1 /* $NetBSD: tmpfs_vnops.c,v 1.32 2006/11/09 15:36:30 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 1.32 2006/11/09 15:36:30 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_lease_desc, tmpfs_lease }, 113 { &vop_bwrite_desc, tmpfs_bwrite }, 114 { &vop_getpages_desc, tmpfs_getpages }, 115 { &vop_putpages_desc, tmpfs_putpages }, 116 { NULL, NULL } 117 }; 118 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 119 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 120 121 /* --------------------------------------------------------------------- */ 122 123 int 124 tmpfs_lookup(void *v) 125 { 126 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 127 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 128 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 129 130 int error; 131 struct tmpfs_dirent *de; 132 struct tmpfs_node *dnode; 133 134 KASSERT(VOP_ISLOCKED(dvp)); 135 136 dnode = VP_TO_TMPFS_DIR(dvp); 137 *vpp = NULL; 138 139 /* Check accessibility of requested node as a first step. */ 140 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp); 141 if (error != 0) 142 goto out; 143 144 /* If requesting the last path component on a read-only file system 145 * with a write operation, deny it. */ 146 if ((cnp->cn_flags & ISLASTCN) && 147 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 148 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 149 error = EROFS; 150 goto out; 151 } 152 153 /* Avoid doing a linear scan of the directory if the requested 154 * directory/name couple is already in the cache. */ 155 error = cache_lookup(dvp, vpp, cnp); 156 if (error >= 0) 157 goto out; 158 159 /* We cannot be requesting the parent directory of the root node. */ 160 KASSERT(IMPLIES(dnode->tn_type == VDIR && 161 dnode->tn_spec.tn_dir.tn_parent == dnode, 162 !(cnp->cn_flags & ISDOTDOT))); 163 164 if (cnp->cn_flags & ISDOTDOT) { 165 VOP_UNLOCK(dvp, 0); 166 167 /* Allocate a new vnode on the matching entry. */ 168 error = tmpfs_alloc_vp(dvp->v_mount, 169 dnode->tn_spec.tn_dir.tn_parent, vpp); 170 171 if (cnp->cn_flags & LOCKPARENT && 172 cnp->cn_flags & ISLASTCN) { 173 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 174 cnp->cn_flags |= PDIRUNLOCK; 175 } 176 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 177 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 178 VREF(dvp); 179 *vpp = dvp; 180 dnode->tn_lookup_dirent = NULL; 181 error = 0; 182 } else { 183 de = tmpfs_dir_lookup(dnode, cnp); 184 if (de == NULL) { 185 /* The entry was not found in the directory. 186 * This is OK iff we are creating or renaming an 187 * entry and are working on the last component of 188 * the path name. */ 189 if ((cnp->cn_flags & ISLASTCN) && 190 (cnp->cn_nameiop == CREATE || \ 191 cnp->cn_nameiop == RENAME)) { 192 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 193 cnp->cn_lwp); 194 if (error != 0) 195 goto out; 196 197 /* Keep the component name in the buffer for 198 * future uses. */ 199 cnp->cn_flags |= SAVENAME; 200 201 error = EJUSTRETURN; 202 } else 203 error = ENOENT; 204 } else { 205 struct tmpfs_node *tnode; 206 207 /* The entry was found, so get its associated 208 * tmpfs_node. */ 209 tnode = de->td_node; 210 211 /* If we are not at the last path component and 212 * found a non-directory or non-link entry (which 213 * may itself be pointing to a directory), raise 214 * an error. */ 215 if ((tnode->tn_type != VDIR && 216 tnode->tn_type != VLNK) && 217 !(cnp->cn_flags & ISLASTCN)) { 218 error = ENOTDIR; 219 goto out; 220 } 221 222 /* If we are deleting or renaming the entry, keep 223 * track of its tmpfs_dirent so that it can be 224 * easily deleted later. */ 225 if ((cnp->cn_flags & ISLASTCN) && 226 (cnp->cn_nameiop == DELETE || 227 cnp->cn_nameiop == RENAME)) { 228 if ((dnode->tn_mode & S_ISTXT) != 0 && 229 kauth_cred_geteuid(cnp->cn_cred) != 0 && 230 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 231 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 232 return EPERM; 233 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 234 cnp->cn_lwp); 235 if (error != 0) 236 goto out; 237 tnode->tn_lookup_dirent = de; 238 } 239 240 /* Allocate a new vnode on the matching entry. */ 241 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 242 243 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 244 !