tmpfs_vnops.c revision 1.21
1 /* $NetBSD: tmpfs_vnops.c,v 1.21 2006/02/16 14:57:50 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * tmpfs vnode interface. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.21 2006/02/16 14:57:50 jmmv Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/event.h> 51 #include <sys/malloc.h> 52 #include <sys/namei.h> 53 #include <sys/proc.h> 54 #include <sys/stat.h> 55 #include <sys/uio.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 #include <sys/lockf.h> 59 60 #include <uvm/uvm.h> 61 62 #include <miscfs/fifofs/fifo.h> 63 #include <fs/tmpfs/tmpfs_vnops.h> 64 #include <fs/tmpfs/tmpfs.h> 65 66 /* --------------------------------------------------------------------- */ 67 68 /* 69 * vnode operations vector used for files stored in a tmpfs file system. 70 */ 71 int (**tmpfs_vnodeop_p)(void *); 72 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 73 { &vop_default_desc, vn_default_error }, 74 { &vop_lookup_desc, tmpfs_lookup }, 75 { &vop_create_desc, tmpfs_create }, 76 { &vop_mknod_desc, tmpfs_mknod }, 77 { &vop_open_desc, tmpfs_open }, 78 { &vop_close_desc, tmpfs_close }, 79 { &vop_access_desc, tmpfs_access }, 80 { &vop_getattr_desc, tmpfs_getattr }, 81 { &vop_setattr_desc, tmpfs_setattr }, 82 { &vop_read_desc, tmpfs_read }, 83 { &vop_write_desc, tmpfs_write }, 84 { &vop_ioctl_desc, tmpfs_ioctl }, 85 { &vop_fcntl_desc, tmpfs_fcntl }, 86 { &vop_poll_desc, tmpfs_poll }, 87 { &vop_kqfilter_desc, tmpfs_kqfilter }, 88 { &vop_revoke_desc, tmpfs_revoke }, 89 { &vop_mmap_desc, tmpfs_mmap }, 90 { &vop_fsync_desc, tmpfs_fsync }, 91 { &vop_seek_desc, tmpfs_seek }, 92 { &vop_remove_desc, tmpfs_remove }, 93 { &vop_link_desc, tmpfs_link }, 94 { &vop_rename_desc, tmpfs_rename }, 95 { &vop_mkdir_desc, tmpfs_mkdir }, 96 { &vop_rmdir_desc, tmpfs_rmdir }, 97 { &vop_symlink_desc, tmpfs_symlink }, 98 { &vop_readdir_desc, tmpfs_readdir }, 99 { &vop_readlink_desc, tmpfs_readlink }, 100 { &vop_abortop_desc, tmpfs_abortop }, 101 { &vop_inactive_desc, tmpfs_inactive }, 102 { &vop_reclaim_desc, tmpfs_reclaim }, 103 { &vop_lock_desc, tmpfs_lock }, 104 { &vop_unlock_desc, tmpfs_unlock }, 105 { &vop_bmap_desc, tmpfs_bmap }, 106 { &vop_strategy_desc, tmpfs_strategy }, 107 { &vop_print_desc, tmpfs_print }, 108 { &vop_pathconf_desc, tmpfs_pathconf }, 109 { &vop_islocked_desc, tmpfs_islocked }, 110 { &vop_advlock_desc, tmpfs_advlock }, 111 { &vop_lease_desc, tmpfs_lease }, 112 { &vop_bwrite_desc, tmpfs_bwrite }, 113 { &vop_getpages_desc, tmpfs_getpages }, 114 { &vop_putpages_desc, tmpfs_putpages }, 115 { NULL, NULL } 116 }; 117 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 118 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 119 120 /* --------------------------------------------------------------------- */ 121 122 int 123 tmpfs_lookup(void *v) 124 { 125 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 126 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 127 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 128 129 int error; 130 struct tmpfs_dirent *de; 131 struct tmpfs_node *dnode; 132 133 KASSERT(VOP_ISLOCKED(dvp)); 134 135 dnode = VP_TO_TMPFS_DIR(dvp); 136 *vpp = NULL; 137 138 /* Check accessibility of requested node as a first step. */ 139 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp); 140 if (error != 0) 141 goto out; 142 143 /* If requesting the last path component on a read-only file system 144 * with a write operation, deny it. */ 145 if ((cnp->cn_flags & ISLASTCN) && 146 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 147 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 148 error = EROFS; 149 goto out; 150 } 151 152 /* Avoid doing a linear scan of the directory if the requested 153 * directory/name couple is already in the cache. */ 154 error = cache_lookup(dvp, vpp, cnp); 155 if (error >= 0) 156 goto out; 157 158 /* We cannot be requesting the parent directory of the root node. */ 159 KASSERT(IMPLIES(dnode->tn_type == VDIR && 160 dnode->tn_spec.tn_dir.tn_parent == dnode, 161 !