tmpfs_vnops.c revision 1.49.8.1
1 /* $NetBSD: tmpfs_vnops.c,v 1.49.8.1 2008/05/18 12:35:03 yamt 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 1.49.8.1 2008/05/18 12:35:03 yamt Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/lockf.h> 52 #include <sys/kauth.h> 53 54 #include <uvm/uvm.h> 55 56 #include <miscfs/fifofs/fifo.h> 57 #include <fs/tmpfs/tmpfs_vnops.h> 58 #include <fs/tmpfs/tmpfs.h> 59 60 /* --------------------------------------------------------------------- */ 61 62 /* 63 * vnode operations vector used for files stored in a tmpfs file system. 64 */ 65 int (**tmpfs_vnodeop_p)(void *); 66 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 67 { &vop_default_desc, vn_default_error }, 68 { &vop_lookup_desc, tmpfs_lookup }, 69 { &vop_create_desc, tmpfs_create }, 70 { &vop_mknod_desc, tmpfs_mknod }, 71 { &vop_open_desc, tmpfs_open }, 72 { &vop_close_desc, tmpfs_close }, 73 { &vop_access_desc, tmpfs_access }, 74 { &vop_getattr_desc, tmpfs_getattr }, 75 { &vop_setattr_desc, tmpfs_setattr }, 76 { &vop_read_desc, tmpfs_read }, 77 { &vop_write_desc, tmpfs_write }, 78 { &vop_ioctl_desc, tmpfs_ioctl }, 79 { &vop_fcntl_desc, tmpfs_fcntl }, 80 { &vop_poll_desc, tmpfs_poll }, 81 { &vop_kqfilter_desc, tmpfs_kqfilter }, 82 { &vop_revoke_desc, tmpfs_revoke }, 83 { &vop_mmap_desc, tmpfs_mmap }, 84 { &vop_fsync_desc, tmpfs_fsync }, 85 { &vop_seek_desc, tmpfs_seek }, 86 { &vop_remove_desc, tmpfs_remove }, 87 { &vop_link_desc, tmpfs_link }, 88 { &vop_rename_desc, tmpfs_rename }, 89 { &vop_mkdir_desc, tmpfs_mkdir }, 90 { &vop_rmdir_desc, tmpfs_rmdir }, 91 { &vop_symlink_desc, tmpfs_symlink }, 92 { &vop_readdir_desc, tmpfs_readdir }, 93 { &vop_readlink_desc, tmpfs_readlink }, 94 { &vop_abortop_desc, tmpfs_abortop }, 95 { &vop_inactive_desc, tmpfs_inactive }, 96 { &vop_reclaim_desc, tmpfs_reclaim }, 97 { &vop_lock_desc, tmpfs_lock }, 98 { &vop_unlock_desc, tmpfs_unlock }, 99 { &vop_bmap_desc, tmpfs_bmap }, 100 { &vop_strategy_desc, tmpfs_strategy }, 101 { &vop_print_desc, tmpfs_print }, 102 { &vop_pathconf_desc, tmpfs_pathconf }, 103 { &vop_islocked_desc, tmpfs_islocked }, 104 { &vop_advlock_desc, tmpfs_advlock }, 105 { &vop_bwrite_desc, tmpfs_bwrite }, 106 { &vop_getpages_desc, tmpfs_getpages }, 107 { &vop_putpages_desc, tmpfs_putpages }, 108 { NULL, NULL } 109 }; 110 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 111 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 112 113 /* --------------------------------------------------------------------- */ 114 115 int 116 tmpfs_lookup(void *v) 117 { 118 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 119 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 120 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 121 122 int error; 123 struct tmpfs_dirent *de; 124 struct tmpfs_node *dnode; 125 126 KASSERT(VOP_ISLOCKED(dvp)); 127 128 dnode = VP_TO_TMPFS_DIR(dvp); 129 *vpp = NULL; 130 131 /* Check accessibility of requested node as a first step. */ 132 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 133 if (error != 0) 134 goto out; 135 136 /* If requesting the last path component on a read-only file system 137 * with a write operation, deny it. */ 138 if ((cnp->cn_flags & ISLASTCN) && 139 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 140 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 141 error = EROFS; 142 goto out; 143 } 144 145 /* Avoid doing a linear scan of the directory if the requested 146 * directory/name couple is already in the cache. */ 147 error = cache_lookup(dvp, vpp, cnp); 148 if (error >= 0) 149 goto out; 150 151 /* We cannot be requesting the parent directory of the root node. */ 152 KASSERT(IMPLIES(dnode->tn_type == VDIR && 153 dnode->tn_spec.tn_dir.tn_parent == dnode, 154 !(cnp->cn_flags & ISDOTDOT))); 155 156 if (cnp->cn_flags & ISDOTDOT) { 157 VOP_UNLOCK(dvp, 0); 158 159 /* Allocate a new vnode on the matching entry. */ 160 error = tmpfs_alloc_vp(dvp->v_mount, 161 dnode->tn_spec.tn_dir.tn_parent, vpp); 162 163 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 164 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 165 VREF(dvp); 166 *vpp = dvp; 167 error = 0; 168 } else { 169 de = tmpfs_dir_lookup(dnode, cnp); 170 if (de == NULL) { 171 /* The entry was not found in the directory. 172 * This is OK iff we are creating or renaming an 173 * entry and are working on the last component of 174 * the path name. */ 175 if ((cnp->cn_flags & ISLASTCN) && 176 (cnp->cn_nameiop == CREATE || \ 177 cnp->cn_nameiop == RENAME)) { 178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 179 if (error != 0) 180 goto out; 181 182 /* Keep the component name in the buffer for 183 * future uses. */ 184 cnp->cn_flags |= SAVENAME; 185 186 error = EJUSTRETURN; 187 } else 188 error = ENOENT; 189 } else { 190 struct tmpfs_node *tnode; 191 192 /* The entry was found, so get its associated 193 * tmpfs_node. */ 194 tnode = de->td_node; 195 196 /* If we are not at the last path component and 197 * found a non-directory or non-link entry (which 198 * may itself be pointing to a directory), raise 199 * an error. */ 200 if ((tnode->tn_type != VDIR && 201 tnode->tn_type != VLNK) && 202 !