tmpfs_vnops.c revision 1.14
1 /* $NetBSD: tmpfs_vnops.c,v 1.14 2005/09/28 23:42:14 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, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * tmpfs vnode interface. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.14 2005/09/28 23:42:14 yamt Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/event.h> 51 #include <sys/malloc.h> 52 #include <sys/namei.h> 53 #include <sys/proc.h> 54 #include <sys/stat.h> 55 #include <sys/uio.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 59 #include <uvm/uvm.h> 60 61 #include <miscfs/fifofs/fifo.h> 62 #include <fs/tmpfs/tmpfs_vnops.h> 63 #include <fs/tmpfs/tmpfs.h> 64 65 /* --------------------------------------------------------------------- */ 66 67 /* 68 * vnode operations vector used for files stored in a tmpfs file system. 69 */ 70 int (**tmpfs_vnodeop_p)(void *); 71 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 72 { &vop_default_desc, vn_default_error }, 73 { &vop_lookup_desc, tmpfs_lookup }, 74 { &vop_create_desc, tmpfs_create }, 75 { &vop_mknod_desc, tmpfs_mknod }, 76 { &vop_open_desc, tmpfs_open }, 77 { &vop_close_desc, tmpfs_close }, 78 { &vop_access_desc, tmpfs_access }, 79 { &vop_getattr_desc, tmpfs_getattr }, 80 { &vop_setattr_desc, tmpfs_setattr }, 81 { &vop_read_desc, tmpfs_read }, 82 { &vop_write_desc, tmpfs_write }, 83 { &vop_ioctl_desc, tmpfs_ioctl }, 84 { &vop_fcntl_desc, tmpfs_fcntl }, 85 { &vop_poll_desc, tmpfs_poll }, 86 { &vop_kqfilter_desc, tmpfs_kqfilter }, 87 { &vop_revoke_desc, tmpfs_revoke }, 88 { &vop_mmap_desc, tmpfs_mmap }, 89 { &vop_fsync_desc, tmpfs_fsync }, 90 { &vop_seek_desc, tmpfs_seek }, 91 { &vop_remove_desc, tmpfs_remove }, 92 { &vop_link_desc, tmpfs_link }, 93 { &vop_rename_desc, tmpfs_rename }, 94 { &vop_mkdir_desc, tmpfs_mkdir }, 95 { &vop_rmdir_desc, tmpfs_rmdir }, 96 { &vop_symlink_desc, tmpfs_symlink }, 97 { &vop_readdir_desc, tmpfs_readdir }, 98 { &vop_readlink_desc, tmpfs_readlink }, 99 { &vop_abortop_desc, tmpfs_abortop }, 100 { &vop_inactive_desc, tmpfs_inactive }, 101 { &vop_reclaim_desc, tmpfs_reclaim }, 102 { &vop_lock_desc, tmpfs_lock }, 103 { &vop_unlock_desc, tmpfs_unlock }, 104 { &vop_bmap_desc, tmpfs_bmap }, 105 { &vop_strategy_desc, tmpfs_strategy }, 106 { &vop_print_desc, tmpfs_print }, 107 { &vop_pathconf_desc, tmpfs_pathconf }, 108 { &vop_islocked_desc, tmpfs_islocked }, 109 { &vop_advlock_desc, tmpfs_advlock }, 110 { &vop_blkatoff_desc, tmpfs_blkatoff }, 111 { &vop_valloc_desc, tmpfs_valloc }, 112 { &vop_reallocblks_desc, tmpfs_reallocblks }, 113 { &vop_vfree_desc, tmpfs_vfree }, 114 { &vop_truncate_desc, tmpfs_truncate }, 115 { &vop_update_desc, tmpfs_update }, 116 { &vop_lease_desc, tmpfs_lease }, 117 { &vop_bwrite_desc, tmpfs_bwrite }, 118 { &vop_getpages_desc, tmpfs_getpages }, 119 { &vop_putpages_desc, tmpfs_putpages }, 120 { NULL, NULL } 121 }; 122 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 123 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 124 125 /* --------------------------------------------------------------------- */ 126 127 int 128 tmpfs_lookup(void *v) 129 { 130 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 131 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 132 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 133 134 int error; 135 struct tmpfs_dirent *de; 136 struct tmpfs_node *dnode; 137 138 KASSERT(VOP_ISLOCKED(dvp)); 139 140 dnode = VP_TO_TMPFS_DIR(dvp); 141 *vpp = NULL; 142 143 /* Check accessibility of requested node as a first step. */ 144 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc); 145 if (error != 0) 146 goto out; 147 148 /* If requesting the last path component on a read-only file system 149 * with a write operation, deny it. */ 150 if ((cnp->cn_flags & ISLASTCN) && 151 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 152 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 153 error = EROFS; 154 goto out; 155 } 156 157 /* Avoid doing a linear scan of the directory if the requested 158 * directory/name couple is already in the cache. */ 159 error = cache_lookup(dvp, vpp, cnp); 160 if (error >= 0) 161 goto out; 162 163 /* We cannot be requesting the parent directory of the root node. */ 164 KASSERT(IMPLIES(dnode->tn_type == VDIR && 165 dnode->tn_parent == dnode, !(cnp->cn_flags & ISDOTDOT))); 166 167 if (cnp->cn_flags & ISDOTDOT) { 168 VOP_UNLOCK(dvp, 0); 169 170 /* Allocate a new vnode on the matching entry. */ 171 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_parent, vpp); 172 173 if (cnp->cn_flags & LOCKPARENT && 174 cnp->cn_flags & ISLASTCN) { 175 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 176 cnp->cn_flags |= PDIRUNLOCK; 177 } 178 dnode->tn_parent->tn_lookup_dirent = NULL; 179 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 180 VREF(dvp); 181 *vpp = dvp; 182 dnode->tn_lookup_dirent = NULL; 183 error = 0; 184 } else { 185 de = tmpfs_dir_lookup(dnode, cnp); 186 if (de == NULL) { 187 /* The entry was not found in the directory. 