(cnp->cn_flags & ISLASTCN))) 245 VOP_UNLOCK(dvp, 0); 246 } 247 } 248 249 /* Store the result of this lookup in the cache. Avoid this if the 250 * request was for creation, as it does not improve timings on 251 * emprical tests. */ 252 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 253 cache_enter(dvp, *vpp, cnp); 254 255 out: 256 /* If there were no errors, *vpp cannot be null and it must be 257 * locked. */ 258 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 259 260 /* dvp has to be locked if: 261 * - There were errors and relocking of dvp did not fail. 262 * - We are doing a '..' lookup, relocking of dvp did not fail 263 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 264 * - LOCKPARENT and ISLASTCN are set. */ 265 KASSERT(IMPLIES( 266 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 267 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 268 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 269 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 270 , 271 VOP_ISLOCKED(dvp))); 272 273 return error; 274 } 275 276 /* --------------------------------------------------------------------- */ 277 278 int 279 tmpfs_create(void *v) 280 { 281 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 282 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 283 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 284 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 285 286 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 287 288 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 289 } 290 /* --------------------------------------------------------------------- */ 291 292 int 293 tmpfs_mknod(void *v) 294 { 295 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 296 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 297 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 298 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 299 300 if (vap->va_type != VBLK && vap->va_type != VCHR && 301 vap->va_type != VFIFO) 302 return EINVAL; 303 304 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 305 } 306 307 /* --------------------------------------------------------------------- */ 308 309 int 310 tmpfs_open(void *v) 311 { 312 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 313 int mode = ((struct vop_open_args *)v)->a_mode; 314 315 int error; 316 struct tmpfs_node *node; 317 318 KASSERT(VOP_ISLOCKED(vp)); 319 320 node = VP_TO_TMPFS_NODE(vp); 321 322 /* The file is still active but all its names have been removed 323 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 324 * it is about to die. */ 325 if (node->tn_links < 1) { 326 error = ENOENT; 327 goto out; 328 } 329 330 /* If the file is marked append-only, deny write requests. */ 331 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 332 error = EPERM; 333 else 334 error = 0; 335 336 out: 337 KASSERT(VOP_ISLOCKED(vp)); 338 339 return error; 340 } 341 342 /* --------------------------------------------------------------------- */ 343 344 int 345 tmpfs_close(void *v) 346 { 347 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 348 349 struct tmpfs_node *node; 350 351 KASSERT(VOP_ISLOCKED(vp)); 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 if (node->tn_links > 0) { 356 /* Update node times. No need to do it if the node has 357 * been deleted, because it will vanish after we return. */ 358 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 359 } 360 361 return 0; 362 } 363 364 /* --------------------------------------------------------------------- */ 365 366 int 367 tmpfs_access(void *v) 368 { 369 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 370 int mode = ((struct vop_access_args *)v)->a_mode; 371 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 372 373 int error; 374 struct tmpfs_node *node; 375 376 KASSERT(VOP_ISLOCKED(vp)); 377 378 node = VP_TO_TMPFS_NODE(vp); 379 380 switch (vp->v_type) { 381 case VDIR: 382 /* FALLTHROUGH */ 383 case VLNK: 384 /* FALLTHROUGH */ 385 case VREG: 386 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 387 error = EROFS; 388 goto out; 389 } 390 break; 391 392 case VBLK: 393 /* FALLTHROUGH */ 394 case VCHR: 395 /* FALLTHROUGH */ 396 case VSOCK: 397 /* FALLTHROUGH */ 398 case VFIFO: 399 break; 400 401 default: 402 error = EINVAL; 403 goto out; 404 } 405 406 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 407 error = EPERM; 408 goto out; 409 } 410 411 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 412 node->tn_gid, mode, cred); 413 414 out: 415 KASSERT(VOP_ISLOCKED(vp)); 416 417 return error; 418 } 419 420 /* --------------------------------------------------------------------- */ 421 422 int 423 tmpfs_getattr(void *v) 424 { 425 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 426 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 427 428 struct tmpfs_node *node; 429 430 node = VP_TO_TMPFS_NODE(vp); 431 432 VATTR_NULL(vap); 433 434 tmpfs_itimes(vp, NULL, NULL); 435 436 vap->va_type = vp->v_type; 437 vap->va_mode = node->tn_mode; 438 vap->va_nlink = node->tn_links; 439 vap->va_uid = node->tn_uid; 440 vap->va_gid = node->tn_gid; 441 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 442 vap->va_fileid = node->tn_id; 443 vap->va_size = node->tn_size; 444 vap->va_blocksize = PAGE_SIZE; 445 vap->va_atime = node->tn_atime; 446 vap->va_mtime = node->tn_mtime; 447 vap->va_ctime = node->tn_ctime; 448 vap->va_birthtime = node->tn_birthtime; 449 vap->va_gen = node->tn_gen; 450 vap->va_flags = node->tn_flags; 451 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 452 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 453 vap->va_bytes = round_page(node->tn_size); 454 vap->va_filerev = VNOVAL; 455 vap->va_vaflags = 0; 456 vap->va_spare = VNOVAL; /* XXX */ 457 458 return 0; 459 } 460 461 /* --------------------------------------------------------------------- */ 462 463 /* XXX Should this operation be atomic? I think it should, but code in 464 * XXX other places (e.g., ufs) doesn't seem to be... */ 465 int 466 tmpfs_setattr(void *v) 467 { 468 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 469 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 470 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 471 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 472 473 int error; 474 475 KASSERT(VOP_ISLOCKED(vp)); 476 477 error = 0; 478 479 /* Abort if any unsettable attribute is given. */ 480 if (vap->va_type != VNON || 481 vap->va_nlink != VNOVAL || 482 vap->va_fsid != VNOVAL || 483 vap->va_fileid != VNOVAL || 484 vap->va_blocksize != VNOVAL || 485 vap->va_ctime.tv_sec != VNOVAL || 486 vap->va_ctime.tv_nsec != VNOVAL || 487 vap->va_birthtime.tv_sec != VNOVAL || 488 vap->va_birthtime.tv_nsec != VNOVAL || 489 vap->va_gen != VNOVAL || 490 vap->va_rdev != VNOVAL || 491 vap->va_bytes != VNOVAL) 492 error = EINVAL; 493 494 if (error == 0 && (vap->va_flags != VNOVAL)) 495 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 496 497 if (error == 0 && (vap->va_size != VNOVAL)) 498 error = tmpfs_chsize(vp, vap->va_size, cred, l); 499 500 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 501 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 502 503 if (error == 0 && (vap->va_mode != VNOVAL)) 504 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 505 506 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 507 vap->va_atime.tv_nsec != VNOVAL) || 508 (vap->va_mtime.tv_sec != VNOVAL && 509 vap->va_mtime.tv_nsec != VNOVAL))) 510 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 511 vap->va_vaflags, cred, l); 512 513 /* Update the node times. We give preference to the error codes 514 * generated by this function rather than the ones that may arise 515 * from tmpfs_update. */ 516 tmpfs_update(vp, NULL, NULL, 0); 517 518 KASSERT(VOP_ISLOCKED(vp)); 519 520 return error; 521 } 522 523 /* --------------------------------------------------------------------- */ 524 525 int 526 tmpfs_read(void *v) 527 { 528 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 529 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 530 531 int error; 532 int flags; 533 struct tmpfs_node *node; 534 struct uvm_object *uobj; 535 536 KASSERT(VOP_ISLOCKED(vp)); 537 538 node = VP_TO_TMPFS_NODE(vp); 539 540 if (vp->v_type != VREG) { 541 error = EISDIR; 542 goto out; 543 } 544 545 if (uio->uio_offset < 0) { 546 error = EINVAL; 547 