1 /* $NetBSD: tmpfs_vnops.c,v 1.52 2008/11/26 20:17:33 pooka 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.52 2008/11/26 20:17:33 pooka Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/lockf.h> 52 #include <sys/kauth.h> 53 54 #include <uvm/uvm.h> 55 56 #include <miscfs/fifofs/fifo.h> 57 #include <fs/tmpfs/tmpfs_vnops.h> 58 #include <fs/tmpfs/tmpfs.h> 59 60 /* --------------------------------------------------------------------- */ 61 62 /* 63 * vnode operations vector used for files stored in a tmpfs file system. 64 */ 65 int (**tmpfs_vnodeop_p)(void *); 66 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 67 { &vop_default_desc, vn_default_error }, 68 { &vop_lookup_desc, tmpfs_lookup }, 69 { &vop_create_desc, tmpfs_create }, 70 { &vop_mknod_desc, tmpfs_mknod }, 71 { &vop_open_desc, tmpfs_open }, 72 { &vop_close_desc, tmpfs_close }, 73 { &vop_access_desc, tmpfs_access }, 74 { &vop_getattr_desc, tmpfs_getattr }, 75 { &vop_setattr_desc, tmpfs_setattr }, 76 { &vop_read_desc, tmpfs_read }, 77 { &vop_write_desc, tmpfs_write }, 78 { &vop_ioctl_desc, tmpfs_ioctl }, 79 { &vop_fcntl_desc, tmpfs_fcntl }, 80 { &vop_poll_desc, tmpfs_poll }, 81 { &vop_kqfilter_desc, tmpfs_kqfilter }, 82 { &vop_revoke_desc, tmpfs_revoke }, 83 { &vop_mmap_desc, tmpfs_mmap }, 84 { &vop_fsync_desc, tmpfs_fsync }, 85 { &vop_seek_desc, tmpfs_seek }, 86 { &vop_remove_desc, tmpfs_remove }, 87 { &vop_link_desc, tmpfs_link }, 88 { &vop_rename_desc, tmpfs_rename }, 89 { &vop_mkdir_desc, tmpfs_mkdir }, 90 { &vop_rmdir_desc, tmpfs_rmdir }, 91 { &vop_symlink_desc, tmpfs_symlink }, 92 { &vop_readdir_desc, tmpfs_readdir }, 93 { &vop_readlink_desc, tmpfs_readlink }, 94 { &vop_abortop_desc, tmpfs_abortop }, 95 { &vop_inactive_desc, tmpfs_inactive }, 96 { &vop_reclaim_desc, tmpfs_reclaim }, 97 { &vop_lock_desc, tmpfs_lock }, 98 { &vop_unlock_desc, tmpfs_unlock }, 99 { &vop_bmap_desc, tmpfs_bmap }, 100 { &vop_strategy_desc, tmpfs_strategy }, 101 { &vop_print_desc, tmpfs_print }, 102 { &vop_pathconf_desc, tmpfs_pathconf }, 103 { &vop_islocked_desc, tmpfs_islocked }, 104 { &vop_advlock_desc, tmpfs_advlock }, 105 { &vop_bwrite_desc, tmpfs_bwrite }, 106 { &vop_getpages_desc, tmpfs_getpages }, 107 { &vop_putpages_desc, tmpfs_putpages }, 108 { NULL, NULL } 109 }; 110 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 111 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 112 113 /* --------------------------------------------------------------------- */ 114 115 int 116 tmpfs_lookup(void *v) 117 { 118 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 119 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 120 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 121 122 int error; 123 struct tmpfs_dirent *de; 124 struct tmpfs_node *dnode; 125 126 KASSERT(VOP_ISLOCKED(dvp)); 127 128 dnode = VP_TO_TMPFS_DIR(dvp); 129 *vpp = NULL; 130 131 /* Check accessibility of requested node as a first step. */ 132 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 133 if (error != 0) 134 goto out; 135 136 /* If requesting the last path component on a read-only file system 137 * with a write operation, deny it. */ 138 if ((cnp->cn_flags & ISLASTCN) && 139 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 140 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 141 error = EROFS; 142 goto out; 143 } 144 145 /* Avoid doing a linear scan of the directory if the requested 146 * directory/name couple is already in the cache. */ 147 error = cache_lookup(dvp, vpp, cnp); 148 if (error >= 0) 149 goto out; 150 151 /* We cannot be requesting the parent directory of the root node. */ 152 KASSERT(IMPLIES(dnode->tn_type == VDIR && 153 dnode->tn_spec.tn_dir.tn_parent == dnode, 154 !(cnp->cn_flags & ISDOTDOT))); 155 156 if (cnp->cn_flags & ISDOTDOT) { 157 VOP_UNLOCK(dvp, 0); 158 159 /* Allocate a new vnode on the matching entry. */ 160 error = tmpfs_alloc_vp(dvp->v_mount, 161 dnode->tn_spec.tn_dir.tn_parent, vpp); 162 163 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 164 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 165 VREF(dvp); 166 *vpp = dvp; 167 error = 0; 168 } else { 169 de = tmpfs_dir_lookup(dnode, cnp); 170 if (de == NULL) { 171 /* The entry was not found in the directory. 172 * This is OK iff we are creating or renaming an 173 * entry and are working on the last component of 174 * the path name. */ 175 if ((cnp->cn_flags & ISLASTCN) && 176 (cnp->cn_nameiop == CREATE || \ 177 cnp->cn_nameiop == RENAME)) { 178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 179 if (error != 0) 180 goto out; 181 182 /* Keep the component name in the buffer for 183 * future uses. */ 184 cnp->cn_flags |= SAVENAME; 185 186 error = EJUSTRETURN; 187 } else 188 error = ENOENT; 189 } else { 190 struct tmpfs_node *tnode; 191 192 /* The entry was found, so get its associated 193 * tmpfs_node. */ 194 tnode = de->td_node; 195 196 /* If we are not at the last path component and 197 * found a non-directory or non-link entry (which 198 * may itself be pointing to a directory), raise 199 * an error. */ 200 if ((tnode->tn_type != VDIR && 201 tnode->tn_type != VLNK) && 202 !