188 * This is OK iff we are creating or renaming an 189 * entry and are working on the last component of 190 * the path name. */ 191 if ((cnp->cn_flags & ISLASTCN) && 192 (cnp->cn_nameiop == CREATE || \ 193 cnp->cn_nameiop == RENAME)) { 194 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 195 cnp->cn_proc); 196 if (error != 0) 197 goto out; 198 199 /* Keep the component name in the buffer for 200 * future uses. */ 201 cnp->cn_flags |= SAVENAME; 202 203 error = EJUSTRETURN; 204 } else 205 error = ENOENT; 206 } else { 207 struct tmpfs_node *tnode; 208 209 /* The entry was found, so get its associated 210 * tmpfs_node. */ 211 tnode = de->td_node; 212 213 /* If we are not at the last path component and 214 * found a non-directory entry, raise an error. */ 215 if ((tnode->tn_type != VDIR) && 216 !(cnp->cn_flags & ISLASTCN)) { 217 error = ENOTDIR; 218 goto out; 219 } 220 221 /* If we are deleting or renaming the entry, keep 222 * track of its tmpfs_dirent so that it can be 223 * easily deleted later. */ 224 if ((cnp->cn_flags & ISLASTCN) && 225 (cnp->cn_nameiop == DELETE || 226 cnp->cn_nameiop == RENAME)) { 227 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 228 cnp->cn_proc); 229 if (error != 0) 230 goto out; 231 /* TODO: Check sticky bit. */ 232 tnode->tn_lookup_dirent = de; 233 } 234 235 /* Allocate a new vnode on the matching entry. */ 236 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 237 238 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 239 !(cnp->cn_flags & ISLASTCN))) 240 VOP_UNLOCK(dvp, 0); 241 } 242 } 243 244 /* Store the result of this lookup in the cache. Avoid this if the 245 * request was for creation, as it does not improve timings on 246 * emprical tests. */ 247 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 248 cache_enter(dvp, *vpp, cnp); 249 250 out: 251 /* If there were no errors, *vpp cannot be null and it must be 252 * locked. */ 253 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 254 255 /* dvp has to be locked if: 256 * - There were errors and relocking of dvp did not fail. 257 * - We are doing a '..' lookup, relocking of dvp did not fail 258 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 259 * - LOCKPARENT and ISLASTCN are set. */ 260 KASSERT(IMPLIES( 261 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 262 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 263 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 264 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 265 , 266 VOP_ISLOCKED(dvp))); 267 268 return error; 269 } 270 271 /* --------------------------------------------------------------------- */ 272 273 int 274 tmpfs_create(void *v) 275 { 276 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 277 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 278 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 279 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 280 281 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 282 283 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 284 } 285 /* --------------------------------------------------------------------- */ 286 287 int 288 tmpfs_mknod(void *v) 289 { 290 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 291 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 292 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 293 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 294 295 if (vap->va_type != VBLK && vap->va_type != VCHR && 296 vap->va_type != VFIFO) 297 return EINVAL; 298 299 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 300 } 301 302 /* --------------------------------------------------------------------- */ 303 304 int 305 tmpfs_open(void *v) 306 { 307 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 308 int mode = ((struct vop_open_args *)v)->a_mode; 309 310 int error; 311 struct tmpfs_node *node; 312 313 KASSERT(VOP_ISLOCKED(vp)); 314 315 node = VP_TO_TMPFS_NODE(vp); 316 KASSERT(node->tn_links > 0); 317 318 /* If the file is marked append-only, deny write requests. */ 319 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 320 error = EPERM; 321 else 322 error = 0; 323 324 KASSERT(VOP_ISLOCKED(vp)); 325 326 return error; 327 } 328 329 /* --------------------------------------------------------------------- */ 330 331 int 332 tmpfs_close(void *v) 333 { 334 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 335 336 int error; 337 struct tmpfs_node *node; 338 339 KASSERT(VOP_ISLOCKED(vp)); 340 341 node = VP_TO_TMPFS_NODE(vp); 342 343 if (node->tn_links > 0) { 344 /* Update node times. No need to do it if the node has 345 * been deleted, because it will vanish after we return. */ 346 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_CLOSE); 347 } else 348 error = 0; 349 350 return error; 351 } 352 353 /* --------------------------------------------------------------------- */ 354 355 int 356 tmpfs_access(void *v) 357 { 358 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 359 int mode = ((struct vop_access_args *)v)->a_mode; 360 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 361 362 int