1 /* $NetBSD: tmpfs_vnops.c,v 1.66 2010/01/08 11:35:09 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 1.66 2010/01/08 11:35:09 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 <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 kauth_action_t action = 0; 213 214 /* This is the file-system's decision. */ 215 if ((dnode->tn_mode & S_ISTXT) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 error = EPERM; 219 else 220 error = 0; 221 222 /* Only bother if we're not already failing it. */ 223 if (!error) { 224 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 225 } 226 227 if (cnp->cn_nameiop == DELETE) 228 action |= KAUTH_VNODE_DELETE; 229 else /* if (cnp->cn_nameiop == RENAME) */ 230 action |= KAUTH_VNODE_RENAME; 231 232 error = kauth_authorize_vnode(cnp->cn_cred, 233 action, *vpp, dvp, error); 234 if (error != 0) 235 goto out; 236 237 cnp->cn_flags |= SAVENAME; 238 } else 239 de = NULL; 240 241 /* Allocate a new vnode on the matching entry. */ 242 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 243 } 244 } 245 246 /* Store the result of this lookup in the cache. Avoid this if the 247 * request was for creation, as it does not improve timings on 248 * emprical tests. */ 249 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 250 (cnp->cn_flags & ISDOTDOT) == 0) 251 cache_enter(dvp, *vpp, cnp); 252 253 out: 254 /* If there were no errors, *vpp cannot be null and it must be 255 * locked. */ 256 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 257 258 /* dvp must always be locked. */ 259 KASSERT(VOP_ISLOCKED(dvp)); 260 261 return error; 262 } 263 264 /* --------------------------------------------------------------------- */ 265 266 int 267 tmpfs_create(void *v) 268 { 269 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 270 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 271 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 272 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 273 274 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 275 276 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 277 } 278 /* --------------------------------------------------------------------- */ 279 280 int 281 tmpfs_mknod(void *v) 282 { 283 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 284 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 285 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 286 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 287 288 if (vap->va_type != VBLK && vap->va_type != VCHR && 289 vap->va_type != VFIFO) { 290 vput(dvp); 291 return EINVAL; 292 } 293 294 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 295 } 296 297 /* --------------------------------------------------------------------- */ 298 299 int 300 tmpfs_open(void *v) 301 { 302 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 303 int mode = ((struct vop_open_args *)v)->a_mode; 304 305 int error; 306 struct tmpfs_node *node; 307 308 KASSERT(VOP_ISLOCKED(vp)); 309 310 node = VP_TO_TMPFS_NODE(vp); 311 312 /* The file is still active but all its names have been removed 313 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 314 * it is about to die. */ 315 if (node->tn_links < 1) { 316 error = ENOENT; 317 goto out; 318 } 319 320 /* If the file is marked append-only, deny write requests. */ 321 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 322 error = EPERM; 323 else 324 error = 0; 325 326 out: 327 KASSERT(VOP_ISLOCKED(vp)); 328 329 return error; 330 } 331 332 /* --------------------------------------------------------------------- */ 333 334 int 335 tmpfs_close(void *v) 336 { 337 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 338 339 struct tmpfs_node *node; 340 341 KASSERT(VOP_ISLOCKED(vp)); 342 343 node = VP_TO_TMPFS_NODE(vp); 344 345 if (node->tn_links > 0) { 346 /* Update node times. No need to do it if the node has 347 * been deleted, because it will vanish after we return. */ 348 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 349 } 350 351 return 0; 352 } 353 354 /* --------------------------------------------------------------------- */ 355 356 static int 357 tmpfs_check_possible(struct vnode *vp, struct tmpfs_node *node, mode_t mode) 358 { 359 int error = 0; 360 361 switch (vp->v_type) { 362 case VDIR: 363 /* FALLTHROUGH */ 364 case VLNK: 365 /* FALLTHROUGH */ 366 case VREG: 367 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 368 error = EROFS; 369 goto out; 370 } 371 break; 372 373 