tmpfs_vnops.c revision 1.44.2.7
1 /* $NetBSD: tmpfs_vnops.c,v 1.44.2.7 2007/12/22 00:31:15 ad 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * tmpfs vnode interface. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.44.2.7 2007/12/22 00:31:15 ad Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/event.h> 51 #include <sys/malloc.h> 52 #include <sys/namei.h> 53 #include <sys/proc.h> 54 #include <sys/stat.h> 55 #include <sys/uio.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 #include <sys/lockf.h> 59 #include <sys/kauth.h> 60 61 #include <uvm/uvm.h> 62 63 #include <miscfs/fifofs/fifo.h> 64 #include <fs/tmpfs/tmpfs_vnops.h> 65 #include <fs/tmpfs/tmpfs.h> 66 67 /* --------------------------------------------------------------------- */ 68 69 /* 70 * vnode operations vector used for files stored in a tmpfs file system. 71 */ 72 int (**tmpfs_vnodeop_p)(void *); 73 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 74 { &vop_default_desc, vn_default_error }, 75 { &vop_lookup_desc, tmpfs_lookup }, 76 { &vop_create_desc, tmpfs_create }, 77 { &vop_mknod_desc, tmpfs_mknod }, 78 { &vop_open_desc, tmpfs_open }, 79 { &vop_close_desc, tmpfs_close }, 80 { &vop_access_desc, tmpfs_access }, 81 { &vop_getattr_desc, tmpfs_getattr }, 82 { &vop_setattr_desc, tmpfs_setattr }, 83 { &vop_read_desc, tmpfs_read }, 84 { &vop_write_desc, tmpfs_write }, 85 { &vop_ioctl_desc, tmpfs_ioctl }, 86 { &vop_fcntl_desc, tmpfs_fcntl }, 87 { &vop_poll_desc, tmpfs_poll }, 88 { &vop_kqfilter_desc, tmpfs_kqfilter }, 89 { &vop_revoke_desc, tmpfs_revoke }, 90 { &vop_mmap_desc, tmpfs_mmap }, 91 { &vop_fsync_desc, tmpfs_fsync }, 92 { &vop_seek_desc, tmpfs_seek }, 93 { &vop_remove_desc, tmpfs_remove }, 94 { &vop_link_desc, tmpfs_link }, 95 { &vop_rename_desc, tmpfs_rename }, 96 { &vop_mkdir_desc, tmpfs_mkdir }, 97 { &vop_rmdir_desc, tmpfs_rmdir }, 98 { &vop_symlink_desc, tmpfs_symlink }, 99 { &vop_readdir_desc, tmpfs_readdir }, 100 { &vop_readlink_desc, tmpfs_readlink }, 101 { &vop_abortop_desc, tmpfs_abortop }, 102 { &vop_inactive_desc, tmpfs_inactive }, 103 { &vop_reclaim_desc, tmpfs_reclaim }, 104 { &vop_lock_desc, tmpfs_lock }, 105 { &vop_unlock_desc, tmpfs_unlock }, 106 { &vop_bmap_desc, tmpfs_bmap }, 107 { &vop_strategy_desc, tmpfs_strategy }, 108 { &vop_print_desc, tmpfs_print }, 109 { &vop_pathconf_desc, tmpfs_pathconf }, 110 { &vop_islocked_desc, tmpfs_islocked }, 111 { &vop_advlock_desc, tmpfs_advlock }, 112 { &vop_lease_desc, tmpfs_lease }, 113 { &vop_bwrite_desc, tmpfs_bwrite }, 114 { &vop_getpages_desc, tmpfs_getpages }, 115 { &vop_putpages_desc, tmpfs_putpages }, 116 { NULL, NULL } 117 }; 118 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 119 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 120 121 /* --------------------------------------------------------------------- */ 122 123 int 124 tmpfs_lookup(void *v) 125 { 126 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 127 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 128 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 129 130 int error; 131 struct tmpfs_dirent *de; 132 struct tmpfs_node *dnode; 133 134 KASSERT(VOP_ISLOCKED(dvp)); 135 136 dnode = VP_TO_TMPFS_DIR(dvp); 137 *vpp = NULL; 138 139 /* Check accessibility of requested node as a first step. */ 140 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 141 if (error != 0) 142 goto out; 143 144 /* If requesting the last path component on a read-only file system 145 * with a write operation, deny it. */ 146 if ((cnp->cn_flags & ISLASTCN) && 147 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 148 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 149 error = EROFS; 150 goto out; 151 } 152 153 /* Avoid doing a linear scan of the directory if the requested 154 * directory/name couple is already in the cache. */ 155 error = cache_lookup(dvp, vpp, cnp); 156 if (error >= 0) 157 goto out; 158 159 /* We cannot be requesting the parent directory of the root node. */ 160 KASSERT(IMPLIES(dnode->tn_type == VDIR && 161 dnode->tn_spec.tn_dir.tn_parent == dnode, 162 !