1 /* $NetBSD: tmpfs_vnops.c,v 1.60 2009/06/23 19:36:39 elad 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 1.60 2009/06/23 19:36:39 elad 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 <miscfs/genfs/genfs.h> 58 #include <fs/tmpfs/tmpfs_vnops.h> 59 #include <fs/tmpfs/tmpfs.h> 60 61 /* --------------------------------------------------------------------- */ 62 63 /* 64 * vnode operations vector used for files stored in a tmpfs file system. 65 */ 66 int (**tmpfs_vnodeop_p)(void *); 67 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 68 { &vop_default_desc, vn_default_error }, 69 { &vop_lookup_desc, tmpfs_lookup }, 70 { &vop_create_desc, tmpfs_create }, 71 { &vop_mknod_desc, tmpfs_mknod }, 72 { &vop_open_desc, tmpfs_open }, 73 { &vop_close_desc, tmpfs_close }, 74 { &vop_access_desc, tmpfs_access }, 75 { &vop_getattr_desc, tmpfs_getattr }, 76 { &vop_setattr_desc, tmpfs_setattr }, 77 { &vop_read_desc, tmpfs_read }, 78 { &vop_write_desc, tmpfs_write }, 79 { &vop_ioctl_desc, tmpfs_ioctl }, 80 { &vop_fcntl_desc, tmpfs_fcntl }, 81 { &vop_poll_desc, tmpfs_poll }, 82 { &vop_kqfilter_desc, tmpfs_kqfilter }, 83 { &vop_revoke_desc, tmpfs_revoke }, 84 { &vop_mmap_desc, tmpfs_mmap }, 85 { &vop_fsync_desc, tmpfs_fsync }, 86 { &vop_seek_desc, tmpfs_seek }, 87 { &vop_remove_desc, tmpfs_remove }, 88 { &vop_link_desc, tmpfs_link }, 89 { &vop_rename_desc, tmpfs_rename }, 90 { &vop_mkdir_desc, tmpfs_mkdir }, 91 { &vop_rmdir_desc, tmpfs_rmdir }, 92 { &vop_symlink_desc, tmpfs_symlink }, 93 { &vop_readdir_desc, tmpfs_readdir }, 94 { &vop_readlink_desc, tmpfs_readlink }, 95 { &vop_abortop_desc, tmpfs_abortop }, 96 { &vop_inactive_desc, tmpfs_inactive }, 97 { &vop_reclaim_desc, tmpfs_reclaim }, 98 { &vop_lock_desc, tmpfs_lock }, 99 { &vop_unlock_desc, tmpfs_unlock }, 100 { &vop_bmap_desc, tmpfs_bmap }, 101 { &vop_strategy_desc, tmpfs_strategy }, 102 { &vop_print_desc, tmpfs_print }, 103 { &vop_pathconf_desc, tmpfs_pathconf }, 104 { &vop_islocked_desc, tmpfs_islocked }, 105 { &vop_advlock_desc, tmpfs_advlock }, 106 { &vop_bwrite_desc, tmpfs_bwrite }, 107 { &vop_getpages_desc, tmpfs_getpages }, 108 { &vop_putpages_desc, tmpfs_putpages }, 109 { NULL, NULL } 110 }; 111 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 112 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 113 114 /* --------------------------------------------------------------------- */ 115 116 int 117 tmpfs_lookup(void *v) 118 { 119 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 120 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 121 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 122 123 int error; 124 struct tmpfs_dirent *de; 125 struct tmpfs_node *dnode; 126 127 KASSERT(VOP_ISLOCKED(dvp)); 128 129 dnode = VP_TO_TMPFS_DIR(dvp); 130 *vpp = NULL; 131 132 /* Check accessibility of requested node as a first step. */ 133 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 134 if (error != 0) 135 goto out; 136 137 /* If requesting the last path component on a read-only file system 138 * with a write operation, deny it. */ 139 if ((cnp->cn_flags & ISLASTCN) && 140 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 141 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 142 error = EROFS; 143 goto out; 144 } 145 146 /* Avoid doing a linear scan of the directory if the requested 147 * directory/name couple is already in the cache. */ 148 error = cache_lookup(dvp, vpp, cnp); 149 if (error >= 0) 150 goto out; 151 152 /* We cannot be requesting the parent directory of the root node. */ 153 KASSERT(IMPLIES(dnode->tn_type == VDIR && 154 dnode->tn_spec.tn_dir.tn_parent == dnode, 155 !(cnp->cn_flags & ISDOTDOT))); 156 157 if (cnp->cn_flags & ISDOTDOT) { 158 VOP_UNLOCK(dvp, 0); 159 160 /* Allocate a new vnode on the matching entry. */ 161 error = tmpfs_alloc_vp(dvp->v_mount, 162 dnode->tn_spec.tn_dir.tn_parent, vpp); 163 164 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 165 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 166 VREF(dvp); 167 *vpp = dvp; 168 error = 0; 169 } else { 170 de = tmpfs_dir_lookup(dnode, cnp); 171 if (de == NULL) { 172 /* The entry was not found in the directory. 