tmpfs_vnops.c revision 1.66.4.2
1 /* $NetBSD: tmpfs_vnops.c,v 1.66.4.2 2010/05/30 05:17:56 rmind 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 1.66.4.2 2010/05/30 05:17:56 rmind 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 tmpfs_node *node; 598 struct uvm_object *uobj; 599 600 KASSERT(VOP_ISLOCKED(vp)); 601 602 node = VP_TO_TMPFS_NODE(vp); 603 oldsize = node->tn_size; 604 605 if (uio->uio_offset < 0 || vp->v_type != VREG) { 606 error = EINVAL; 607 goto out; 608 } 609 610 if (uio->uio_resid == 0) { 611 error = 0; 612 goto out; 613 } 614 615 if (ioflag & IO_APPEND) 616 uio->uio_offset = node->tn_size; 617 618 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 619 if (extended) { 620 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 621 if (error != 0) 622 goto out; 623 } 624 625 uobj = node->tn_spec.tn_reg.tn_aobj; 626 error = 0; 627 while (error == 0 && uio->uio_resid > 0) { 628 vsize_t len; 629 630 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 631 if (len == 0) 632 break; 633 634 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 635 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 636 } 637 638 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 639 (extended ? TMPFS_NODE_CHANGED : 0); 640 641 if (error != 0) 642 (void)tmpfs_reg_resize(vp, oldsize); 643 644 VN_KNOTE(vp, NOTE_WRITE); 645 646 out: 647 KASSERT(VOP_ISLOCKED(vp)); 648 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 649 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 650 651 return error; 652 } 653 654 /* --------------------------------------------------------------------- */ 655 656 int 657 tmpfs_fsync(void *v) 658 { 659 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 660 661 KASSERT(VOP_ISLOCKED(vp)); 662 663 tmpfs_update(vp, NULL, NULL, NULL, 0); 664 665 return 0; 666 } 667 668 /* --------------------------------------------------------------------- */ 669 670 int 671 tmpfs_remove(void *v) 672 { 673 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 674 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 675 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 676 677 int error; 678 struct tmpfs_dirent *de; 679 struct tmpfs_mount *tmp; 680 struct tmpfs_node *dnode; 681 struct tmpfs_node *node; 682 683 KASSERT(VOP_ISLOCKED(dvp)); 684 KASSERT(VOP_ISLOCKED(vp)); 685 686 if (vp->v_type == VDIR) { 687 error = EPERM; 688 goto out; 689 } 690 691 dnode = VP_TO_TMPFS_DIR(dvp); 692 node = VP_TO_TMPFS_NODE(vp); 693 tmp = VFS_TO_TMPFS(vp->v_mount); 694 de = tmpfs_dir_lookup(dnode, cnp); 695 KASSERT(de); 696 KASSERT(de->td_node == node); 697 698 /* Files marked as immutable or append-only cannot be deleted. */ 699 if (node->tn_flags & (IMMUTABLE | APPEND)) { 700 error = EPERM; 701 goto out; 702 } 703 704 /* Remove the entry from the directory; as it is a file, we do not 705 * have to change the number of hard links of the directory. */ 706 tmpfs_dir_detach(dvp, de); 707 708 /* Free the directory entry we just deleted. Note that the node 709 * referred by it will not be removed until the vnode is really 710 * reclaimed. */ 711 tmpfs_free_dirent(tmp, de, true); 712 713 error = 0; 714 715 out: 716 vput(vp); 717 if (dvp == vp) 718 vrele(dvp); 719 else 720 vput(dvp); 721 if (cnp->cn_flags & HASBUF) { 722 PNBUF_PUT(cnp->cn_pnbuf); 723 cnp->cn_flags &= ~HASBUF; 724 } 725 726 return error; 727 } 728 729 /* --------------------------------------------------------------------- */ 730 731 int 732 tmpfs_link(void *v) 733 { 734 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 735 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 736 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 737 738 int error; 739 struct tmpfs_dirent *de; 740 struct tmpfs_node *dnode; 741 struct tmpfs_node *node; 742 743 KASSERT(VOP_ISLOCKED(dvp)); 744 KASSERT(cnp->cn_flags & HASBUF); 745 KASSERT(dvp != vp); /* XXX When can this be false? */ 746 747 dnode = VP_TO_TMPFS_DIR(dvp); 748 node = VP_TO_TMPFS_NODE(vp); 749 750 /* Lock vp because we will need to run tmpfs_update over it, which 751 * needs the vnode to be locked. */ 752 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 753 754 /* XXX: Why aren't the following two tests done