(cnp->cn_flags & ISDOTDOT))); 163 164 if (cnp->cn_flags & ISDOTDOT) { 165 VOP_UNLOCK(dvp, 0); 166 167 /* Allocate a new vnode on the matching entry. */ 168 error = tmpfs_alloc_vp(dvp->v_mount, 169 dnode->tn_spec.tn_dir.tn_parent, vpp); 170 171 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 172 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 173 VREF(dvp); 174 *vpp = dvp; 175 error = 0; 176 } else { 177 de = tmpfs_dir_lookup(dnode, cnp); 178 if (de == NULL) { 179 /* The entry was not found in the directory. 180 * This is OK iff we are creating or renaming an 181 * entry and are working on the last component of 182 * the path name. */ 183 if ((cnp->cn_flags & ISLASTCN) && 184 (cnp->cn_nameiop == CREATE || \ 185 cnp->cn_nameiop == RENAME)) { 186 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 187 if (error != 0) 188 goto out; 189 190 /* Keep the component name in the buffer for 191 * future uses. */ 192 cnp->cn_flags |= SAVENAME; 193 194 error = EJUSTRETURN; 195 } else 196 error = ENOENT; 197 } else { 198 struct tmpfs_node *tnode; 199 200 /* The entry was found, so get its associated 201 * tmpfs_node. */ 202 tnode = de->td_node; 203 204 /* If we are not at the last path component and 205 * found a non-directory or non-link entry (which 206 * may itself be pointing to a directory), raise 207 * an error. */ 208 if ((tnode->tn_type != VDIR && 209 tnode->tn_type != VLNK) && 210 !(cnp->cn_flags & ISLASTCN)) { 211 error = ENOTDIR; 212 goto out; 213 } 214 215 /* If we are deleting or renaming the entry, keep 216 * track of its tmpfs_dirent so that it can be 217 * easily deleted later. */ 218 if ((cnp->cn_flags & ISLASTCN) && 219 (cnp->cn_nameiop == DELETE || 220 cnp->cn_nameiop == RENAME)) { 221 if ((dnode->tn_mode & S_ISTXT) != 0 && 222 kauth_authorize_generic(cnp->cn_cred, 223 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 224 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 225 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 226 return EPERM; 227 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 228 if (error != 0) 229 goto out; 230 } else 231 de = NULL; 232 233 /* Allocate a new vnode on the matching entry. */ 234 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 235 } 236 } 237 238 /* Store the result of this lookup in the cache. Avoid this if the 239 * request was for creation, as it does not improve timings on 240 * emprical tests. */ 241 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 242 (cnp->cn_flags & ISDOTDOT) == 0) 243 cache_enter(dvp, *vpp, cnp); 244 245 out: 246 /* If there were no errors, *vpp cannot be null and it must be 247 * locked. */ 248 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 249 250 /* dvp must always be locked. */ 251 KASSERT(VOP_ISLOCKED(dvp)); 252 253 return error; 254 } 255 256 /* --------------------------------------------------------------------- */ 257 258 int 259 tmpfs_create(void *v) 260 { 261 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 262 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 263 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 264 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 265 266 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 267 268 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 269 } 270 /* --------------------------------------------------------------------- */ 271 272 int 273 tmpfs_mknod(void *v) 274 { 275 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 276 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 277 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 278 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 279 280 if (vap->va_type != VBLK && vap->va_type != VCHR && 281 vap->va_type != VFIFO) 282 return EINVAL; 283 284 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 285 } 286 287 /* --------------------------------------------------------------------- */ 288 289 int 290 tmpfs_open(void *v) 291 { 292 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 293 int mode = ((struct vop_open_args *)v)->a_mode; 294 295 int error; 296 struct tmpfs_node *node; 297 298 KASSERT(VOP_ISLOCKED(vp)); 