173 * This is OK iff we are creating or renaming an 174 * entry and are working on the last component of 175 * the path name. */ 176 if ((cnp->cn_flags & ISLASTCN) && 177 (cnp->cn_nameiop == CREATE || \ 178 cnp->cn_nameiop == RENAME)) { 179 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 180 if (error != 0) 181 goto out; 182 183 /* Keep the component name in the buffer for 184 * future uses. */ 185 cnp->cn_flags |= SAVENAME; 186 187 error = EJUSTRETURN; 188 } else 189 error = ENOENT; 190 } else { 191 struct tmpfs_node *tnode; 192 193 /* The entry was found, so get its associated 194 * tmpfs_node. */ 195 tnode = de->td_node; 196 197 /* If we are not at the last path component and 198 * found a non-directory or non-link entry (which 199 * may itself be pointing to a directory), raise 200 * an error. */ 201 if ((tnode->tn_type != VDIR && 202 tnode->tn_type != VLNK) && 203 !(cnp->cn_flags & ISLASTCN)) { 204 error = ENOTDIR; 205 goto out; 206 } 207 208 /* Check permissions */ 209 if ((cnp->cn_flags & ISLASTCN) && 210 (cnp->cn_nameiop == DELETE || 211 cnp->cn_nameiop == RENAME)) { 212 if ((dnode->tn_mode & S_ISTXT) != 0 && 213 kauth_authorize_generic(cnp->cn_cred, 214 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 215 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 216 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 217 return EPERM; 218 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 219 if (error != 0) 220 goto out; 221 cnp->cn_flags |= SAVENAME; 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 vput(dvp); 275 return EINVAL; 276 } 277 278 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 279 } 280 281 /* --------------------------------------------------------------------- */ 282 283 int 284 tmpfs_open(void *v) 285 { 286 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 287 int mode = ((struct vop_open_args *)v)->a_mode; 288 289 int error; 290 struct tmpfs_node *node; 291 292 KASSERT(VOP_ISLOCKED(vp)); 293 294 node = VP_TO_TMPFS_NODE(vp); 295 296 /* The file is still active but all its names have been removed 297 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 298 * it is about to die. */ 299 if (node->tn_links < 1) { 300 error = ENOENT; 301 goto out; 302 } 303 304 /* If the file is marked append-only, deny write requests. */ 305 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 306 error = EPERM; 307 else 308 error = 0; 309 310 out: 311 KASSERT(VOP_ISLOCKED(vp)); 312 313 return error; 314 } 315 316 /* --------------------------------------------------------------------- */ 317 318 int 319 tmpfs_close(void *v) 320 { 321 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 322 323 struct tmpfs_node *node; 324 325 KASSERT(VOP_ISLOCKED(vp)); 326 327 node = VP_TO_TMPFS_NODE(vp); 328 329 if (node->tn_links > 0) { 330 /* Update node times. No need to do it if the node has 331 * been deleted, because it will vanish after we return. */ 332 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 333 } 334 335 return 0; 336 } 337 338 /* --------------------------------------------------------------------- */ 339 340 int 341 tmpfs_access(void *v) 342 { 343 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 344 int mode = ((struct vop_access_args *)v)->a_mode; 345 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 346 347 int error; 348 struct tmpfs_node *node; 349 350 KASSERT(VOP_ISLOCKED(vp)); 351 352 node = VP_TO_TMPFS_NODE(vp); 353 354 switch (vp->v_type) { 355 case VDIR: 356 /* FALLTHROUGH */ 357 case VLNK: 358 /* FALLTHROUGH */ 359 case VREG: 360 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 361 error = EROFS; 362 goto out; 363 } 364 break; 365 366 case VBLK: 367 /* FALLTHROUGH */ 368 case VCHR: 369 /* FALLTHROUGH */ 370 case VSOCK: 371 /* FALLTHROUGH */ 372 case VFIFO: 373 break; 374 375 default: 376 error = EINVAL; 377 goto out; 378 } 379 380 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 381 error = EPERM; 382 goto out; 383 } 384 385 error = genfs_can_access(vp->v_type, node->tn_mode, node->tn_uid, 386 node->tn_gid, mode, cred); 387 388 out: 389 KASSERT(VOP_ISLOCKED(vp)); 390 391 return error; 392 } 393 394 /* --------------------------------------------------------------------- */ 395 396 int 397 tmpfs_getattr(void *v) 398 { 399 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 