error; 363 struct tmpfs_node *node; 364 365 KASSERT(VOP_ISLOCKED(vp)); 366 367 node = VP_TO_TMPFS_NODE(vp); 368 369 switch (vp->v_type) { 370 case VDIR: 371 /* FALLTHROUGH */ 372 case VLNK: 373 /* FALLTHROUGH */ 374 case VREG: 375 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 376 error = EROFS; 377 goto out; 378 } 379 break; 380 381 case VBLK: 382 /* FALLTHROUGH */ 383 case VCHR: 384 /* FALLTHROUGH */ 385 case VSOCK: 386 /* FALLTHROUGH */ 387 case VFIFO: 388 break; 389 390 default: 391 error = EINVAL; 392 goto out; 393 } 394 395 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 396 error = EPERM; 397 goto out; 398 } 399 400 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 401 node->tn_gid, mode, cred); 402 403 out: 404 KASSERT(VOP_ISLOCKED(vp)); 405 406 return error; 407 } 408 409 /* --------------------------------------------------------------------- */ 410 411 int 412 tmpfs_getattr(void *v) 413 { 414 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 415 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 416 417 struct tmpfs_node *node; 418 419 node = VP_TO_TMPFS_NODE(vp); 420 421 VATTR_NULL(vap); 422 423 tmpfs_itimes(vp, NULL, NULL); 424 425 vap->va_type = vp->v_type; 426 vap->va_mode = node->tn_mode; 427 vap->va_nlink = node->tn_links; 428 vap->va_uid = node->tn_uid; 429 vap->va_gid = node->tn_gid; 430 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 431 vap->va_fileid = node->tn_id; 432 vap->va_size = node->tn_size; 433 vap->va_blocksize = PAGE_SIZE; 434 vap->va_atime = node->tn_atime; 435 vap->va_mtime = node->tn_mtime; 436 vap->va_ctime = node->tn_ctime; 437 vap->va_birthtime = node->tn_birthtime; 438 vap->va_gen = node->tn_gen; 439 vap->va_flags = node->tn_flags; 440 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 441 node->tn_rdev : VNOVAL; 442 vap->va_bytes = round_page(node->tn_size); 443 vap->va_filerev = VNOVAL; 444 vap->va_vaflags = 0; 445 vap->va_spare = VNOVAL; /* XXX */ 446 447 return 0; 448 } 449 450 /* --------------------------------------------------------------------- */ 451 452 /* XXX Should this operation be atomic? I think it should, but code in 453 * XXX other places (e.g., ufs) doesn't seem to be... */ 454 int 455 tmpfs_setattr(void *v) 456 { 457 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 458 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 459 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 460 struct proc *p = ((struct vop_setattr_args *)v)->a_p; 461 462 int error, error2; 463 464 KASSERT(VOP_ISLOCKED(vp)); 465 466 error = 0; 467 468 /* Abort if any unsettable attribute is given. */ 469 if (vap->va_type != VNON || 470 vap->va_nlink != VNOVAL || 471 vap->va_fsid != VNOVAL || 472 vap->va_fileid != VNOVAL || 473 vap->va_blocksize != VNOVAL || 474 vap->va_ctime.tv_sec != VNOVAL || 475 vap->va_ctime.tv_nsec != VNOVAL || 476 vap->va_birthtime.tv_sec != VNOVAL || 477 vap->va_birthtime.tv_nsec != VNOVAL || 478 vap->va_gen != VNOVAL || 479 vap->va_rdev != VNOVAL || 480 vap->va_bytes != VNOVAL) 481 error = EINVAL; 482 483 if (error == 0 && (vap->va_flags != VNOVAL)) 484 error = tmpfs_chflags(vp, vap->va_flags, cred, p); 485 486 if (error == 0 && (vap->va_size != VNOVAL)) 487 error = tmpfs_chsize(vp, vap->va_size, cred, p); 488 489 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 490 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 491 492 if (error == 0 && (vap->va_mode != VNOVAL)) 493 error = tmpfs_chmod(vp, vap->va_mode, cred, p); 494 495 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 496 vap->va_atime.tv_nsec != VNOVAL) || 497 (vap->va_mtime.tv_sec != VNOVAL && 498 vap->va_mtime.tv_nsec != VNOVAL))) 499 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 500 vap->va_vaflags, cred, p); 501 502 /* Update the node times. We give preference to the error codes 503 * generated by this function rather than the ones that may arise 504 * from tmpfs_update. */ 505 error2 = VOP_UPDATE(vp, NULL, NULL, 0); 506 if (error == 0) 507 error = error2; 508 509 KASSERT(VOP_ISLOCKED(vp)); 510 511 return error; 512 } 513 514 /* --------------------------------------------------------------------- */ 515 516 int 517 tmpfs_read(void *v) 518 { 519 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 520 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 521 522 int error; 523 int flags; 524 struct tmpfs_node *node; 525 struct uvm_object *uobj; 526 527 KASSERT(VOP_ISLOCKED(vp)); 528 529 node = VP_TO_TMPFS_NODE(vp); 530 531 if (vp->v_type != VREG) { 532 error = EISDIR; 533 goto out; 534 } 535 536 if (uio->uio_offset < 0) { 537 error = EINVAL; 538 goto out; 539 } 540 541 node->tn_status |= TMPFS_NODE_ACCESSED; 542 543 uobj = node->tn_aobj; 544 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 545 error = 0; 546 while (error == 0 && uio->uio_resid > 0) { 547 vsize_t len; 548 void *win; 549 550 if (node->tn_size <= uio->uio_offset) 551 break; 552 553 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 554 if (len == 0) 555 break; 556 557 