goto out; 548 } 549 550 node->tn_status |= TMPFS_NODE_ACCESSED; 551 552 uobj = node->tn_spec.tn_reg.tn_aobj; 553 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 554 error = 0; 555 while (error == 0 && uio->uio_resid > 0) { 556 vsize_t len; 557 void *win; 558 559 if (node->tn_size <= uio->uio_offset) 560 break; 561 562 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 563 if (len == 0) 564 break; 565 566 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 567 UBC_READ); 568 error = uiomove(win, len, uio); 569 ubc_release(win, flags); 570 } 571 572 out: 573 KASSERT(VOP_ISLOCKED(vp)); 574 575 return error; 576 } 577 578 /* --------------------------------------------------------------------- */ 579 580 int 581 tmpfs_write(void *v) 582 { 583 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 584 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 585 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 586 587 boolean_t extended; 588 int error; 589 int flags; 590 off_t oldsize; 591 struct tmpfs_node *node; 592 struct uvm_object *uobj; 593 594 KASSERT(VOP_ISLOCKED(vp)); 595 596 node = VP_TO_TMPFS_NODE(vp); 597 oldsize = node->tn_size; 598 599 if (uio->uio_offset < 0 || vp->v_type != VREG) { 600 error = EINVAL; 601 goto out; 602 } 603 604 if (uio->uio_resid == 0) { 605 error = 0; 606 goto out; 607 } 608 609 if (ioflag & IO_APPEND) 610 uio->uio_offset = node->tn_size; 611 612 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 613 if (extended) { 614 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 615 if (error != 0) 616 goto out; 617 } 618 619 uobj = node->tn_spec.tn_reg.tn_aobj; 620 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 621 error = 0; 622 while (error == 0 && uio->uio_resid > 0) { 623 vsize_t len; 624 void *win; 625 626 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 627 if (len == 0) 628 break; 629 630 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 631 UBC_WRITE); 632 error = uiomove(win, len, uio); 633 ubc_release(win, flags); 634 } 635 636 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 637 (extended ? TMPFS_NODE_CHANGED : 0); 638 639 if (error != 0) 640 (void)tmpfs_reg_resize(vp, oldsize); 641 642 VN_KNOTE(vp, NOTE_WRITE); 643 644 out: 645 KASSERT(VOP_ISLOCKED(vp)); 646 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 647 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 648 649 return error; 650 } 651 652 /* --------------------------------------------------------------------- */ 653 654 int 655 tmpfs_fsync(void *v) 656 { 657 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 658 659 KASSERT(VOP_ISLOCKED(vp)); 660 661 tmpfs_update(vp, NULL, NULL, 0); 662 663 return 0; 664 } 665 666 /* --------------------------------------------------------------------- */ 667 668 int 669 tmpfs_remove(void *v) 670 { 671 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 672 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 673 674 int error; 675 struct tmpfs_dirent *de; 676 struct tmpfs_mount *tmp; 677 struct tmpfs_node *dnode; 678 struct tmpfs_node *node; 679 680 KASSERT(VOP_ISLOCKED(dvp)); 681 KASSERT(VOP_ISLOCKED(vp)); 682 683 dnode = VP_TO_TMPFS_DIR(dvp); 684 node = VP_TO_TMPFS_NODE(vp); 685 tmp = VFS_TO_TMPFS(vp->v_mount); 686 de = node->tn_lookup_dirent; 687 KASSERT(de != NULL); 688 689 /* XXX: Why isn't this done by the caller? */ 690 if (vp->v_type == VDIR) { 691 error = EISDIR; 692 goto out; 693 } 694 695 /* Files marked as immutable or append-only cannot be deleted. */ 696 if (node->tn_flags & (IMMUTABLE | APPEND)) { 697 error = EPERM; 698 goto out; 699 } 700 701 /* Remove the entry from the directory; as it is a file, we do not 702 * have to change the number of hard links of the directory. */ 703 tmpfs_dir_detach(dvp, de); 704 705 /* Free the directory entry we just deleted. Note that the node 706 * referred by it will not be removed until the vnode is really 707 * reclaimed. */ 708 tmpfs_free_dirent(tmp, de, TRUE); 709 710 error = 0; 711 712 out: 713 vput(dvp); 714 vput(vp); 715 716 KASSERT(!VOP_ISLOCKED(dvp)); 717 718 return error; 719 } 720 721 /* --------------------------------------------------------------------- */ 722 723 int 724 tmpfs_link(void *v) 725 { 726 