400 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 401 402 struct tmpfs_node *node; 403 404 node = VP_TO_TMPFS_NODE(vp); 405 406 VATTR_NULL(vap); 407 408 tmpfs_itimes(vp, NULL, NULL, NULL); 409 410 vap->va_type = vp->v_type; 411 vap->va_mode = node->tn_mode; 412 vap->va_nlink = node->tn_links; 413 vap->va_uid = node->tn_uid; 414 vap->va_gid = node->tn_gid; 415 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 416 vap->va_fileid = node->tn_id; 417 vap->va_size = node->tn_size; 418 vap->va_blocksize = PAGE_SIZE; 419 vap->va_atime = node->tn_atime; 420 vap->va_mtime = node->tn_mtime; 421 vap->va_ctime = node->tn_ctime; 422 vap->va_birthtime = node->tn_birthtime; 423 vap->va_gen = node->tn_gen; 424 vap->va_flags = node->tn_flags; 425 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 426 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 427 vap->va_bytes = round_page(node->tn_size); 428 vap->va_filerev = VNOVAL; 429 vap->va_vaflags = 0; 430 vap->va_spare = VNOVAL; /* XXX */ 431 432 return 0; 433 } 434 435 /* --------------------------------------------------------------------- */ 436 437 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 438 /* XXX Should this operation be atomic? I think it should, but code in 439 * XXX other places (e.g., ufs) doesn't seem to be... */ 440 int 441 tmpfs_setattr(void *v) 442 { 443 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 444 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 445 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 446 struct lwp *l = curlwp; 447 448 int error; 449 450 KASSERT(VOP_ISLOCKED(vp)); 451 452 error = 0; 453 454 /* Abort if any unsettable attribute is given. */ 455 if (vap->va_type != VNON || 456 vap->va_nlink != VNOVAL || 457 vap->va_fsid != VNOVAL || 458 vap->va_fileid != VNOVAL || 459 vap->va_blocksize != VNOVAL || 460 GOODTIME(&vap->va_ctime) || 461 vap->va_gen != VNOVAL || 462 vap->va_rdev != VNOVAL || 463 vap->va_bytes != VNOVAL) 464 error = EINVAL; 465 466 if (error == 0 && (vap->va_flags != VNOVAL)) 467 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 468 469 if (error == 0 && (vap->va_size != VNOVAL)) 470 error = tmpfs_chsize(vp, vap->va_size, cred, l); 471 472 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 473 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 474 475 if (error == 0 && (vap->va_mode != VNOVAL)) 476 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 477 478 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 479 || GOODTIME(&vap->va_birthtime))) 480 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 481 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 482 return 0; 483 484 /* Update the node times. We give preference to the error codes 485 * generated by this function rather than the ones that may arise 486 * from tmpfs_update. */ 487 tmpfs_update(vp, NULL, NULL, NULL, 0); 488 489 KASSERT(VOP_ISLOCKED(vp)); 490 491 return error; 492 } 493 494 /* --------------------------------------------------------------------- */ 495 496 int 497 tmpfs_read(void *v) 498 { 499 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 500 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 501 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 502 503 int error; 504 struct tmpfs_node *node; 505 struct uvm_object *uobj; 506 507 KASSERT(VOP_ISLOCKED(vp)); 508 509 node = VP_TO_TMPFS_NODE(vp); 510 511 if (vp->v_type != VREG) { 512 error = EISDIR; 513 goto out; 514 } 515 516 if (uio->uio_offset < 0) { 517 error = EINVAL; 518 goto out; 519 } 520 521 node->tn_status |= TMPFS_NODE_ACCESSED; 522 523 uobj = node->tn_spec.tn_reg.tn_aobj; 524 error = 0; 525 while (error == 0 && uio->uio_resid > 0) { 526 vsize_t len; 527 528 if (node->tn_size <= uio->uio_offset) 529 break; 530 531 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 532 if (len == 0) 533 break; 534 535 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 536 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 537 } 538 539 out: 540 KASSERT(VOP_ISLOCKED(vp)); 541 542 return error; 543 } 544 545 /* --------------------------------------------------------------------- */ 546 547 int 548 tmpfs_write(void *v) 549 { 550 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 