(cnp->cn_flags & ISDOTDOT))); 162 163 if (cnp->cn_flags & ISDOTDOT) { 164 VOP_UNLOCK(dvp, 0); 165 166 /* Allocate a new vnode on the matching entry. */ 167 error = tmpfs_alloc_vp(dvp->v_mount, 168 dnode->tn_spec.tn_dir.tn_parent, vpp); 169 170 if (cnp->cn_flags & LOCKPARENT && 171 cnp->cn_flags & ISLASTCN) { 172 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 173 cnp->cn_flags |= PDIRUNLOCK; 174 } 175 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 176 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 177 VREF(dvp); 178 *vpp = dvp; 179 dnode->tn_lookup_dirent = NULL; 180 error = 0; 181 } else { 182 de = tmpfs_dir_lookup(dnode, cnp); 183 if (de == NULL) { 184 /* The entry was not found in the directory. 185 * This is OK iff we are creating or renaming an 186 * entry and are working on the last component of 187 * the path name. */ 188 if ((cnp->cn_flags & ISLASTCN) && 189 (cnp->cn_nameiop == CREATE || \ 190 cnp->cn_nameiop == RENAME)) { 191 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 192 cnp->cn_lwp); 193 if (error != 0) 194 goto out; 195 196 /* Keep the component name in the buffer for 197 * future uses. */ 198 cnp->cn_flags |= SAVENAME; 199 200 error = EJUSTRETURN; 201 } else 202 error = ENOENT; 203 } else { 204 struct tmpfs_node *tnode; 205 206 /* The entry was found, so get its associated 207 * tmpfs_node. */ 208 tnode = de->td_node; 209 210 /* If we are not at the last path component and 211 * found a non-directory or non-link entry (which 212 * may itself be pointing to a directory), raise 213 * an error. */ 214 if ((tnode->tn_type != VDIR && 215 tnode->tn_type != VLNK) && 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_lwp); 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 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 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 346 } 347 348 return 0; 349 } 350 351 /* --------------------------------------------------------------------- */ 352 353 int 354 tmpfs_access(void *v) 355 { 356 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 357 int mode = ((struct vop_access_args *)v)->a_mode; 358 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 359 360 int error; 361 struct tmpfs_node *node; 362 363 KASSERT(VOP_ISLOCKED(vp)); 364 365 node = VP_TO_TMPFS_NODE(vp); 366 367 switch (vp->v_type) { 368 case VDIR: 369 /* FALLTHROUGH */ 370 case VLNK: 371 /* FALLTHROUGH */ 372 case VREG: 373 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 374 error = EROFS; 375 goto out; 376 } 377 break; 378 379 case VBLK: 380 /* FALLTHROUGH */ 381 case VCHR: 382 /* FALLTHROUGH */ 383 case VSOCK: 384 /* FALLTHROUGH */ 385 case VFIFO: 386 break; 387 388 default: 389 error = EINVAL; 390 goto out; 391 } 392 393 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 394 error = EPERM; 395 goto out; 396 } 397 398 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 399 node->tn_gid, mode, cred); 400 401 out: 402 KASSERT(VOP_ISLOCKED(vp)); 403 404 return error; 405 } 406 407 /* --------------------------------------------------------------------- */ 408 409 int 410 tmpfs_getattr(void *v) 411 { 412 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 413 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 414 415 struct tmpfs_node *node; 416 417 node = VP_TO_TMPFS_NODE(vp); 418 419 VATTR_NULL(vap); 420 421 tmpfs_itimes(vp, NULL, NULL); 422 423 vap->va_type = vp->v_type; 424 vap->va_mode = node->tn_mode; 425 vap->va_nlink = node->tn_links; 426 vap->va_uid = node->tn_uid; 427 vap->va_gid = node->tn_gid; 428 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 429 vap->va_fileid = node->tn_id; 430 vap->va_size = node->tn_size; 431 vap->va_blocksize = PAGE_SIZE; 432 vap->va_atime = node->tn_atime; 433 vap->va_mtime = node->tn_mtime; 434 vap->va_ctime = node->tn_ctime; 435 vap->va_birthtime = node->tn_birthtime; 436 vap->va_gen = node->tn_gen; 437 vap->va_flags = node->tn_flags; 438 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 439 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 440 vap->va_bytes = round_page(node->tn_size); 441 vap->va_filerev = VNOVAL; 442 vap->va_vaflags = 0; 443 vap->va_spare = VNOVAL; /* XXX */ 444 445 return 0; 446 } 447 448 /* --------------------------------------------------------------------- */ 449 450 /* XXX Should this operation be atomic? I think it should, but code in 451 * XXX other places (e.g., ufs) doesn't seem to be... */ 452 int 453 tmpfs_setattr(void *v) 454 { 455 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 456 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 457 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 458 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 459 460 int error; 461 462 KASSERT(VOP_ISLOCKED(vp)); 463 464 error = 0; 465 466 /* Abort if any unsettable attribute is given. */ 467 if (vap->va_type != VNON || 468 vap->va_nlink != VNOVAL || 469 vap->va_fsid != VNOVAL || 470 vap->va_fileid != VNOVAL || 471 vap->va_blocksize != VNOVAL || 472 vap->va_ctime.tv_sec != VNOVAL || 473 vap->va_ctime.tv_nsec != VNOVAL || 474 vap->va_birthtime.tv_sec != VNOVAL || 475 vap->va_birthtime.tv_nsec != VNOVAL || 476 vap->va_gen != VNOVAL || 477 vap->va_rdev != VNOVAL || 478 vap->va_bytes != VNOVAL) 479 error = EINVAL; 480 481 if (error == 0 && (vap->va_flags != VNOVAL)) 482 error = tmpfs_chflags(vp, vap->va_flags, cred, l->l_proc); 483 484 if (error == 0 && (vap->va_size != VNOVAL)) 485 error = tmpfs_chsize(vp, vap->va_size, cred, l->l_proc); 486 487 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 488 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, 489 l->l_proc); 490 491 if (error == 0 && (vap->va_mode != VNOVAL)) 492 error = tmpfs_chmod(vp, vap->va_mode, cred, l->l_proc); 493 494 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 495 vap->va_atime.tv_nsec != VNOVAL) || 496 (vap->va_mtime.tv_sec != VNOVAL && 497 vap->va_mtime.tv_nsec != VNOVAL))) 498 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 499 vap->va_vaflags, cred, l); 500 501 /* Update the node times. We give preference to the error codes 502 * generated by this function rather than the ones that may arise 503 * from tmpfs_update. */ 504 tmpfs_update(vp, NULL, NULL, 0); 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_spec.tn_reg.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, UVM_ADV_NORMAL, 555 UBC_READ); 556 error = uiomove(win, len, uio); 557 ubc_release(win, flags); 558 } 559 560 out: 561 KASSERT(VOP_ISLOCKED(vp)); 562 563 return error; 564 } 565 566 /* --------------------------------------------------------------------- */ 567 568 int 569 tmpfs_write(void *v) 570 { 571 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 572 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 573 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 574 575 boolean_t extended; 576 int error; 577 int flags; 578 off_t oldsize; 579 struct tmpfs_node *node; 580 struct uvm_object *uobj; 581 582 KASSERT(VOP_ISLOCKED(vp)); 583 584 node = VP_TO_TMPFS_NODE(vp); 585 oldsize = node->tn_size; 586 587 if (uio->uio_offset < 0 || vp->v_type != VREG) { 588 error = EINVAL; 589 goto out; 590 } 591 592 if (uio->uio_resid == 0) { 593 error = 0; 594 goto out; 595 } 596 597 if (ioflag & IO_APPEND) 598 uio->uio_offset = node->tn_size; 599 600 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 601 if (extended) { 602 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 603 if (error != 0) 604 goto out; 605 } 606 607 uobj = node->tn_spec.tn_reg.tn_aobj; 608 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 609 error = 0; 610 while (error == 0 && uio->uio_resid > 0) { 611 vsize_t len; 612 void *win; 613 614 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 615 if (len == 0) 616 break; 617 618 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 619 UBC_WRITE); 620 error = uiomove(win, len, uio); 621 ubc_release(win, flags); 622 } 623 624 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 625 (extended ? TMPFS_NODE_CHANGED : 0); 626 627 if (error != 0) 628 (void)tmpfs_reg_resize(vp, oldsize); 629 630 out: 631 KASSERT(VOP_ISLOCKED(vp)); 632 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 633 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 634 635 return error; 636 } 637 638 /* --------------------------------------------------------------------- */ 639 640 int 641 tmpfs_fsync(void *v) 642 { 643 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 644 645 