tmpfs_vnops.c revision 1.49
1 /* $NetBSD: tmpfs_vnops.c,v 1.49 2008/02/06 11:22:12 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 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 1.49 2008/02/06 11:22:12 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 #include <sys/kauth.h> 60 61 #include <uvm/uvm.h> 62 63 #include <miscfs/fifofs/fifo.h> 64 #include <fs/tmpfs/tmpfs_vnops.h> 65 #include <fs/tmpfs/tmpfs.h> 66 67 /* --------------------------------------------------------------------- */ 68 69 /* 70 * vnode operations vector used for files stored in a tmpfs file system. 71 */ 72 int (**tmpfs_vnodeop_p)(void *); 73 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 74 { &vop_default_desc, vn_default_error }, 75 { &vop_lookup_desc, tmpfs_lookup }, 76 { &vop_create_desc, tmpfs_create }, 77 { &vop_mknod_desc, tmpfs_mknod }, 78 { &vop_open_desc, tmpfs_open }, 79 { &vop_close_desc, tmpfs_close }, 80 { &vop_access_desc, tmpfs_access }, 81 { &vop_getattr_desc, tmpfs_getattr }, 82 { &vop_setattr_desc, tmpfs_setattr }, 83 { &vop_read_desc, tmpfs_read }, 84 { &vop_write_desc, tmpfs_write }, 85 { &vop_ioctl_desc, tmpfs_ioctl }, 86 { &vop_fcntl_desc, tmpfs_fcntl }, 87 { &vop_poll_desc, tmpfs_poll }, 88 { &vop_kqfilter_desc, tmpfs_kqfilter }, 89 { &vop_revoke_desc, tmpfs_revoke }, 90 { &vop_mmap_desc, tmpfs_mmap }, 91 { &vop_fsync_desc, tmpfs_fsync }, 92 { &vop_seek_desc, tmpfs_seek }, 93 { &vop_remove_desc, tmpfs_remove }, 94 { &vop_link_desc, tmpfs_link }, 95 { &vop_rename_desc, tmpfs_rename }, 96 { &vop_mkdir_desc, tmpfs_mkdir }, 97 { &vop_rmdir_desc, tmpfs_rmdir }, 98 { &vop_symlink_desc, tmpfs_symlink }, 99 { &vop_readdir_desc, tmpfs_readdir }, 100 { &vop_readlink_desc, tmpfs_readlink }, 101 { &vop_abortop_desc, tmpfs_abortop }, 102 { &vop_inactive_desc, tmpfs_inactive }, 103 { &vop_reclaim_desc, tmpfs_reclaim }, 104 { &vop_lock_desc, tmpfs_lock }, 105 { &vop_unlock_desc, tmpfs_unlock }, 106 { &vop_bmap_desc, tmpfs_bmap }, 107 { &vop_strategy_desc, tmpfs_strategy }, 108 { &vop_print_desc, tmpfs_print }, 109 { &vop_pathconf_desc, tmpfs_pathconf }, 110 { &vop_islocked_desc, tmpfs_islocked }, 111 { &vop_advlock_desc, tmpfs_advlock }, 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); 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 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 171 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 172 VREF(dvp); 173 *vpp = dvp; 174 error = 0; 175 } else { 176 de = tmpfs_dir_lookup(dnode, cnp); 177 if (de == NULL) { 178 /* The entry was not found in the directory. 179 * This is OK iff we are creating or renaming an 180 * entry and are working on the last component of 181 * the path name. */ 182 if ((cnp->cn_flags & ISLASTCN) && 183 (cnp->cn_nameiop == CREATE || \ 184 cnp->cn_nameiop == RENAME)) { 185 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 186 if (error != 0) 187 goto out; 188 189 /* Keep the component name in the buffer for 190 * future uses. */ 191 cnp->cn_flags |= SAVENAME; 192 193 error = EJUSTRETURN; 194 } else 195 error = ENOENT; 196 } else { 197 struct tmpfs_node *tnode; 198 199 /* The entry was found, so get its associated 200 * tmpfs_node. */ 201 tnode = de->td_node; 202 203 /* If we are not at the last path component and 204 * found a non-directory or non-link entry (which 205 * may itself be pointing to a directory), raise 206 * an error. */ 207 if ((tnode->tn_type != VDIR && 208 tnode->tn_type != VLNK) && 209 !(cnp->cn_flags & ISLASTCN)) { 210 error = ENOTDIR; 211 goto out; 212 } 213 214 /* If we are deleting or renaming the entry, keep 215 * track of its tmpfs_dirent so that it can be 216 * easily deleted later. */ 217 if ((cnp->cn_flags & ISLASTCN) && 218 (cnp->cn_nameiop == DELETE || 219 cnp->cn_nameiop == RENAME)) { 220 if ((dnode->tn_mode & S_ISTXT) != 0 && 221 kauth_authorize_generic(cnp->cn_cred, 222 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 223 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 224 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 225 return EPERM; 226 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 227 if (error != 0) 228 goto out; 229 } else 230 de = NULL; 231 232 /* Allocate a new vnode on the matching entry. */ 233 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 234 } 235 } 236 237 /* Store the result of this lookup in the cache. Avoid this if the 238 * request was for creation, as it does not improve timings on 239 * emprical tests. */ 240 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 241 (cnp->cn_flags & ISDOTDOT) == 0) 242 cache_enter(dvp, *vpp, cnp); 243 244 out: 245 /* If there were no errors, *vpp cannot be null and it must be 246 * locked. */ 247 