551 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 552 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 553 554 bool extended; 555 int error; 556 off_t oldsize; 557 struct tmpfs_node *node; 558 struct uvm_object *uobj; 559 560 KASSERT(VOP_ISLOCKED(vp)); 561 562 node = VP_TO_TMPFS_NODE(vp); 563 oldsize = node->tn_size; 564 565 if (uio->uio_offset < 0 || vp->v_type != VREG) { 566 error = EINVAL; 567 goto out; 568 } 569 570 if (uio->uio_resid == 0) { 571 error = 0; 572 goto out; 573 } 574 575 if (ioflag & IO_APPEND) 576 uio->uio_offset = node->tn_size; 577 578 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 579 if (extended) { 580 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 581 if (error != 0) 582 goto out; 583 } 584 585 uobj = node->tn_spec.tn_reg.tn_aobj; 586 error = 0; 587 while (error == 0 && uio->uio_resid > 0) { 588 vsize_t len; 589 590 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 591 if (len == 0) 592 break; 593 594 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 595 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 596 } 597 598 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 599 (extended ? TMPFS_NODE_CHANGED : 0); 600 601 if (error != 0) 602 (void)tmpfs_reg_resize(vp, oldsize); 603 604 VN_KNOTE(vp, NOTE_WRITE); 605 606 out: 607 KASSERT(VOP_ISLOCKED(vp)); 608 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 609 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 610 611 return error; 612 } 613 614 /* --------------------------------------------------------------------- */ 615 616 int 617 tmpfs_fsync(void *v) 618 { 619 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 620 621 KASSERT(VOP_ISLOCKED(vp)); 622 623 tmpfs_update(vp, NULL, NULL, NULL, 0); 624 625 return 0; 626 } 627 628 /* --------------------------------------------------------------------- */ 629 630 int 631 tmpfs_remove(void *v) 632 { 633 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 634 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 635 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 636 637 int error; 638 struct tmpfs_dirent *de; 639 struct tmpfs_mount *tmp; 640 struct tmpfs_node *dnode; 641 struct tmpfs_node *node; 642 643 KASSERT(VOP_ISLOCKED(dvp)); 644 KASSERT(VOP_ISLOCKED(vp)); 645 646 if (vp->v_type == VDIR) { 647 error = EPERM; 648 goto out; 649 } 650 651 dnode = VP_TO_TMPFS_DIR(dvp); 652 node = VP_TO_TMPFS_NODE(vp); 653 tmp = VFS_TO_TMPFS(vp->v_mount); 654 de = tmpfs_dir_lookup(dnode, cnp); 655 KASSERT(de); 656 KASSERT(de->td_node == node); 657 658 /* Files marked as immutable or append-only cannot be deleted. */ 659 if (node->tn_flags & (IMMUTABLE | APPEND)) { 660 error = EPERM; 661 goto out; 662 } 663 664 /* Remove the entry from the directory; as it is a file, we do not 665 * have to change the number of hard links of the directory. */ 666 tmpfs_dir_detach(dvp, de); 667 668 /* Free the directory entry we just deleted. Note that the node 669 * referred by it will not be removed until the vnode is really 670 * reclaimed. */ 671 tmpfs_free_dirent(tmp, de, true); 672 673 error = 0; 674 675 out: 676 vput(vp); 677 if (dvp == vp) 678 vrele(dvp); 679 else 680 vput(dvp); 681 PNBUF_PUT(cnp->cn_pnbuf); 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 (fdvp == tvp) { 811 error = 0; 812 goto out_unlocked; 813 } 814 815 /* If we need to move the directory between entries, lock the 816 * source so that we can safely operate on it. */ 817 818 /* XXX: this is a potential locking order violation! */ 819 if (fdnode != tdnode) { 820 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 821 if (error != 0) 822 goto out_unlocked; 823 } 824 825 /* 826 * If the node we were renaming has scarpered, just give up. 827 */ 828 de = tmpfs_dir_lookup(fdnode, fcnp); 829 if (de == NULL || de->td_node != fnode) { 830 error = ENOENT; 831 goto out; 832 } 833 834 /* If source and target are the same file, there is nothing to do. */ 835 if (fvp == tvp) { 836 error = 0; 837 goto out; 838 } 839 840 /* If replacing an existing entry, ensure we can do the operation. */ 841 if (tvp != NULL) { 842 KASSERT(tnode != NULL); 843 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 844 if (tnode->tn_size > 0) { 