by the caller? */ 755 756 /* Hard links of directories are forbidden. */ 757 if (vp->v_type == VDIR) { 758 error = EPERM; 759 goto out; 760 } 761 762 /* Cannot create cross-device links. */ 763 if (dvp->v_mount != vp->v_mount) { 764 error = EXDEV; 765 goto out; 766 } 767 768 /* Ensure that we do not overflow the maximum number of links imposed 769 * by the system. */ 770 KASSERT(node->tn_links <= LINK_MAX); 771 if (node->tn_links == LINK_MAX) { 772 error = EMLINK; 773 goto out; 774 } 775 776 /* We cannot create links of files marked immutable or append-only. */ 777 if (node->tn_flags & (IMMUTABLE | APPEND)) { 778 error = EPERM; 779 goto out; 780 } 781 782 /* Allocate a new directory entry to represent the node. */ 783 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 784 cnp->cn_nameptr, cnp->cn_namelen, &de); 785 if (error != 0) 786 goto out; 787 788 /* Insert the new directory entry into the appropriate directory. */ 789 tmpfs_dir_attach(dvp, de); 790 791 /* vp link count has changed, so update node times. */ 792 node->tn_status |= TMPFS_NODE_CHANGED; 793 tmpfs_update(vp, NULL, NULL, NULL, 0); 794 795 error = 0; 796 797 out: 798 VOP_UNLOCK(vp, 0); 799 PNBUF_PUT(cnp->cn_pnbuf); 800 vput(dvp); 801 802 return error; 803 } 804 805 /* 806 * tmpfs_rename: rename routine. 807 * 808 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 809 * and tvp (to-leaf), if exists (NULL if not). 810 * 811 * => Caller holds a reference on fdvp and fvp, they are unlocked. 812 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 813 * 814 * => Both tdvp and tvp are referenced and locked. It is our responsibility 815 * to release the references and unlock them (or destroy). 816 */ 817 int 818 tmpfs_rename(void *v) 819 { 820 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 821 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 822 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 823 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 824 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 825 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 826 827 char *newname; 828 int error; 829 struct tmpfs_dirent *de, *de2; 830 struct tmpfs_mount *tmp; 831 struct tmpfs_node *fdnode; 832 struct tmpfs_node *fnode; 833 struct tmpfs_node *tnode; 834 struct tmpfs_node *tdnode; 835 size_t namelen; 836 837 KASSERT(VOP_ISLOCKED(tdvp)); 838 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 839 KASSERT(fcnp->cn_flags & HASBUF); 840 KASSERT(tcnp->cn_flags & HASBUF); 841 842 newname = NULL; 843 namelen = 0; 844 tmp = NULL; 845 846 /* Disallow cross-device renames. */ 847 if (fvp->v_mount != tdvp->v_mount || 848 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 849 error = EXDEV; 850 goto out_unlocked; 851 } 852 853 fnode = VP_TO_TMPFS_NODE(fvp); 854 fdnode = VP_TO_TMPFS_DIR(fdvp); 855 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 856 tdnode = VP_TO_TMPFS_DIR(tdvp); 857 tmp = VFS_TO_TMPFS(tdvp->v_mount); 858 859 if (fdvp == tvp) { 860 error = 0; 861 goto out_unlocked; 862 } 863 864 /* If we need to move the directory between entries, lock the 865 * source so that we can safely operate on it. */ 866 867 /* XXX: this is a potential locking order violation! */ 868 if (fdnode != tdnode) { 869 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 870 } 871 872 /* 873 * If the node we were renaming has scarpered, just give up. 874 */ 875 de = tmpfs_dir_lookup(fdnode, fcnp); 876 if (de == NULL || de->td_node != fnode) { 877 error = ENOENT; 878 goto out; 879 } 880 881 /* If source and target is the same vnode, remove the source link. */ 882 if (fvp == tvp) { 883 /* 884 * Detach and free the directory entry. Drops the link 885 * count on the node. 886 */ 887 tmpfs_dir_detach(fdvp, de); 888 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 889 VN_KNOTE(fdvp, NOTE_WRITE); 890 goto out_ok; 891 } 892 893 /* If replacing an existing entry, ensure we can do the operation. */ 894 if (tvp != NULL) { 895 KASSERT(tnode != NULL); 896 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 897 if (tnode->tn_size > 0) { 898 error = ENOTEMPTY; 899 goto out; 900 } 901 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 902 error = ENOTDIR; 903 goto out; 