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 248 249 /* dvp must always be locked. */ 250 KASSERT(VOP_ISLOCKED(dvp)); 251 252 return error; 253 } 254 255 /* --------------------------------------------------------------------- */ 256 257 int 258 tmpfs_create(void *v) 259 { 260 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 261 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 262 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 263 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 264 265 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 266 267 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 268 } 269 /* --------------------------------------------------------------------- */ 270 271 int 272 tmpfs_mknod(void *v) 273 { 274 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 275 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 276 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 277 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 278 279 if (vap->va_type != VBLK && vap->va_type != VCHR && 280 vap->va_type != VFIFO) 281 return EINVAL; 282 283 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 284 } 285 286 /* --------------------------------------------------------------------- */ 287 288 int 289 tmpfs_open(void *v) 290 { 291 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 292 int mode = ((struct vop_open_args *)v)->a_mode; 293 294 int error; 295 struct tmpfs_node *node; 296 297 KASSERT(VOP_ISLOCKED(vp)); 298 299 node = VP_TO_TMPFS_NODE(vp); 300 301 /* The file is still active but all its names have been removed 302 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 303 * it is about to die. */ 304 if (node->tn_links < 1) { 305 error = ENOENT; 306 goto out; 307 } 308 309 /* If the file is marked append-only, deny write requests. */ 310 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 311 error = EPERM; 312 else 313 error = 0; 314 315 out: 316 KASSERT(VOP_ISLOCKED(vp)); 317 318 return error; 319 } 320 321 /* --------------------------------------------------------------------- */ 322 323 int 324 tmpfs_close(void *v) 325 { 326 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 327 328 struct tmpfs_node *node; 329 330 KASSERT(VOP_ISLOCKED(vp)); 331 332 node = VP_TO_TMPFS_NODE(vp); 333 334 if (node->tn_links > 0) { 335 /* Update node times. No need to do it if the node has 336 * been deleted, because it will vanish after we return. */ 337 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 338 } 339 340 return 0; 341 } 342 343 /* --------------------------------------------------------------------- */ 344 345 int 346 tmpfs_access(void *v) 347 { 348 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 349 int mode = ((struct vop_access_args *)v)->a_mode; 350 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 351 352 int error; 353 struct tmpfs_node *node; 354 355 KASSERT(VOP_ISLOCKED(vp)); 356 357 node = VP_TO_TMPFS_NODE(vp); 358 359 switch (vp->v_type) { 360 case VDIR: 361 /* FALLTHROUGH */ 362 case VLNK: 363 /* FALLTHROUGH */ 364 case VREG: 365 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 366 error = EROFS; 367 goto out; 368 } 369 break; 370 371 case VBLK: 372 /* FALLTHROUGH */ 373 case VCHR: 374 /* FALLTHROUGH */ 375 case VSOCK: 376 /* FALLTHROUGH */ 377 case VFIFO: 378 break; 379 380 default: 381 error = EINVAL; 382 goto out; 383 } 384 385 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 386 error = EPERM; 387 goto out; 388 } 389 390 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 391 node->tn_gid, mode, cred); 392 393 out: 394 KASSERT(VOP_ISLOCKED(vp)); 395 396 return error; 397 } 398 399 /* --------------------------------------------------------------------- */ 400 401 int 402 tmpfs_getattr(void *v) 403 { 404 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 405 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 406 407 struct tmpfs_node *node; 408 409 node = VP_TO_TMPFS_NODE(vp); 410 411 VATTR_NULL(vap); 412 413 tmpfs_itimes(vp, NULL, NULL); 414 415 vap->va_type = vp->v_type; 416 vap->va_mode = node->tn_mode; 417 vap->va_nlink = node->tn_links; 418 vap->va_uid = node->tn_uid; 419 vap->va_gid = node->tn_gid; 420 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 421 vap->va_fileid = node->tn_id; 422 vap->va_size = node->tn_size; 423 vap->va_blocksize = PAGE_SIZE; 424 vap->va_atime = node->tn_atime; 425 vap->va_mtime = node->tn_mtime; 426 vap->va_ctime = node->tn_ctime; 427 vap->va_birthtime = node->tn_birthtime; 428 vap->va_gen = node->tn_gen; 429 vap->va_flags = node->tn_flags; 430 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 431 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 432 vap->va_bytes = round_page(node->tn_size); 