(cnp->cn_flags & ISLASTCN)) { 203 error = ENOTDIR; 204 goto out; 205 } 206 207 /* If we are deleting or renaming the entry, keep 208 * track of its tmpfs_dirent so that it can be 209 * easily deleted later. */ 210 if ((cnp->cn_flags & ISLASTCN) && 211 (cnp->cn_nameiop == DELETE || 212 cnp->cn_nameiop == RENAME)) { 213 if ((dnode->tn_mode & S_ISTXT) != 0 && 214 kauth_authorize_generic(cnp->cn_cred, 215 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 return EPERM; 219 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 220 if (error != 0) 221 goto out; 222 } else 223 de = NULL; 224 225 /* Allocate a new vnode on the matching entry. */ 226 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 227 } 228 } 229 230 /* Store the result of this lookup in the cache. Avoid this if the 231 * request was for creation, as it does not improve timings on 232 * emprical tests. */ 233 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 234 (cnp->cn_flags & ISDOTDOT) == 0) 235 cache_enter(dvp, *vpp, cnp); 236 237 out: 238 /* If there were no errors, *vpp cannot be null and it must be 239 * locked. */ 240 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 241 242 /* dvp must always be locked. */ 243 KASSERT(VOP_ISLOCKED(dvp)); 244 245 return error; 246 } 247 248 /* --------------------------------------------------------------------- */ 249 250 int 251 tmpfs_create(void *v) 252 { 253 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 254 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 255 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 256 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 257 258 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 259 260 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 261 } 262 /* --------------------------------------------------------------------- */ 263 264 int 265 tmpfs_mknod(void *v) 266 { 267 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 268 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 269 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 270 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 271 272 if (vap->va_type != VBLK && vap->va_type != VCHR && 273 vap->va_type != VFIFO) 274 return EINVAL; 275 276 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 277 } 278 279 /* --------------------------------------------------------------------- */ 280 281 int 282 tmpfs_open(void *v) 283 { 284 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 285 int mode = ((struct vop_open_args *)v)->a_mode; 286 287 int error; 288 struct tmpfs_node *node; 289 290 KASSERT(VOP_ISLOCKED(vp)); 291 292 node = VP_TO_TMPFS_NODE(vp); 293 294 /* The file is still active but all its names have been removed 295 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 296 * it is about to die. */ 297 if (node->tn_links < 1) { 298 error = ENOENT; 299 goto out; 300 } 301 302 /* If the file is marked append-only, deny write requests. */ 303 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 304 error = EPERM; 305 else 306 error = 0; 307 308 out: 309 KASSERT(VOP_ISLOCKED(vp)); 310 311 return error; 312 } 313 314 /* --------------------------------------------------------------------- */ 315 316 int 317 tmpfs_close(void *v) 318 { 319 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 320 321 struct tmpfs_node *node; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 node = VP_TO_TMPFS_NODE(vp); 326 327 if (node->tn_links > 0) { 328 /* Update node times. No need to do it if the node has 329 * been deleted, because it will vanish after we return. */ 330 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 331 } 332 333 return 0; 334 } 335 336 /* --------------------------------------------------------------------- */ 337 338 int 339 tmpfs_access(void *v) 340 { 341 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 342 int mode = ((struct vop_access_args *)v)->a_mode; 343 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 344 345 int error; 346 struct tmpfs_node *node; 347 348 KASSERT(VOP_ISLOCKED(vp)); 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 switch (vp->v_type) { 353 case VDIR: 354 /* FALLTHROUGH */ 355 case VLNK: 356 /* FALLTHROUGH */ 357 case VREG: 358 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 359 error = EROFS; 360 goto out; 361 } 362 break; 363 364 case