845 error = ENOTEMPTY; 846 goto out; 847 } 848 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 849 error = ENOTDIR; 850 goto out; 851 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 852 error = EISDIR; 853 goto out; 854 } else { 855 KASSERT(fnode->tn_type != VDIR && 856 tnode->tn_type != VDIR); 857 } 858 } 859 860 /* Ensure that we have enough memory to hold the new name, if it 861 * has to be changed. */ 862 namelen = tcnp->cn_namelen; 863 if (fcnp->cn_namelen != tcnp->cn_namelen || 864 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 865 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 866 if (newname == NULL) { 867 error = ENOSPC; 868 goto out; 869 } 870 } 871 872 /* If the node is being moved to another directory, we have to do 873 * the move. */ 874 if (fdnode != tdnode) { 875 /* In case we are moving a directory, we have to adjust its 876 * parent to point to the new parent. */ 877 if (de->td_node->tn_type == VDIR) { 878 struct tmpfs_node *n; 879 880 /* Ensure the target directory is not a child of the 881 * directory being moved. Otherwise, we'd end up 882 * with stale nodes. */ 883 n = tdnode; 884 while (n != n->tn_spec.tn_dir.tn_parent) { 885 if (n == fnode) { 886 error = EINVAL; 887 goto out; 888 } 889 n = n->tn_spec.tn_dir.tn_parent; 890 } 891 892 /* Adjust the parent pointer. */ 893 TMPFS_VALIDATE_DIR(fnode); 894 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 895 896 /* As a result of changing the target of the '..' 897 * entry, the link count of the source and target 898 * directories has to be adjusted. */ 899 fdnode->tn_links--; 900 tdnode->tn_links++; 901 } 902 903 /* Do the move: just remove the entry from the source directory 904 * and insert it into the target one. */ 905 tmpfs_dir_detach(fdvp, de); 906 tmpfs_dir_attach(tdvp, de); 907 908 /* Notify listeners of fdvp about the change in the directory. 909 * We can do it at this point because we aren't touching fdvp 910 * any more below. */ 911 VN_KNOTE(fdvp, NOTE_WRITE); 912 } 913 914 /* If we are overwriting an entry, we have to remove the old one 915 * from the target directory. */ 916 if (tvp != NULL) { 917 KASSERT(tnode != NULL); 918 919 /* Remove the old entry from the target directory. 920 * Note! This relies on tmpfs_dir_attach() putting the new 921 * node on the end of the target's node list. */ 922 de2 = tmpfs_dir_lookup(tdnode, tcnp); 923 KASSERT(de2 != NULL); 924 KASSERT(de2->td_node == tnode); 925 tmpfs_dir_detach(tdvp, de2); 926 927 /* Free the directory entry we just deleted. Note that the 928 * node referred by it will not be removed until the vnode is 929 * really reclaimed. */ 930 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 931 } 932 933 /* If the name has changed, we need to make it effective by changing 934 * it in the directory entry. */ 935 if (newname != NULL) { 936 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 937 KASSERT(tcnp->cn_namelen < 0xffff); 938 939 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 940 de->td_namelen); 941 de->td_namelen = (uint16_t)namelen; 942 memcpy(newname, tcnp->cn_nameptr, namelen); 943 de->td_name = newname; 944 newname = NULL; 945 946 fnode->tn_status |= TMPFS_NODE_CHANGED; 947 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 948 } 949 950 /* Notify listeners of tdvp about the change in the directory (either 951 * because a new entry was added or because one was removed) and 952 * listeners of fvp about the rename. */ 953 VN_KNOTE(tdvp, NOTE_WRITE); 954 VN_KNOTE(fvp, NOTE_RENAME); 955 956 error = 0; 957 958 out: 959 if (fdnode != tdnode) 960 VOP_UNLOCK(fdvp, 0); 961 962 out_unlocked: 963 /* Release target nodes. */ 964 if (tdvp == tvp) 965 vrele(tdvp); 966 else 967 vput(tdvp); 968 if (tvp != NULL) 969 vput(tvp); 970 971 /* Release source nodes. */ 972 vrele(fdvp); 973 vrele(fvp); 974 975 if (newname != NULL) 976 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 977 978 return error; 979 } 980 981 /* --------------------------------------------------------------------- */ 982 983 int 984 tmpfs_mkdir(void *v) 985 { 986 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 987 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 988 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 