uio_offset == realsize) { 1135 error = 0; 1136 goto outok; 1137 } 1138 KASSERT(uio->uio_offset < realsize); 1139 1140 error = tmpfs_dir_getdents(node, uio); 1141 if (error == -1) 1142 error = 0; 1143 KASSERT(error >= 0); 1144 1145 outok: 1146 /* This label assumes that startoff, node and realsize have been 1147 * initialized. If the compiler didn't spit out warnings, we'd 1148 * simply make this one be 'out' and drop 'outok'. */ 1149 1150 if (eofflag != NULL) 1151 *eofflag = 1152 (error == 0 && uio->uio_offset == realsize); 1153 1154 /* Update NFS-related variables. */ 1155 if (error == 0 && cookies != NULL && ncookies != NULL) { 1156 long cnt, startcnt; 1157 off_t i; 1158 1159 startcnt = startoff / sizeof(struct tmpfs_dirent); 1160 cnt = uio->uio_offset / sizeof(struct tmpfs_dirent); 1161 *ncookies = cnt - startcnt; 1162 *cookies = (off_t *)malloc((*ncookies) * sizeof(off_t), 1163 M_TEMP, M_WAITOK); 1164 1165 for (i = 0; i < *ncookies; i++) 1166 (*cookies)[i] = (startcnt + i + 1) * 1167 sizeof(struct tmpfs_dirent); 1168 } 1169 1170 out: 1171 KASSERT(VOP_ISLOCKED(vp)); 1172 1173 return error; 1174 } 1175 1176 /* --------------------------------------------------------------------- */ 1177 1178 int 1179 tmpfs_readlink(void *v) 1180 { 1181 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1182 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1183 1184 int error; 1185 struct tmpfs_node *node; 1186 1187 KASSERT(VOP_ISLOCKED(vp)); 1188 KASSERT(uio->uio_offset == 0); 1189 KASSERT(vp->v_type == VLNK); 1190 1191 node = VP_TO_TMPFS_NODE(vp); 1192 1193 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1194 uio); 1195 node->tn_status |= TMPFS_NODE_ACCESSED; 1196 1197 KASSERT(VOP_ISLOCKED(vp)); 1198 1199 return error; 1200 } 1201 1202 /* --------------------------------------------------------------------- */ 1203 1204 int 1205 tmpfs_inactive(void *v) 1206 { 1207 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1208 struct proc *p = ((struct vop_inactive_args *)v)->a_p; 1209 1210 struct tmpfs_node *node; 1211 1212 KASSERT(VOP_ISLOCKED(vp)); 1213 1214 node = VP_TO_TMPFS_NODE(vp); 1215 1216 VOP_UNLOCK(vp, 0); 1217 1218 if (node->tn_links == 0) 1219 vrecycle(vp, NULL, p); 1220 1221 return 0; 1222 } 1223 1224 /* --------------------------------------------------------------------- */ 1225 1226 int 1227 tmpfs_reclaim(void *v) 1228 { 1229 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1230 1231 struct tmpfs_mount *tmp; 1232 struct tmpfs_node *node; 1233 1234 KASSERT(!VOP_ISLOCKED(vp)); 1235 1236 node = VP_TO_TMPFS_NODE(vp); 1237 tmp = VFS_TO_TMPFS(vp->v_mount); 1238 1239 if (node->tn_links == 0) 1240 VN_KNOTE(vp, NOTE_DELETE); 1241 1242 cache_purge(vp); 1243 tmpfs_free_vp(vp); 1244 1245 /* If the node referenced by this vnode was deleted by the user, 1246 * we must free its associated data structures (now that the vnode 1247 * is being reclaimed). */ 1248 if (node->tn_links == 0) 1249 tmpfs_free_node(tmp, node); 1250 1251 KASSERT(!VOP_ISLOCKED(vp)); 1252 KASSERT(vp->v_data == NULL); 1253 1254 return 0; 1255 } 1256 1257 /* --------------------------------------------------------------------- */ 1258 1259 int 1260 tmpfs_print(void *v) 1261 { 1262 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1263 1264 struct tmpfs_node *node; 1265 1266 node = VP_TO_TMPFS_NODE(vp); 1267 1268 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1269 node, node->tn_flags, node->tn_links); 1270 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1271 ", status 0x%x\n", 1272 node->tn_mode, node->tn_uid, node->tn_gid, 1273 (uintmax_t)node->tn_size, node->tn_status); 1274 1275 if (vp->v_type == VFIFO) 1276 fifo_printinfo(vp); 1277 lockmgr_printinfo(&vp->v_lock); 1278 1279 printf("\n"); 1280 1281 return 0; 1282 } 1283 1284 /* --------------------------------------------------------------------- */ 1285 1286 int 1287 tmpfs_pathconf(void *v) 1288 { 1289 int name = ((struct vop_pathconf_args *)v)->a_name; 1290 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1291 1292 int error; 1293 1294 error = 0; 1295 1296 switch (name) { 1297 case _PC_LINK_MAX: 1298 *retval = LINK_MAX; 1299 break; 1300 1301 case _PC_NAME_MAX: 1302 *retval = NAME_MAX; 1303 break; 1304 1305 case _PC_PATH_MAX: 1306 *retval = PATH_MAX; 1307 break; 1308 1309 case _PC_PIPE_BUF: 1310 *retval = PIPE_BUF; 1311 break; 1312 1313 case _PC_CHOWN_RESTRICTED: 1314 *retval = 1; 1315 break; 1316 1317 case _PC_NO_TRUNC: 1318 *retval = 1; 1319 break; 1320 1321 case _PC_SYNC_IO: 