case VBLK: 374 /* FALLTHROUGH */ 375 case VCHR: 376 /* FALLTHROUGH */ 377 case VSOCK: 378 /* FALLTHROUGH */ 379 case VFIFO: 380 break; 381 382 default: 383 error = EINVAL; 384 goto out; 385 } 386 387 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 388 error = EPERM; 389 goto out; 390 } 391 392 out: 393 return error; 394 } 395 396 static int 397 tmpfs_check_permitted(struct vnode *vp, struct tmpfs_node *node, mode_t mode, 398 kauth_cred_t cred) 399 { 400 401 return genfs_can_access(vp->v_type, node->tn_mode, node->tn_uid, 402 node->tn_gid, mode, cred); 403 } 404 405 int 406 tmpfs_access(void *v) 407 { 408 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 409 int mode = ((struct vop_access_args *)v)->a_mode; 410 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 411 412 int error; 413 struct tmpfs_node *node; 414 415 KASSERT(VOP_ISLOCKED(vp)); 416 417 node = VP_TO_TMPFS_NODE(vp); 418 419 error = tmpfs_check_possible(vp, node, mode); 420 if (error) 421 goto out; 422 423 error = tmpfs_check_permitted(vp, node, mode, cred); 424 425 error = kauth_authorize_vnode(cred, kauth_mode_to_action(mode), vp, 426 NULL, error); 427 428 out: 429 KASSERT(VOP_ISLOCKED(vp)); 430 431 return error; 432 } 433 434 /* --------------------------------------------------------------------- */ 435 436 int 437 tmpfs_getattr(void *v) 438 { 439 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 440 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 441 442 struct tmpfs_node *node; 443 444 node = VP_TO_TMPFS_NODE(vp); 445 446 vattr_null(vap); 447 448 tmpfs_itimes(vp, NULL, NULL, NULL); 449 450 vap->va_type = vp->v_type; 451 vap->va_mode = node->tn_mode; 452 vap->va_nlink = node->tn_links; 453 vap->va_uid = node->tn_uid; 454 vap->va_gid = node->tn_gid; 455 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 456 vap->va_fileid = node->tn_id; 457 vap->va_size = node->tn_size; 458 vap->va_blocksize = PAGE_SIZE; 459 vap->va_atime = node->tn_atime; 460 vap->va_mtime = node->tn_mtime; 461 vap->va_ctime = node->tn_ctime; 462 vap->va_birthtime = node->tn_birthtime; 463 vap->va_gen = node->tn_gen; 464 vap->va_flags = node->tn_flags; 465 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 466 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 467 vap->va_bytes = round_page(node->tn_size); 468 vap->va_filerev = VNOVAL; 469 vap->va_vaflags = 0; 470 vap->va_spare = VNOVAL; /* XXX */ 471 472 return 0; 473 } 474 475 /* --------------------------------------------------------------------- */ 476 477 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 478 /* XXX Should this operation be atomic? I think it should, but code in 479 * XXX other places (e.g., ufs) doesn't seem to be... */ 480 int 481 tmpfs_setattr(void *v) 482 { 483 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 484 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 485 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 486 struct lwp *l = curlwp; 487 488 int error; 489 490 KASSERT(VOP_ISLOCKED(vp)); 491 492 error = 0; 493 494 /* Abort if any unsettable attribute is given. */ 495 if (vap->va_type != VNON || 496 vap->va_nlink != VNOVAL || 497 vap->va_fsid != VNOVAL || 498 vap->va_fileid != VNOVAL || 499 vap->va_blocksize != VNOVAL || 500 GOODTIME(&vap->va_ctime) || 501 vap->va_gen != VNOVAL || 502 vap->va_rdev != VNOVAL || 503 vap->va_bytes != VNOVAL) 504 error = EINVAL; 505 506 if (error == 0 && (vap->va_flags != VNOVAL)) 507 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 508 509 if (error == 0 && (vap->va_size != VNOVAL)) 510 error = tmpfs_chsize(vp, vap->va_size, cred, l); 511 512 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 513 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 514 515 if (error == 0 && (vap->va_mode != VNOVAL)) 516 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 517 518 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 519 || GOODTIME(&vap->va_birthtime))) 520 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 521 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 522 return 0; 523 524 /* Update the node times. We give preference to the error codes 525 * generated by this function rather than the ones that may arise 526 * from tmpfs_update. */ 527 tmpfs_update(vp, NULL, NULL, NULL, 0); 528 529 KASSERT(VOP_ISLOCKED(vp)); 530 531 return error; 532 } 533 534 /* --------------------------------------------------------------------- */ 535 536 int 537 