904 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 905 error = EISDIR; 906 goto out; 907 } else { 908 KASSERT(fnode->tn_type != VDIR && 909 tnode->tn_type != VDIR); 910 } 911 } 912 913 /* Ensure that we have enough memory to hold the new name, if it 914 * has to be changed. */ 915 namelen = tcnp->cn_namelen; 916 if (fcnp->cn_namelen != tcnp->cn_namelen || 917 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 918 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 919 if (newname == NULL) { 920 error = ENOSPC; 921 goto out; 922 } 923 } 924 925 /* If the node is being moved to another directory, we have to do 926 * the move. */ 927 if (fdnode != tdnode) { 928 /* In case we are moving a directory, we have to adjust its 929 * parent to point to the new parent. */ 930 if (de->td_node->tn_type == VDIR) { 931 struct tmpfs_node *n; 932 933 /* Ensure the target directory is not a child of the 934 * directory being moved. Otherwise, we'd end up 935 * with stale nodes. */ 936 n = tdnode; 937 while (n != n->tn_spec.tn_dir.tn_parent) { 938 if (n == fnode) { 939 error = EINVAL; 940 goto out; 941 } 942 n = n->tn_spec.tn_dir.tn_parent; 943 } 944 945 /* Adjust the parent pointer. */ 946 TMPFS_VALIDATE_DIR(fnode); 947 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 948 949 /* As a result of changing the target of the '..' 950 * entry, the link count of the source and target 951 * directories has to be adjusted. */ 952 fdnode->tn_links--; 953 tdnode->tn_links++; 954 } 955 956 /* Do the move: just remove the entry from the source directory 957 * and insert it into the target one. */ 958 tmpfs_dir_detach(fdvp, de); 959 tmpfs_dir_attach(tdvp, de); 960 961 /* Notify listeners of fdvp about the change in the directory. 962 * We can do it at this point because we aren't touching fdvp 963 * any more below. */ 964 VN_KNOTE(fdvp, NOTE_WRITE); 965 } 966 967 /* If we are overwriting an entry, we have to remove the old one 968 * from the target directory. */ 969 if (tvp != NULL) { 970 KASSERT(tnode != NULL); 971 972 /* Remove the old entry from the target directory. 973 * Note! This relies on tmpfs_dir_attach() putting the new 974 * node on the end of the target's node list. */ 975 de2 = tmpfs_dir_lookup(tdnode, tcnp); 976 KASSERT(de2 != NULL); 977 KASSERT(de2->td_node == tnode); 978 tmpfs_dir_detach(tdvp, de2); 979 980 /* Free the directory entry we just deleted. Note that the 981 * node referred by it will not be removed until the vnode is 982 * really reclaimed. */ 983 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 984 } 985 986 /* If the name has changed, we need to make it effective by changing 987 * it in the directory entry. */ 988 if (newname != NULL) { 989 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 990 KASSERT(tcnp->cn_namelen < 0xffff); 991 992 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 993 de->td_namelen); 994 de->td_namelen = (uint16_t)namelen; 995 memcpy(newname, tcnp->cn_nameptr, namelen); 996 de->td_name = newname; 997 newname = NULL; 998 999 fnode->tn_status |= TMPFS_NODE_CHANGED; 1000 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1001 } 1002 out_ok: 1003 /* Notify listeners of tdvp about the change in the directory (either 1004 * because a new entry was added or because one was removed) and 1005 * listeners of fvp about the rename. */ 1006 VN_KNOTE(tdvp, NOTE_WRITE); 1007 VN_KNOTE(fvp, NOTE_RENAME); 1008 1009 error = 0; 1010 1011 out: 1012 if (fdnode != tdnode) 1013 VOP_UNLOCK(fdvp, 0); 1014 1015 out_unlocked: 1016 /* Release target nodes. */ 1017 if (tdvp == tvp) 1018 vrele(tdvp); 1019 else 1020 vput(tdvp); 1021 if (tvp != NULL) 1022 vput(tvp); 1023 1024 /* Release source nodes. */ 1025 vrele(fdvp); 1026 vrele(fvp); 1027 1028 if (newname != NULL) 1029 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 1030 1031 return error; 1032 } 1033 1034 /* --------------------------------------------------------------------- */ 1035 1036 int 1037 tmpfs_mkdir(void *v) 1038 { 1039 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1040 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1041 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1042 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1043 