(cnp->cn_flags & ISLASTCN)) { 203 error = ENOTDIR; 204 goto out; 205 } 206 207 /* If we are deleting or renaming the entry, keep 208 * track of its tmpfs_dirent so that it can be 209 * easily deleted later. */ 210 if ((cnp->cn_flags & ISLASTCN) && 211 (cnp->cn_nameiop == DELETE || 212 cnp->cn_nameiop == RENAME)) { 213 if ((dnode->tn_mode & S_ISTXT) != 0 && 214 kauth_authorize_generic(cnp->cn_cred, 215 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 return EPERM; 219 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 220 if (error != 0) 221 goto out; 222 } else 223 de = NULL; 224 225 /* Allocate a new vnode on the matching entry. */ 226 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 227 } 228 } 229 230 /* Store the result of this lookup in the cache. Avoid this if the 231 * request was for creation, as it does not improve timings on 232 * emprical tests. */ 233 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 234 (cnp->cn_flags & ISDOTDOT) == 0) 235 cache_enter(dvp, *vpp, cnp); 236 237 out: 238 /* If there were no errors, *vpp cannot be null and it must be 239 * locked. */ 240 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 241 242 /* dvp must always be locked. */ 243 KASSERT(VOP_ISLOCKED(dvp)); 244 245 return error; 246 } 247 248 /* --------------------------------------------------------------------- */ 249 250 int 251 tmpfs_create(void *v) 252 { 253 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 254 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 255 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 256 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 257 258 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 259 260 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 261 } 262 /* --------------------------------------------------------------------- */ 263 264 int 265 tmpfs_mknod(void *v) 266 { 267 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 268 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 269 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 270 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 271 272 if (vap->va_type != VBLK && vap->va_type != VCHR && 273 vap->va_type != VFIFO) 274 return EINVAL; 275 276 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 277 } 278 279 /* --------------------------------------------------------------------- */ 280 281 int 282 tmpfs_open(void *v) 283 { 284 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 285 int mode = ((struct vop_open_args *)v)->a_mode; 286 287 int error; 288 struct tmpfs_node *node; 289 290 KASSERT(VOP_ISLOCKED(vp)); 291 292 node = VP_TO_TMPFS_NODE(vp); 293 294 /* The file is still active but all its names have been removed 295 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 296 * it is about to die. */ 297 if (node->tn_links < 1) { 298 error = ENOENT; 299 goto out; 300 } 301 302 /* If the file is marked append-only, deny write requests. */ 303 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 304 error = EPERM; 305 else 306 error = 0; 307 308 out: 309 KASSERT(VOP_ISLOCKED(vp)); 310 311 return error; 312 } 313 314 /* --------------------------------------------------------------------- */ 315 316 int 317 tmpfs_close(void *v) 318 { 319 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 320 321 struct tmpfs_node *node; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 node = VP_TO_TMPFS_NODE(vp); 326 327 if (node->tn_links > 0) { 328 /* Update node times. No need to do it if the node has 329 * been deleted, because it will vanish after we return. */ 330 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 331 } 332 333 return 0; 334 } 335 336 /* --------------------------------------------------------------------- */ 337 338 int 339 tmpfs_access(void *v) 340 { 341 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 342 int mode = ((struct vop_access_args *)v)->a_mode; 343 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 344 345 int error; 346 struct tmpfs_node *node; 347 348 KASSERT(VOP_ISLOCKED(vp)); 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 switch (vp->v_type) { 353 case VDIR: 354 /* FALLTHROUGH */ 355 case VLNK: 356 /* FALLTHROUGH */ 357 case VREG: 358 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 359 error = EROFS; 360 goto out; 361 } 362 break; 363 364 case VBLK: 365 /* FALLTHROUGH */ 366 case VCHR: 367 /* FALLTHROUGH */ 368 case VSOCK: 369 /* FALLTHROUGH */ 370 case VFIFO: 371 break; 372 373 default: 374 error = EINVAL; 375 goto out; 376 } 377 378 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 