tmpfs_read(void *v) 538 { 539 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 540 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 541 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 542 543 int error; 544 struct tmpfs_node *node; 545 struct uvm_object *uobj; 546 547 KASSERT(VOP_ISLOCKED(vp)); 548 549 node = VP_TO_TMPFS_NODE(vp); 550 551 if (vp->v_type != VREG) { 552 error = EISDIR; 553 goto out; 554 } 555 556 if (uio->uio_offset < 0) { 557 error = EINVAL; 558 goto out; 559 } 560 561 node->tn_status |= TMPFS_NODE_ACCESSED; 562 563 uobj = node->tn_spec.tn_reg.tn_aobj; 564 error = 0; 565 while (error == 0 && uio->uio_resid > 0) { 566 vsize_t len; 567 568 if (node->tn_size <= uio->uio_offset) 569 break; 570 571 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 572 if (len == 0) 573 break; 574 575 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 576 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 577 } 578 579 out: 580 KASSERT(VOP_ISLOCKED(vp)); 581 582 return error; 583 } 584 585 /* --------------------------------------------------------------------- */ 586 587 int 588 tmpfs_write(void *v) 589 { 590 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 591 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 592 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 593 594 bool extended; 595 int error; 596 off_t oldsize; 597 struct proc *p = curproc; 598 struct tmpfs_node *node; 599 struct uvm_object *uobj; 600 601 KASSERT(VOP_ISLOCKED(vp)); 602 603 node = VP_TO_TMPFS_NODE(vp); 604 oldsize = node->tn_size; 605 606 if (uio->uio_offset < 0 || vp->v_type != VREG) { 607 error = EINVAL; 608 goto out; 609 } 610 611 if (uio->uio_resid == 0) { 612 error = 0; 613 goto out; 614 } 615 616 if (((uio->uio_offset + uio->uio_resid) > 617 p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) { 618 mutex_enter(proc_lock); 619 psignal(p, SIGXFSZ); 620 mutex_exit(proc_lock); 621 error = EFBIG; 622 goto out; 623 } 624 625 if (ioflag & IO_APPEND) 626 uio->uio_offset = node->tn_size; 627 628 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 629 if (extended) { 630 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 631 if (error != 0) 632 goto out; 633 } 634 635 uobj = node->tn_spec.tn_reg.tn_aobj; 636 error = 0; 637 while (error == 0 && uio->uio_resid > 0) { 638 vsize_t len; 639 640 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 641 if (len == 0) 642 break; 643 644 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 645 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 646 } 647 648 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 649 (extended ? TMPFS_NODE_CHANGED : 0); 650 651 if (error != 0) 652 (void)tmpfs_reg_resize(vp, oldsize); 653 654 VN_KNOTE(vp, NOTE_WRITE); 655 656 out: 657 KASSERT(VOP_ISLOCKED(vp)); 658 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 659 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 660 661 return error; 662 } 663 664 /* --------------------------------------------------------------------- */ 665 666 int 667 tmpfs_fsync(void *v) 668 { 669 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 670 671 KASSERT(VOP_ISLOCKED(vp)); 672 673 tmpfs_update(vp, NULL, NULL, NULL, 0); 674 675 return 0; 676 } 677 678 /* --------------------------------------------------------------------- */ 679 680 int 681 tmpfs_remove(void *v) 682 { 683 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 684 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 685 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 686 687 int error; 688 struct tmpfs_dirent *de; 689 struct tmpfs_mount *tmp; 690 struct tmpfs_node *dnode; 691 struct tmpfs_node *node; 692 693 KASSERT(VOP_ISLOCKED(dvp)); 694 KASSERT(VOP_ISLOCKED(vp)); 695 696 if (vp->v_type == VDIR) { 697 error = EPERM; 698 goto out; 699 } 700 701 dnode = VP_TO_TMPFS_DIR(dvp); 702 node = VP_TO_TMPFS_NODE(vp); 703 tmp = VFS_TO_TMPFS(vp->v_mount); 704 de = tmpfs_dir_lookup(dnode, cnp); 705 KASSERT(de); 706 KASSERT(de->td_node == node); 707 708 /* Files marked as immutable or append-only cannot be deleted. */ 709 if (node->tn_flags & (IMMUTABLE | APPEND)) { 710 error = EPERM; 711 goto out; 712 } 713 714 /* Remove the entry from the directory; as it is a file, we do not 715 * have to change the number of hard links of the directory. */ 716 tmpfs_dir_detach(dvp, de); 717 718 /* Free the directory entry we just deleted. Note that the node 719 * referred by it will not be