989 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 990 991 KASSERT(vap->va_type == VDIR); 992 993 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 994 } 995 996 /* --------------------------------------------------------------------- */ 997 998 int 999 tmpfs_rmdir(void *v) 1000 { 1001 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1002 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1003 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1004 1005 int error; 1006 struct tmpfs_dirent *de; 1007 struct tmpfs_mount *tmp; 1008 struct tmpfs_node *dnode; 1009 struct tmpfs_node *node; 1010 1011 KASSERT(VOP_ISLOCKED(dvp)); 1012 KASSERT(VOP_ISLOCKED(vp)); 1013 1014 tmp = VFS_TO_TMPFS(dvp->v_mount); 1015 dnode = VP_TO_TMPFS_DIR(dvp); 1016 node = VP_TO_TMPFS_DIR(vp); 1017 error = 0; 1018 1019 /* Directories with more than two entries ('.' and '..') cannot be 1020 * removed. */ 1021 if (node->tn_size > 0) { 1022 error = ENOTEMPTY; 1023 goto out; 1024 } 1025 1026 /* This invariant holds only if we are not trying to remove "..". 1027 * We checked for that above so this is safe now. */ 1028 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1029 1030 /* Get the directory entry associated with node (vp). */ 1031 de = tmpfs_dir_lookup(dnode, cnp); 1032 KASSERT(de); 1033 KASSERT(de->td_node == node); 1034 1035 /* Check flags to see if we are allowed to remove the directory. */ 1036 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1037 error = EPERM; 1038 goto out; 1039 } 1040 1041 /* Detach the directory entry from the directory (dnode). */ 1042 tmpfs_dir_detach(dvp, de); 1043 1044 node->tn_links--; 1045 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1046 TMPFS_NODE_MODIFIED; 1047 node->tn_spec.tn_dir.tn_parent->tn_links--; 1048 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1049 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1050 1051 /* Release the parent. */ 1052 cache_purge(dvp); /* XXX Is this needed? */ 1053 1054 /* Free the directory entry we just deleted. Note that the node 1055 * referred by it will not be removed until the vnode is really 1056 * reclaimed. */ 1057 tmpfs_free_dirent(tmp, de, true); 1058 1059 KASSERT(node->tn_links == 0); 1060 out: 1061 /* Release the nodes. */ 1062 vput(dvp); 1063 vput(vp); 1064 PNBUF_PUT(cnp->cn_pnbuf); 1065 1066 return error; 1067 } 1068 1069 /* --------------------------------------------------------------------- */ 1070 1071 int 1072 tmpfs_symlink(void *v) 1073 { 1074 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1075 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1076 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1077 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1078 char *target = ((struct vop_symlink_args *)v)->a_target; 1079 1080 KASSERT(vap->va_type == VLNK); 1081 1082 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1083 } 1084 1085 /* --------------------------------------------------------------------- */ 1086 1087 int 1088 tmpfs_readdir(void *v) 1089 { 1090 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1091 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1092 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1093 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1094 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1095 1096 int error; 1097 off_t startoff; 1098 off_t cnt; 1099 struct tmpfs_node *node; 1100 1101 KASSERT(VOP_ISLOCKED(vp)); 1102 1103 /* This operation only makes sense on directory nodes. */ 1104 if (vp->v_type != VDIR) { 1105 error = ENOTDIR; 1106 goto out; 1107 } 1108 1109 node = VP_TO_TMPFS_DIR(vp); 1110 1111 startoff = uio->uio_offset; 1112 1113 cnt = 0; 1114 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1115 error = tmpfs_dir_getdotdent(node, uio); 1116 if (error == -1) { 1117 error = 0; 1118 goto outok; 1119 } else if (error != 0) 1120 goto outok; 1121 cnt++; 1122 } 1123 1124 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1125 error = tmpfs_dir_getdotdotdent(node, uio); 1126 if (error == -1) { 1127 error = 0; 1128 goto outok; 1129 } else if (error != 0) 1130 goto outok; 1131 cnt++; 1132 } 1133 1134 error = tmpfs_dir_getdents(node, uio, &cnt); 1135 if (error == -1) 1136 