379 error = EPERM; 380 goto out; 381 } 382 383 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 384 node->tn_gid, mode, cred); 385 386 out: 387 KASSERT(VOP_ISLOCKED(vp)); 388 389 return error; 390 } 391 392 /* --------------------------------------------------------------------- */ 393 394 int 395 tmpfs_getattr(void *v) 396 { 397 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 398 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 399 400 struct tmpfs_node *node; 401 402 node = VP_TO_TMPFS_NODE(vp); 403 404 VATTR_NULL(vap); 405 406 tmpfs_itimes(vp, NULL, NULL); 407 408 vap->va_type = vp->v_type; 409 vap->va_mode = node->tn_mode; 410 vap->va_nlink = node->tn_links; 411 vap->va_uid = node->tn_uid; 412 vap->va_gid = node->tn_gid; 413 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 414 vap->va_fileid = node->tn_id; 415 vap->va_size = node->tn_size; 416 vap->va_blocksize = PAGE_SIZE; 417 vap->va_atime = node->tn_atime; 418 vap->va_mtime = node->tn_mtime; 419 vap->va_ctime = node->tn_ctime; 420 vap->va_birthtime = node->tn_birthtime; 421 vap->va_gen = node->tn_gen; 422 vap->va_flags = node->tn_flags; 423 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 424 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 425 vap->va_bytes = round_page(node->tn_size); 426 vap->va_filerev = VNOVAL; 427 vap->va_vaflags = 0; 428 vap->va_spare = VNOVAL; /* XXX */ 429 430 return 0; 431 } 432 433 /* --------------------------------------------------------------------- */ 434 435 /* XXX Should this operation be atomic? I think it should, but code in 436 * XXX other places (e.g., ufs) doesn't seem to be... */ 437 int 438 tmpfs_setattr(void *v) 439 { 440 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 441 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 442 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 443 struct lwp *l = curlwp; 444 445 int error; 446 447 KASSERT(VOP_ISLOCKED(vp)); 448 449 error = 0; 450 451 /* Abort if any unsettable attribute is given. */ 452 if (vap->va_type != VNON || 453 vap->va_nlink != VNOVAL || 454 vap->va_fsid != VNOVAL || 455 vap->va_fileid != VNOVAL || 456 vap->va_blocksize != VNOVAL || 457 vap->va_ctime.tv_sec != VNOVAL || 458 vap->va_ctime.tv_nsec != VNOVAL || 459 vap->va_birthtime.tv_sec != VNOVAL || 460 vap->va_birthtime.tv_nsec != VNOVAL || 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 && ((vap->va_atime.tv_sec != VNOVAL && 479 vap->va_atime.tv_nsec != VNOVAL) || 480 (vap->va_mtime.tv_sec != VNOVAL && 481 vap->va_mtime.tv_nsec != VNOVAL))) 482 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 483 vap->va_vaflags, cred, l); 484 485 /* Update the node times. We give preference to the error codes 486 * generated by this function rather than the ones that may arise 487 * from tmpfs_update. */ 488 tmpfs_update(vp, NULL, NULL, 0); 489 490 KASSERT(VOP_ISLOCKED(vp)); 491 492 return error; 493 } 494 495 /* --------------------------------------------------------------------- */ 496 497 int 498 tmpfs_read(void *v) 499 { 500 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 501 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 502 503 int error; 504 int flags; 505 struct tmpfs_node *node; 506 struct uvm_object *uobj; 507 508 KASSERT(VOP_ISLOCKED(vp)); 509 510 node = VP_TO_TMPFS_NODE(vp); 511 512 if (vp->v_type != VREG) { 513 error = EISDIR; 514 goto out; 515 } 516 517 if (uio->uio_offset < 0) { 518 error = EINVAL; 519 goto out; 520 } 521 522 node->tn_status |= TMPFS_NODE_ACCESSED; 523 524 uobj = node->tn_spec.tn_reg.tn_aobj; 525 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 526 error = 0; 527 while (error == 0 && uio->uio_resid > 0) { 528 vsize_t len; 529 void *win; 530 531 if (node->tn_size <= uio->uio_offset) 532 break; 533 534 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 535 if (len == 0) 536 break; 537 538 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 539 UBC_READ); 540 error = uiomove(win, len, uio); 541 ubc_release(win, flags); 542 } 543 544 out: 545 KASSERT(VOP_ISLOCKED(vp)); 546 547 return error; 548 } 549 550 /* --------------------------------------------------------------------- */ 551 552 int 553 tmpfs_write(void *v) 554 { 555 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 556 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 557 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 558 559 bool extended; 560 int error; 561 int flags; 562 off_t oldsize; 563 struct tmpfs_node *node; 564 struct uvm_object *uobj; 565 566 KASSERT(VOP_ISLOCKED(vp)); 567 568 node = VP_TO_TMPFS_NODE(vp); 569 oldsize = node->tn_size; 570 571 if (uio->uio_offset < 0 || vp->v_type != VREG) { 572 error = EINVAL; 573 goto out; 574 } 575 576 if (uio->uio_resid == 0) { 577 error = 0; 578 goto out; 579 } 580 581 if (ioflag & IO_APPEND) 582 uio->uio_offset = node->tn_size; 583 584 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 585 if (extended) { 586 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 587 if (error != 0) 588 goto out; 589 } 590 591 uobj = node->tn_spec.tn_reg.tn_aobj; 592 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 593 error = 0; 594 while (error == 0 && uio->uio_resid > 0) { 595 vsize_t len; 596 void *win; 597 598 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 599 if (len == 0) 600 break; 601 602 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 603 UBC_WRITE); 604 error = uiomove(win, len, uio); 605 ubc_release(win, flags); 606 } 607 608 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 609 (extended ? TMPFS_NODE_CHANGED : 0); 610 611 if (error != 0) 612 (void)tmpfs_reg_resize(vp, oldsize); 613 614 VN_KNOTE(vp, NOTE_WRITE); 615 616 out: 617 KASSERT(VOP_ISLOCKED(vp)); 618 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 619 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 620 621 return error; 622 } 623 624 /* --------------------------------------------------------------------- */ 625 626 int 627 tmpfs_fsync(void *v) 628 { 629 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 630 631 KASSERT(VOP_ISLOCKED(vp)); 632 633 tmpfs_update(vp, NULL, NULL, 0); 634 635 return 0; 636 } 637 638 /* --------------------------------------------------------------------- */ 639 640 int 641 tmpfs_remove(void *v) 642 { 643 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 644 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 645 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 646 647 int error; 648 struct tmpfs_dirent *de; 649 struct tmpfs_mount *tmp; 650 struct tmpfs_node *dnode; 651 struct tmpfs_node *node; 652 653 KASSERT(VOP_ISLOCKED(dvp)); 654 KASSERT(VOP_ISLOCKED(vp)); 655 656 if (vp->v_type == VDIR) { 657 error = EPERM; 658 goto out; 659 } 660 661 dnode = VP_TO_TMPFS_DIR(dvp); 662 node = VP_TO_TMPFS_NODE(vp); 663 tmp = VFS_TO_TMPFS(vp->v_mount); 664 de = tmpfs_dir_lookup(dnode, cnp); 665 if (de == NULL) { 666 error = ENOENT; 667 goto out; 668 } 669 KASSERT(de->td_node == node); 670 671 /* Files marked as immutable or append-only cannot be deleted. */ 672 if (node->tn_flags & (IMMUTABLE | APPEND)) { 673 error = EPERM; 674 goto out; 675 } 676 677 /* Remove the entry from the directory; as it is a file, we do not 678 * have to change the number of hard links of the directory. */ 679 tmpfs_dir_detach(dvp, de); 680 681 /* Free the directory entry we just deleted. Note that the node 682 * referred by it will not be removed until the vnode is really 683 * reclaimed. */ 684 tmpfs_free_dirent(tmp, de, true); 685 686 error = 0; 687 688 out: 689 vput(vp); 690 if (dvp == vp) 691 vrele(dvp); 692 else 693 vput(dvp); 694 695 return error; 696 } 697 698 /* --------------------------------------------------------------------- */ 699 700 int 701 tmpfs_link(void *v) 702 { 703 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 704 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 705 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 706 707 int error; 708 struct tmpfs_dirent *de; 709 struct tmpfs_node *dnode; 710 struct tmpfs_node *node; 711 712 KASSERT(VOP_ISLOCKED(dvp)); 713 KASSERT(cnp->cn_flags & HASBUF); 714 KASSERT(dvp != vp); /* XXX When can this be false? */ 715 716 dnode = VP_TO_TMPFS_DIR(dvp); 717 node = VP_TO_TMPFS_NODE(vp); 718 719 /* Lock vp because we will need to run tmpfs_update over it, which 720 * needs the vnode to be locked. */ 721 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 722 if (error != 0) 723 goto out1; 724 725 /* XXX: Why aren't the following two tests done by the caller? */ 726 727 /* Hard links of directories are forbidden. */ 728 if (vp->v_type == VDIR) { 729 error = EPERM; 730 goto out; 731 } 732 733 /* Cannot create cross-device links. */ 734 if (dvp->v_mount != vp->v_mount) { 735 error = EXDEV; 736 goto out; 737 } 738 739 /* Ensure that we do not overflow the maximum number of links imposed 740 * by the system. */ 741 KASSERT(node->tn_links <= LINK_MAX); 742 if (node->tn_links == LINK_MAX) { 743 error = EMLINK; 744 goto out; 745 } 746 747 /* We cannot create links of files marked immutable or append-only. */ 748 if (node->tn_flags & (IMMUTABLE | APPEND)) { 749 error = EPERM; 750 goto out; 751 } 752 753 /* Allocate a new directory entry to represent the node. */ 754 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 755 cnp->cn_nameptr, cnp->cn_namelen, &de); 756 if (error != 0) 757 goto out; 758 759 /* Insert the new directory entry into the appropriate directory. */ 760 tmpfs_dir_attach(dvp, de); 761 762 /* vp link count has changed, so update node times. */ 763 node->tn_status |= TMPFS_NODE_CHANGED; 764 tmpfs_update(vp, NULL, NULL, 0); 765 766 error = 0; 767 768 out: 769 VOP_UNLOCK(vp, 0); 770 out1: 771 