433 vap->va_filerev = VNOVAL; 434 vap->va_vaflags = 0; 435 vap->va_spare = VNOVAL; /* XXX */ 436 437 return 0; 438 } 439 440 /* --------------------------------------------------------------------- */ 441 442 /* XXX Should this operation be atomic? I think it should, but code in 443 * XXX other places (e.g., ufs) doesn't seem to be... */ 444 int 445 tmpfs_setattr(void *v) 446 { 447 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 448 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 449 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 450 struct lwp *l = curlwp; 451 452 int error; 453 454 KASSERT(VOP_ISLOCKED(vp)); 455 456 error = 0; 457 458 /* Abort if any unsettable attribute is given. */ 459 if (vap->va_type != VNON || 460 vap->va_nlink != VNOVAL || 461 vap->va_fsid != VNOVAL || 462 vap->va_fileid != VNOVAL || 463 vap->va_blocksize != VNOVAL || 464 vap->va_ctime.tv_sec != VNOVAL || 465 vap->va_ctime.tv_nsec != VNOVAL || 466 vap->va_birthtime.tv_sec != VNOVAL || 467 vap->va_birthtime.tv_nsec != VNOVAL || 468 vap->va_gen != VNOVAL || 469 vap->va_rdev != VNOVAL || 470 vap->va_bytes != VNOVAL) 471 error = EINVAL; 472 473 if (error == 0 && (vap->va_flags != VNOVAL)) 474 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 475 476 if (error == 0 && (vap->va_size != VNOVAL)) 477 error = tmpfs_chsize(vp, vap->va_size, cred, l); 478 479 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 480 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 481 482 if (error == 0 && (vap->va_mode != VNOVAL)) 483 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 484 485 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 486 vap->va_atime.tv_nsec != VNOVAL) || 487 (vap->va_mtime.tv_sec != VNOVAL && 488 vap->va_mtime.tv_nsec != VNOVAL))) 489 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 490 vap->va_vaflags, cred, l); 491 492 /* Update the node times. We give preference to the error codes 493 * generated by this function rather than the ones that may arise 494 * from tmpfs_update. */ 495 tmpfs_update(vp, NULL, NULL, 0); 496 497 KASSERT(VOP_ISLOCKED(vp)); 498 499 return error; 500 } 501 502 /* --------------------------------------------------------------------- */ 503 504 int 505 tmpfs_read(void *v) 506 { 507 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 508 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 509 510 int error; 511 int flags; 512 struct tmpfs_node *node; 513 struct uvm_object *uobj; 514 515 KASSERT(VOP_ISLOCKED(vp)); 516 517 node = VP_TO_TMPFS_NODE(vp); 518 519 if (vp->v_type != VREG) { 520 error = EISDIR; 521 goto out; 522 } 523 524 if (uio->uio_offset < 0) { 525 error = EINVAL; 526 goto out; 527 } 528 529 node->tn_status |= TMPFS_NODE_ACCESSED; 530 531 uobj = node->tn_spec.tn_reg.tn_aobj; 532 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 533 error = 0; 534 while (error == 0 && uio->uio_resid > 0) { 535 vsize_t len; 536 void *win; 537 538 if (node->tn_size <= uio->uio_offset) 539 break; 540 541 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 542 if (len == 0) 543 break; 544 545 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 546 UBC_READ); 547 error = uiomove(win, len, uio); 548 ubc_release(win, flags); 549 } 550 551 out: 552 KASSERT(VOP_ISLOCKED(vp)); 553 554 return error; 555 } 556 557 /* --------------------------------------------------------------------- */ 558 559 int 560 tmpfs_write(void *v) 561 { 562 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 563 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 564 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 565 566 bool extended; 567 int error; 568 int flags; 569 off_t oldsize; 570 struct tmpfs_node *node; 571 struct uvm_object *uobj; 572 573 KASSERT(VOP_ISLOCKED(vp)); 574 575 node = VP_TO_TMPFS_NODE(vp); 576 oldsize = node->tn_size; 577 578 if (uio->uio_offset < 0 || vp->v_type != VREG) { 579 error = EINVAL; 580 goto out; 581 } 582 583 if (uio->uio_resid == 0) { 584 error = 0; 585 goto out; 586 } 587 588 if (ioflag & IO_APPEND) 589 uio->uio_offset = node->tn_size; 590 591 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 592 if (extended) { 593 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 594 if (error != 0) 595 goto out; 596 } 597 598 uobj = node->tn_spec.tn_reg.tn_aobj; 599 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 600 error = 0; 601 while (error == 0 && uio->uio_resid > 0) { 602 vsize_t len; 603 void *win; 604 605 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 606 if (len == 0) 607 break; 608 609 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 610 UBC_WRITE); 611 error = uiomove(win, len, uio); 612 ubc_release(win, flags); 613 } 614 615 