VBLK: 365 /* FALLTHROUGH */ 366 case VCHR: 367 /* FALLTHROUGH */ 368 case VSOCK: 369 /* FALLTHROUGH */ 370 case VFIFO: 371 break; 372 373 default: 374 error = EINVAL; 375 goto out; 376 } 377 378 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 379 error = EPERM; 380 goto out; 381 } 382 383 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 384 node->tn_gid, mode, cred); 385 386 out: 387 KASSERT(VOP_ISLOCKED(vp)); 388 389 return error; 390 } 391 392 /* --------------------------------------------------------------------- */ 393 394 int 395 tmpfs_getattr(void *v) 396 { 397 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 398 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 399 400 struct tmpfs_node *node; 401 402 node = VP_TO_TMPFS_NODE(vp); 403 404 VATTR_NULL(vap); 405 406 tmpfs_itimes(vp, NULL, NULL, NULL); 407 408 vap->va_type = vp->v_type; 409 vap->va_mode = node->tn_mode; 410 vap->va_nlink = node->tn_links; 411 vap->va_uid = node->tn_uid; 412 vap->va_gid = node->tn_gid; 413 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 414 vap->va_fileid = node->tn_id; 415 vap->va_size = node->tn_size; 416 vap->va_blocksize = PAGE_SIZE; 417 vap->va_atime = node->tn_atime; 418 vap->va_mtime = node->tn_mtime; 419 vap->va_ctime = node->tn_ctime; 420 vap->va_birthtime = node->tn_birthtime; 421 vap->va_gen = node->tn_gen; 422 vap->va_flags = node->tn_flags; 423 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 424 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 425 vap->va_bytes = round_page(node->tn_size); 426 vap->va_filerev = VNOVAL; 427 vap->va_vaflags = 0; 428 vap->va_spare = VNOVAL; /* XXX */ 429 430 return 0; 431 } 432 433 /* --------------------------------------------------------------------- */ 434 435 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 436 /* XXX Should this operation be atomic? I think it should, but code in 437 * XXX other places (e.g., ufs) doesn't seem to be... */ 438 int 439 tmpfs_setattr(void *v) 440 { 441 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 442 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 443 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 444 struct lwp *l = curlwp; 445 446 int error; 447 448 KASSERT(VOP_ISLOCKED(vp)); 449 450 error = 0; 451 452 /* Abort if any unsettable attribute is given. */ 453 if (vap->va_type != VNON || 454 vap->va_nlink != VNOVAL || 455 vap->va_fsid != VNOVAL || 456 vap->va_fileid != VNOVAL || 457 vap->va_blocksize != VNOVAL || 458 GOODTIME(&vap->va_ctime) || 459 vap->va_gen != VNOVAL || 460 vap->va_rdev != VNOVAL || 461 vap->va_bytes != VNOVAL) 462 error = EINVAL; 463 464 if (error == 0 && (vap->va_flags != VNOVAL)) 465 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 466 467 if (error == 0 && (vap->va_size != VNOVAL)) 468 error = tmpfs_chsize(vp, vap->va_size, cred, l); 469 470 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 471 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 472 473 if (error == 0 && (vap->va_mode != VNOVAL)) 474 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 475 476 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 477 || GOODTIME(&vap->va_birthtime))) 478 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 479 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 480 return 0; 481 482 /* Update the node times. We give preference to the error codes 483 * generated by this function rather than the ones that may arise 484 * from tmpfs_update. */ 485 tmpfs_update(vp, NULL, NULL, NULL, 0); 486 487 KASSERT(VOP_ISLOCKED(vp)); 488 489 return error; 490 } 491 492 /* --------------------------------------------------------------------- */ 493 494 int 495 tmpfs_read(void *v) 496 { 497 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 498 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 499 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 500 501 int error; 502 struct tmpfs_node *node; 503 struct uvm_object *uobj; 504 505 KASSERT(VOP_ISLOCKED(vp)); 506 507 node = VP_TO_TMPFS_NODE(vp); 508 509 if (vp->v_type != VREG) { 510 error = EISDIR; 511 goto out; 512 } 513 514 if (uio->uio_offset < 0) { 515 error = EINVAL; 516 goto out; 517 } 518 519 node->tn_status |= TMPFS_NODE_ACCESSED; 520 521 uobj = node->tn_spec.tn_reg.tn_aobj; 522 error = 0; 523 while (error == 0 && uio->uio_resid > 0) { 524 vsize_t len; 525 526 if (node->tn_size <= uio->uio_offset) 527 break; 528 529 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 530 if (len == 0) 531 break; 532 533 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 534 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 535 } 536 537 out: 538 KASSERT(VOP_ISLOCKED(vp)); 539 540 return error; 541 } 542 543 /* --------------------------------------------------------------------- */ 544 545 int 546 tmpfs_write(void *v) 547 { 548 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 549 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 550 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 551 552 bool extended; 553 int error; 554 off_t oldsize; 555 struct tmpfs_node *node; 556 struct uvm_object *uobj; 557 558 KASSERT(VOP_ISLOCKED(vp)); 559 560 node = VP_TO_TMPFS_NODE(vp); 561 oldsize = node->tn_size; 562 563 if (uio->uio_offset < 0 || vp->v_type != VREG) { 564 error = EINVAL; 565 goto out; 566 } 567 568 if (uio->uio_resid == 0) { 569 error = 0; 570 goto out; 571 } 572 573 if (ioflag & IO_APPEND) 574 uio->uio_offset = node->tn_size; 575 576 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 577 if (extended) { 578 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 579 if (error != 0) 580 goto out; 581 } 582 583 uobj = node->tn_spec.tn_reg.tn_aobj; 584 error = 0; 585 while (error == 0 && uio->uio_resid > 0) { 586 vsize_t len; 587 588 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 589 if (len == 0) 590 break; 591 592 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 593 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 594 } 595 596 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 597 (extended ? TMPFS_NODE_CHANGED : 0); 598 599 if (error != 0) 600 (void)tmpfs_reg_resize(vp, oldsize); 601 602 VN_KNOTE(vp, NOTE_WRITE); 603 604 out: 605 KASSERT(VOP_ISLOCKED(vp)); 606 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 607 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 608 609 return error; 610 } 611 612 /* --------------------------------------------------------------------- */ 613 614 int 615 tmpfs_fsync(void *v) 616 { 617 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 618 619 KASSERT(VOP_ISLOCKED(vp)); 620 621 tmpfs_update(vp, NULL, NULL, NULL, 0); 622 623 return 0; 624 } 625 626 /* --------------------------------------------------------------------- */ 627 628 int 629 tmpfs_remove(void *v) 630 { 631 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 632 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 633 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 634 635 int error; 636 struct tmpfs_dirent *de; 637 struct tmpfs_mount *tmp; 638 struct tmpfs_node *dnode; 639 struct tmpfs_node *node; 640 641 KASSERT(VOP_ISLOCKED(dvp)); 642 KASSERT(VOP_ISLOCKED(vp)); 643 644 if (vp->v_type == VDIR) { 645 error = EPERM; 646 goto out; 647 } 648 649 dnode = VP_TO_TMPFS_DIR(dvp); 650 node = VP_TO_TMPFS_NODE(vp); 651 tmp = VFS_TO_TMPFS(vp->v_mount); 652 de = tmpfs_dir_lookup(dnode, cnp); 653 if (de == NULL) { 654 error = ENOENT; 655 goto out; 656 } 657 KASSERT(de->td_node == node); 658 659 /* Files marked as immutable or append-only cannot be deleted. */ 660 if (node->tn_flags & (IMMUTABLE | APPEND)) { 661 error = EPERM; 662 goto out; 663 } 664 665 /* Remove the entry from the directory; as it is a file, we do not 666 * have to change the number of hard links of the directory. */ 667 tmpfs_dir_detach(dvp, de); 668 669 /* Free the directory entry we just deleted. Note that the node 670 * referred by it will not be removed until the vnode is really 671 * reclaimed. */ 672 tmpfs_free_dirent(tmp, de, true); 673 674 error = 0; 675 676 out: 677 vput(vp); 678 if (dvp == vp) 679 vrele(dvp); 680 else 681 vput(dvp); 682 683 return error; 684 } 685 686 /* --------------------------------------------------------------------- */ 687 688 int 689 tmpfs_link(void *v) 690 { 691 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 692 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 693 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 694 695 int error; 696 struct tmpfs_dirent *de; 697 struct tmpfs_node *dnode; 698 struct tmpfs_node *node; 699 700 KASSERT(VOP_ISLOCKED(dvp)); 701 KASSERT(cnp->cn_flags & HASBUF); 702 KASSERT(dvp != vp); /* XXX When can this be false? */ 703 704 dnode = VP_TO_TMPFS_DIR(dvp); 705 node = VP_TO_TMPFS_NODE(vp); 706 707 /* Lock vp because we will need to run tmpfs_update over it, which 708 * needs the vnode to be locked. */ 709 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 710 if (error != 0) 711 goto out1; 712 713 /* XXX: Why aren't the following two tests done by the caller? */ 714 715 /* Hard links of directories are forbidden. */ 716 if (vp->v_type == VDIR) { 717 error = EPERM; 718 goto out; 719 } 720 721 /* Cannot create cross-device links. */ 722 if (dvp->v_mount != vp->v_mount) { 723 error = EXDEV; 724 goto out; 725 } 726 727 /* Ensure that we do not overflow the maximum number of links imposed 728 * by the system. */ 729 KASSERT(node->tn_links <= LINK_MAX); 730 if (node->tn_links == LINK_MAX) { 