PNBUF_PUT(cnp->cn_pnbuf); 772 773 vput(dvp); 774 775 return error; 776 } 777 778 /* --------------------------------------------------------------------- */ 779 780 int 781 tmpfs_rename(void *v) 782 { 783 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 784 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 785 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 786 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 787 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 788 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 789 790 char *newname; 791 int error; 792 struct tmpfs_dirent *de, *de2; 793 struct tmpfs_mount *tmp; 794 struct tmpfs_node *fdnode; 795 struct tmpfs_node *fnode; 796 struct tmpfs_node *tnode; 797 struct tmpfs_node *tdnode; 798 size_t namelen; 799 800 KASSERT(VOP_ISLOCKED(tdvp)); 801 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 802 KASSERT(fcnp->cn_flags & HASBUF); 803 KASSERT(tcnp->cn_flags & HASBUF); 804 805 newname = NULL; 806 namelen = 0; 807 tmp = NULL; 808 809 /* Disallow cross-device renames. */ 810 if (fvp->v_mount != tdvp->v_mount || 811 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 812 error = EXDEV; 813 goto out_unlocked; 814 } 815 816 fnode = VP_TO_TMPFS_NODE(fvp); 817 fdnode = VP_TO_TMPFS_DIR(fdvp); 818 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 819 tdnode = VP_TO_TMPFS_DIR(tdvp); 820 tmp = VFS_TO_TMPFS(tdvp->v_mount); 821 822 /* If we need to move the directory between entries, lock the 823 * source so that we can safely operate on it. */ 824 825 /* XXX: this is a potential locking order violation! */ 826 if (fdnode != tdnode) { 827 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 828 if (error != 0) 829 goto out_unlocked; 830 } 831 832 de = tmpfs_dir_lookup(fdnode, fcnp); 833 if (de == NULL) { 834 error = ENOENT; 835 goto out; 836 } 837 KASSERT(de->td_node == fnode); 838 839 /* If source and target are the same file, there is nothing to do. */ 840 if (fvp == tvp) { 841 error = 0; 842 goto out; 843 } 844 845 /* Avoid manipulating '.' and '..' entries. */ 846 if (de == NULL) { 847 KASSERT(fvp->v_type == VDIR); 848 error = EINVAL; 849 goto out; 850 } 851 KASSERT(de->td_node == fnode); 852 853 /* If replacing an existing entry, ensure we can do the operation. */ 854 if (tvp != NULL) { 855 KASSERT(tnode != NULL); 856 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 857 if (tnode->tn_size > 0) { 858 error = ENOTEMPTY; 859 goto out; 860 } 861 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 862 error = ENOTDIR; 863 goto out; 864 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 865 error = EISDIR; 866 goto out; 867 } else { 868 KASSERT(fnode->tn_type != VDIR && 869 tnode->tn_type != VDIR); 870 } 871 } 872 873 /* Ensure that we have enough memory to hold the new name, if it 874 * has to be changed. */ 875 namelen = tcnp->cn_namelen; 876 if (fcnp->cn_namelen != tcnp->cn_namelen || 877 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 878 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 879 if (newname == NULL) { 880 error = ENOSPC; 881 goto out; 882 } 883 } 884 885 /* If the node is being moved to another directory, we have to do 886 * the move. */ 887 if (fdnode != tdnode) { 888 /* In case we are moving a directory, we have to adjust its 889 * parent to point to the new parent. */ 890 if (de->td_node->tn_type == VDIR) { 891 struct tmpfs_node *n; 892 893 /* Ensure the target directory is not a child of the 894 * directory being moved. Otherwise, we'd end up 895 * with stale nodes. */ 896 n = tdnode; 897 while (n != n->tn_spec.tn_dir.tn_parent) { 898 if (n == fnode) { 899 error = EINVAL; 900 goto out; 901 } 902 n = n->tn_spec.tn_dir.tn_parent; 903 } 904 905 /* Adjust the parent pointer. */ 906 TMPFS_VALIDATE_DIR(fnode); 907 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 908 909 /* As a result of changing the target of the '..' 910 * entry, the link count of the source and target 911 * directories has to be adjusted. */ 912 fdnode->tn_links--; 913 tdnode->tn_links++; 914 } 915 916 /* Do the move: just remove the entry from the source directory 917 * and insert it into the target one. */ 918 tmpfs_dir_detach(fdvp, de); 919 tmpfs_dir_attach(tdvp, de); 920 921 /* Notify listeners of fdvp about the change in the directory. 922 * We can do it at this point because we aren't touching fdvp 923 * any more below. */ 924 VN_KNOTE(fdvp, NOTE_WRITE); 925 } 926 927 /* If we are overwriting an entry, we have to remove the old one 928 * from the target directory. */ 929 if (tvp != NULL) { 930 KASSERT(tnode != NULL); 931 932 /* Remove the old entry from the target directory. 