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_READ); 558 error = uiomove(win, len, uio); 559 ubc_release(win, flags); 560 } 561 562 out: 563 KASSERT(VOP_ISLOCKED(vp)); 564 565 return error; 566 } 567 568 /* --------------------------------------------------------------------- */ 569 570 int 571 tmpfs_write(void *v) 572 { 573 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 574 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 575 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 576 577 boolean_t extended; 578 int error; 579 int flags; 580 off_t oldsize; 581 struct tmpfs_node *node; 582 struct uvm_object *uobj; 583 584 KASSERT(VOP_ISLOCKED(vp)); 585 586 node = VP_TO_TMPFS_NODE(vp); 587 oldsize = node->tn_size; 588 589 if (uio->uio_offset < 0 || vp->v_type != VREG) { 590 error = EINVAL; 591 goto out; 592 } 593 594 if (uio->uio_resid == 0) { 595 error = 0; 596 goto out; 597 } 598 599 if (ioflag & IO_APPEND) 600 uio->uio_offset = node->tn_size; 601 602 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 603 if (extended) { 604 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 605 if (error != 0) 606 goto out; 607 } 608 609 uobj = node->tn_aobj; 610 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 611 error = 0; 612 while (error == 0 && uio->uio_resid > 0) { 613 vsize_t len; 614 void *win; 615 616 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 617 if (len == 0) 618 break; 619 620 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_WRITE); 621 error = uiomove(win, len, uio); 622 ubc_release(win, flags); 623 } 624 625 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 626 (extended ? TMPFS_NODE_CHANGED : 0); 627 628 if (error != 0) 629 (void)tmpfs_reg_resize(vp, oldsize); 630 631 out: 632 KASSERT(VOP_ISLOCKED(vp)); 633 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 634 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 635 636 return error; 637 } 638 639 /* --------------------------------------------------------------------- */ 640 641 int 642 tmpfs_fsync(void *v) 643 { 644 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 645 646 KASSERT(VOP_ISLOCKED(vp)); 647 648 return VOP_UPDATE(vp, NULL, NULL, 0); 649 } 650 651 /* --------------------------------------------------------------------- */ 652 653 int 654 tmpfs_remove(void *v) 655 { 656 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 657 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 658 659 int error; 660 struct tmpfs_dirent *de; 661 struct tmpfs_mount *tmp; 662 struct tmpfs_node *dnode; 663 struct tmpfs_node *node; 664 665 KASSERT(VOP_ISLOCKED(dvp)); 666 KASSERT(VOP_ISLOCKED(vp)); 667 668 dnode = VP_TO_TMPFS_DIR(dvp); 669 node = VP_TO_TMPFS_NODE(vp); 670 tmp = VFS_TO_TMPFS(vp->v_mount); 671 de = node->tn_lookup_dirent; 672 KASSERT(de != NULL); 673 674 /* XXX: Why isn't this done by the caller? */ 675 if (vp->v_type == VDIR) { 676 error = EISDIR; 677 goto out; 678 } 679 680 /* Files marked as immutable or append-only cannot be deleted. */ 681 if (node->tn_flags & (IMMUTABLE | APPEND)) { 682 error = EPERM; 683 goto out; 684 } 685 686 /* Remove the entry from the directory; as it is a file, we do not 687 * have to change the number of hard links of the directory. */ 688 tmpfs_dir_detach(dvp, de); 689 690 /* Notify interested parties about the modification of dvp. 691 * The removal of vp is notified when it is reclaimed. */ 692 VN_KNOTE(dvp, NOTE_WRITE); 693 694 /* Free the directory entry we just deleted. Note that the node 695 * referred by it will not be removed until the vnode is really 696 * reclaimed. */ 697 tmpfs_free_dirent(tmp, de, TRUE); 698 699 error = 0; 700 701 out: 702 vput(dvp); 703 vput(vp); 704 705 KASSERT(!VOP_ISLOCKED(dvp)); 706 707 return error; 708 } 709 710 /* --------------------------------------------------------------------- */ 711 712 int 713 tmpfs_link(void *v) 714 { 715 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 716 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 717 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 718 719 int error; 720 struct tmpfs_dirent *de; 721 struct tmpfs_node *dnode; 722 struct tmpfs_node *node; 723 724 KASSERT(VOP_ISLOCKED(dvp)); 725 KASSERT(!VOP_ISLOCKED(vp)); 726 KASSERT(cnp->cn_flags & HASBUF); 727 KASSERT(dvp != vp); /* XXX When can this be false? */ 728 729 dnode = VP_TO_TMPFS_DIR(dvp); 730 node = VP_TO_TMPFS_NODE(vp); 731 732 /* Lock vp because we will need to run VOP_UPDATE over it, which 733 * needs the vnode to be locked. */ 734 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 735 if (error != 0) 736 goto out; 737 738 /* XXX: Why aren't the following two tests done by the caller? */ 739 740 /* Hard links of directories are forbidden. */ 741 if (vp->v_type == VDIR) { 742 error = EPERM; 743 goto out; 744 } 745 746 /* Cannot create cross-device links. */ 747 if (dvp->v_mount != vp->v_mount) { 748 error = EXDEV; 749 goto out; 750 } 751 752 /* Ensure that we do not overflow the maximum number of links imposed 753 * by the system. */ 754 KASSERT(node->tn_links <= LINK_MAX); 755 if (node->tn_links == LINK_MAX) { 756 error = EMLINK; 757 goto out; 758 } 759 760 /* We cannot create links of files marked immutable or append-only. */ 761 if (node->tn_flags & (IMMUTABLE | APPEND)) { 762 error = EPERM; 763 goto out; 764 } 765 766 /* Allocate a new directory entry to represent the node. */ 767 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 768 cnp->cn_nameptr, cnp->cn_namelen, &de); 769 if (error != 0) 770 goto out; 771 772 /* Insert the new directory entry into the appropriate directory. */ 773 tmpfs_dir_attach(dvp, de); 774 VN_KNOTE(dvp, NOTE_WRITE); 775 776 /* vp link count has changed, so update node times. */ 777 node->tn_status |= TMPFS_NODE_CHANGED; 778 (void)VOP_UPDATE(vp, NULL, NULL, 0); 779 780 error = 0; 781 782 out: 783 if (VOP_ISLOCKED(vp)) 784 VOP_UNLOCK(vp, 0); 785 786 PNBUF_PUT(cnp->cn_pnbuf); 787 788 vput(dvp); 789 790 /* XXX Locking status of dvp does not match manual page. */ 791 KASSERT(!VOP_ISLOCKED(dvp)); 792 KASSERT(!VOP_ISLOCKED(vp)); 793 794 return error; 795 } 796 797 /* --------------------------------------------------------------------- */ 798 799 int 800 tmpfs_rename(void *v) 801 { 802 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 803 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 804 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 805 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 806 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 807 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 808 809 char *newname; 810 int error; 811 struct tmpfs_dirent *de; 812 struct tmpfs_mount *tmp; 813 struct tmpfs_node *fdnode; 814 struct tmpfs_node *fnode; 815 struct tmpfs_node *tdnode; 816 817 KASSERT(VOP_ISLOCKED(tdvp)); 818 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 819 KASSERT(fcnp->cn_flags & HASBUF); 820 KASSERT(tcnp->cn_flags & HASBUF); 821 822 fdnode = VP_TO_TMPFS_DIR(fdvp); 823 fnode = VP_TO_TMPFS_NODE(fvp); 824 de = fnode->tn_lookup_dirent; 825 826 /* Disallow cross-device renames. 827 * XXX Why isn't this done by the caller? */ 828 if (fvp->v_mount != tdvp->v_mount || 829 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 830 error = EXDEV; 831 goto out; 832 } 833 834 tmp = VFS_TO_TMPFS(tdvp->v_mount); 835 tdnode = VP_TO_TMPFS_DIR(tdvp); 836 837 /* If source and target are the same file, there is nothing to do. */ 838 if (fvp == tvp) { 839 error = 0; 840 goto out; 841 } 842 843 /* Avoid manipulating '.' and '..' entries. */ 844 if (de == NULL) { 845 KASSERT(fvp->v_type == VDIR); 846 error = EINVAL; 847 goto out; 848 } 849 KASSERT(de->td_node == fnode); 850 851 /* If we need to move the directory between entries, lock the 852 * source so that we can safely operate on it. */ 853 if (fdnode != tdnode) { 854 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 855 if (error != 0) 856 goto out; 857 } 858 859 /* Ensure that we have enough memory to hold the new name, if it 860 * has to be changed. */ 861 if (fcnp->cn_namelen != tcnp->cn_namelen || 862 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 863 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 864 tcnp->cn_namelen, 0); 865 if (newname == NULL) { 866 error = ENOSPC; 867 goto out_locked; 868 } 869 } else 870 newname = NULL; 871 872 /* If the node is being moved to another directory, we have to do 873 * the move. */ 874 if (fdnode != tdnode) { 875 /* In case we are moving a directory, we have to adjust its 876 * parent to point to the new parent. */ 877 if (de->td_node->tn_type == VDIR) { 878 struct tmpfs_node *n; 879 880 /* Ensure the target directory is not a child of the 881 * directory being moved. Otherwise, we'd end up 882 * with stale nodes. */ 883 n = tdnode; 884 while (n != n->tn_parent) { 885 if (n == fnode) { 886 error = EINVAL; 887 goto out_locked; 888 } 889 n = n->tn_parent; 890 } 891 892 /* Adjust the parent pointer. */ 893 TMPFS_VALIDATE_DIR(fnode); 894 de->td_node->tn_parent = tdnode; 895 896 /* As a result of changing the target of the '..' 897 * entry, the link count of the source and target 898 * directories has to be adjusted. */ 899 fdnode->tn_links--; 900 tdnode->tn_links++; 901 } 902 903 /* Do the move: just remove the entry from the source directory 904 * and insert it into the target one. */ 905 tmpfs_dir_detach(fdvp, de); 906 tmpfs_dir_attach(tdvp, de); 907 908 /* Notify listeners of fdvp about the change in the directory. 