299 300 node = VP_TO_TMPFS_NODE(vp); 301 302 /* The file is still active but all its names have been removed 303 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 304 * it is about to die. */ 305 if (node->tn_links < 1) { 306 error = ENOENT; 307 goto out; 308 } 309 310 /* If the file is marked append-only, deny write requests. */ 311 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 312 error = EPERM; 313 else 314 error = 0; 315 316 out: 317 KASSERT(VOP_ISLOCKED(vp)); 318 319 return error; 320 } 321 322 /* --------------------------------------------------------------------- */ 323 324 int 325 tmpfs_close(void *v) 326 { 327 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 328 329 struct tmpfs_node *node; 330 331 KASSERT(VOP_ISLOCKED(vp)); 332 333 node = VP_TO_TMPFS_NODE(vp); 334 335 if (node->tn_links > 0) { 336 /* Update node times. No need to do it if the node has 337 * been deleted, because it will vanish after we return. */ 338 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 339 } 340 341 return 0; 342 } 343 344 /* --------------------------------------------------------------------- */ 345 346 int 347 tmpfs_access(void *v) 348 { 349 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 350 int mode = ((struct vop_access_args *)v)->a_mode; 351 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 352 353 int error; 354 struct tmpfs_node *node; 355 356 KASSERT(VOP_ISLOCKED(vp)); 357 358 node = VP_TO_TMPFS_NODE(vp); 359 360 switch (vp->v_type) { 361 case VDIR: 362 /* FALLTHROUGH */ 363 case VLNK: 364 /* FALLTHROUGH */ 365 case VREG: 366 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 367 error = EROFS; 368 goto out; 369 } 370 break; 371 372 case VBLK: 373 /* FALLTHROUGH */ 374 case VCHR: 375 /* FALLTHROUGH */ 376 case VSOCK: 377 /* FALLTHROUGH */ 378 case VFIFO: 379 break; 380 381 default: 382 error = EINVAL; 383 goto out; 384 } 385 386 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 387 error = EPERM; 388 goto out; 389 } 390 391 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 392 node->tn_gid, mode, cred); 393 394 out: 395 KASSERT(VOP_ISLOCKED(vp)); 396 397 return error; 398 } 399 400 /* --------------------------------------------------------------------- */ 401 402 int 403 tmpfs_getattr(void *v) 404 { 405 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 406 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 407 408 struct tmpfs_node *node; 409 410 node = VP_TO_TMPFS_NODE(vp); 411 412 VATTR_NULL(vap); 413 414 tmpfs_itimes(vp, NULL, NULL); 415 416 vap->va_type = vp->v_type; 417 vap->va_mode = node->tn_mode; 418 vap->va_nlink = node->tn_links; 419 vap->va_uid = node->tn_uid; 420 vap->va_gid = node->tn_gid; 421 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 422 vap->va_fileid = node->tn_id; 423 vap->va_size = node->tn_size; 424 vap->va_blocksize = PAGE_SIZE; 425 vap->va_atime = node->tn_atime; 426 vap->va_mtime = node->tn_mtime; 427 vap->va_ctime = node->tn_ctime; 428 vap->va_birthtime = node->tn_birthtime; 429 vap->va_gen = node->tn_gen; 430 vap->va_flags = node->tn_flags; 431 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 432 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 433 vap->va_bytes = round_page(node->tn_size); 434 vap->va_filerev = VNOVAL; 435 vap->va_vaflags = 0; 436 vap->va_spare = VNOVAL; /* XXX */ 437 438 return 0; 439 } 440 441 /* --------------------------------------------------------------------- */ 442 443 /* XXX Should this operation be atomic? I think it should, but code in 444 * XXX other places (e.g., ufs) doesn't seem to be... */ 445 int 446 tmpfs_setattr(void *v) 447 { 448 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 449 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 450 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 451 struct lwp *l = curlwp; 452 453 int error; 454 455 KASSERT(VOP_ISLOCKED(vp)); 456 457 error = 0; 458 459 /* Abort if any unsettable attribute is given. */ 460 if (vap->va_type != VNON || 461 vap->va_nlink != VNOVAL || 462 vap->va_fsid != VNOVAL || 463 vap->va_fileid != VNOVAL || 