933 * Note! This relies on tmpfs_dir_attach() putting the new 934 * node on the end of the target's node list. */ 935 de2 = tmpfs_dir_lookup(tdnode, tcnp); 936 KASSERT(de2 != NULL); 937 KASSERT(de2->td_node == tnode); 938 tmpfs_dir_detach(tdvp, de2); 939 940 /* Free the directory entry we just deleted. Note that the 941 * node referred by it will not be removed until the vnode is 942 * really reclaimed. */ 943 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 944 } 945 946 /* If the name has changed, we need to make it effective by changing 947 * it in the directory entry. */ 948 if (newname != NULL) { 949 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 950 KASSERT(tcnp->cn_namelen < 0xffff); 951 952 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 953 de->td_namelen); 954 de->td_namelen = (uint16_t)namelen; 955 memcpy(newname, tcnp->cn_nameptr, namelen); 956 de->td_name = newname; 957 newname = NULL; 958 959 fnode->tn_status |= TMPFS_NODE_CHANGED; 960 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 961 } 962 963 /* Notify listeners of tdvp about the change in the directory (either 964 * because a new entry was added or because one was removed) and 965 * listeners of fvp about the rename. */ 966 VN_KNOTE(tdvp, NOTE_WRITE); 967 VN_KNOTE(fvp, NOTE_RENAME); 968 969 error = 0; 970 971 out: 972 if (fdnode != tdnode) 973 VOP_UNLOCK(fdvp, 0); 974 975 out_unlocked: 976 /* Release target nodes. */ 977 if (tdvp == tvp) 978 vrele(tdvp); 979 else 980 vput(tdvp); 981 if (tvp != NULL) 982 vput(tvp); 983 984 /* Release source nodes. */ 985 vrele(fdvp); 986 vrele(fvp); 987 988 if (newname != NULL) 989 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 990 991 return error; 992 } 993 994 /* --------------------------------------------------------------------- */ 995 996 int 997 tmpfs_mkdir(void *v) 998 { 999 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1000 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1001 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1002 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1003 1004 KASSERT(vap->va_type == VDIR); 1005 1006 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1007 } 1008 1009 /* --------------------------------------------------------------------- */ 1010 1011 int 1012 tmpfs_rmdir(void *v) 1013 { 1014 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1015 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1016 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1017 1018 int error; 1019 struct tmpfs_dirent *de; 1020 struct tmpfs_mount *tmp; 1021 struct tmpfs_node *dnode; 1022 struct tmpfs_node *node; 1023 1024 KASSERT(VOP_ISLOCKED(dvp)); 1025 KASSERT(VOP_ISLOCKED(vp)); 1026 1027 tmp = VFS_TO_TMPFS(dvp->v_mount); 1028 dnode = VP_TO_TMPFS_DIR(dvp); 1029 node = VP_TO_TMPFS_DIR(vp); 1030 error = 0; 1031 1032 /* Directories with more than two entries ('.' and '..') cannot be 1033 * removed. */ 1034 if (node->tn_size > 0) { 1035 error = ENOTEMPTY; 1036 goto out; 1037 } 1038 1039 /* This invariant holds only if we are not trying to remove "..". 1040 * We checked for that above so this is safe now. */ 1041 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1042 1043 /* Get the directory entry associated with node (vp). */ 1044 de = tmpfs_dir_lookup(dnode, cnp); 1045 if (de == NULL) { 1046 error = ENOENT; 1047 goto out; 1048 } 1049 KASSERT(de->td_node == node); 1050 1051 /* Check flags to see if we are allowed to remove the directory. */ 1052 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1053 error = EPERM; 1054 goto out; 1055 } 1056 1057 /* Detach the directory entry from the directory (dnode). */ 1058 tmpfs_dir_detach(dvp, de); 1059 1060 node->tn_links--; 1061 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1062 TMPFS_NODE_MODIFIED; 1063 node->tn_spec.tn_dir.tn_parent->tn_links--; 1064 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1065 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1066 1067 /* Release the parent. */ 1068 cache_purge(dvp); /* XXX Is this needed? */ 1069 1070 /* Free the directory entry we just deleted. Note that the node 1071 * referred by it will not be removed until the vnode is really 1072 * reclaimed. */ 1073 tmpfs_free_dirent(tmp, de, true); 1074 1075 KASSERT(node->tn_links == 0); 1076 out: 1077 /* Release the nodes. */ 1078 vput(dvp); 1079 vput(vp); 1080 1081 return error; 1082 } 1083 1084 /* --------------------------------------------------------------------- */ 1085 1086 int 1087 tmpfs_symlink(void *v) 1088 { 1089 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1090 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1091 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1092 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1093 char *target = ((struct vop_symlink_args *)v)->a_target; 1094 1095 KASSERT(vap->va_type == VLNK); 1096 1097 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1098 } 1099 1100 /* --------------------------------------------------------------------- */ 1101 1102 int 1103 tmpfs_readdir(void *v) 1104 { 