909 * We can do it at this point because we aren't touching fdvp 910 * any more below. */ 911 VN_KNOTE(fdvp, NOTE_WRITE); 912 } 913 914 /* If the name has changed, we need to make it effective by changing 915 * it in the directory entry. */ 916 if (newname != NULL) { 917 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 918 KASSERT(tcnp->cn_namelen < 0xffff); 919 920 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 921 de->td_namelen); 922 de->td_namelen = (uint16_t)tcnp->cn_namelen; 923 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 924 de->td_name = newname; 925 926 fnode->tn_status |= TMPFS_NODE_MODIFIED; 927 } 928 929 /* If we are overwriting an entry, we have to remove the old one 930 * from the target directory. */ 931 if (tvp != NULL) { 932 struct tmpfs_node *tnode; 933 934 tnode = VP_TO_TMPFS_NODE(tvp); 935 936 /* The source node cannot be a directory in this case. */ 937 KASSERT(fnode->tn_type != VDIR); 938 939 /* Remove the old entry from the target directory. */ 940 de = tnode->tn_lookup_dirent; 941 tmpfs_dir_detach(tdvp, de); 942 943 /* Free the directory entry we just deleted. Note that the 944 * node referred by it will not be removed until the vnode is 945 * really reclaimed. */ 946 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 947 } 948 949 /* Notify listeners of tdvp about the change in the directory (either 950 * because a new entry was added or because one was removed). */ 951 VN_KNOTE(tdvp, NOTE_WRITE); 952 953 error = 0; 954 955 out_locked: 956 if (fdnode != tdnode) 957 VOP_UNLOCK(fdvp, 0); 958 959 out: 960 /* Release target nodes. */ 961 /* XXX: I don't understand when tdvp can be the same as tvp, but 962 * other code takes care of this... */ 963 if (tdvp == tvp) 964 vrele(tdvp); 965 else 966 vput(tdvp); 967 if (tvp != NULL) 968 vput(tvp); 969 970 /* Release source nodes. */ 971 vrele(fdvp); 972 vrele(fvp); 973 974 return error; 975 } 976 977 /* --------------------------------------------------------------------- */ 978 979 int 980 tmpfs_mkdir(void *v) 981 { 982 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 983 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 984 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 985 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 986 987 KASSERT(vap->va_type == VDIR); 988 989 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 990 } 991 992 /* --------------------------------------------------------------------- */ 993 994 int 995 tmpfs_rmdir(void *v) 996 { 997 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 998 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 999 1000 int error; 1001 struct tmpfs_dirent *de; 1002 struct tmpfs_mount *tmp; 1003 struct tmpfs_node *dnode; 1004 struct tmpfs_node *node; 1005 1006 KASSERT(VOP_ISLOCKED(dvp)); 1007 KASSERT(VOP_ISLOCKED(vp)); 1008 1009 tmp = VFS_TO_TMPFS(dvp->v_mount); 1010 dnode = VP_TO_TMPFS_DIR(dvp); 1011 node = VP_TO_TMPFS_DIR(vp); 1012 KASSERT(node->tn_parent == dnode); 1013 1014 /* Get the directory entry associated with node (vp). This was 1015 * filled by tmpfs_lookup while looking up the entry. */ 1016 de = node->tn_lookup_dirent; 1017 KASSERT(TMPFS_DIRENT_MATCHES(de, 1018 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1019 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1020 1021 /* Directories with more than two entries ('.' and '..') cannot be 1022 * removed. */ 1023 if (node->tn_size > 0) { 1024 error = ENOTEMPTY; 1025 goto out; 1026 } 1027 1028 /* Check flags to see if we are allowed to remove the directory. */ 1029 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1030 error = EPERM; 1031 goto out; 1032 } 1033 1034 /* Detach the directory entry from the directory (dnode). */ 1035 tmpfs_dir_detach(dvp, de); 1036 1037 node->tn_links--; 1038 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1039 TMPFS_NODE_MODIFIED; 1040 node->tn_parent->tn_links--; 1041 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1042 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1043 1044 /* Notify modification of parent directory and release it. */ 1045 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1046 cache_purge(dvp); /* XXX Is this needed? */ 1047 vput(dvp); 1048 1049 /* Free the directory entry we just deleted. Note that the node 1050 * referred by it will not be removed until the vnode is really 1051 * reclaimed. */ 1052 tmpfs_free_dirent(tmp, de, TRUE); 1053 1054 /* Release the deleted vnode (will destroy the node, notify 1055 * interested parties and clean it from the cache). */ 1056 vput(vp); 1057 1058 error = 0; 1059 1060 out: 1061 if (error != 0) { 1062 vput(dvp); 1063 vput(vp); 1064 } 1065 1066 return error; 1067 } 1068 1069 /* --------------------------------------------------------------------- */ 1070 1071 int 1072 tmpfs_symlink(void *v) 1073 { 1074 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1075 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1076 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1077 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1078 char *target = ((struct vop_symlink_args *)v)->a_target; 1079 1080 KASSERT(vap->va_type == VLNK); 1081 1082 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1083 } 1084 1085 /* --------------------------------------------------------------------- */ 1086 1087 int 1088 tmpfs_readdir(void *v) 1089 { 1090 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1091 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1092 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1093 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1094 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1095 1096 