731 error = EMLINK; 732 goto out; 733 } 734 735 /* We cannot create links of files marked immutable or append-only. */ 736 if (node->tn_flags & (IMMUTABLE | APPEND)) { 737 error = EPERM; 738 goto out; 739 } 740 741 /* Allocate a new directory entry to represent the node. */ 742 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 743 cnp->cn_nameptr, cnp->cn_namelen, &de); 744 if (error != 0) 745 goto out; 746 747 /* Insert the new directory entry into the appropriate directory. */ 748 tmpfs_dir_attach(dvp, de); 749 750 /* vp link count has changed, so update node times. */ 751 node->tn_status |= TMPFS_NODE_CHANGED; 752 tmpfs_update(vp, NULL, NULL, NULL, 0); 753 754 error = 0; 755 756 out: 757 VOP_UNLOCK(vp, 0); 758 out1: 759 PNBUF_PUT(cnp->cn_pnbuf); 760 761 vput(dvp); 762 763 return error; 764 } 765 766 /* --------------------------------------------------------------------- */ 767 768 int 769 tmpfs_rename(void *v) 770 { 771 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 772 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 773 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 774 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 775 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 776 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 777 778 char *newname; 779 int error; 780 struct tmpfs_dirent *de, *de2; 781 struct tmpfs_mount *tmp; 782 struct tmpfs_node *fdnode; 783 struct tmpfs_node *fnode; 784 struct tmpfs_node *tnode; 785 struct tmpfs_node *tdnode; 786 size_t namelen; 787 788 KASSERT(VOP_ISLOCKED(tdvp)); 789 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 790 KASSERT(fcnp->cn_flags & HASBUF); 791 KASSERT(tcnp->cn_flags & HASBUF); 792 793 newname = NULL; 794 namelen = 0; 795 tmp = NULL; 796 797 /* Disallow cross-device renames. */ 798 if (fvp->v_mount != tdvp->v_mount || 799 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 800 error = EXDEV; 801 goto out_unlocked; 802 } 803 804 fnode = VP_TO_TMPFS_NODE(fvp); 805 fdnode = VP_TO_TMPFS_DIR(fdvp); 806 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 807 tdnode = VP_TO_TMPFS_DIR(tdvp); 808 tmp = VFS_TO_TMPFS(tdvp->v_mount); 809 810 /* If we need to move the directory between entries, lock the 811 * source so that we can safely operate on it. */ 812 813 /* XXX: this is a potential locking order violation! */ 814 if (fdnode != tdnode) { 815 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 816 if (error != 0) 817 goto out_unlocked; 818 } 819 820 de = tmpfs_dir_lookup(fdnode, fcnp); 821 if (de == NULL) { 822 error = ENOENT; 823 goto out; 824 } 825 KASSERT(de->td_node == fnode); 826 827 /* If source and target are the same file, there is nothing to do. */ 828 if (fvp == tvp) { 829 error = 0; 830 goto out; 831 } 832 833 /* Avoid manipulating '.' and '..' entries. */ 834 if (de == NULL) { 835 KASSERT(fvp->v_type == VDIR); 836 error = EINVAL; 837 goto out; 838 } 839 KASSERT(de->td_node == fnode); 840 841 /* If replacing an existing entry, ensure we can do the operation. */ 842 if (tvp != NULL) { 843 KASSERT(tnode != NULL); 844 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 845 if (tnode->tn_size > 0) { 846 error = ENOTEMPTY; 847 goto out; 848 } 849 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 850 error = ENOTDIR; 851 goto out; 852 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 853 error = EISDIR; 854 goto out; 855 } else { 856 KASSERT(fnode->tn_type != VDIR && 857 tnode->tn_type != VDIR); 858 } 859 } 860 861 /* Ensure that we have enough memory to hold the new name, if it 862 * has to be changed. */ 863 namelen = tcnp->cn_namelen; 864 if (fcnp->cn_namelen != tcnp->cn_namelen || 865 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 866 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 867 if (newname == NULL) { 868 error = ENOSPC; 869 goto out; 870 } 871 } 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; 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 we are overwriting an entry, we have to remove the old one 916 * from the target directory. */ 917 if (tvp != NULL) { 918 KASSERT(tnode != NULL); 919 920 /* Remove the old entry from the target directory. 