KASSERT(VOP_ISLOCKED(vp)); 646 647 tmpfs_update(vp, NULL, NULL, 0); 648 649 return 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 tmpfs_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 tmpfs_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 /* If we need to move the directory between entries, lock the 853 * source so that we can safely operate on it. */ 854 if (fdnode != tdnode) { 855 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 856 if (error != 0) 857 goto out; 858 } 859 860 /* Ensure that we have enough memory to hold the new name, if it 861 * has to be changed. */ 862 if (fcnp->cn_namelen != tcnp->cn_namelen || 863 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 864 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 865 tcnp->cn_namelen, 0); 866 if (newname == NULL) { 867 error = ENOSPC; 868 goto out_locked; 869 } 870 } else 871 newname = NULL; 872 873 /* If the node is being moved to another directory, we have to do 874 * the move. */ 875 if (fdnode != tdnode) { 876 /* In case we are moving a directory, we have to adjust its 877 * parent to point to the new parent. */ 878 if (de->td_node->tn_type == VDIR) { 879 struct tmpfs_node *n; 880 881 /* Ensure the target directory is not a child of the 882 * directory being moved. Otherwise, we'd end up 883 * with stale nodes. */ 884 n = tdnode; 885 while (n != n->tn_spec.tn_dir.tn_parent) { 886 if (n == fnode) { 887 error = EINVAL; 888 goto out_locked; 889 } 890 n = n->tn_spec.tn_dir.tn_parent; 891 } 892 893 /* Adjust the parent pointer. */ 894 TMPFS_VALIDATE_DIR(fnode); 895 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 896 897 /* As a result of changing the target of the '..' 898 * entry, the link count of the source and target 899 * directories has to be adjusted. */ 900 fdnode->tn_links--; 901 tdnode->tn_links++; 902 } 903 904 /* Do the move: just remove the entry from the source directory 905 * and insert it into the target one. */ 906 tmpfs_dir_detach(fdvp, de); 907 tmpfs_dir_attach(tdvp, de); 908 909 /* Notify listeners of fdvp about the change in the directory. 910 * We can do it at this point because we aren't touching fdvp 911 * any more below. */ 912 VN_KNOTE(fdvp, NOTE_WRITE); 913 } 914 915 /* If the name has changed, we need to make it effective by changing 916 * it in the directory entry. */ 917 if (newname != NULL) { 918 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 919 KASSERT(tcnp->cn_namelen < 0xffff); 920 921 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 922 de->td_namelen); 923 de->td_namelen = (uint16_t)tcnp->cn_namelen; 924 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 925 de->td_name = newname; 926 927 fnode->tn_status |= TMPFS_NODE_MODIFIED; 928 } 929 930 /* If we are overwriting an entry, we have to remove the old one 931 * from the target directory. */ 932 if (tvp != NULL) { 933 struct tmpfs_node *tnode; 934 935 tnode = VP_TO_TMPFS_NODE(tvp); 936 937 /* The source node cannot be a directory in this case. */ 938 KASSERT(fnode->tn_type != VDIR); 939 940 /* Remove the old entry from the target directory. */ 941 de = tnode->tn_lookup_dirent; 942 tmpfs_dir_detach(tdvp, de); 943 944 /* Free the directory entry we just deleted. Note that the 945 * node referred by it will not be removed until the vnode is 946 * really reclaimed. */ 947 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 948 } 949 950 /* Notify listeners of tdvp about the change in the directory (either 951 * because a new entry was added or because one was removed). */ 952 VN_KNOTE(tdvp, NOTE_WRITE); 953 954 error = 0; 955 956 out_locked: 957 if (fdnode != tdnode) 958 VOP_UNLOCK(fdvp, 0); 959 960 out: 961 /* Release target nodes. */ 962 /* XXX: I don't understand when tdvp can be the same as tvp, but 963 * other code takes care of this... */ 964 if (tdvp == tvp) 965 vrele(tdvp); 966 else 967 vput(tdvp); 968 if (tvp != NULL) 969 vput(tvp); 970 971 /* Release source nodes. */ 972 vrele(fdvp); 973 vrele(fvp); 974 975 return error; 976 } 977 978 /* --------------------------------------------------------------------- */ 979 980 int 981 tmpfs_mkdir(void *v) 982 { 983 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 