464 vap->va_blocksize != VNOVAL || 465 vap->va_ctime.tv_sec != VNOVAL || 466 vap->va_ctime.tv_nsec != VNOVAL || 467 vap->va_birthtime.tv_sec != VNOVAL || 468 vap->va_birthtime.tv_nsec != VNOVAL || 469 vap->va_gen != VNOVAL || 470 vap->va_rdev != VNOVAL || 471 vap->va_bytes != VNOVAL) 472 error = EINVAL; 473 474 if (error == 0 && (vap->va_flags != VNOVAL)) 475 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 476 477 if (error == 0 && (vap->va_size != VNOVAL)) 478 error = tmpfs_chsize(vp, vap->va_size, cred, l); 479 480 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 481 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 482 483 if (error == 0 && (vap->va_mode != VNOVAL)) 484 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 485 486 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 487 vap->va_atime.tv_nsec != VNOVAL) || 488 (vap->va_mtime.tv_sec != VNOVAL && 489 vap->va_mtime.tv_nsec != VNOVAL))) 490 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 491 vap->va_vaflags, cred, l); 492 493 /* Update the node times. We give preference to the error codes 494 * generated by this function rather than the ones that may arise 495 * from tmpfs_update. */ 496 tmpfs_update(vp, NULL, NULL, 0); 497 498 KASSERT(VOP_ISLOCKED(vp)); 499 500 return error; 501 } 502 503 /* --------------------------------------------------------------------- */ 504 505 int 506 tmpfs_read(void *v) 507 { 508 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 509 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 510 511 int error; 512 int flags; 513 struct tmpfs_node *node; 514 struct uvm_object *uobj; 515 516 KASSERT(VOP_ISLOCKED(vp)); 517 518 node = VP_TO_TMPFS_NODE(vp); 519 520 if (vp->v_type != VREG) { 521 error = EISDIR; 522 goto out; 523 } 524 525 if (uio->uio_offset < 0) { 526 error = EINVAL; 527 goto out; 528 } 529 530 node->tn_status |= TMPFS_NODE_ACCESSED; 531 532 uobj = node->tn_spec.tn_reg.tn_aobj; 533 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 534 error = 0; 535 while (error == 0 && uio->uio_resid > 0) { 536 vsize_t len; 537 void *win; 538 539 if (node->tn_size <= uio->uio_offset) 540 break; 541 542 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 543 if (len == 0) 544 break; 545 546 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 547 UBC_READ); 548 error = uiomove(win, len, uio); 549 ubc_release(win, flags); 550 } 551 552 out: 553 KASSERT(VOP_ISLOCKED(vp)); 554 555 return error; 556 } 557 558 /* --------------------------------------------------------------------- */ 559 560 int 561 tmpfs_write(void *v) 562 { 563 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 564 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 565 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 566 567 bool extended; 568 int error; 569 int flags; 570 off_t oldsize; 571 struct tmpfs_node *node; 572 struct uvm_object *uobj; 573 574 KASSERT(VOP_ISLOCKED(vp)); 575 576 node = VP_TO_TMPFS_NODE(vp); 577 oldsize = node->tn_size; 578 579 if (uio->uio_offset < 0 || vp->v_type != VREG) { 580 error = EINVAL; 581 goto out; 582 } 583 584 if (uio->uio_resid == 0) { 585 error = 0; 586 goto out; 587 } 588 589 if (ioflag & IO_APPEND) 590 uio->uio_offset = node->tn_size; 591 592 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 593 if (extended) { 594 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 595 if (error != 0) 596 goto out; 597 } 598 599 uobj = node->tn_spec.tn_reg.tn_aobj; 600 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 601 error = 0; 602 while (error == 0 && uio->uio_resid > 0) { 603 vsize_t len; 604 void *win; 605 606 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 607 if (len == 0) 608 break; 609 610 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 611 UBC_WRITE); 612 error = uiomove(win, len, uio); 613 ubc_release(win, flags); 614 } 615 616 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 617 (extended ? TMPFS_NODE_CHANGED : 0); 618 619 if (error != 0) 620 (void)tmpfs_reg_resize(vp, oldsize); 621 622 VN_KNOTE(vp, NOTE_WRITE); 623 624 out: 625 KASSERT(VOP_ISLOCKED(vp)); 626 