921 * Note! This relies on tmpfs_dir_attach() putting the new 922 * node on the end of the target's node list. */ 923 de2 = tmpfs_dir_lookup(tdnode, tcnp); 924 KASSERT(de2 != NULL); 925 KASSERT(de2->td_node == tnode); 926 tmpfs_dir_detach(tdvp, de2); 927 928 /* Free the directory entry we just deleted. Note that the 929 * node referred by it will not be removed until the vnode is 930 * really reclaimed. */ 931 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 932 } 933 934 /* If the name has changed, we need to make it effective by changing 935 * it in the directory entry. */ 936 if (newname != NULL) { 937 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 938 KASSERT(tcnp->cn_namelen < 0xffff); 939 940 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 941 de->td_namelen); 942 de->td_namelen = (uint16_t)namelen; 943 memcpy(newname, tcnp->cn_nameptr, namelen); 944 de->td_name = newname; 945 newname = NULL; 946 947 fnode->tn_status |= TMPFS_NODE_CHANGED; 948 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 949 } 950 951 /* Notify listeners of tdvp about the change in the directory (either 952 * because a new entry was added or because one was removed) and 953 * listeners of fvp about the rename. */ 954 VN_KNOTE(tdvp, NOTE_WRITE); 955 VN_KNOTE(fvp, NOTE_RENAME); 956 957 error = 0; 958 959 out: 960 if (fdnode != tdnode) 961 VOP_UNLOCK(fdvp, 0); 962 963 out_unlocked: 964 /* Release target nodes. */ 965 if (tdvp == tvp) 966 vrele(tdvp); 967 else 968 vput(tdvp); 969 if (tvp != NULL) 970 vput(tvp); 971 972 /* Release source nodes. */ 973 vrele(fdvp); 974 vrele(fvp); 975 976 if (newname != NULL) 977 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 978 979 return error; 980 } 981 982 /* --------------------------------------------------------------------- */ 983 984 int 985 tmpfs_mkdir(void *v) 986 { 987 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 988 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 989 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 990 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 991 992 KASSERT(vap->va_type == VDIR); 993 994 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 995 } 996 997 /* --------------------------------------------------------------------- */ 998 999 int 1000 tmpfs_rmdir(void *v) 1001 { 1002 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1003 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1004 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1005 1006 int error; 1007 struct tmpfs_dirent *de; 1008 struct tmpfs_mount *tmp; 1009 struct tmpfs_node *dnode; 1010 struct tmpfs_node *node; 1011 1012 KASSERT(VOP_ISLOCKED(dvp)); 1013 KASSERT(VOP_ISLOCKED(vp)); 1014 1015 tmp = VFS_TO_TMPFS(dvp->v_mount); 1016 dnode = VP_TO_TMPFS_DIR(dvp); 1017 node = VP_TO_TMPFS_DIR(vp); 1018 error = 0; 1019 1020 /* Directories with more than two entries ('.' and '..') cannot be 1021 * removed. */ 1022 if (node->tn_size > 0) { 1023 error = ENOTEMPTY; 1024 goto out; 1025 } 1026 1027 /* This invariant holds only if we are not trying to remove "..". 1028 * We checked for that above so this is safe now. */ 1029 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1030 1031 /* Get the directory entry associated with node (vp). */ 1032 de = tmpfs_dir_lookup(dnode, cnp); 1033 if (de == NULL) { 1034 error = ENOENT; 1035 goto out; 1036 } 1037 KASSERT(de->td_node == node); 1038 1039 /* Check flags to see if we are allowed to remove the directory. */ 1040 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1041 error = EPERM; 1042 goto out; 1043 } 1044 1045 /* Detach the directory entry from the directory (dnode). */ 1046 tmpfs_dir_detach(dvp, de); 1047 1048 node->tn_links--; 1049 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1050 TMPFS_NODE_MODIFIED; 1051 node->tn_spec.tn_dir.tn_parent->tn_links--; 1052 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1053 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1054 1055 /* Release the parent. */ 1056 cache_purge(dvp); /* XXX Is this needed? */ 1057 1058 /* Free the directory entry we just deleted. Note that the node 1059 * referred by it will not be removed until the vnode is really 1060 * reclaimed. */ 1061 tmpfs_free_dirent(tmp, de, true); 1062 1063 KASSERT(node->tn_links == 0); 1064 out: 1065 /* Release the nodes. */ 1066 vput(dvp); 1067 vput(vp); 1068 1069 return error; 1070 } 1071 1072 /* --------------------------------------------------------------------- */ 1073 1074 int 1075 tmpfs_symlink(void *v) 1076 { 1077 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1078 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1079 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1080 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1081 char *target = ((struct vop_symlink_args *)v)->a_target; 1082 1083 KASSERT(vap->va_type == VLNK); 1084 1085 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1086 } 1087 1088 /* --------------------------------------------------------------------- */ 1089 1090 int 1091 tmpfs_readdir(void *v) 1092 { 1093 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1094 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1095 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1096 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1097 