removed until the vnode is really 720 * reclaimed. */ 721 tmpfs_free_dirent(tmp, de, true); 722 723 error = 0; 724 725 out: 726 vput(vp); 727 if (dvp == vp) 728 vrele(dvp); 729 else 730 vput(dvp); 731 if (cnp->cn_flags & HASBUF) { 732 PNBUF_PUT(cnp->cn_pnbuf); 733 cnp->cn_flags &= ~HASBUF; 734 } 735 736 return error; 737 } 738 739 /* --------------------------------------------------------------------- */ 740 741 int 742 tmpfs_link(void *v) 743 { 744 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 745 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 746 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 747 748 int error; 749 struct tmpfs_dirent *de; 750 struct tmpfs_node *dnode; 751 struct tmpfs_node *node; 752 753 KASSERT(VOP_ISLOCKED(dvp)); 754 KASSERT(cnp->cn_flags & HASBUF); 755 KASSERT(dvp != vp); /* XXX When can this be false? */ 756 757 dnode = VP_TO_TMPFS_DIR(dvp); 758 node = VP_TO_TMPFS_NODE(vp); 759 760 /* Lock vp because we will need to run tmpfs_update over it, which 761 * needs the vnode to be locked. */ 762 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 763 764 /* XXX: Why aren't the following two tests done by the caller? */ 765 766 /* Hard links of directories are forbidden. */ 767 if (vp->v_type == VDIR) { 768 error = EPERM; 769 goto out; 770 } 771 772 /* Cannot create cross-device links. */ 773 if (dvp->v_mount != vp->v_mount) { 774 error = EXDEV; 775 goto out; 776 } 777 778 /* Ensure that we do not overflow the maximum number of links imposed 779 * by the system. */ 780 KASSERT(node->tn_links <= LINK_MAX); 781 if (node->tn_links == LINK_MAX) { 782 error = EMLINK; 783 goto out; 784 } 785 786 /* We cannot create links of files marked immutable or append-only. */ 787 if (node->tn_flags & (IMMUTABLE | APPEND)) { 788 error = EPERM; 789 goto out; 790 } 791 792 /* Allocate a new directory entry to represent the node. */ 793 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 794 cnp->cn_nameptr, cnp->cn_namelen, &de); 795 if (error != 0) 796 goto out; 797 798 /* Insert the new directory entry into the appropriate directory. */ 799 tmpfs_dir_attach(dvp, de); 800 801 /* vp link count has changed, so update node times. */ 802 node->tn_status |= TMPFS_NODE_CHANGED; 803 tmpfs_update(vp, NULL, NULL, NULL, 0); 804 805 error = 0; 806 807 out: 808 VOP_UNLOCK(vp, 0); 809 PNBUF_PUT(cnp->cn_pnbuf); 810 vput(dvp); 811 812 return error; 813 } 814 815 /* 816 * tmpfs_rename: rename routine. 817 * 818 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 819 * and tvp (to-leaf), if exists (NULL if not). 820 * 821 * => Caller holds a reference on fdvp and fvp, they are unlocked. 822 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 823 * 824 * => Both tdvp and tvp are referenced and locked. It is our responsibility 825 * to release the references and unlock them (or destroy). 826 */ 827 int 828 tmpfs_rename(void *v) 829 { 830 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 831 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 832 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 833 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 834 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 835 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 836 837 char *newname; 838 int error; 839 struct tmpfs_dirent *de, *de2; 840 struct tmpfs_mount *tmp; 841 struct tmpfs_node *fdnode; 842 struct tmpfs_node *fnode; 843 struct tmpfs_node *tnode; 844 struct tmpfs_node *tdnode; 845 size_t namelen; 846 847 KASSERT(VOP_ISLOCKED(tdvp)); 848 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 849 KASSERT(fcnp->cn_flags & HASBUF); 850 KASSERT(tcnp->cn_flags & HASBUF); 851 852 newname = NULL; 853 namelen = 0; 854 tmp = NULL; 855 856 /* Disallow cross-device renames. */ 857 if (fvp->v_mount != tdvp->v_mount || 858 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 859 error = EXDEV; 860 goto out_unlocked; 861 } 862 863 fnode = VP_TO_TMPFS_NODE(fvp); 864 fdnode = VP_TO_TMPFS_DIR(fdvp); 865 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 866 tdnode = VP_TO_TMPFS_DIR(tdvp); 867 tmp = VFS_TO_TMPFS(tdvp->v_mount); 868 869 if (fdvp == tvp) { 870 error = 0; 871 goto out_unlocked; 872 } 873 874 /* If we need to move the directory between entries, lock the 875 * source so that we can safely operate on it. */ 876 877 /* XXX: this is a potential locking order violation! */ 878 if (fdnode != tdnode) { 879 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 