1105 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1106 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1107 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1108 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1109 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1110 1111 int error; 1112 off_t startoff; 1113 off_t cnt; 1114 struct tmpfs_node *node; 1115 1116 KASSERT(VOP_ISLOCKED(vp)); 1117 1118 /* This operation only makes sense on directory nodes. */ 1119 if (vp->v_type != VDIR) { 1120 error = ENOTDIR; 1121 goto out; 1122 } 1123 1124 node = VP_TO_TMPFS_DIR(vp); 1125 1126 startoff = uio->uio_offset; 1127 1128 cnt = 0; 1129 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1130 error = tmpfs_dir_getdotdent(node, uio); 1131 if (error == -1) { 1132 error = 0; 1133 goto outok; 1134 } else if (error != 0) 1135 goto outok; 1136 cnt++; 1137 } 1138 1139 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1140 error = tmpfs_dir_getdotdotdent(node, uio); 1141 if (error == -1) { 1142 error = 0; 1143 goto outok; 1144 } else if (error != 0) 1145 goto outok; 1146 cnt++; 1147 } 1148 1149 error = tmpfs_dir_getdents(node, uio, &cnt); 1150 if (error == -1) 1151 error = 0; 1152 KASSERT(error >= 0); 1153 1154 outok: 1155 /* This label assumes that startoff has been 1156 * initialized. If the compiler didn't spit out warnings, we'd 1157 * simply make this one be 'out' and drop 'outok'. */ 1158 1159 if (eofflag != NULL) 1160 *eofflag = 1161 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1162 1163 /* Update NFS-related variables. */ 1164 if (error == 0 && cookies != NULL && ncookies != NULL) { 1165 off_t i; 1166 off_t off = startoff; 1167 struct tmpfs_dirent *de = NULL; 1168 1169 *ncookies = cnt; 1170 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1171 1172 for (i = 0; i < cnt; i++) { 1173 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1174 if (off == TMPFS_DIRCOOKIE_DOT) { 1175 off = TMPFS_DIRCOOKIE_DOTDOT; 1176 } else { 1177 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1178 de = TAILQ_FIRST(&node->tn_spec. 1179 tn_dir.tn_dir); 1180 } else if (de != NULL) { 1181 de = TAILQ_NEXT(de, td_entries); 1182 } else { 1183 de = tmpfs_dir_lookupbycookie(node, 1184 off); 1185 KASSERT(de != NULL); 1186 de = TAILQ_NEXT(de, td_entries); 1187 } 1188 if (de == NULL) { 1189 off = TMPFS_DIRCOOKIE_EOF; 1190 } else { 1191 off = tmpfs_dircookie(de); 1192 } 1193 } 1194 1195 (*cookies)[i] = off; 1196 } 1197 KASSERT(uio->uio_offset == off); 1198 } 1199 1200 out: 1201 KASSERT(VOP_ISLOCKED(vp)); 1202 1203 return error; 1204 } 1205 1206 /* --------------------------------------------------------------------- */ 1207 1208 int 1209 tmpfs_readlink(void *v) 1210 { 1211 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1212 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1213 1214 int error; 1215 struct tmpfs_node *node; 1216 1217 KASSERT(VOP_ISLOCKED(vp)); 1218 KASSERT(uio->uio_offset == 0); 1219 KASSERT(vp->v_type == VLNK); 1220 1221 node = VP_TO_TMPFS_NODE(vp); 1222 1223 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1224 MIN(node->tn_size, uio->uio_resid), uio); 1225 node->tn_status |= TMPFS_NODE_ACCESSED; 1226 1227 KASSERT(VOP_ISLOCKED(vp)); 1228 1229 return error; 1230 } 1231 1232 /* --------------------------------------------------------------------- */ 1233 1234 int 1235 tmpfs_inactive(void *v) 1236 { 1237 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1238 1239 struct tmpfs_node *node; 1240 1241 KASSERT(VOP_ISLOCKED(vp)); 1242 1243 node = VP_TO_TMPFS_NODE(vp); 1244 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1245 VOP_UNLOCK(vp, 0); 1246 1247 return 0; 1248 } 1249 1250 /* --------------------------------------------------------------------- */ 1251 1252 int 1253 tmpfs_reclaim(void *v) 1254 { 1255 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1256 1257 struct tmpfs_mount *tmp; 1258 struct tmpfs_node *node; 1259 1260 node = VP_TO_TMPFS_NODE(vp); 1261 tmp = VFS_TO_TMPFS(vp->v_mount); 1262 1263 cache_purge(vp); 1264 tmpfs_free_vp(vp); 1265 1266 /* If the node referenced by this vnode was deleted by the user, 1267 * we must free its associated data structures (now that the vnode 1268 * is being reclaimed). */ 1269 if (node->tn_links == 0) 1270 tmpfs_free_node(tmp, node); 1271 1272 KASSERT(vp->v_data == NULL); 1273 1274 return 0; 1275 } 1276 1277 /* --------------------------------------------------------------------- */ 1278 1279 int 1280 tmpfs_print(void *v) 1281 { 1282 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1283 1284 struct tmpfs_node *node; 1285 1286 node = VP_TO_TMPFS_NODE(vp); 1287 1288 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1289 node, node->tn_flags, node->tn_links); 1290 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1291 ", status 0x%x\n", 1292 node->tn_mode, node->tn_uid, node->tn_gid, 