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1098 1099 int error; 1100 off_t startoff; 1101 off_t cnt; 1102 struct tmpfs_node *node; 1103 1104 KASSERT(VOP_ISLOCKED(vp)); 1105 1106 /* This operation only makes sense on directory nodes. */ 1107 if (vp->v_type != VDIR) { 1108 error = ENOTDIR; 1109 goto out; 1110 } 1111 1112 node = VP_TO_TMPFS_DIR(vp); 1113 1114 startoff = uio->uio_offset; 1115 1116 cnt = 0; 1117 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1118 error = tmpfs_dir_getdotdent(node, uio); 1119 if (error == -1) { 1120 error = 0; 1121 goto outok; 1122 } else if (error != 0) 1123 goto outok; 1124 cnt++; 1125 } 1126 1127 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1128 error = tmpfs_dir_getdotdotdent(node, uio); 1129 if (error == -1) { 1130 error = 0; 1131 goto outok; 1132 } else if (error != 0) 1133 goto outok; 1134 cnt++; 1135 } 1136 1137 error = tmpfs_dir_getdents(node, uio, &cnt); 1138 if (error == -1) 1139 error = 0; 1140 KASSERT(error >= 0); 1141 1142 outok: 1143 /* This label assumes that startoff has been 1144 * initialized. If the compiler didn't spit out warnings, we'd 1145 * simply make this one be 'out' and drop 'outok'. */ 1146 1147 if (eofflag != NULL) 1148 *eofflag = 1149 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1150 1151 /* Update NFS-related variables. */ 1152 if (error == 0 && cookies != NULL && ncookies != NULL) { 1153 off_t i; 1154 off_t off = startoff; 1155 struct tmpfs_dirent *de = NULL; 1156 1157 *ncookies = cnt; 1158 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1159 1160 for (i = 0; i < cnt; i++) { 1161 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1162 if (off == TMPFS_DIRCOOKIE_DOT) { 1163 off = TMPFS_DIRCOOKIE_DOTDOT; 1164 } else { 1165 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1166 de = TAILQ_FIRST(&node->tn_spec. 1167 tn_dir.tn_dir); 1168 } else if (de != NULL) { 1169 de = TAILQ_NEXT(de, td_entries); 1170 } else { 1171 de = tmpfs_dir_lookupbycookie(node, 1172 off); 1173 KASSERT(de != NULL); 1174 de = TAILQ_NEXT(de, td_entries); 1175 } 1176 if (de == NULL) { 1177 off = TMPFS_DIRCOOKIE_EOF; 1178 } else { 1179 off = tmpfs_dircookie(de); 1180 } 1181 } 1182 1183 (*cookies)[i] = off; 1184 } 1185 KASSERT(uio->uio_offset == off); 1186 } 1187 1188 out: 1189 KASSERT(VOP_ISLOCKED(vp)); 1190 1191 return error; 1192 } 1193 1194 /* --------------------------------------------------------------------- */ 1195 1196 int 1197 tmpfs_readlink(void *v) 1198 { 1199 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1200 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1201 1202 int error; 1203 struct tmpfs_node *node; 1204 1205 KASSERT(VOP_ISLOCKED(vp)); 1206 KASSERT(uio->uio_offset == 0); 1207 KASSERT(vp->v_type == VLNK); 1208 1209 node = VP_TO_TMPFS_NODE(vp); 1210 1211 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1212 MIN(node->tn_size, uio->uio_resid), uio); 1213 node->tn_status |= TMPFS_NODE_ACCESSED; 1214 1215 KASSERT(VOP_ISLOCKED(vp)); 1216 1217 return error; 1218 } 1219 1220 /* --------------------------------------------------------------------- */ 1221 1222 int 1223 tmpfs_inactive(void *v) 1224 { 1225 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1226 1227 struct tmpfs_node *node; 1228 1229 KASSERT(VOP_ISLOCKED(vp)); 1230 1231 node = VP_TO_TMPFS_NODE(vp); 1232 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1233 VOP_UNLOCK(vp, 0); 1234 1235 return 0; 1236 } 1237 1238 /* --------------------------------------------------------------------- */ 1239 1240 int 1241 tmpfs_reclaim(void *v) 1242 { 1243 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1244 1245 struct tmpfs_mount *tmp; 1246 struct tmpfs_node *node; 1247 1248 node = VP_TO_TMPFS_NODE(vp); 1249 tmp = VFS_TO_TMPFS(vp->v_mount); 1250 1251 cache_purge(vp); 1252 tmpfs_free_vp(vp); 1253 1254 /* If the node referenced by this vnode was deleted by the user, 1255 * we must free its associated data structures (now that the vnode 1256 * is being reclaimed). */ 1257 if (node->tn_links == 0) 1258 tmpfs_free_node(tmp, node); 1259 1260 KASSERT(vp->v_data == NULL); 1261 1262 return 0; 1263 } 1264 1265 /* --------------------------------------------------------------------- */ 1266 1267 int 1268 tmpfs_print(void *v) 1269 { 1270 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1271 1272 struct tmpfs_node *node; 1273 1274 node = VP_TO_TMPFS_NODE(vp); 1275 1276 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1277 node, node->tn_flags, node->tn_links); 1278 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1279 ", status 0x%x\n", 1280 node->tn_mode, node->tn_uid, node->tn_gid, 1281 (uintmax_t)node->tn_size, node->tn_status); 1282 if (vp->v_type == VFIFO) 