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 627 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 628 629 return error; 630 } 631 632 /* --------------------------------------------------------------------- */ 633 634 int 635 tmpfs_fsync(void *v) 636 { 637 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 638 639 KASSERT(VOP_ISLOCKED(vp)); 640 641 tmpfs_update(vp, NULL, NULL, 0); 642 643 return 0; 644 } 645 646 /* --------------------------------------------------------------------- */ 647 648 int 649 tmpfs_remove(void *v) 650 { 651 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 652 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 653 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 654 655 int error; 656 struct tmpfs_dirent *de; 657 struct tmpfs_mount *tmp; 658 struct tmpfs_node *dnode; 659 struct tmpfs_node *node; 660 661 KASSERT(VOP_ISLOCKED(dvp)); 662 KASSERT(VOP_ISLOCKED(vp)); 663 664 if (vp->v_type == VDIR) { 665 error = EPERM; 666 goto out; 667 } 668 669 dnode = VP_TO_TMPFS_DIR(dvp); 670 node = VP_TO_TMPFS_NODE(vp); 671 tmp = VFS_TO_TMPFS(vp->v_mount); 672 de = tmpfs_dir_lookup(dnode, cnp); 673 if (de == NULL) { 674 error = ENOENT; 675 goto out; 676 } 677 KASSERT(de->td_node == node); 678 679 /* Files marked as immutable or append-only cannot be deleted. */ 680 if (node->tn_flags & (IMMUTABLE | APPEND)) { 681 error = EPERM; 682 goto out; 683 } 684 685 /* Remove the entry from the directory; as it is a file, we do not 686 * have to change the number of hard links of the directory. */ 687 tmpfs_dir_detach(dvp, de); 688 689 /* Free the directory entry we just deleted. Note that the node 690 * referred by it will not be removed until the vnode is really 691 * reclaimed. */ 692 tmpfs_free_dirent(tmp, de, true); 693 694 error = 0; 695 696 out: 697 vput(vp); 698 if (dvp == vp) 699 vrele(dvp); 700 else 701 vput(dvp); 702 703 return error; 704 } 705 706 /* --------------------------------------------------------------------- */ 707 708 int 709 tmpfs_link(void *v) 710 { 711 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 712 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 713 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 714 715 int error; 716 struct tmpfs_dirent *de; 717 struct tmpfs_node *dnode; 718 struct tmpfs_node *node; 719 720 KASSERT(VOP_ISLOCKED(dvp)); 721 KASSERT(cnp->cn_flags & HASBUF); 722 KASSERT(dvp != vp); /* XXX When can this be false? */ 723 724 dnode = VP_TO_TMPFS_DIR(dvp); 725 node = VP_TO_TMPFS_NODE(vp); 726 727 /* Lock vp because we will need to run tmpfs_update over it, which 728 * needs the vnode to be locked. */ 729 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 730 if (error != 0) 731 goto out1; 732 733 /* XXX: Why aren't the following two tests done by the caller? */ 734 735 /* Hard links of directories are forbidden. */ 736 if (vp->v_type == VDIR) { 737 error = EPERM; 738 goto out; 739 } 740 741 /* Cannot create cross-device links. */ 742 if (dvp->v_mount != vp->v_mount) { 743 error = EXDEV; 744 goto out; 745 } 746 747 /* Ensure that we do not overflow the maximum number of links imposed 748 * by the system. */ 749 KASSERT(node->tn_links <= LINK_MAX); 750 if (node->tn_links == LINK_MAX) { 751 error = EMLINK; 752 goto out; 753 } 754 755 /* We cannot create links of files marked immutable or append-only. */ 756 if (node->tn_flags & (IMMUTABLE | APPEND)) { 757 error = EPERM; 758 goto out; 759 } 760 761 /* Allocate a new directory entry to represent the node. */ 762 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 763 cnp->cn_nameptr, cnp->cn_namelen, &de); 764 if (error != 0) 765 goto out; 766 767 /* Insert the new directory entry into the appropriate directory. */ 768 tmpfs_dir_attach(dvp, de); 769 770 /* vp link count has changed, so update node times. */ 771 node->tn_status |= TMPFS_NODE_CHANGED; 772 tmpfs_update(vp, NULL, NULL, 0); 773 774 error = 0; 775 776 out: 777 VOP_UNLOCK(vp, 0); 778 out1: 779 PNBUF_PUT(cnp->cn_pnbuf); 780 781 vput(dvp); 782 783 return error; 784 } 785 786 /* --------------------------------------------------------------------- */ 