1293 (uintmax_t)node->tn_size, node->tn_status); 1294 if (vp->v_type == VFIFO) 1295 fifo_printinfo(vp); 1296 printf("\n"); 1297 1298 return 0; 1299 } 1300 1301 /* --------------------------------------------------------------------- */ 1302 1303 int 1304 tmpfs_pathconf(void *v) 1305 { 1306 int name = ((struct vop_pathconf_args *)v)->a_name; 1307 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1308 1309 int error; 1310 1311 error = 0; 1312 1313 switch (name) { 1314 case _PC_LINK_MAX: 1315 *retval = LINK_MAX; 1316 break; 1317 1318 case _PC_NAME_MAX: 1319 *retval = NAME_MAX; 1320 break; 1321 1322 case _PC_PATH_MAX: 1323 *retval = PATH_MAX; 1324 break; 1325 1326 case _PC_PIPE_BUF: 1327 *retval = PIPE_BUF; 1328 break; 1329 1330 case _PC_CHOWN_RESTRICTED: 1331 *retval = 1; 1332 break; 1333 1334 case _PC_NO_TRUNC: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_SYNC_IO: 1339 *retval = 1; 1340 break; 1341 1342 case _PC_FILESIZEBITS: 1343 *retval = 0; /* XXX Don't know which value should I return. */ 1344 break; 1345 1346 default: 1347 error = EINVAL; 1348 } 1349 1350 return error; 1351 } 1352 1353 /* --------------------------------------------------------------------- */ 1354 1355 int 1356 tmpfs_advlock(void *v) 1357 { 1358 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1359 1360 struct tmpfs_node *node; 1361 1362 node = VP_TO_TMPFS_NODE(vp); 1363 1364 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1365 } 1366 1367 /* --------------------------------------------------------------------- */ 1368 1369 int 1370 tmpfs_getpages(void *v) 1371 { 1372 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1373 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1374 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1375 int *count = ((struct vop_getpages_args *)v)->a_count; 1376 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1377 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1378 int advice = ((struct vop_getpages_args *)v)->a_advice; 1379 int flags = ((struct vop_getpages_args *)v)->a_flags; 1380 1381 int error; 1382 int i; 1383 struct tmpfs_node *node; 1384 struct uvm_object *uobj; 1385 int npages = *count; 1386 1387 KASSERT(vp->v_type == VREG); 1388 KASSERT(mutex_owned(&vp->v_interlock)); 1389 1390 node = VP_TO_TMPFS_NODE(vp); 1391 uobj = node->tn_spec.tn_reg.tn_aobj; 1392 1393 /* We currently don't rely on PGO_PASTEOF. */ 1394 1395 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1396 if ((flags & PGO_LOCKED) == 0) 1397 mutex_exit(&vp->v_interlock); 1398 return EINVAL; 1399 } 1400 1401 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1402 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1403 } 1404 1405 if ((flags & PGO_LOCKED) != 0) 1406 return EBUSY; 1407 1408 if ((flags & PGO_NOTIMESTAMP) == 0) { 1409 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1410 node->tn_status |= TMPFS_NODE_ACCESSED; 1411 1412 if ((access_type & VM_PROT_WRITE) != 0) 1413 node->tn_status |= TMPFS_NODE_MODIFIED; 1414 } 1415 1416 mutex_exit(&vp->v_interlock); 1417 1418 /* 1419 * Make sure that the array on which we will store the 1420 * gotten pages is clean. Otherwise uao_get (pointed to by 1421 * the pgo_get below) gets confused and does not return the 1422 * appropriate pages. 1423 * 1424 * XXX This shall be revisited when kern/32166 is addressed 1425 * because the loop to clean m[i] will most likely be redundant 1426 * as well as the PGO_ALLPAGES flag. 1427 */ 1428 if (m != NULL) 1429 for (i = 0; i < npages; i++) 1430 m[i] = NULL; 1431 mutex_enter(&uobj->vmobjlock); 1432 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1433 access_type, advice, flags | PGO_ALLPAGES); 1434 #if defined(DEBUG) 1435 { 1436 /* Make sure that all the pages we return are valid. */ 1437 int dbgi; 1438 if (error == 0 && m != NULL) 1439 for (dbgi = 0; dbgi < npages; dbgi++) 1440 KASSERT(m[dbgi] != NULL); 1441 } 1442 #endif 1443 1444 return error; 1445 } 1446 1447 /* --------------------------------------------------------------------- */ 1448 1449 int 1450 tmpfs_putpages(void *v) 1451 { 1452 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1453 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1454 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1455 int flags = ((struct vop_putpages_args *)v)->a_flags; 1456 1457 int error; 1458 struct tmpfs_node *node; 1459 struct uvm_object *uobj; 1460 1461 KASSERT(mutex_owned(&vp->v_interlock)); 1462 1463 node = VP_TO_TMPFS_NODE(vp); 1464 1465 if (vp->v_type != VREG) { 1466 mutex_exit(&vp->v_interlock); 1467 return 0; 1468 } 1469 1470 uobj = node->tn_spec.tn_reg.tn_aobj; 1471 mutex_exit(&vp->v_interlock); 1472 1473 mutex_enter(&uobj->vmobjlock); 1474 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1475 1476 /* XXX mtime */ 1477 1478 return error; 1479 } 1480
Indexes created Tue Sep 30 20:09:53 GMT 2025