int error; 1097 off_t startoff; 1098 off_t cnt; 1099 struct tmpfs_node *node; 1100 1101 KASSERT(VOP_ISLOCKED(vp)); 1102 1103 /* This operation only makes sense on directory nodes. */ 1104 if (vp->v_type != VDIR) { 1105 error = ENOTDIR; 1106 goto out; 1107 } 1108 1109 node = VP_TO_TMPFS_DIR(vp); 1110 1111 startoff = uio->uio_offset; 1112 1113 cnt = 0; 1114 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1115 error = tmpfs_dir_getdotdent(node, uio); 1116 if (error == -1) { 1117 error = 0; 1118 goto outok; 1119 } else if (error != 0) 1120 goto outok; 1121 cnt++; 1122 } 1123 1124 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1125 error = tmpfs_dir_getdotdotdent(node, uio); 1126 if (error == -1) { 1127 error = 0; 1128 goto outok; 1129 } else if (error != 0) 1130 goto outok; 1131 cnt++; 1132 } 1133 1134 error = tmpfs_dir_getdents(node, uio, &cnt); 1135 if (error == -1) 1136 error = 0; 1137 KASSERT(error >= 0); 1138 1139 outok: 1140 /* This label assumes that startoff has been 1141 * initialized. If the compiler didn't spit out warnings, we'd 1142 * simply make this one be 'out' and drop 'outok'. */ 1143 1144 if (eofflag != NULL) 1145 *eofflag = 1146 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1147 1148 /* Update NFS-related variables. */ 1149 if (error == 0 && cookies != NULL && ncookies != NULL) { 1150 off_t i; 1151 off_t off = startoff; 1152 struct tmpfs_dirent *de = NULL; 1153 1154 *ncookies = cnt; 1155 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1156 1157 for (i = 0; i < cnt; i++) { 1158 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1159 if (off == TMPFS_DIRCOOKIE_DOT) { 1160 off = TMPFS_DIRCOOKIE_DOTDOT; 1161 } else { 1162 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1163 de = TAILQ_FIRST(&node->tn_dir); 1164 } else if (de != NULL) { 1165 de = TAILQ_NEXT(de, td_entries); 1166 } else { 1167 de = tmpfs_dir_lookupbycookie(node, 1168 off); 1169 KASSERT(de != NULL); 1170 de = TAILQ_NEXT(de, td_entries); 1171 } 1172 if (de == NULL) { 1173 off = TMPFS_DIRCOOKIE_EOF; 1174 } else { 1175 off = TMPFS_DIRCOOKIE(de); 1176 } 1177 } 1178 1179 (*cookies)[i] = off; 1180 } 1181 KASSERT(uio->uio_offset == off); 1182 } 1183 1184 out: 1185 KASSERT(VOP_ISLOCKED(vp)); 1186 1187 return error; 1188 } 1189 1190 /* --------------------------------------------------------------------- */ 1191 1192 int 1193 tmpfs_readlink(void *v) 1194 { 1195 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1196 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1197 1198 int error; 1199 struct tmpfs_node *node; 1200 1201 KASSERT(VOP_ISLOCKED(vp)); 1202 KASSERT(uio->uio_offset == 0); 1203 KASSERT(vp->v_type == VLNK); 1204 1205 node = VP_TO_TMPFS_NODE(vp); 1206 1207 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1208 uio); 1209 node->tn_status |= TMPFS_NODE_ACCESSED; 1210 1211 KASSERT(VOP_ISLOCKED(vp)); 1212 1213 return error; 1214 } 1215 1216 /* --------------------------------------------------------------------- */ 1217 1218 int 1219 tmpfs_inactive(void *v) 1220 { 1221 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1222 struct proc *p = ((struct vop_inactive_args *)v)->a_p; 1223 1224 struct tmpfs_node *node; 1225 1226 KASSERT(VOP_ISLOCKED(vp)); 1227 1228 node = VP_TO_TMPFS_NODE(vp); 1229 1230 VOP_UNLOCK(vp, 0); 1231 1232 if (node->tn_links == 0) 1233 vrecycle(vp, NULL, p); 1234 1235 return 0; 1236 } 1237 1238 /* --------------------------------------------------------------------- */ 1239 1240 int 1241 tmpfs_reclaim(void *v) 1242 { 1243 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1244 1245 struct tmpfs_mount *tmp; 1246 struct tmpfs_node *node; 1247 1248 KASSERT(!VOP_ISLOCKED(vp)); 1249 1250 node = VP_TO_TMPFS_NODE(vp); 1251 tmp = VFS_TO_TMPFS(vp->v_mount); 1252 1253 if (node->tn_links == 0) 1254 VN_KNOTE(vp, NOTE_DELETE); 1255 1256 cache_purge(vp); 1257 tmpfs_free_vp(vp); 1258 1259 /* If the node referenced by this vnode was deleted by the user, 1260 * we must free its associated data structures (now that the vnode 1261 * is being reclaimed). */ 1262 if (node->tn_links == 0) 1263 tmpfs_free_node(tmp, node); 1264 1265 KASSERT(!VOP_ISLOCKED(vp)); 1266 KASSERT(vp->v_data == NULL); 1267 1268 return 0; 1269 } 1270 1271 /* --------------------------------------------------------------------- */ 1272 1273 int 1274 tmpfs_print(void *v) 1275 { 1276 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1277 1278 struct tmpfs_node *node; 1279 1280 node = VP_TO_TMPFS_NODE(vp); 1281 1282 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1283 node, node->tn_flags, node->tn_links); 1284 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1285 ", status 0x%x\n", 1286 node->tn_mode, node->tn_uid, node->tn_gid, 1287 (uintmax_t)node->tn_size, node->tn_status); 1288 1289 if (vp->v_type == VFIFO) 1290 fifo_printinfo(vp); 1291 lockmgr_printinfo(&vp->v_lock); 1292 1293 printf("\n"); 1294 1295 return 0; 1296 } 1297 1298 /* --------------------------------------------------------------------- */ 1299 1300 int 1301 tmpfs_pathconf(void *v) 1302 { 1303 int name = ((struct vop_pathconf_args *)v)->a_name; 1304 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1305 1306 int error; 1307 1308 error = 0; 1309 1310 switch (name) { 1311 case _PC_LINK_MAX: 1312 *retval = LINK_MAX; 1313 break; 1314 1315 case _PC_NAME_MAX: 1316 *retval = NAME_MAX; 1317 break; 1318 1319 case _PC_PATH_MAX: 1320 *retval = PATH_MAX; 1321 break; 1322 1323 case _PC_PIPE_BUF: 1324 *retval = PIPE_BUF; 1325 break; 1326 1327 case _PC_CHOWN_RESTRICTED: 1328 *retval = 1; 1329 break; 1330 1331 case _PC_NO_TRUNC: 1332 *retval = 1; 1333 break; 1334 1335 case _PC_SYNC_IO: 1336 *retval = 1; 1337 break; 1338 1339 case _PC_FILESIZEBITS: 1340 *retval = 0; /* XXX Don't know which value should I return. */ 1341 break; 1342 1343 default: 1344 error = EINVAL; 1345 } 1346 1347 return error; 1348 } 1349 1350 /* --------------------------------------------------------------------- */ 1351 1352 int 1353 tmpfs_truncate(void *v) 1354 { 1355 struct vnode *vp = ((struct vop_truncate_args *)v)->a_vp; 1356 off_t length = ((struct vop_truncate_args *)v)->a_length; 1357 1358 boolean_t extended; 1359 int error; 1360 struct tmpfs_node *node; 1361 1362 node = VP_TO_TMPFS_NODE(vp); 1363 extended = length > node->tn_size; 1364 1365 if (length < 0) { 1366 error = EINVAL; 1367 goto out; 1368 } 1369 1370 if (node->tn_size == length) { 1371 error = 0; 1372 goto out; 1373 } 1374 1375 error = tmpfs_reg_resize(vp, length); 1376 if (error == 0) { 1377 VN_KNOTE(vp, NOTE_ATTRIB | (extended ? NOTE_EXTEND : 0)); 1378 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1379 } 1380 1381 out: 1382 (void)VOP_UPDATE(vp, NULL, NULL, 0); 1383 1384 return error; 1385 } 1386 1387 /* --------------------------------------------------------------------- */ 1388 1389 int 1390 tmpfs_update(void *v) 1391 { 1392 struct vnode *vp = ((struct vop_update_args *)v)->a_vp; 1393 struct timespec *acc = ((struct vop_update_args *)v)->a_access; 1394 struct timespec *mod = ((struct vop_update_args *)v)->a_modify; 1395 int flags = ((struct vop_update_args *)v)->a_flags; 1396 1397 struct tmpfs_node *node; 1398 1399 KASSERT(VOP_ISLOCKED(vp)); 1400 1401 node = VP_TO_TMPFS_NODE(vp); 1402 1403 if (flags & UPDATE_CLOSE) 1404 ; /* XXX Need to do anything special? */ 1405 1406 tmpfs_itimes(vp, acc, mod); 1407 1408 KASSERT(VOP_ISLOCKED(vp)); 1409 1410 return 0; 1411 } 1412 1413 /* --------------------------------------------------------------------- */ 1414 1415 int 1416 tmpfs_getpages(void *v) 1417 { 1418 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1419 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1420 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1421 int *count = ((struct vop_getpages_args *)v)->a_count; 1422 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1423 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1424 int advice = ((struct vop_getpages_args *)v)->a_advice; 1425 int flags = ((struct vop_getpages_args *)v)->a_flags; 1426 1427 int error; 1428 struct tmpfs_node *node; 1429 struct uvm_object *uobj; 1430 int npages = *count; 1431 1432 KASSERT(vp->v_type == VREG); 1433 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1434 1435 node = VP_TO_TMPFS_NODE(vp); 1436 uobj = node->tn_aobj; 1437 1438 /* We currently don't rely on PGO_PASTEOF. */ 1439 1440 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1441 if ((flags & PGO_LOCKED) == 0) 1442 simple_unlock(&vp->v_interlock); 1443 return EINVAL; 1444 } 1445 1446 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1447 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1448 } 1449 1450 if ((flags & PGO_LOCKED) != 0) 1451 return EBUSY; 1452 1453 if ((flags & PGO_NOTIMESTAMP) == 0) { 1454 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1455 node->tn_status |= TMPFS_NODE_ACCESSED; 1456 1457 if ((access_type & VM_PROT_WRITE) != 0) 1458 node->tn_status |= TMPFS_NODE_MODIFIED; 1459 } 1460 1461 simple_unlock(&vp->v_interlock); 1462 1463 simple_lock(&uobj->vmobjlock); 1464 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1465 access_type, advice, flags); 1466 1467 return error; 1468 } 1469 1470 /* --------------------------------------------------------------------- */ 1471 1472 int 1473 tmpfs_putpages(void *v) 1474 { 1475 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1476 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1477 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1478 int flags = ((struct vop_putpages_args *)v)->a_flags; 1479 1480 int error; 1481 struct tmpfs_node *node; 1482 struct uvm_object *uobj; 1483 1484 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1485 1486 node = VP_TO_TMPFS_NODE(vp); 1487 1488 if (vp->v_type != VREG) { 1489 simple_unlock(&vp->v_interlock); 1490 return 0; 1491 } 1492 1493 uobj = node->tn_aobj; 1494 simple_unlock(&vp->v_interlock); 1495 1496 simple_lock(&uobj->vmobjlock); 1497 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1498 1499 /* XXX mtime */ 1500 1501 return error; 1502 } 1503
Indexes created Sun Sep 21 15:09:59 GMT 2025