error = 0; 1137 KASSERT(error >= 0); 1138 1139 outok: 1140 /* This label assumes that startoff has been 1141 * initialized. If the compiler didn't spit out warnings, we'd 1142 * simply make this one be 'out' and drop 'outok'. */ 1143 1144 if (eofflag != NULL) 1145 *eofflag = 1146 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1147 1148 /* Update NFS-related variables. */ 1149 if (error == 0 && cookies != NULL && ncookies != NULL) { 1150 off_t i; 1151 off_t off = startoff; 1152 struct tmpfs_dirent *de = NULL; 1153 1154 *ncookies = cnt; 1155 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1156 1157 for (i = 0; i < cnt; i++) { 1158 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1159 if (off == TMPFS_DIRCOOKIE_DOT) { 1160 off = TMPFS_DIRCOOKIE_DOTDOT; 1161 } else { 1162 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1163 de = TAILQ_FIRST(&node->tn_spec. 1164 tn_dir.tn_dir); 1165 } else if (de != NULL) { 1166 de = TAILQ_NEXT(de, td_entries); 1167 } else { 1168 de = tmpfs_dir_lookupbycookie(node, 1169 off); 1170 KASSERT(de != NULL); 1171 de = TAILQ_NEXT(de, td_entries); 1172 } 1173 if (de == NULL) { 1174 off = TMPFS_DIRCOOKIE_EOF; 1175 } else { 1176 off = tmpfs_dircookie(de); 1177 } 1178 } 1179 1180 (*cookies)[i] = off; 1181 } 1182 KASSERT(uio->uio_offset == off); 1183 } 1184 1185 out: 1186 KASSERT(VOP_ISLOCKED(vp)); 1187 1188 return error; 1189 } 1190 1191 /* --------------------------------------------------------------------- */ 1192 1193 int 1194 tmpfs_readlink(void *v) 1195 { 1196 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1197 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1198 1199 int error; 1200 struct tmpfs_node *node; 1201 1202 KASSERT(VOP_ISLOCKED(vp)); 1203 KASSERT(uio->uio_offset == 0); 1204 KASSERT(vp->v_type == VLNK); 1205 1206 node = VP_TO_TMPFS_NODE(vp); 1207 1208 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1209 MIN(node->tn_size, uio->uio_resid), uio); 1210 node->tn_status |= TMPFS_NODE_ACCESSED; 1211 1212 KASSERT(VOP_ISLOCKED(vp)); 1213 1214 return error; 1215 } 1216 1217 /* --------------------------------------------------------------------- */ 1218 1219 int 1220 tmpfs_inactive(void *v) 1221 { 1222 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1223 1224 struct tmpfs_node *node; 1225 1226 KASSERT(VOP_ISLOCKED(vp)); 1227 1228 node = VP_TO_TMPFS_NODE(vp); 1229 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1230 VOP_UNLOCK(vp, 0); 1231 1232 return 0; 1233 } 1234 1235 /* --------------------------------------------------------------------- */ 1236 1237 int 1238 tmpfs_reclaim(void *v) 1239 { 1240 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1241 1242 struct tmpfs_mount *tmp; 1243 struct tmpfs_node *node; 1244 1245 node = VP_TO_TMPFS_NODE(vp); 1246 tmp = VFS_TO_TMPFS(vp->v_mount); 1247 1248 cache_purge(vp); 1249 tmpfs_free_vp(vp); 1250 1251 /* If the node referenced by this vnode was deleted by the user, 1252 * we must free its associated data structures (now that the vnode 1253 * is being reclaimed). */ 1254 if (node->tn_links == 0) 1255 tmpfs_free_node(tmp, node); 1256 1257 KASSERT(vp->v_data == NULL); 1258 1259 return 0; 1260 } 1261 1262 /* --------------------------------------------------------------------- */ 1263 1264 int 1265 tmpfs_print(void *v) 1266 { 1267 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1268 1269 struct tmpfs_node *node; 1270 1271 node = VP_TO_TMPFS_NODE(vp); 1272 1273 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1274 node, node->tn_flags, node->tn_links); 1275 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1276 ", status 0x%x\n", 1277 node->tn_mode, node->tn_uid, node->tn_gid, 1278 (uintmax_t)node->tn_size, node->tn_status); 1279 if (vp->v_type == VFIFO) 1280 fifo_printinfo(vp); 1281 printf("\n"); 1282 1283 return 0; 1284 } 1285 1286 /* --------------------------------------------------------------------- */ 1287 1288 int 1289 tmpfs_pathconf(void *v) 1290 { 1291 int name = ((struct vop_pathconf_args *)v)->a_name; 1292 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1293 1294 int error; 1295 1296 error = 0; 1297 1298 switch (name) { 1299 case _PC_LINK_MAX: 1300 *retval = LINK_MAX; 1301 break; 1302 1303 case _PC_NAME_MAX: 1304 *retval = NAME_MAX; 1305 break; 1306 1307 case _PC_PATH_MAX: 1308 *retval = PATH_MAX; 1309 break; 1310 1311 case _PC_PIPE_BUF: 1312 *retval = PIPE_BUF; 1313 break; 1314 1315 case _PC_CHOWN_RESTRICTED: 1316 *retval = 1; 1317 break; 1318 1319 case _PC_NO_TRUNC: 1320 *retval = 1; 1321 break; 1322 1323 case _PC_SYNC_IO: 1324 *retval = 1; 1325 break; 1326 1327 case _PC_FILESIZEBITS: 1328 *retval = 0; /* XXX Don't know which value should I return. */ 1329 break; 1330 1331 default: 1332 error = EINVAL; 1333 } 1334 1335 return error; 1336 } 1337 1338 /* --------------------------------------------------------------------- */ 1339 1340 int 1341 tmpfs_advlock(void *v) 1342 { 1343 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1344 1345 struct tmpfs_node *node; 1346 1347 node = VP_TO_TMPFS_NODE(vp); 1348 1349 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1350 } 1351 1352 /* --------------------------------------------------------------------- */ 1353 1354 int 1355 tmpfs_getpages(void *v) 1356 { 1357 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1358 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1359 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1360 int *count = ((struct vop_getpages_args *)v)->a_count; 1361 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1362 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1363 int advice = ((struct vop_getpages_args *)v)->a_advice; 1364 int flags = ((struct vop_getpages_args *)v)->a_flags; 1365 1366 int error; 1367 int i; 1368 struct tmpfs_node *node; 1369 struct uvm_object *uobj; 1370 int npages = *count; 1371 1372 KASSERT(vp->v_type == VREG); 1373 KASSERT(mutex_owned(&vp->v_interlock)); 1374 1375 node = VP_TO_TMPFS_NODE(vp); 1376 uobj = node->tn_spec.tn_reg.tn_aobj; 1377 1378 /* We currently don't rely on PGO_PASTEOF. */ 1379 1380 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1381 if ((flags & PGO_LOCKED) == 0) 1382 mutex_exit(&vp->v_interlock); 1383 return EINVAL; 1384 } 1385 1386 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1387 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1388 } 1389 1390 if ((flags & PGO_LOCKED) != 0) 1391 return EBUSY; 1392 1393 if ((flags & PGO_NOTIMESTAMP) == 0) { 1394 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1395 node->tn_status |= TMPFS_NODE_ACCESSED; 1396 1397 if ((access_type & VM_PROT_WRITE) != 0) 1398 node->tn_status |= TMPFS_NODE_MODIFIED; 1399 } 1400 1401 mutex_exit(&vp->v_interlock); 1402 1403 /* 1404 * Make sure that the array on which we will store the 1405 * gotten pages is clean. Otherwise uao_get (pointed to by 1406 * the pgo_get below) gets confused and does not return the 1407 * appropriate pages. 1408 * 1409 * XXX This shall be revisited when kern/32166 is addressed 1410 * because the loop to clean m[i] will most likely be redundant 1411 * as well as the PGO_ALLPAGES flag. 1412 */ 1413 if (m != NULL) 1414 for (i = 0; i < npages; i++) 1415 m[i] = NULL; 1416 mutex_enter(&uobj->vmobjlock); 1417 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1418 access_type, advice, flags | PGO_ALLPAGES); 1419 #if defined(DEBUG) 1420 { 1421 /* Make sure that all the pages we return are valid. */ 1422 int dbgi; 1423 if (error == 0 && m != NULL) 1424 for (dbgi = 0; dbgi < npages; dbgi++) 1425 KASSERT(m[dbgi] != NULL); 1426 } 1427 #endif 1428 1429 return error; 1430 } 1431 1432 /* --------------------------------------------------------------------- */ 1433 1434 int 1435 tmpfs_putpages(void *v) 1436 { 1437 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1438 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1439 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1440 int flags = ((struct vop_putpages_args *)v)->a_flags; 1441 1442 int error; 1443 struct tmpfs_node *node; 1444 struct uvm_object *uobj; 1445 1446 KASSERT(mutex_owned(&vp->v_interlock)); 1447 1448 node = VP_TO_TMPFS_NODE(vp); 1449 1450 if (vp->v_type != VREG) { 1451 mutex_exit(&vp->v_interlock); 1452 return 0; 1453 } 1454 1455 uobj = node->tn_spec.tn_reg.tn_aobj; 1456 mutex_exit(&vp->v_interlock); 1457 1458 mutex_enter(&uobj->vmobjlock); 1459 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1460 1461 /* XXX mtime */ 1462 1463 return error; 1464 } 1465