1283 fifo_printinfo(vp); 1284 printf("\n"); 1285 1286 return 0; 1287 } 1288 1289 /* --------------------------------------------------------------------- */ 1290 1291 int 1292 tmpfs_pathconf(void *v) 1293 { 1294 int name = ((struct vop_pathconf_args *)v)->a_name; 1295 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1296 1297 int error; 1298 1299 error = 0; 1300 1301 switch (name) { 1302 case _PC_LINK_MAX: 1303 *retval = LINK_MAX; 1304 break; 1305 1306 case _PC_NAME_MAX: 1307 *retval = NAME_MAX; 1308 break; 1309 1310 case _PC_PATH_MAX: 1311 *retval = PATH_MAX; 1312 break; 1313 1314 case _PC_PIPE_BUF: 1315 *retval = PIPE_BUF; 1316 break; 1317 1318 case _PC_CHOWN_RESTRICTED: 1319 *retval = 1; 1320 break; 1321 1322 case _PC_NO_TRUNC: 1323 *retval = 1; 1324 break; 1325 1326 case _PC_SYNC_IO: 1327 *retval = 1; 1328 break; 1329 1330 case _PC_FILESIZEBITS: 1331 *retval = 0; /* XXX Don't know which value should I return. */ 1332 break; 1333 1334 default: 1335 error = EINVAL; 1336 } 1337 1338 return error; 1339 } 1340 1341 /* --------------------------------------------------------------------- */ 1342 1343 int 1344 tmpfs_advlock(void *v) 1345 { 1346 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1347 1348 struct tmpfs_node *node; 1349 1350 node = VP_TO_TMPFS_NODE(vp); 1351 1352 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1353 } 1354 1355 /* --------------------------------------------------------------------- */ 1356 1357 int 1358 tmpfs_getpages(void *v) 1359 { 1360 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1361 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1362 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1363 int *count = ((struct vop_getpages_args *)v)->a_count; 1364 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1365 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1366 int advice = ((struct vop_getpages_args *)v)->a_advice; 1367 int flags = ((struct vop_getpages_args *)v)->a_flags; 1368 1369 int error; 1370 int i; 1371 struct tmpfs_node *node; 1372 struct uvm_object *uobj; 1373 int npages = *count; 1374 1375 KASSERT(vp->v_type == VREG); 1376 KASSERT(mutex_owned(&vp->v_interlock)); 1377 1378 node = VP_TO_TMPFS_NODE(vp); 1379 uobj = node->tn_spec.tn_reg.tn_aobj; 1380 1381 /* We currently don't rely on PGO_PASTEOF. */ 1382 1383 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1384 if ((flags & PGO_LOCKED) == 0) 1385 mutex_exit(&vp->v_interlock); 1386 return EINVAL; 1387 } 1388 1389 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1390 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1391 } 1392 1393 if ((flags & PGO_LOCKED) != 0) 1394 return EBUSY; 1395 1396 if ((flags & PGO_NOTIMESTAMP) == 0) { 1397 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1398 node->tn_status |= TMPFS_NODE_ACCESSED; 1399 1400 if ((access_type & VM_PROT_WRITE) != 0) 1401 node->tn_status |= TMPFS_NODE_MODIFIED; 1402 } 1403 1404 mutex_exit(&vp->v_interlock); 1405 1406 /* 1407 * Make sure that the array on which we will store the 1408 * gotten pages is clean. Otherwise uao_get (pointed to by 1409 * the pgo_get below) gets confused and does not return the 1410 * appropriate pages. 1411 * 1412 * XXX This shall be revisited when kern/32166 is addressed 1413 * because the loop to clean m[i] will most likely be redundant 1414 * as well as the PGO_ALLPAGES flag. 1415 */ 1416 if (m != NULL) 1417 for (i = 0; i < npages; i++) 1418 m[i] = NULL; 1419 mutex_enter(&uobj->vmobjlock); 1420 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1421 access_type, advice, flags | PGO_ALLPAGES); 1422 #if defined(DEBUG) 1423 { 1424 /* Make sure that all the pages we return are valid. */ 1425 int dbgi; 1426 if (error == 0 && m != NULL) 1427 for (dbgi = 0; dbgi < npages; dbgi++) 1428 KASSERT(m[dbgi] != NULL); 1429 } 1430 #endif 1431 1432 return error; 1433 } 1434 1435 /* --------------------------------------------------------------------- */ 1436 1437 int 1438 tmpfs_putpages(void *v) 1439 { 1440 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1441 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1442 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1443 int flags = ((struct vop_putpages_args *)v)->a_flags; 1444 1445 int error; 1446 struct tmpfs_node *node; 1447 struct uvm_object *uobj; 1448 1449 KASSERT(mutex_owned(&vp->v_interlock)); 1450 1451 node = VP_TO_TMPFS_NODE(vp); 1452 1453 if (vp->v_type != VREG) { 1454 mutex_exit(&vp->v_interlock); 1455 return 0; 1456 } 1457 1458 uobj = node->tn_spec.tn_reg.tn_aobj; 1459 mutex_exit(&vp->v_interlock); 1460 1461 mutex_enter(&uobj->vmobjlock); 1462 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1463 1464 /* XXX mtime */ 1465 1466 return error; 1467 } 1468