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 616 (extended ? TMPFS_NODE_CHANGED : 0); 617 618 if (error != 0) 619 (void)tmpfs_reg_resize(vp, oldsize); 620 621 VN_KNOTE(vp, NOTE_WRITE); 622 623 out: 624 KASSERT(VOP_ISLOCKED(vp)); 625 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 626 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 627 628 return error; 629 } 630 631 /* --------------------------------------------------------------------- */ 632 633 int 634 tmpfs_fsync(void *v) 635 { 636 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 637 638 KASSERT(VOP_ISLOCKED(vp)); 639 640 tmpfs_update(vp, NULL, NULL, 0); 641 642 return 0; 643 } 644 645 /* --------------------------------------------------------------------- */ 646 647 int 648 tmpfs_remove(void *v) 649 { 650 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 651 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 652 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 653 654 int error; 655 struct tmpfs_dirent *de; 656 struct tmpfs_mount *tmp; 657 struct tmpfs_node *dnode; 658 struct tmpfs_node *node; 659 660 KASSERT(VOP_ISLOCKED(dvp)); 661 KASSERT(VOP_ISLOCKED(vp)); 662 663 if (vp->v_type == VDIR) { 664 error = EPERM; 665 goto out; 666 } 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 = tmpfs_dir_lookup(dnode, cnp); 672 if (de == NULL) { 673 error = ENOENT; 674 goto out; 675 } 676 KASSERT(de->td_node == node); 677 678 /* Files marked as immutable or append-only cannot be deleted. */ 679 if (node->tn_flags & (IMMUTABLE | APPEND)) { 680 error = EPERM; 681 goto out; 682 } 683 684 /* Remove the entry from the directory; as it is a file, we do not 685 * have to change the number of hard links of the directory. */ 686 tmpfs_dir_detach(dvp, de); 687 688 /* Free the directory entry we just deleted. Note that the node 689 * referred by it will not be removed until the vnode is really 690 * reclaimed. */ 691 tmpfs_free_dirent(tmp, de, true); 692 693 error = 0; 694 695 out: 696 vput(vp); 697 if (dvp == vp) 698 vrele(dvp); 699 else 700 vput(dvp); 701 702 return error; 703 } 704 705 /* --------------------------------------------------------------------- */ 706 707 int 708 tmpfs_link(void *v) 709 { 710 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 711 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 712 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 713 714 int error; 715 struct tmpfs_dirent *de; 716 struct tmpfs_node *dnode; 717 struct tmpfs_node *node; 718 719 KASSERT(VOP_ISLOCKED(dvp)); 720 KASSERT(cnp->cn_flags & HASBUF); 721 KASSERT(dvp != vp); /* XXX When can this be false? */ 722 723 dnode = VP_TO_TMPFS_DIR(dvp); 724 node = VP_TO_TMPFS_NODE(vp); 725 726 /* Lock vp because we will need to run tmpfs_update over it, which 727 * needs the vnode to be locked. */ 728 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 729 if (error != 0) 730 goto out1; 731 732 /* XXX: Why aren't the following two tests done by the caller? */ 733 734 /* Hard links of directories are forbidden. */ 735 if (vp->v_type == VDIR) { 736 error = EPERM; 737 goto out; 738 } 739 740 /* Cannot create cross-device links. */ 741 if (dvp->v_mount != vp->v_mount) { 742 error = EXDEV; 743 goto out; 744 } 745 746 /* Ensure that we do not overflow the maximum number of links imposed 747 * by the system. */ 748 KASSERT(node->tn_links <= LINK_MAX); 749 if (node->tn_links == LINK_MAX) { 750 error = EMLINK; 751 goto out; 752 } 753 754 /* We cannot create links of files marked immutable or append-only. */ 755 if (node->tn_flags & (IMMUTABLE | APPEND)) { 756 error = EPERM; 757 goto out; 758 } 759 760 /* Allocate a new directory entry to represent the node. */ 761 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 762 cnp->cn_nameptr, cnp->cn_namelen, &de); 763 if (error != 0) 764 goto out; 765 766 /* Insert the new directory entry into the appropriate directory. */ 767 tmpfs_dir_attach(dvp, de); 768 769 /* vp link count has changed, so update node times. */ 770 node->tn_status |= TMPFS_NODE_CHANGED; 771 tmpfs_update(vp, NULL, NULL, 0); 772 773 error = 0; 774 775 out: 776 VOP_UNLOCK(vp, 0); 777 out1: 778 PNBUF_PUT(cnp->cn_pnbuf); 779 780 vput(dvp); 781 782 return error; 783 } 784 785 /* --------------------------------------------------------------------- */ 786 787 int 788 tmpfs_rename(void *v) 789 { 790 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 791 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 792 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 793 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 794 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 795 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 796 797 char *newname; 798 int