1044 KASSERT(vap->va_type == VDIR); 1045 1046 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1047 } 1048 1049 /* --------------------------------------------------------------------- */ 1050 1051 int 1052 tmpfs_rmdir(void *v) 1053 { 1054 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1055 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1056 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1057 1058 int error; 1059 struct tmpfs_dirent *de; 1060 struct tmpfs_mount *tmp; 1061 struct tmpfs_node *dnode; 1062 struct tmpfs_node *node; 1063 1064 KASSERT(VOP_ISLOCKED(dvp)); 1065 KASSERT(VOP_ISLOCKED(vp)); 1066 1067 tmp = VFS_TO_TMPFS(dvp->v_mount); 1068 dnode = VP_TO_TMPFS_DIR(dvp); 1069 node = VP_TO_TMPFS_DIR(vp); 1070 error = 0; 1071 1072 /* Directories with more than two entries ('.' and '..') cannot be 1073 * removed. */ 1074 if (node->tn_size > 0) { 1075 error = ENOTEMPTY; 1076 goto out; 1077 } 1078 1079 /* This invariant holds only if we are not trying to remove "..". 1080 * We checked for that above so this is safe now. */ 1081 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1082 1083 /* Get the directory entry associated with node (vp). */ 1084 de = tmpfs_dir_lookup(dnode, cnp); 1085 KASSERT(de); 1086 KASSERT(de->td_node == node); 1087 1088 /* Check flags to see if we are allowed to remove the directory. */ 1089 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1090 error = EPERM; 1091 goto out; 1092 } 1093 1094 /* Detach the directory entry from the directory (dnode). */ 1095 tmpfs_dir_detach(dvp, de); 1096 1097 node->tn_links--; 1098 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1099 TMPFS_NODE_MODIFIED; 1100 node->tn_spec.tn_dir.tn_parent->tn_links--; 1101 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1102 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1103 1104 /* Release the parent. */ 1105 cache_purge(dvp); /* XXX Is this needed? */ 1106 1107 /* Free the directory entry we just deleted. Note that the node 1108 * referred by it will not be removed until the vnode is really 1109 * reclaimed. */ 1110 tmpfs_free_dirent(tmp, de, true); 1111 1112 KASSERT(node->tn_links == 0); 1113 out: 1114 /* Release the nodes. */ 1115 vput(dvp); 1116 vput(vp); 1117 PNBUF_PUT(cnp->cn_pnbuf); 1118 1119 return error; 1120 } 1121 1122 /* --------------------------------------------------------------------- */ 1123 1124 int 1125 tmpfs_symlink(void *v) 1126 { 1127 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1128 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1129 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1130 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1131 char *target = ((struct vop_symlink_args *)v)->a_target; 1132 1133 KASSERT(vap->va_type == VLNK); 1134 1135 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1136 } 1137 1138 /* --------------------------------------------------------------------- */ 1139 1140 int 1141 tmpfs_readdir(void *v) 1142 { 1143 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1144 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1145 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1146 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1147 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1148 1149 int error; 1150 off_t startoff; 1151 off_t cnt; 1152 struct tmpfs_node *node; 1153 1154 KASSERT(VOP_ISLOCKED(vp)); 1155 1156 /* This operation only makes sense on directory nodes. */ 1157 if (vp->v_type != VDIR) { 1158 error = ENOTDIR; 1159 goto out; 1160 } 1161 1162 node = VP_TO_TMPFS_DIR(vp); 1163 1164 startoff = uio->uio_offset; 1165 1166 cnt = 0; 1167 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1168 error = tmpfs_dir_getdotdent(node, uio); 1169 if (error == -1) { 1170 error = 0; 1171 goto outok; 1172 } else if (error != 0) 1173 goto outok; 1174 cnt++; 1175 } 1176 1177 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1178 error = tmpfs_dir_getdotdotdent(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 error = tmpfs_dir_getdents(node, uio, &cnt); 1188 if (error == -1) 1189 error = 0; 1190 KASSERT(error >= 0); 1191 1192 outok: 1193 /* This label assumes that startoff has been 1194 * initialized. If