880 } 881 882 /* 883 * If the node we were renaming has scarpered, just give up. 884 */ 885 de = tmpfs_dir_lookup(fdnode, fcnp); 886 if (de == NULL || de->td_node != fnode) { 887 error = ENOENT; 888 goto out; 889 } 890 891 /* If source and target is the same vnode, remove the source link. */ 892 if (fvp == tvp) { 893 /* 894 * Detach and free the directory entry. Drops the link 895 * count on the node. 896 */ 897 tmpfs_dir_detach(fdvp, de); 898 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 899 VN_KNOTE(fdvp, NOTE_WRITE); 900 goto out_ok; 901 } 902 903 /* If replacing an existing entry, ensure we can do the operation. */ 904 if (tvp != NULL) { 905 KASSERT(tnode != NULL); 906 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 907 if (tnode->tn_size > 0) { 908 error = ENOTEMPTY; 909 goto out; 910 } 911 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 912 error = ENOTDIR; 913 goto out; 914 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 915 error = EISDIR; 916 goto out; 917 } else { 918 KASSERT(fnode->tn_type != VDIR && 919 tnode->tn_type != VDIR); 920 } 921 } 922 923 /* Ensure that we have enough memory to hold the new name, if it 924 * has to be changed. */ 925 namelen = tcnp->cn_namelen; 926 if (fcnp->cn_namelen != tcnp->cn_namelen || 927 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 928 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 929 if (newname == NULL) { 930 error = ENOSPC; 931 goto out; 932 } 933 } 934 935 /* If the node is being moved to another directory, we have to do 936 * the move. */ 937 if (fdnode != tdnode) { 938 /* In case we are moving a directory, we have to adjust its 939 * parent to point to the new parent. */ 940 if (de->td_node->tn_type == VDIR) { 941 struct tmpfs_node *n; 942 943 /* Ensure the target directory is not a child of the 944 * directory being moved. Otherwise, we'd end up 945 * with stale nodes. */ 946 n = tdnode; 947 while (n != n->tn_spec.tn_dir.tn_parent) { 948 if (n == fnode) { 949 error = EINVAL; 950 goto out; 951 } 952 n = n->tn_spec.tn_dir.tn_parent; 953 } 954 955 /* Adjust the parent pointer. */ 956 TMPFS_VALIDATE_DIR(fnode); 957 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 958 959 /* As a result of changing the target of the '..' 960 * entry, the link count of the source and target 961 * directories has to be adjusted. */ 962 fdnode->tn_links--; 963 tdnode->tn_links++; 964 } 965 966 /* Do the move: just remove the entry from the source directory 967 * and insert it into the target one. */ 968 tmpfs_dir_detach(fdvp, de); 969 tmpfs_dir_attach(tdvp, de); 970 971 /* Notify listeners of fdvp about the change in the directory. 972 * We can do it at this point because we aren't touching fdvp 973 * any more below. */ 974 VN_KNOTE(fdvp, NOTE_WRITE); 975 } 976 977 /* If we are overwriting an entry, we have to remove the old one 978 * from the target directory. */ 979 if (tvp != NULL) { 980 KASSERT(tnode != NULL); 981 982 /* Remove the old entry from the target directory. 983 * Note! This relies on tmpfs_dir_attach() putting the new 984 * node on the end of the target's node list. */ 985 de2 = tmpfs_dir_lookup(tdnode, tcnp); 986 KASSERT(de2 != NULL); 987 KASSERT(de2->td_node == tnode); 988 tmpfs_dir_detach(tdvp, de2); 989 990 /* Free the directory entry we just deleted. Note that the 991 * node referred by it will not be removed until the vnode is 992 * really reclaimed. */ 993 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 994 } 995 996 /* If the name has changed, we need to make it effective by changing 997 * it in the directory entry. */ 998 if (newname != NULL) { 999 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 1000 KASSERT(tcnp->cn_namelen < 0xffff); 1001 1002 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 1003 de->td_namelen); 1004 de->td_namelen = (uint16_t)namelen; 1005 memcpy(newname, tcnp->cn_nameptr, namelen); 1006 de->td_name = newname; 1007 newname = NULL; 1008 1009 fnode->tn_status |= TMPFS_NODE_CHANGED; 1010 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1011 } 1012 out_ok: 1013 /* Notify listeners of tdvp about the change in the directory (either 1014 * because a new entry was added or because one was removed) and 1015 * listeners of fvp about the rename. */ 1016 VN_KNOTE(tdvp, NOTE_WRITE); 1017 VN_KNOTE(fvp, NOTE_RENAME); 1018 1019 error = 0; 1020 1021 out: 1022 if (fdnode != tdnode) 1023 VOP_UNLOCK(fdvp, 0); 1024 1025 out_unlocked: 