error; 799 struct tmpfs_dirent *de, *de2; 800 struct tmpfs_mount *tmp; 801 struct tmpfs_node *fdnode; 802 struct tmpfs_node *fnode; 803 struct tmpfs_node *tnode; 804 struct tmpfs_node *tdnode; 805 size_t namelen; 806 807 KASSERT(VOP_ISLOCKED(tdvp)); 808 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 809 KASSERT(fcnp->cn_flags & HASBUF); 810 KASSERT(tcnp->cn_flags & HASBUF); 811 812 newname = NULL; 813 namelen = 0; 814 tmp = NULL; 815 816 /* Disallow cross-device renames. */ 817 if (fvp->v_mount != tdvp->v_mount || 818 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 819 error = EXDEV; 820 goto out_unlocked; 821 } 822 823 fnode = VP_TO_TMPFS_NODE(fvp); 824 fdnode = VP_TO_TMPFS_DIR(fdvp); 825 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 826 tdnode = VP_TO_TMPFS_DIR(tdvp); 827 tmp = VFS_TO_TMPFS(tdvp->v_mount); 828 829 /* If we need to move the directory between entries, lock the 830 * source so that we can safely operate on it. */ 831 832 /* XXX: this is a potential locking order violation! */ 833 if (fdnode != tdnode) { 834 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 835 if (error != 0) 836 goto out_unlocked; 837 } 838 839 de = tmpfs_dir_lookup(fdnode, fcnp); 840 if (de == NULL) { 841 error = ENOENT; 842 goto out; 843 } 844 KASSERT(de->td_node == fnode); 845 846 /* If source and target are the same file, there is nothing to do. */ 847 if (fvp == tvp) { 848 error = 0; 849 goto out; 850 } 851 852 /* Avoid manipulating '.' and '..' entries. */ 853 if (de == NULL) { 854 KASSERT(fvp->v_type == VDIR); 855 error = EINVAL; 856 goto out; 857 } 858 KASSERT(de->td_node == fnode); 859 860 /* If replacing an existing entry, ensure we can do the operation. */ 861 if (tvp != NULL) { 862 KASSERT(tnode != NULL); 863 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 864 if (tnode->tn_size > 0) { 865 error = ENOTEMPTY; 866 goto out; 867 } 868 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 869 error = ENOTDIR; 870 goto out; 871 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 872 error = EISDIR; 873 goto out; 874 } else { 875 KASSERT(fnode->tn_type != VDIR && 876 tnode->tn_type != VDIR); 877 } 878 } 879 880 /* Ensure that we have enough memory to hold the new name, if it 881 * has to be changed. */ 882 namelen = tcnp->cn_namelen; 883 if (fcnp->cn_namelen != tcnp->cn_namelen || 884 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 885 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 886 if (newname == NULL) { 887 error = ENOSPC; 888 goto out; 889 } 890 } 891 892 /* If the node is being moved to another directory, we have to do 893 * the move. */ 894 if (fdnode != tdnode) { 895 /* In case we are moving a directory, we have to adjust its 896 * parent to point to the new parent. */ 897 if (de->td_node->tn_type == VDIR) { 898 struct tmpfs_node *n; 899 900 /* Ensure the target directory is not a child of the 901 * directory being moved. Otherwise, we'd end up 902 * with stale nodes. */ 903 n = tdnode; 904 while (n != n->tn_spec.tn_dir.tn_parent) { 905 if (n == fnode) { 906 error = EINVAL; 907 goto out; 908 } 909 n = n->tn_spec.tn_dir.tn_parent; 910 } 911 912 /* Adjust the parent pointer. */ 913 TMPFS_VALIDATE_DIR(fnode); 914 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 915 916 /* As a result of changing the target of the '..' 917 * entry, the link count of the source and target 918 * directories has to be adjusted. */ 919 fdnode->tn_links--; 920 tdnode->tn_links++; 921 } 922 923 /* Do the move: just remove the entry from the source directory 924 * and insert it into the target one. */ 925 tmpfs_dir_detach(fdvp, de); 926 tmpfs_dir_attach(tdvp, de); 927 928 /* Notify listeners of fdvp about the change in the directory. 929 * We can do it at this point because we aren't touching fdvp 930 * any more below. */ 931 VN_KNOTE(fdvp, NOTE_WRITE); 932 } 933 934 /* If we are overwriting an entry, we have to remove the old one 935 * from the target directory. */ 936 if (tvp != NULL) { 937 KASSERT(tnode != NULL); 938 939 /* Remove the old entry from the target directory. 