the compiler didn't spit out warnings, we'd 1195 * simply make this one be 'out' and drop 'outok'. */ 1196 1197 if (eofflag != NULL) 1198 *eofflag = 1199 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1200 1201 /* Update NFS-related variables. */ 1202 if (error == 0 && cookies != NULL && ncookies != NULL) { 1203 off_t i; 1204 off_t off = startoff; 1205 struct tmpfs_dirent *de = NULL; 1206 1207 *ncookies = cnt; 1208 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1209 1210 for (i = 0; i < cnt; i++) { 1211 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1212 if (off == TMPFS_DIRCOOKIE_DOT) { 1213 off = TMPFS_DIRCOOKIE_DOTDOT; 1214 } else { 1215 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1216 de = TAILQ_FIRST(&node->tn_spec. 1217 tn_dir.tn_dir); 1218 } else if (de != NULL) { 1219 de = TAILQ_NEXT(de, td_entries); 1220 } else { 1221 de = tmpfs_dir_lookupbycookie(node, 1222 off); 1223 KASSERT(de != NULL); 1224 de = TAILQ_NEXT(de, td_entries); 1225 } 1226 if (de == NULL) { 1227 off = TMPFS_DIRCOOKIE_EOF; 1228 } else { 1229 off = tmpfs_dircookie(de); 1230 } 1231 } 1232 1233 (*cookies)[i] = off; 1234 } 1235 KASSERT(uio->uio_offset == off); 1236 } 1237 1238 out: 1239 KASSERT(VOP_ISLOCKED(vp)); 1240 1241 return error; 1242 } 1243 1244 /* --------------------------------------------------------------------- */ 1245 1246 int 1247 tmpfs_readlink(void *v) 1248 { 1249 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1250 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1251 1252 int error; 1253 struct tmpfs_node *node; 1254 1255 KASSERT(VOP_ISLOCKED(vp)); 1256 KASSERT(uio->uio_offset == 0); 1257 KASSERT(vp->v_type == VLNK); 1258 1259 node = VP_TO_TMPFS_NODE(vp); 1260 1261 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1262 MIN(node->tn_size, uio->uio_resid), uio); 1263 node->tn_status |= TMPFS_NODE_ACCESSED; 1264 1265 KASSERT(VOP_ISLOCKED(vp)); 1266 1267 return error; 1268 } 1269 1270 /* --------------------------------------------------------------------- */ 1271 1272 int 1273 tmpfs_inactive(void *v) 1274 { 1275 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1276 1277 struct tmpfs_node *node; 1278 1279 KASSERT(VOP_ISLOCKED(vp)); 1280 1281 node = VP_TO_TMPFS_NODE(vp); 1282 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1283 VOP_UNLOCK(vp, 0); 1284 1285 return 0; 1286 } 1287 1288 /* --------------------------------------------------------------------- */ 1289 1290 int 1291 tmpfs_reclaim(void *v) 1292 { 1293 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1294 1295 struct tmpfs_mount *tmp; 1296 struct tmpfs_node *node; 1297 1298 node = VP_TO_TMPFS_NODE(vp); 1299 tmp = VFS_TO_TMPFS(vp->v_mount); 1300 1301 cache_purge(vp); 1302 tmpfs_free_vp(vp); 1303 1304 /* If the node referenced by this vnode was deleted by the user, 1305 * we must free its associated data structures (now that the vnode 1306 * is being reclaimed). */ 1307 if (node->tn_links == 0) 1308 tmpfs_free_node(tmp, node); 1309 1310 KASSERT(vp->v_data == NULL); 1311 1312 return 0; 1313 } 1314 1315 /* --------------------------------------------------------------------- */ 1316 1317 int 1318 tmpfs_print(void *v) 1319 { 1320 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1321 1322 struct tmpfs_node *node; 1323 1324 node = VP_TO_TMPFS_NODE(vp); 1325 1326 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1327 node, node->tn_flags, node->tn_links); 1328 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1329 ", status 0x%x", 1330 node->tn_mode, node->tn_uid, node->tn_gid, 1331 (uintmax_t)node->tn_size, node->tn_status); 1332 if (vp->v_type == VFIFO) 1333 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 1334 printf("\n"); 1335 1336 return 0; 1337 } 1338 1339 /* --------------------------------------------------------------------- */ 1340 1341 int 1342 tmpfs_pathconf(void *v) 1343 { 1344 int name = ((struct vop_pathconf_args *)v)->a_name; 1345 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1346 1347 int error; 1348 1349 error = 0; 1350 1351 switch (name) { 1352 case _PC_LINK_MAX: 1353 *retval = LINK_MAX; 1354 break; 1355 1356 case _PC_NAME_MAX: 1357 *retval = NAME_MAX; 1358 break; 1359 1360 case _PC_PATH_MAX: 