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 727 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 728 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 729 730 int error; 731 struct tmpfs_dirent *de; 732 struct tmpfs_node *dnode; 733 struct tmpfs_node *node; 734 735 KASSERT(VOP_ISLOCKED(dvp)); 736 KASSERT(!VOP_ISLOCKED(vp)); 737 KASSERT(cnp->cn_flags & HASBUF); 738 KASSERT(dvp != vp); /* XXX When can this be false? */ 739 740 dnode = VP_TO_TMPFS_DIR(dvp); 741 node = VP_TO_TMPFS_NODE(vp); 742 743 /* Lock vp because we will need to run tmpfs_update over it, which 744 * needs the vnode to be locked. */ 745 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 746 if (error != 0) 747 goto out; 748 749 /* XXX: Why aren't the following two tests done by the caller? */ 750 751 /* Hard links of directories are forbidden. */ 752 if (vp->v_type == VDIR) { 753 error = EPERM; 754 goto out; 755 } 756 757 /* Cannot create cross-device links. */ 758 if (dvp->v_mount != vp->v_mount) { 759 error = EXDEV; 760 goto out; 761 } 762 763 /* Ensure that we do not overflow the maximum number of links imposed 764 * by the system. */ 765 KASSERT(node->tn_links <= LINK_MAX); 766 if (node->tn_links == LINK_MAX) { 767 error = EMLINK; 768 goto out; 769 } 770 771 /* We cannot create links of files marked immutable or append-only. */ 772 if (node->tn_flags & (IMMUTABLE | APPEND)) { 773 error = EPERM; 774 goto out; 775 } 776 777 /* Allocate a new directory entry to represent the node. */ 778 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 779 cnp->cn_nameptr, cnp->cn_namelen, &de); 780 if (error != 0) 781 goto out; 782 783 /* Insert the new directory entry into the appropriate directory. */ 784 tmpfs_dir_attach(dvp, de); 785 786 /* vp link count has changed, so update node times. */ 787 node->tn_status |= TMPFS_NODE_CHANGED; 788 tmpfs_update(vp, NULL, NULL, 0); 789 790 error = 0; 791 792 out: 793 if (VOP_ISLOCKED(vp)) 794 VOP_UNLOCK(vp, 0); 795 796 PNBUF_PUT(cnp->cn_pnbuf); 797 798 vput(dvp); 799 800 /* XXX Locking status of dvp does not match manual page. */ 801 KASSERT(!VOP_ISLOCKED(dvp)); 802 KASSERT(!VOP_ISLOCKED(vp)); 803 804 return error; 805 } 806 807 /* --------------------------------------------------------------------- */ 808 809 int 810 tmpfs_rename(void *v) 811 { 812 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 813 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 814 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 815 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 816 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 817 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 818 819 char *newname; 820 int error; 821 struct tmpfs_dirent *de; 822 struct tmpfs_mount *tmp; 823 struct tmpfs_node *fdnode; 824 struct tmpfs_node *fnode; 825 struct tmpfs_node *tdnode; 826 827 KASSERT(VOP_ISLOCKED(tdvp)); 828 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 829 KASSERT(fcnp->cn_flags & HASBUF); 830 KASSERT(tcnp->cn_flags & HASBUF); 831 832 fdnode = VP_TO_TMPFS_DIR(fdvp); 833 fnode = VP_TO_TMPFS_NODE(fvp); 834 de = fnode->tn_lookup_dirent; 835 836 /* Disallow cross-device renames. 837 * XXX Why isn't this done by the caller? */ 838 if (fvp->v_mount != tdvp->v_mount || 839 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 840 error = EXDEV; 841 goto out; 842 } 843 844 tmp = VFS_TO_TMPFS(tdvp->v_mount); 845 tdnode = VP_TO_TMPFS_DIR(tdvp); 846 847 /* If source and target are the same file, there is nothing to do. */ 848 if (fvp == tvp) { 849 error = 0; 850 goto out; 851 } 852 853 /* Avoid manipulating '.' and '..' entries. */ 854 if (de == NULL) { 855 KASSERT(fvp->v_type == VDIR); 856 error = EINVAL; 857 goto out; 858 } 859 KASSERT(de->td_node == fnode); 860 861 /* If we need to move the directory between entries, lock the 862 * source so that we can safely operate on it. */ 863 if (fdnode != tdnode) { 864 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 865 if (error != 0) 866 goto out; 867 } 868 869 /* Ensure that we have enough memory to hold the new name, if it 870 * has to be changed. */ 871 if (fcnp->cn_namelen != tcnp->cn_namelen || 872 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 873 