940 * Note! This relies on tmpfs_dir_attach() putting the new 941 * node on the end of the target's node list. */ 942 de2 = tmpfs_dir_lookup(tdnode, tcnp); 943 KASSERT(de2 != NULL); 944 KASSERT(de2->td_node == tnode); 945 tmpfs_dir_detach(tdvp, de2); 946 947 /* Free the directory entry we just deleted. Note that the 948 * node referred by it will not be removed until the vnode is 949 * really reclaimed. */ 950 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 951 } 952 953 /* If the name has changed, we need to make it effective by changing 954 * it in the directory entry. */ 955 if (newname != NULL) { 956 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 957 KASSERT(tcnp->cn_namelen < 0xffff); 958 959 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 960 de->td_namelen); 961 de->td_namelen = (uint16_t)namelen; 962 memcpy(newname, tcnp->cn_nameptr, namelen); 963 de->td_name = newname; 964 newname = NULL; 965 966 fnode->tn_status |= TMPFS_NODE_CHANGED; 967 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 968 } 969 970 /* Notify listeners of tdvp about the change in the directory (either 971 * because a new entry was added or because one was removed) and 972 * listeners of fvp about the rename. */ 973 VN_KNOTE(tdvp, NOTE_WRITE); 974 VN_KNOTE(fvp, NOTE_RENAME); 975 976 error = 0; 977 978 out: 979 if (fdnode != tdnode) 980 VOP_UNLOCK(fdvp, 0); 981 982 out_unlocked: 983 /* Release target nodes. */ 984 if (tdvp == tvp) 985 vrele(tdvp); 986 else 987 vput(tdvp); 988 if (tvp != NULL) 989 vput(tvp); 990 991 /* Release source nodes. */ 992 vrele(fdvp); 993 vrele(fvp); 994 995 if (newname != NULL) 996 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 997 998 return error; 999 } 1000 1001 /* --------------------------------------------------------------------- */ 1002 1003 int 1004 tmpfs_mkdir(void *v) 1005 { 1006 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1007 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1008 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1009 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1010 1011 KASSERT(vap->va_type == VDIR); 1012 1013 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1014 } 1015 1016 /* --------------------------------------------------------------------- */ 1017 1018 int 1019 tmpfs_rmdir(void *v) 1020 { 1021 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1022 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1023 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1024 1025 int error; 1026 struct tmpfs_dirent *de; 1027 struct tmpfs_mount *tmp; 1028 struct tmpfs_node *dnode; 1029 struct tmpfs_node *node; 1030 1031 KASSERT(VOP_ISLOCKED(dvp)); 1032 KASSERT(VOP_ISLOCKED(vp)); 1033 1034 tmp = VFS_TO_TMPFS(dvp->v_mount); 1035 dnode = VP_TO_TMPFS_DIR(dvp); 1036 node = VP_TO_TMPFS_DIR(vp); 1037 error = 0; 1038 1039 /* Directories with more than two entries ('.' and '..') cannot be 1040 * removed. */ 1041 if (node->tn_size > 0) { 1042 error = ENOTEMPTY; 1043 goto out; 1044 } 1045 1046 /* This invariant holds only if we are not trying to remove "..". 1047 * We checked for that above so this is safe now. */ 1048 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1049 1050 /* Get the directory entry associated with node (vp). */ 1051 de = tmpfs_dir_lookup(dnode, cnp); 1052 if (de == NULL) { 1053 error = ENOENT; 1054 goto out; 1055 } 1056 KASSERT(de->td_node == node); 1057 1058 /* Check flags to see if we are allowed to remove the directory. */ 1059 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1060 error = EPERM; 1061 goto out; 1062 } 1063 1064 /* Detach the directory entry from the directory (dnode). */ 1065 tmpfs_dir_detach(dvp, de); 1066 1067 node->tn_links--; 1068 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1069 TMPFS_NODE_MODIFIED; 1070 node->tn_spec.tn_dir.tn_parent->tn_links--; 1071 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1072 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1073 1074 /* Release the parent. */ 1075 cache_purge(dvp); /* XXX Is this needed? */ 1076 1077 /* Free the directory entry we just deleted. Note that the node 1078 * referred by it will not be removed until the vnode is really 1079 * reclaimed. */ 1080 tmpfs_free_dirent(tmp, de, true); 1081 1082 KASSERT(node->tn_links == 0); 1083 out: 1084 /* Release the nodes. */ 1085 vput(dvp); 1086 vput(vp); 1087 1088 return error; 1089 } 1090 1091 /* --------------------------------------------------------------------- */ 1092 1093 int 1094 tmpfs_symlink(void *v) 1095 { 1096 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1097 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1098 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1099 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1100 char *target = ((struct vop_symlink_args *)v)->a_target; 1101 1102 KASSERT(vap->va_type == VLNK); 1103 1104 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1105 } 1106 1107 /* --------------------------------------------------------------------- */ 1108 1109 int 1110 tmpfs_readdir(void *v) 1111 { 1112 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1113 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1114 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1115 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1116 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1117 