1361 *retval = PATH_MAX; 1362 break; 1363 1364 case _PC_PIPE_BUF: 1365 *retval = PIPE_BUF; 1366 break; 1367 1368 case _PC_CHOWN_RESTRICTED: 1369 *retval = 1; 1370 break; 1371 1372 case _PC_NO_TRUNC: 1373 *retval = 1; 1374 break; 1375 1376 case _PC_SYNC_IO: 1377 *retval = 1; 1378 break; 1379 1380 case _PC_FILESIZEBITS: 1381 *retval = 0; /* XXX Don't know which value should I return. */ 1382 break; 1383 1384 default: 1385 error = EINVAL; 1386 } 1387 1388 return error; 1389 } 1390 1391 /* --------------------------------------------------------------------- */ 1392 1393 int 1394 tmpfs_advlock(void *v) 1395 { 1396 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1397 1398 struct tmpfs_node *node; 1399 1400 node = VP_TO_TMPFS_NODE(vp); 1401 1402 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1403 } 1404 1405 /* --------------------------------------------------------------------- */ 1406 1407 int 1408 tmpfs_getpages(void *v) 1409 { 1410 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1411 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1412 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1413 int *count = ((struct vop_getpages_args *)v)->a_count; 1414 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1415 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1416 int advice = ((struct vop_getpages_args *)v)->a_advice; 1417 int flags = ((struct vop_getpages_args *)v)->a_flags; 1418 1419 int error; 1420 int i; 1421 struct tmpfs_node *node; 1422 struct uvm_object *uobj; 1423 int npages = *count; 1424 1425 KASSERT(vp->v_type == VREG); 1426 KASSERT(mutex_owned(vp->v_interlock)); 1427 1428 node = VP_TO_TMPFS_NODE(vp); 1429 uobj = node->tn_spec.tn_reg.tn_aobj; 1430 1431 /* We currently don't rely on PGO_PASTEOF. */ 1432 1433 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1434 if ((flags & PGO_LOCKED) == 0) 1435 mutex_exit(vp->v_interlock); 1436 return EINVAL; 1437 } 1438 1439 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1440 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1441 } 1442 1443 if ((flags & PGO_LOCKED) != 0) 1444 return EBUSY; 1445 1446 if ((flags & PGO_NOTIMESTAMP) == 0) { 1447 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1448 node->tn_status |= TMPFS_NODE_ACCESSED; 1449 1450 if ((access_type & VM_PROT_WRITE) != 0) 1451 node->tn_status |= TMPFS_NODE_MODIFIED; 1452 } 1453 1454 mutex_exit(vp->v_interlock); 1455 1456 /* 1457 * Make sure that the array on which we will store the 1458 * gotten pages is clean. Otherwise uao_get (pointed to by 1459 * the pgo_get below) gets confused and does not return the 1460 * appropriate pages. 1461 * 1462 * XXX This shall be revisited when kern/32166 is addressed 1463 * because the loop to clean m[i] will most likely be redundant 1464 * as well as the PGO_ALLPAGES flag. 1465 */ 1466 if (m != NULL) 1467 for (i = 0; i < npages; i++) 1468 m[i] = NULL; 1469 mutex_enter(uobj->vmobjlock); 1470 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1471 access_type, advice, flags | PGO_ALLPAGES); 1472 #if defined(DEBUG) 1473 { 1474 /* Make sure that all the pages we return are valid. */ 1475 int dbgi; 1476 if (error == 0 && m != NULL) 1477 for (dbgi = 0; dbgi < npages; dbgi++) 1478 KASSERT(m[dbgi] != NULL); 1479 } 1480 #endif 1481 1482 return error; 1483 } 1484 1485 /* --------------------------------------------------------------------- */ 1486 1487 int 1488 tmpfs_putpages(void *v) 1489 { 1490 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1491 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1492 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1493 int flags = ((struct vop_putpages_args *)v)->a_flags; 1494 1495 int error; 1496 struct tmpfs_node *node; 1497 struct uvm_object *uobj; 1498 1499 KASSERT(mutex_owned(vp->v_interlock)); 1500 1501 node = VP_TO_TMPFS_NODE(vp); 1502 1503 if (vp->v_type != VREG) { 1504 mutex_exit(vp->v_interlock); 1505 return 0; 1506 } 1507 1508 uobj = node->tn_spec.tn_reg.tn_aobj; 1509 mutex_exit(vp->v_interlock); 1510 1511 mutex_enter(uobj->vmobjlock); 1512 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1513 1514 /* XXX mtime */ 1515 1516 return error; 1517 } 1518
Indexes created Tue Sep 30 20:09:53 GMT 2025