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 874 tcnp->cn_namelen, 0); 875 if (newname == NULL) { 876 error = ENOSPC; 877 goto out_locked; 878 } 879 } else 880 newname = NULL; 881 882 /* If the node is being moved to another directory, we have to do 883 * the move. */ 884 if (fdnode != tdnode) { 885 /* In case we are moving a directory, we have to adjust its 886 * parent to point to the new parent. */ 887 if (de->td_node->tn_type == VDIR) { 888 struct tmpfs_node *n; 889 890 /* Ensure the target directory is not a child of the 891 * directory being moved. Otherwise, we'd end up 892 * with stale nodes. */ 893 n = tdnode; 894 while (n != n->tn_spec.tn_dir.tn_parent) { 895 if (n == fnode) { 896 error = EINVAL; 897 goto out_locked; 898 } 899 n = n->tn_spec.tn_dir.tn_parent; 900 } 901 902 /* Adjust the parent pointer. */ 903 TMPFS_VALIDATE_DIR(fnode); 904 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 905 906 /* As a result of changing the target of the '..' 907 * entry, the link count of the source and target 908 * directories has to be adjusted. */ 909 fdnode->tn_links--; 910 tdnode->tn_links++; 911 } 912 913 /* Do the move: just remove the entry from the source directory 914 * and insert it into the target one. */ 915 tmpfs_dir_detach(fdvp, de); 916 tmpfs_dir_attach(tdvp, de); 917 918 /* Notify listeners of fdvp about the change in the directory. 919 * We can do it at this point because we aren't touching fdvp 920 * any more below. */ 921 VN_KNOTE(fdvp, NOTE_WRITE); 922 } 923 924 /* If the name has changed, we need to make it effective by changing 925 * it in the directory entry. */ 926 if (newname != NULL) { 927 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 928 KASSERT(tcnp->cn_namelen < 0xffff); 929 930 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 931 de->td_namelen); 932 de->td_namelen = (uint16_t)tcnp->cn_namelen; 933 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 934 de->td_name = newname; 935 936 fnode->tn_status |= TMPFS_NODE_CHANGED; 937 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 938 } 939 940 /* If we are overwriting an entry, we have to remove the old one 941 * from the target directory. */ 942 if (tvp != NULL) { 943 struct tmpfs_node *tnode; 944 945 tnode = VP_TO_TMPFS_NODE(tvp); 946 947 /* The source node cannot be a directory in this case. */ 948 KASSERT(fnode->tn_type != VDIR); 949 950 /* Remove the old entry from the target directory. */ 951 de = tnode->tn_lookup_dirent; 952 tmpfs_dir_detach(tdvp, de); 953 954 /* Free the directory entry we just deleted. Note that the 955 * node referred by it will not be removed until the vnode is 956 * really reclaimed. */ 957 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 958 } 959 960 /* Notify listeners of tdvp about the change in the directory (either 961 * because a new entry was added or because one was removed) and 962 * listeners of fvp about the rename. */ 963 VN_KNOTE(tdvp, NOTE_WRITE); 964 VN_KNOTE(fvp, NOTE_RENAME); 965 966 error = 0; 967 968 out_locked: 969 if (fdnode != tdnode) 970 VOP_UNLOCK(fdvp, 0); 971 972 out: 973 /* Release target nodes. */ 974 /* XXX: I don't understand when tdvp can be the same as tvp, but 975 * other code takes care of this... */ 976 if (tdvp == tvp) 977 vrele(tdvp); 978 else 979 vput(tdvp); 980 if (tvp != NULL) 981 vput(tvp); 982 983 /* Release source nodes. */ 984 vrele(fdvp); 985 vrele(fvp); 986 987 return error; 988 } 989 990 /* --------------------------------------------------------------------- */ 991 992 int 993 tmpfs_mkdir(void *v) 994 { 995 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 996 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 997 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 998 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 999 1000 KASSERT(vap->va_type == VDIR); 1001 1002 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1003 } 1004 1005 /* --------------------------------------------------------------------- */ 1006 1007 int 1008 tmpfs_rmdir(void *v) 1009 { 1010 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1011 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1012 1013 int error; 1014 struct tmpfs_dirent *de; 1015 struct tmpfs_mount *tmp; 