1118 int error; 1119 off_t startoff; 1120 off_t cnt; 1121 struct tmpfs_node *node; 1122 1123 KASSERT(VOP_ISLOCKED(vp)); 1124 1125 /* This operation only makes sense on directory nodes. */ 1126 if (vp->v_type != VDIR) { 1127 error = ENOTDIR; 1128 goto out; 1129 } 1130 1131 node = VP_TO_TMPFS_DIR(vp); 1132 1133 startoff = uio->uio_offset; 1134 1135 cnt = 0; 1136 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1137 error = tmpfs_dir_getdotdent(node, uio); 1138 if (error == -1) { 1139 error = 0; 1140 goto outok; 1141 } else if (error != 0) 1142 goto outok; 1143 cnt++; 1144 } 1145 1146 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1147 error = tmpfs_dir_getdotdotdent(node, uio); 1148 if (error == -1) { 1149 error = 0; 1150 goto outok; 1151 } else if (error != 0) 1152 goto outok; 1153 cnt++; 1154 } 1155 1156 error = tmpfs_dir_getdents(node, uio, &cnt); 1157 if (error == -1) 1158 error = 0; 1159 KASSERT(error >= 0); 1160 1161 outok: 1162 /* This label assumes that startoff has been 1163 * initialized. If the compiler didn't spit out warnings, we'd 1164 * simply make this one be 'out' and drop 'outok'. */ 1165 1166 if (eofflag != NULL) 1167 *eofflag = 1168 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1169 1170 /* Update NFS-related variables. */ 1171 if (error == 0 && cookies != NULL && ncookies != NULL) { 1172 off_t i; 1173 off_t off = startoff; 1174 struct tmpfs_dirent *de = NULL; 1175 1176 *ncookies = cnt; 1177 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1178 1179 for (i = 0; i < cnt; i++) { 1180 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1181 if (off == TMPFS_DIRCOOKIE_DOT) { 1182 off = TMPFS_DIRCOOKIE_DOTDOT; 1183 } else { 1184 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1185 de = TAILQ_FIRST(&node->tn_spec. 1186 tn_dir.tn_dir); 1187 } else if (de != NULL) { 1188 de = TAILQ_NEXT(de, td_entries); 1189 } else { 1190 de = tmpfs_dir_lookupbycookie(node, 1191 off); 1192 KASSERT(de != NULL); 1193 de = TAILQ_NEXT(de, td_entries); 1194 } 1195 if (de == NULL) { 1196 off = TMPFS_DIRCOOKIE_EOF; 1197 } else { 1198 off = tmpfs_dircookie(de); 1199 } 1200 } 1201 1202 (*cookies)[i] = off; 1203 } 1204 KASSERT(uio->uio_offset == off); 1205 } 1206 1207 out: 1208 KASSERT(VOP_ISLOCKED(vp)); 1209 1210 return error; 1211 } 1212 1213 /* --------------------------------------------------------------------- */ 1214 1215 int 1216 tmpfs_readlink(void *v) 1217 { 1218 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1219 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1220 1221 int error; 1222 struct tmpfs_node *node; 1223 1224 KASSERT(VOP_ISLOCKED(vp)); 1225 KASSERT(uio->uio_offset == 0); 1226 KASSERT(vp->v_type == VLNK); 1227 1228 node = VP_TO_TMPFS_NODE(vp); 1229 1230 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1231 MIN(node->tn_size, uio->uio_resid), uio); 1232 node->tn_status |= TMPFS_NODE_ACCESSED; 1233 1234 KASSERT(VOP_ISLOCKED(vp)); 1235 1236 return error; 1237 } 1238 1239 /* --------------------------------------------------------------------- */ 1240 1241 int 1242 tmpfs_inactive(void *v) 1243 { 1244 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1245 1246 struct tmpfs_node *node; 1247 1248 KASSERT(VOP_ISLOCKED(vp)); 1249 1250 node = VP_TO_TMPFS_NODE(vp); 1251 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1252 VOP_UNLOCK(vp, 0); 1253 1254 return 0; 1255 } 1256 1257 /* --------------------------------------------------------------------- */ 1258 1259 int 1260 tmpfs_reclaim(void *v) 1261 { 1262 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1263 1264 struct tmpfs_mount *tmp; 1265 struct tmpfs_node *node; 1266 1267 node = VP_TO_TMPFS_NODE(vp); 1268 tmp = VFS_TO_TMPFS(vp->v_mount); 1269 1270 cache_purge(vp); 1271 tmpfs_free_vp(vp); 1272 1273 /* If the node referenced by this vnode was deleted by the user, 1274 * we must free its associated data structures (now that the vnode 1275 * is being reclaimed). */ 1276 if (node->tn_links == 0) 1277 tmpfs_free_node(tmp, node); 1278 1279 KASSERT(vp->v_data == NULL); 1280 1281 return 0; 1282 } 1283 1284 /* --------------------------------------------------------------------- */ 1285 1286 int 1287 tmpfs_print(void *v) 1288 { 1289 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1290 1291 struct tmpfs_node *node; 1292 1293 node = VP_TO_TMPFS_NODE(vp); 1294 1295 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1296 node, node->tn_flags, node->tn_links); 1297 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1298 ", status 0x%x\n", 1299 node->tn_mode, node->tn_uid, node->tn_gid, 1300 (uintmax_t)node->tn_size, node->tn_status); 1301 if (vp->v_type == VFIFO) 1302 fifo_printinfo(vp); 1303 printf("\n"); 1304 