1026 /* Release target nodes. */ 1027 if (tdvp == tvp) 1028 vrele(tdvp); 1029 else 1030 vput(tdvp); 1031 if (tvp != NULL) 1032 vput(tvp); 1033 1034 /* Release source nodes. */ 1035 vrele(fdvp); 1036 vrele(fvp); 1037 1038 if (newname != NULL) 1039 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 1040 1041 return error; 1042 } 1043 1044 /* --------------------------------------------------------------------- */ 1045 1046 int 1047 tmpfs_mkdir(void *v) 1048 { 1049 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1050 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1051 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1052 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1053 1054 KASSERT(vap->va_type == VDIR); 1055 1056 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1057 } 1058 1059 /* --------------------------------------------------------------------- */ 1060 1061 int 1062 tmpfs_rmdir(void *v) 1063 { 1064 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1065 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1066 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1067 1068 int error; 1069 struct tmpfs_dirent *de; 1070 struct tmpfs_mount *tmp; 1071 struct tmpfs_node *dnode; 1072 struct tmpfs_node *node; 1073 1074 KASSERT(VOP_ISLOCKED(dvp)); 1075 KASSERT(VOP_ISLOCKED(vp)); 1076 1077 tmp = VFS_TO_TMPFS(dvp->v_mount); 1078 dnode = VP_TO_TMPFS_DIR(dvp); 1079 node = VP_TO_TMPFS_DIR(vp); 1080 error = 0; 1081 1082 /* Directories with more than two entries ('.' and '..') cannot be 1083 * removed. */ 1084 if (node->tn_size > 0) { 1085 error = ENOTEMPTY; 1086 goto out; 1087 } 1088 1089 /* This invariant holds only if we are not trying to remove "..". 1090 * We checked for that above so this is safe now. */ 1091 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1092 1093 /* Get the directory entry associated with node (vp). */ 1094 de = tmpfs_dir_lookup(dnode, cnp); 1095 KASSERT(de); 1096 KASSERT(de->td_node == node); 1097 1098 /* Check flags to see if we are allowed to remove the directory. */ 1099 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1100 error = EPERM; 1101 goto out; 1102 } 1103 1104 /* Detach the directory entry from the directory (dnode). */ 1105 tmpfs_dir_detach(dvp, de); 1106 1107 node->tn_links--; 1108 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1109 TMPFS_NODE_MODIFIED; 1110 node->tn_spec.tn_dir.tn_parent->tn_links--; 1111 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1112 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1113 1114 /* Release the parent. */ 1115 cache_purge(dvp); /* XXX Is this needed? */ 1116 1117 /* Free the directory entry we just deleted. Note that the node 1118 * referred by it will not be removed until the vnode is really 1119 * reclaimed. */ 1120 tmpfs_free_dirent(tmp, de, true); 1121 1122 KASSERT(node->tn_links == 0); 1123 out: 1124 /* Release the nodes. */ 1125 vput(dvp); 1126 vput(vp); 1127 PNBUF_PUT(cnp->cn_pnbuf); 1128 1129 return error; 1130 } 1131 1132 /* --------------------------------------------------------------------- */ 1133 1134 int 1135 tmpfs_symlink(void *v) 1136 { 1137 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1138 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1139 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1140 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1141 char *target = ((struct vop_symlink_args *)v)->a_target; 1142 1143 KASSERT(vap->va_type == VLNK); 1144 1145 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1146 } 1147 1148 /* --------------------------------------------------------------------- */ 1149 1150 int 1151 tmpfs_readdir(void *v) 1152 { 1153 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1154 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1155 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1156 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1157 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1158 1159 int error; 1160 off_t startoff; 1161 off_t cnt; 1162 struct tmpfs_node *node; 1163 1164 KASSERT(VOP_ISLOCKED(vp)); 1165 1166 /* This operation only makes sense on directory nodes. */ 1167 if (vp->v_type != VDIR) { 1168 error = ENOTDIR; 1169 goto out; 1170 } 1171 1172 node = VP_TO_TMPFS_DIR(vp); 1173 1174 startoff = uio->uio_offset; 1175 1176 cnt = 0; 1177 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1178 error = tmpfs_dir_getdotdent(node, uio); 1179 if (error == -1) { 1180 error = 0; 1181 goto outok; 1182 } else if (error != 0) 1183 goto outok; 1184 cnt++; 1185 } 1186 1187 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1188 error = tmpfs_dir_getdotdotdent(node, uio); 1189 if (error == -1) { 1190 error = 0; 1191 goto outok; 1192 } else if (error != 0) 1193 goto outok; 1194 cnt++; 1195 } 1196 1197 error = tmpfs_dir_getdents(node, uio, &cnt); 1198 if (error == -1) 1199 error = 0; 1200 KASSERT(error >= 0); 1201 1202 outok: 1203 /* This label assumes that startoff has been 1204 * initialized. If the compiler didn't spit out warnings, we'd 1205 * simply make this one be 'out' and drop 'outok'. */ 1206 1207 if (eofflag != NULL) 1208 *eofflag = 1209 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1210 1211 /* Update NFS-related variables. */ 1212 if (error == 0 && cookies != NULL && ncookies != NULL) { 1213 off_t i; 1214 off_t off = startoff; 1215 struct tmpfs_dirent *de = NULL; 1216 1217 *ncookies = cnt; 1218 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1219 1220 for (i = 0; i < cnt; i++) { 1221 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1222 if (off == TMPFS_DIRCOOKIE_DOT) { 1223 off = TMPFS_DIRCOOKIE_DOTDOT; 1224 } else { 1225 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1226 de = TAILQ_FIRST(&node->tn_spec. 1227 tn_dir.tn_dir); 1228 } else if (de != NULL) { 1229 de = TAILQ_NEXT(de, td_entries); 1230 } else { 1231 de = tmpfs_dir_lookupbycookie(node, 1232 off); 1233 KASSERT(de != NULL); 1234 de = TAILQ_NEXT(de, td_entries); 1235 } 1236 if (de == NULL) { 1237 off = TMPFS_DIRCOOKIE_EOF; 1238 } else { 1239 off = tmpfs_dircookie(de); 1240 } 1241 } 1242 1243 (*cookies)[i] = off; 1244 } 1245 KASSERT(uio->uio_offset == off); 1246 } 1247 1248 out: 1249 KASSERT(VOP_ISLOCKED(vp)); 1250 1251 return error; 1252 } 1253 1254 /* --------------------------------------------------------------------- */ 1255 1256 int 1257 tmpfs_readlink(void *v) 1258 { 1259 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1260 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1261 1262 int error; 1263 struct tmpfs_node *node; 1264 1265 KASSERT(VOP_ISLOCKED(vp)); 1266 KASSERT(uio->uio_offset == 0); 1267 KASSERT(vp->v_type == VLNK); 1268 1269 node = VP_TO_TMPFS_NODE(vp); 1270 1271 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1272 MIN(node->tn_size, uio->uio_resid), uio); 1273 node->tn_status |= TMPFS_NODE_ACCESSED; 1274 1275 KASSERT(VOP_ISLOCKED(vp)); 1276 1277 return error; 1278 } 1279 1280 /* --------------------------------------------------------------------- */ 1281 1282 int 1283 tmpfs_inactive(void *v) 1284 { 1285 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1286 1287 struct tmpfs_node *node; 1288 1289 KASSERT(VOP_ISLOCKED(vp)); 1290 1291 node = VP_TO_TMPFS_NODE(vp); 1292 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1293 VOP_UNLOCK(vp, 0); 1294 1295 return 0; 1296 } 1297 1298 /* --------------------------------------------------------------------- */ 1299 1300 int 1301 tmpfs_reclaim(void *v) 1302 { 1303 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1304 1305 struct tmpfs_mount *tmp; 1306 struct tmpfs_node *node; 1307 1308 node = VP_TO_TMPFS_NODE(vp); 1309 tmp = VFS_TO_TMPFS(vp->v_mount); 1310 1311 cache_purge(vp); 1312 tmpfs_free_vp(vp); 1313 1314 /* If the node referenced by this vnode was deleted by the user, 1315 * we must free its associated data structures (now that the vnode 1316 * is being reclaimed). */ 1317 if (node->tn_links == 0) 1318 tmpfs_free_node(tmp, node); 1319 1320 KASSERT(vp->v_data == NULL); 1321 1322 return 0; 1323 } 1324 1325 /* --------------------------------------------------------------------- */ 1326 1327 int 1328 tmpfs_print(void *v) 1329 { 1330 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1331 1332 struct tmpfs_node *node; 1333 1334 node = VP_TO_TMPFS_NODE(vp); 1335 1336 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1337 node, node->tn_flags, node->tn_links); 1338 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1339 ", status 0x%x\n", 1340 node->tn_mode, node->tn_uid, node->tn_gid, 1341 (uintmax_t)node->tn_size, node->tn_status); 1342 if (vp->v_type == VFIFO) 1343 fifo_printinfo(vp); 1344 printf("\n"); 1345 1346 return 0; 1347 } 1348 1349 /* --------------------------------------------------------------------- */ 1350 1351 int 1352 tmpfs_pathconf(void *v) 1353 { 1354 int name = ((struct vop_pathconf_args *)v)->a_name; 1355 