984 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 985 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 986 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 987 988 KASSERT(vap->va_type == VDIR); 989 990 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 991 } 992 993 /* --------------------------------------------------------------------- */ 994 995 int 996 tmpfs_rmdir(void *v) 997 { 998 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 999 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1000 1001 int error; 1002 struct tmpfs_dirent *de; 1003 struct tmpfs_mount *tmp; 1004 struct tmpfs_node *dnode; 1005 struct tmpfs_node *node; 1006 1007 KASSERT(VOP_ISLOCKED(dvp)); 1008 KASSERT(VOP_ISLOCKED(vp)); 1009 1010 tmp = VFS_TO_TMPFS(dvp->v_mount); 1011 dnode = VP_TO_TMPFS_DIR(dvp); 1012 node = VP_TO_TMPFS_DIR(vp); 1013 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1014 1015 /* Get the directory entry associated with node (vp). This was 1016 * filled by tmpfs_lookup while looking up the entry. */ 1017 de = node->tn_lookup_dirent; 1018 KASSERT(TMPFS_DIRENT_MATCHES(de, 1019 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1020 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1021 1022 /* Directories with more than two entries ('.' and '..') cannot be 1023 * removed. */ 1024 if (node->tn_size > 0) { 1025 error = ENOTEMPTY; 1026 goto out; 1027 } 1028 1029 /* Check flags to see if we are allowed to remove the directory. */ 1030 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1031 error = EPERM; 1032 goto out; 1033 } 1034 1035 /* Detach the directory entry from the directory (dnode). */ 1036 tmpfs_dir_detach(dvp, de); 1037 1038 node->tn_links--; 1039 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1040 TMPFS_NODE_MODIFIED; 1041 node->tn_spec.tn_dir.tn_parent->tn_links--; 1042 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1043 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1044 1045 /* Notify modification of parent directory and release it. */ 1046 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1047 cache_purge(dvp); /* XXX Is this needed? */ 1048 vput(dvp); 1049 1050 /* Free the directory entry we just deleted. Note that the node 1051 * referred by it will not be removed until the vnode is really 1052 * reclaimed. */ 1053 tmpfs_free_dirent(tmp, de, TRUE); 1054 1055 /* Release the deleted vnode (will destroy the node, notify 1056 * interested parties and clean it from the cache). */ 1057 vput(vp); 1058 1059 error = 0; 1060 1061 out: 1062 if (error != 0) { 1063 vput(dvp); 1064 vput(vp); 1065 } 1066 1067 return error; 1068 } 1069 1070 /* --------------------------------------------------------------------- */ 1071 1072 int 1073 tmpfs_symlink(void *v) 1074 { 1075 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1076 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1077 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1078 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1079 char *target = ((struct vop_symlink_args *)v)->a_target; 1080 1081 KASSERT(vap->va_type == VLNK); 1082 1083 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1084 } 1085 1086 /* --------------------------------------------------------------------- */ 1087 1088 int 1089 tmpfs_readdir(void *v) 1090 { 1091 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1092 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1093 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1094 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1095 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1096 1097 int error; 1098 off_t startoff; 1099 off_t cnt; 1100 struct tmpfs_node *node; 1101 1102 KASSERT(VOP_ISLOCKED(vp)); 1103 1104 /* This operation only makes sense on directory nodes. */ 1105 if (vp->v_type != VDIR) { 1106 error = ENOTDIR; 1107 goto out; 1108 } 1109 1110 node = VP_TO_TMPFS_DIR(vp); 1111 1112 startoff = uio->uio_offset; 1113 1114 cnt = 0; 1115 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1116 error = tmpfs_dir_getdotdent(node, uio); 1117 if (error == -1) { 1118 error = 0; 1119 goto outok; 1120 } else if (error != 0) 1121 goto outok; 1122 cnt++; 1123 } 1124 1125 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 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 cnt++; 1133 } 1134 1135 error = tmpfs_dir_getdents(node, uio, &cnt); 1136 if (error == -1) 1137 error = 0; 1138 KASSERT(error >= 0); 1139 1140 outok: 1141 /* This label assumes that startoff has been 1142 * initialized. If the compiler didn't spit out warnings, we'd 1143 * simply make this one be 'out' and drop 'outok'. */ 1144 1145 if (eofflag != NULL) 1146 *eofflag = 1147 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1148 1149 /* Update NFS-related variables. */ 1150 if (error == 0 && cookies != NULL && ncookies != NULL) { 1151 off_t i; 1152 off_t off = startoff; 1153 struct tmpfs_dirent *de = NULL; 1154 1155 *ncookies = cnt; 1156 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1157 1158 for (i = 0; i < cnt; i++) { 1159 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1160 if (off == TMPFS_DIRCOOKIE_DOT) { 1161 off = TMPFS_DIRCOOKIE_DOTDOT; 1162 } else { 1163 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1164 de = TAILQ_FIRST(&node->tn_spec. 1165 tn_dir.tn_dir); 1166 } else if (de != NULL) { 1167 de = TAILQ_NEXT(de, td_entries); 1168 } else { 1169 de = tmpfs_dir_lookupbycookie(node, 1170 off); 1171 KASSERT(de != NULL); 1172 de = TAILQ_NEXT(de, td_entries); 1173 } 1174 if (de == NULL) { 1175 off = TMPFS_DIRCOOKIE_EOF; 1176 } else { 1177 off = TMPFS_DIRCOOKIE(de); 1178 } 1179 } 1180 1181 (*cookies)[i] = off; 1182 } 1183 KASSERT(uio->uio_offset == off); 1184 } 1185 1186 out: 1187 KASSERT(VOP_ISLOCKED(vp)); 1188 1189 return error; 1190 } 1191 1192 /* --------------------------------------------------------------------- */ 1193 1194 int 1195 tmpfs_readlink(void *v) 1196 { 1197 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1198 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1199 1200 int error; 1201 struct tmpfs_node *node; 1202 1203 KASSERT(VOP_ISLOCKED(vp)); 1204 KASSERT(uio->uio_offset == 0); 1205 KASSERT(vp->v_type == VLNK); 1206 1207 node = VP_TO_TMPFS_NODE(vp); 1208 1209 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1210 MIN(node->tn_size, uio->uio_resid), uio); 1211 node->tn_status |= TMPFS_NODE_ACCESSED; 1212 1213 KASSERT(VOP_ISLOCKED(vp)); 1214 1215 return error; 1216 } 1217 1218 /* --------------------------------------------------------------------- */ 1219 1220 int 1221 tmpfs_inactive(void *v) 1222 { 1223 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1224 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1225 1226 struct tmpfs_node *node; 1227 1228 KASSERT(VOP_ISLOCKED(vp)); 1229 1230 node = VP_TO_TMPFS_NODE(vp); 1231 1232 VOP_UNLOCK(vp, 0); 1233 1234 if (node->tn_links == 0) 1235 vrecycle(vp, NULL, l); 1236 1237 return 0; 1238 } 1239 1240 /* --------------------------------------------------------------------- */ 1241 1242 int 1243 tmpfs_reclaim(void *v) 1244 { 1245 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1246 1247 struct tmpfs_mount *tmp; 1248 struct tmpfs_node *node; 1249 1250 KASSERT(!VOP_ISLOCKED(vp)); 1251 1252 node = VP_TO_TMPFS_NODE(vp); 1253 tmp = VFS_TO_TMPFS(vp->v_mount); 1254 1255 if (node->tn_links == 0) 1256 VN_KNOTE(vp, NOTE_DELETE); 1257 1258 cache_purge(vp); 1259 tmpfs_free_vp(vp); 1260 1261 /* If the node referenced by this vnode was deleted by the user, 1262 * we must free its associated data structures (now that the vnode 1263 * is being reclaimed). */ 1264 if (node->tn_links == 0) 1265 tmpfs_free_node(tmp, node); 1266 1267 KASSERT(!VOP_ISLOCKED(vp)); 1268 KASSERT(vp->v_data == NULL); 1269 1270 return 0; 1271 } 1272 1273 /* --------------------------------------------------------------------- */ 1274 1275 int 1276 tmpfs_print(void *v) 1277 { 1278 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1279 1280 struct tmpfs_node *node; 1281 1282 node = VP_TO_TMPFS_NODE(vp); 1283 1284 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1285 node, node->tn_flags, node->tn_links); 1286 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1287 ", status 0x%x\n", 1288 node->tn_mode, node->tn_uid, node->tn_gid, 1289 (uintmax_t)node->tn_size, node->tn_status); 1290 1291 if (vp->v_type == VFIFO) 1292 fifo_printinfo(vp); 1293 lockmgr_printinfo(&vp->v_lock); 1294 1295 printf("\n"); 1296 1297 return 0; 1298 } 1299 1300 /* --------------------------------------------------------------------- */ 1301 1302 int 1303 tmpfs_pathconf(void *v) 1304 { 1305 int name = ((struct vop_pathconf_args *)v)->a_name; 1306 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1307 1308 int error; 1309 1310 error = 0; 1311 1312 switch (name) { 1313 case _PC_LINK_MAX: 1314 *retval = LINK_MAX; 1315 break; 1316 1317 case _PC_NAME_MAX: 1318 *retval = NAME_MAX; 1319 break; 1320 1321 case _PC_PATH_MAX: 1322 *retval = PATH_MAX; 1323 break; 1324 1325 case _PC_PIPE_BUF: 1326 *retval = PIPE_BUF; 1327 break; 1328 1329 case _PC_CHOWN_RESTRICTED: 1330 *retval = 1; 1331 break; 1332 1333 case _PC_NO_TRUNC: 1334 *retval = 1; 1335 break; 1336 1337 case _PC_SYNC_IO: 1338 *retval = 1; 1339 break; 1340 1341 case _PC_FILESIZEBITS: 1342 *retval = 0; /* XXX Don't know which value should I return. */ 1343 break; 1344 1345 default: 1346 error = EINVAL; 1347 } 1348 1349 return error; 1350 } 1351 1352 /* --------------------------------------------------------------------- */ 1353 1354 int 1355 tmpfs_advlock(void *v) 1356 { 1357 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1358 1359 struct tmpfs_node *node; 1360 1361 node = VP_TO_TMPFS_NODE(vp); 1362 1363 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1364 } 1365 1366 /* --------------------------------------------------------------------- */ 1367 1368 int 1369 tmpfs_getpages(void *v) 1370 { 1371 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1372 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1373 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1374 int *count = ((struct vop_getpages_args *)v)->a_count; 1375 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1376 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1377 int advice = ((struct vop_getpages_args *)v)->a_advice; 1378 int flags = ((struct vop_getpages_args *)v)->a_flags; 1379 1380 int error; 1381 struct tmpfs_node *node; 1382 struct uvm_object *uobj; 1383 int npages = *count; 1384 1385 KASSERT(vp->v_type == VREG); 1386 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1387 1388 node = VP_TO_TMPFS_NODE(vp); 1389 uobj = node->tn_spec.tn_reg.tn_aobj; 1390 1391 /* We currently don't rely on PGO_PASTEOF. */ 1392 1393 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1394 if ((flags & PGO_LOCKED) == 0) 1395 simple_unlock(&vp->v_interlock); 1396 return EINVAL; 1397 } 1398 1399 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1400 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1401 } 1402 1403 if ((flags & PGO_LOCKED) != 0) 1404 return EBUSY; 1405 1406 if ((flags & PGO_NOTIMESTAMP) == 0) { 1407 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1408 node->tn_status |= TMPFS_NODE_ACCESSED; 1409 1410 if ((access_type & VM_PROT_WRITE) != 0) 1411 node->tn_status |= TMPFS_NODE_MODIFIED; 1412 } 1413 1414 simple_unlock(&vp->v_interlock); 1415 1416 simple_lock(&uobj->vmobjlock); 1417 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1418 access_type, advice, flags); 1419 1420 return error; 1421 } 1422 1423 /* --------------------------------------------------------------------- */ 1424 1425 int 1426 tmpfs_putpages(void *v) 1427 { 1428 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1429 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1430 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1431 int flags = ((struct vop_putpages_args *)v)->a_flags; 1432 1433 int error; 1434 struct tmpfs_node *node; 1435 struct uvm_object *uobj; 1436 1437 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1438 1439 node = VP_TO_TMPFS_NODE(vp); 1440 1441 if (vp->v_type != VREG) { 1442 simple_unlock(&vp->v_interlock); 1443 return 0; 1444 } 1445 1446 uobj = node->tn_spec.tn_reg.tn_aobj; 1447 simple_unlock(&vp->v_interlock); 1448 1449 simple_lock(&uobj->vmobjlock); 1450 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1451 1452 /* XXX mtime */ 1453 1454 return error; 1455 } 1456
Indexes created Wed Sep 24 05:09:52 GMT 2025