1305 return 0; 1306 } 1307 1308 /* --------------------------------------------------------------------- */ 1309 1310 int 1311 tmpfs_pathconf(void *v) 1312 { 1313 int name = ((struct vop_pathconf_args *)v)->a_name; 1314 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1315 1316 int error; 1317 1318 error = 0; 1319 1320 switch (name) { 1321 case _PC_LINK_MAX: 1322 *retval = LINK_MAX; 1323 break; 1324 1325 case _PC_NAME_MAX: 1326 *retval = NAME_MAX; 1327 break; 1328 1329 case _PC_PATH_MAX: 1330 *retval = PATH_MAX; 1331 break; 1332 1333 case _PC_PIPE_BUF: 1334 *retval = PIPE_BUF; 1335 break; 1336 1337 case _PC_CHOWN_RESTRICTED: 1338 *retval = 1; 1339 break; 1340 1341 case _PC_NO_TRUNC: 1342 *retval = 1; 1343 break; 1344 1345 case _PC_SYNC_IO: 1346 *retval = 1; 1347 break; 1348 1349 case _PC_FILESIZEBITS: 1350 *retval = 0; /* XXX Don't know which value should I return. */ 1351 break; 1352 1353 default: 1354 error = EINVAL; 1355 } 1356 1357 return error; 1358 } 1359 1360 /* --------------------------------------------------------------------- */ 1361 1362 int 1363 tmpfs_advlock(void *v) 1364 { 1365 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1366 1367 struct tmpfs_node *node; 1368 1369 node = VP_TO_TMPFS_NODE(vp); 1370 1371 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1372 } 1373 1374 /* --------------------------------------------------------------------- */ 1375 1376 int 1377 tmpfs_getpages(void *v) 1378 { 1379 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1380 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1381 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1382 int *count = ((struct vop_getpages_args *)v)->a_count; 1383 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1384 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1385 int advice = ((struct vop_getpages_args *)v)->a_advice; 1386 int flags = ((struct vop_getpages_args *)v)->a_flags; 1387 1388 int error; 1389 int i; 1390 struct tmpfs_node *node; 1391 struct uvm_object *uobj; 1392 int npages = *count; 1393 1394 KASSERT(vp->v_type == VREG); 1395 KASSERT(mutex_owned(&vp->v_interlock)); 1396 1397 node = VP_TO_TMPFS_NODE(vp); 1398 uobj = node->tn_spec.tn_reg.tn_aobj; 1399 1400 /* We currently don't rely on PGO_PASTEOF. */ 1401 1402 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1403 if ((flags & PGO_LOCKED) == 0) 1404 mutex_exit(&vp->v_interlock); 1405 return EINVAL; 1406 } 1407 1408 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1409 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1410 } 1411 1412 if ((flags & PGO_LOCKED) != 0) 1413 return EBUSY; 1414 1415 if ((flags & PGO_NOTIMESTAMP) == 0) { 1416 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1417 node->tn_status |= TMPFS_NODE_ACCESSED; 1418 1419 if ((access_type & VM_PROT_WRITE) != 0) 1420 node->tn_status |= TMPFS_NODE_MODIFIED; 1421 } 1422 1423 mutex_exit(&vp->v_interlock); 1424 1425 /* 1426 * Make sure that the array on which we will store the 1427 * gotten pages is clean. Otherwise uao_get (pointed to by 1428 * the pgo_get below) gets confused and does not return the 1429 * appropriate pages. 1430 * 1431 * XXX This shall be revisited when kern/32166 is addressed 1432 * because the loop to clean m[i] will most likely be redundant 1433 * as well as the PGO_ALLPAGES flag. 1434 */ 1435 if (m != NULL) 1436 for (i = 0; i < npages; i++) 1437 m[i] = NULL; 1438 mutex_enter(&uobj->vmobjlock); 1439 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1440 access_type, advice, flags | PGO_ALLPAGES); 1441 #if defined(DEBUG) 1442 { 1443 /* Make sure that all the pages we return are valid. */ 1444 int dbgi; 1445 if (error == 0 && m != NULL) 1446 for (dbgi = 0; dbgi < npages; dbgi++) 1447 KASSERT(m[dbgi] != NULL); 1448 } 1449 #endif 1450 1451 return error; 1452 } 1453 1454 /* --------------------------------------------------------------------- */ 1455 1456 int 1457 tmpfs_putpages(void *v) 1458 { 1459 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1460 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1461 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1462 int flags = ((struct vop_putpages_args *)v)->a_flags; 1463 1464 int error; 1465 struct tmpfs_node *node; 1466 struct uvm_object *uobj; 1467 1468 KASSERT(mutex_owned(&vp->v_interlock)); 1469 1470 node = VP_TO_TMPFS_NODE(vp); 1471 1472 if (vp->v_type != VREG) { 1473 mutex_exit(&vp->v_interlock); 1474 return 0; 1475 } 1476 1477 uobj = node->tn_spec.tn_reg.tn_aobj; 1478 mutex_exit(&vp->v_interlock); 1479 1480 mutex_enter(&uobj->vmobjlock); 1481 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1482 1483 /* XXX mtime */ 1484 1485 return error; 1486 } 1487
Indexes created Tue Sep 23 02:09:52 GMT 2025