1016 struct tmpfs_node *dnode; 1017 struct tmpfs_node *node; 1018 1019 KASSERT(VOP_ISLOCKED(dvp)); 1020 KASSERT(VOP_ISLOCKED(vp)); 1021 1022 tmp = VFS_TO_TMPFS(dvp->v_mount); 1023 dnode = VP_TO_TMPFS_DIR(dvp); 1024 node = VP_TO_TMPFS_DIR(vp); 1025 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1026 1027 /* Get the directory entry associated with node (vp). This was 1028 * filled by tmpfs_lookup while looking up the entry. */ 1029 de = node->tn_lookup_dirent; 1030 KASSERT(TMPFS_DIRENT_MATCHES(de, 1031 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1032 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1033 1034 /* Directories with more than two entries ('.' and '..') cannot be 1035 * removed. */ 1036 if (node->tn_size > 0) { 1037 error = ENOTEMPTY; 1038 goto out; 1039 } 1040 1041 /* Check flags to see if we are allowed to remove the directory. */ 1042 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1043 error = EPERM; 1044 goto out; 1045 } 1046 1047 /* Detach the directory entry from the directory (dnode). */ 1048 tmpfs_dir_detach(dvp, de); 1049 1050 node->tn_links--; 1051 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1052 TMPFS_NODE_MODIFIED; 1053 node->tn_spec.tn_dir.tn_parent->tn_links--; 1054 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1055 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1056 1057 /* Release the parent. */ 1058 cache_purge(dvp); /* XXX Is this needed? */ 1059 vput(dvp); 1060 1061 /* Free the directory entry we just deleted. Note that the node 1062 * referred by it will not be removed until the vnode is really 1063 * reclaimed. */ 1064 tmpfs_free_dirent(tmp, de, TRUE); 1065 1066 /* Release the deleted vnode (will destroy the node, notify 1067 * interested parties and clean it from the cache). */ 1068 vput(vp); 1069 1070 error = 0; 1071 1072 out: 1073 if (error != 0) { 1074 vput(dvp); 1075 vput(vp); 1076 } 1077 1078 return error; 1079 } 1080 1081 /* --------------------------------------------------------------------- */ 1082 1083 int 1084 tmpfs_symlink(void *v) 1085 { 1086 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1087 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1088 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1089 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1090 char *target = ((struct vop_symlink_args *)v)->a_target; 1091 1092 KASSERT(vap->va_type == VLNK); 1093 1094 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1095 } 1096 1097 /* --------------------------------------------------------------------- */ 1098 1099 int 1100 tmpfs_readdir(void *v) 1101 { 1102 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1103 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1104 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1105 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1106 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1107 1108 int error; 1109 off_t startoff; 1110 off_t cnt; 1111 struct tmpfs_node *node; 1112 1113 KASSERT(VOP_ISLOCKED(vp)); 1114 1115 /* This operation only makes sense on directory nodes. */ 1116 if (vp->v_type != VDIR) { 1117 error = ENOTDIR; 1118 goto out; 1119 } 1120 1121 node = VP_TO_TMPFS_DIR(vp); 1122 1123 startoff = uio->uio_offset; 1124 1125 cnt = 0; 1126 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1127 error = tmpfs_dir_getdotdent(node, uio); 1128 if (error == -1) { 1129 error = 0; 1130 goto outok; 1131 } else if (error != 0) 1132 goto outok; 1133 cnt++; 1134 } 1135 1136 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1137 error = tmpfs_dir_getdotdotdent(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 error = tmpfs_dir_getdents(node, uio, &cnt); 1147 if (error == -1) 1148 error = 0; 1149 KASSERT(error >= 0); 1150 1151 outok: 1152 /* This label assumes that startoff has been 1153 * initialized. If the compiler didn't spit out warnings, we'd 1154 * simply make this one be 'out' and drop 'outok'. */ 1155 1156 if (eofflag != NULL) 1157 *eofflag = 1158 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1159 1160 /* Update NFS-related variables. */ 1161 if (error == 0 && cookies != NULL && ncookies != NULL) { 1162 off_t i; 1163 off_t off = startoff; 1164 struct tmpfs_dirent *de = NULL; 1165 1166 *ncookies = cnt; 1167 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1168 1169 for (i = 0; i < cnt; i++) { 1170 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1171 if (off == TMPFS_DIRCOOKIE_DOT) { 1172 off = TMPFS_DIRCOOKIE_DOTDOT; 1173 } else { 1174 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1175 de = TAILQ_FIRST(&node->tn_spec. 1176 tn_dir.tn_dir); 1177 } else if (de != NULL) { 1178 de = TAILQ_NEXT(de, td_entries); 1179 } else { 1180 de = tmpfs_dir_lookupbycookie(node, 1181 off); 1182 KASSERT(de != NULL); 1183 de = TAILQ_NEXT(de, td_entries); 1184 } 1185 if (de == NULL) { 1186 off = TMPFS_DIRCOOKIE_EOF; 1187 } else { 1188 off = tmpfs_dircookie(de); 1189 } 1190 } 1191 1192 (*cookies)[i] = off; 1193 } 1194 KASSERT(uio->uio_offset == off); 1195 } 1196 1197 out: 1198 KASSERT(VOP_ISLOCKED(vp)); 1199 1200 return error; 1201 } 1202 1203 /* --------------------------------------------------------------------- */ 1204 1205 int 1206 tmpfs_readlink(void *v) 1207 { 1208 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1209 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1210 1211 int error; 1212 struct tmpfs_node *node; 1213 1214 KASSERT(VOP_ISLOCKED(vp)); 1215 KASSERT(uio->uio_offset == 0); 1216 KASSERT(vp->v_type == VLNK); 1217 1218 node = VP_TO_TMPFS_NODE(vp); 1219 1220 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1221 MIN(node->tn_size, uio->uio_resid), uio); 1222 node->tn_status |= TMPFS_NODE_ACCESSED; 1223 1224 KASSERT(VOP_ISLOCKED(vp)); 1225 1226 return error; 1227 } 1228 1229 /* --------------------------------------------------------------------- */ 1230 1231 int 1232 tmpfs_inactive(void *v) 1233 { 1234 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1235 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1236 1237 struct tmpfs_node *node; 1238 1239 KASSERT(VOP_ISLOCKED(vp)); 1240 1241 node = VP_TO_TMPFS_NODE(vp); 1242 1243 VOP_UNLOCK(vp, 0); 1244 1245 if (node->tn_links == 0) 1246 vrecycle(vp, NULL, l); 1247 1248 return 0; 1249 } 1250 1251 /* --------------------------------------------------------------------- */ 1252 1253 int 1254 tmpfs_reclaim(void *v) 1255 { 1256 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1257 1258 struct tmpfs_mount *tmp; 1259 struct tmpfs_node *node; 1260 1261 KASSERT(!VOP_ISLOCKED(vp)); 1262 1263 node = VP_TO_TMPFS_NODE(vp); 1264 tmp = VFS_TO_TMPFS(vp->v_mount); 1265 1266 cache_purge(vp); 1267 tmpfs_free_vp(vp); 1268 1269 /* If the node referenced by this vnode was deleted by the user, 1270 * we must free its associated data structures (now that the vnode 1271 * is being reclaimed). */ 1272 if (node->tn_links == 0) 1273 tmpfs_free_node(tmp, node); 1274 1275 KASSERT(!VOP_ISLOCKED(vp)); 1276 KASSERT(vp->v_data == NULL); 1277 1278 return 0; 1279 } 1280 1281 /* --------------------------------------------------------------------- */ 1282 1283 int 1284 tmpfs_print(void *v) 1285 { 1286 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1287 1288 struct tmpfs_node *node; 1289 1290 node = VP_TO_TMPFS_NODE(vp); 1291 1292 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1293 node, node->tn_flags, node->tn_links); 1294 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1295 ", status 0x%x\n", 1296 node->tn_mode, node->tn_uid, node->tn_gid, 1297 (uintmax_t)node->tn_size, node->tn_status); 1298 1299 if (vp->v_type == VFIFO) 1300 fifo_printinfo(vp); 1301 lockmgr_printinfo(&vp->v_lock); 1302 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 LOCK_ASSERT(simple_lock_held(&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 simple_unlock(&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 simple_unlock(&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 simple_lock(&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 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1469 1470 node = VP_TO_TMPFS_NODE(vp); 1471 1472 if (vp->v_type != VREG) { 1473 simple_unlock(&vp->v_interlock); 1474 return 0; 1475 } 1476 1477 uobj = node->tn_spec.tn_reg.tn_aobj; 1478 simple_unlock(&vp->v_interlock); 1479 1480 simple_lock(&uobj->vmobjlock); 1481 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1482 1483 /* XXX mtime */ 1484 1485 return error; 1486 } 1487