1322 *retval = 1; 1323 break; 1324 1325 case _PC_FILESIZEBITS: 1326 *retval = 0; /* XXX Don't know which value should I return. */ 1327 break; 1328 1329 default: 1330 error = EINVAL; 1331 } 1332 1333 return error; 1334 } 1335 1336 /* --------------------------------------------------------------------- */ 1337 1338 int 1339 tmpfs_truncate(void *v) 1340 { 1341 struct vnode *vp = ((struct vop_truncate_args *)v)->a_vp; 1342 off_t length = ((struct vop_truncate_args *)v)->a_length; 1343 1344 boolean_t extended; 1345 int error; 1346 struct tmpfs_node *node; 1347 1348 node = VP_TO_TMPFS_NODE(vp); 1349 extended = length > node->tn_size; 1350 1351 if (length < 0) { 1352 error = EINVAL; 1353 goto out; 1354 } 1355 1356 if (node->tn_size == length) { 1357 error = 0; 1358 goto out; 1359 } 1360 1361 error = tmpfs_reg_resize(vp, length); 1362 if (error == 0) { 1363 VN_KNOTE(vp, NOTE_ATTRIB | (extended ? NOTE_EXTEND : 0)); 1364 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1365 } 1366 1367 out: 1368 (void)VOP_UPDATE(vp, NULL, NULL, 0); 1369 1370 return error; 1371 } 1372 1373 /* --------------------------------------------------------------------- */ 1374 1375 int 1376 tmpfs_update(void *v) 1377 { 1378 struct vnode *vp = ((struct vop_update_args *)v)->a_vp; 1379 struct timespec *acc = ((struct vop_update_args *)v)->a_access; 1380 struct timespec *mod = ((struct vop_update_args *)v)->a_modify; 1381 int flags = ((struct vop_update_args *)v)->a_flags; 1382 1383 struct timespec *ts = NULL, tsb; 1384 struct tmpfs_node *node; 1385 1386 KASSERT(VOP_ISLOCKED(vp)); 1387 1388 node = VP_TO_TMPFS_NODE(vp); 1389 1390 if (flags & UPDATE_CLOSE) 1391 ; /* XXX Need to do anything special? */ 1392 1393 if (node->tn_status != 0) { 1394 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1395 if (acc == NULL) 1396 acc = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1397 node->tn_atime = *acc; 1398 } 1399 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1400 if (mod == NULL) 1401 mod = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1402 node->tn_mtime = *mod; 1403 } 1404 if (node->tn_status & TMPFS_NODE_CHANGED) { 1405 if (ts == NULL) 1406 ts = nanotime(&tsb); 1407 node->tn_ctime = *ts; 1408 } 1409 node->tn_status &= 1410 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1411 TMPFS_NODE_CHANGED); 1412 } 1413 1414 KASSERT(VOP_ISLOCKED(vp)); 1415 1416 return 0; 1417 } 1418 1419 /* --------------------------------------------------------------------- */ 1420 1421 int 1422 tmpfs_getpages(void *v) 1423 { 1424 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1425 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1426 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1427 int *count = ((struct vop_getpages_args *)v)->a_count; 1428 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1429 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1430 int advice = ((struct vop_getpages_args *)v)->a_advice; 1431 int flags = ((struct vop_getpages_args *)v)->a_flags; 1432 1433 int error; 1434 struct tmpfs_node *node; 1435 struct uvm_object *uobj; 1436 1437 KASSERT(vp->v_type == VREG); 1438 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1439 1440 node = VP_TO_TMPFS_NODE(vp); 1441 uobj = node->tn_aobj; 1442 1443 if ((flags & PGO_LOCKED) != 0) 1444 return EBUSY; 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 simple_unlock(&vp->v_interlock); 1455 1456 simple_lock(&uobj->vmobjlock); 1457 error = (*uobj->pgops->pgo_get)(uobj, offset, m, count, centeridx, 1458 access_type, advice, flags); 1459 1460 return error; 1461 } 1462 1463 /* --------------------------------------------------------------------- */ 1464 1465 int 1466 tmpfs_putpages(void *v) 1467 { 1468 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1469 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1470 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1471 int flags = ((struct vop_putpages_args *)v)->a_flags; 1472 1473 int error; 1474 struct tmpfs_node *node; 1475 struct uvm_object *uobj; 1476 1477 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1478 1479 node = VP_TO_TMPFS_NODE(vp); 1480 1481 if (vp->v_type != VREG) { 1482 simple_unlock(&vp->v_interlock); 1483 return 0; 1484 } 1485 1486 uobj = node->tn_aobj; 1487 simple_unlock(&vp->v_interlock); 1488 1489 simple_lock(&uobj->vmobjlock); 1490 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1491 1492 /* XXX mtime */ 1493 1494 return error; 1495 } 1496
Indexes created Sun Sep 21 20:09:37 GMT 2025