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1356 1357 int error; 1358 1359 error = 0; 1360 1361 switch (name) { 1362 case _PC_LINK_MAX: 1363 *retval = LINK_MAX; 1364 break; 1365 1366 case _PC_NAME_MAX: 1367 *retval = NAME_MAX; 1368 break; 1369 1370 case _PC_PATH_MAX: 1371 *retval = PATH_MAX; 1372 break; 1373 1374 case _PC_PIPE_BUF: 1375 *retval = PIPE_BUF; 1376 break; 1377 1378 case _PC_CHOWN_RESTRICTED: 1379 *retval = 1; 1380 break; 1381 1382 case _PC_NO_TRUNC: 1383 *retval = 1; 1384 break; 1385 1386 case _PC_SYNC_IO: 1387 *retval = 1; 1388 break; 1389 1390 case _PC_FILESIZEBITS: 1391 *retval = 0; /* XXX Don't know which value should I return. */ 1392 break; 1393 1394 default: 1395 error = EINVAL; 1396 } 1397 1398 return error; 1399 } 1400 1401 /* --------------------------------------------------------------------- */ 1402 1403 int 1404 tmpfs_advlock(void *v) 1405 { 1406 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1407 1408 struct tmpfs_node *node; 1409 1410 node = VP_TO_TMPFS_NODE(vp); 1411 1412 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1413 } 1414 1415 /* --------------------------------------------------------------------- */ 1416 1417 int 1418 tmpfs_getpages(void *v) 1419 { 1420 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1421 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1422 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1423 int *count = ((struct vop_getpages_args *)v)->a_count; 1424 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1425 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1426 int advice = ((struct vop_getpages_args *)v)->a_advice; 1427 int flags = ((struct vop_getpages_args *)v)->a_flags; 1428 1429 int error; 1430 int i; 1431 struct tmpfs_node *node; 1432 struct uvm_object *uobj; 1433 int npages = *count; 1434 1435 KASSERT(vp->v_type == VREG); 1436 KASSERT(mutex_owned(&vp->v_interlock)); 1437 1438 node = VP_TO_TMPFS_NODE(vp); 1439 uobj = node->tn_spec.tn_reg.tn_aobj; 1440 1441 /* We currently don't rely on PGO_PASTEOF. */ 1442 1443 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1444 if ((flags & PGO_LOCKED) == 0) 1445 mutex_exit(&vp->v_interlock); 1446 return EINVAL; 1447 } 1448 1449 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1450 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1451 } 1452 1453 if ((flags & PGO_LOCKED) != 0) 1454 return EBUSY; 1455 1456 if ((flags & PGO_NOTIMESTAMP) == 0) { 1457 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1458 node->tn_status |= TMPFS_NODE_ACCESSED; 1459 1460 if ((access_type & VM_PROT_WRITE) != 0) 1461 node->tn_status |= TMPFS_NODE_MODIFIED; 1462 } 1463 1464 mutex_exit(&vp->v_interlock); 1465 1466 /* 1467 * Make sure that the array on which we will store the 1468 * gotten pages is clean. Otherwise uao_get (pointed to by 1469 * the pgo_get below) gets confused and does not return the 1470 * appropriate pages. 1471 * 1472 * XXX This shall be revisited when kern/32166 is addressed 1473 * because the loop to clean m[i] will most likely be redundant 1474 * as well as the PGO_ALLPAGES flag. 1475 */ 1476 if (m != NULL) 1477 for (i = 0; i < npages; i++) 1478 m[i] = NULL; 1479 mutex_enter(&uobj->vmobjlock); 1480 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1481 access_type, advice, flags | PGO_ALLPAGES); 1482 #if defined(DEBUG) 1483 { 1484 /* Make sure that all the pages we return are valid. */ 1485 int dbgi; 1486 if (error == 0 && m != NULL) 1487 for (dbgi = 0; dbgi < npages; dbgi++) 1488 KASSERT(m[dbgi] != NULL); 1489 } 1490 #endif 1491 1492 return error; 1493 } 1494 1495 /* --------------------------------------------------------------------- */ 1496 1497 int 1498 tmpfs_putpages(void *v) 1499 { 1500 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1501 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1502 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1503 int flags = ((struct vop_putpages_args *)v)->a_flags; 1504 1505 int error; 1506 struct tmpfs_node *node; 1507 struct uvm_object *uobj; 1508 1509 KASSERT(mutex_owned(&vp->v_interlock)); 1510 1511 node = VP_TO_TMPFS_NODE(vp); 1512 1513 if (vp->v_type != VREG) { 1514 mutex_exit(&vp->v_interlock); 1515 return 0; 1516 } 1517 1518 uobj = node->tn_spec.tn_reg.tn_aobj; 1519 mutex_exit(&vp->v_interlock); 1520 1521 mutex_enter(&uobj->vmobjlock); 1522 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1523 1524 /* XXX mtime */ 1525 1526 return error; 1527 } 1528