787 788 int 789 tmpfs_rename(void *v) 790 { 791 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 792 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 793 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 794 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 795 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 796 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 797 798 char *newname; 799 int error; 800 struct tmpfs_dirent *de, *de2; 801 struct tmpfs_mount *tmp; 802 struct tmpfs_node *fdnode; 803 struct tmpfs_node *fnode; 804 struct tmpfs_node *tnode; 805 struct tmpfs_node *tdnode; 806 size_t namelen; 807 808 KASSERT(VOP_ISLOCKED(tdvp)); 809 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 810 KASSERT(fcnp->cn_flags & HASBUF); 811 KASSERT(tcnp->cn_flags & HASBUF); 812 813 fnode = VP_TO_TMPFS_NODE(fvp); 814 fdnode = VP_TO_TMPFS_DIR(fdvp); 815 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 816 tdnode = VP_TO_TMPFS_DIR(tdvp); 817 tmp = VFS_TO_TMPFS(tdvp->v_mount); 818 newname = NULL; 819 namelen = 0; 820 821 /* If we need to move the directory between entries, lock the 822 * source so that we can safely operate on it. */ 823 824 /* XXX: this is a potential locking order violation! */ 825 if (fdnode != tdnode) { 826 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 827 if (error != 0) 828 goto out; 829 } 830 831 de = tmpfs_dir_lookup(fdnode, fcnp); 832 if (de == NULL) { 833 error = ENOENT; 834 goto out; 835 } 836 KASSERT(de->td_node == fnode); 837 838 /* Disallow cross-device renames. 839 * XXX Why isn't this done by the caller? */ 840 if (fvp->v_mount != tdvp->v_mount || 841 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 842 error = EXDEV; 843 goto out; 844 } 845 846 /* If source and target are the same file, there is nothing to do. */ 847 if (fvp == tvp) { 848 error = 0; 849 goto out; 850 } 851 852 /* Avoid manipulating '.' and '..' entries. */ 853 if (de == NULL) { 854 KASSERT(fvp->v_type == VDIR); 855 error = EINVAL; 856 goto out; 857 } 858 KASSERT(de->td_node == fnode); 859 860 /* If replacing an existing entry, ensure we can do the operation. */ 861 if (tvp != NULL) { 862 KASSERT(tnode != NULL); 863 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 864 if (tnode->tn_size > 0) { 865 error = ENOTEMPTY; 866 goto out; 867 } 868 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 869 error = ENOTDIR; 870 goto out; 871 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 872 error = EISDIR; 873 goto out; 874 } else { 875 KASSERT(fnode->tn_type != VDIR && 876 tnode->tn_type != VDIR); 877 } 878 } 879 880 /* Ensure that we have enough memory to hold the new name, if it 881 * has to be changed. */ 882 namelen = tcnp->cn_namelen; 883 if (fcnp->cn_namelen != tcnp->cn_namelen || 884 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 885 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 886 if (newname == NULL) { 887 error = ENOSPC; 888 goto out; 889 } 890 } 891 892 /* If the node is being moved to another directory, we have to do 893 * the move. */ 894 if (fdnode != tdnode) { 895 /* In case we are moving a directory, we have to adjust its 896 * parent to point to the new parent. */ 897 if (de->td_node->tn_type == VDIR) { 898 struct tmpfs_node *n; 899 900 /* Ensure the target directory is not a child of the 901 * directory being moved. Otherwise, we'd end up 902 * with stale nodes. */ 903 n = tdnode; 904 while (n != n->tn_spec.tn_dir.tn_parent) { 905 if (n == fnode) { 906 error = EINVAL; 907 goto out; 908 } 909 n = n->tn_spec.tn_dir.tn_parent; 910 } 911 912 /* Adjust the parent pointer. */ 913 TMPFS_VALIDATE_DIR(fnode); 914 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 915 916 /* As a result of changing the target of the '..' 917 * entry, the link count of the source and target 918 * directories has to be adjusted. */ 919 fdnode->tn_links--; 920 tdnode->tn_links++; 921 } 922 923 /* Do the move: just remove the entry from the source directory 924 * and insert it into the target one. */ 925 tmpfs_dir_detach(fdvp, de); 926 tmpfs_dir_attach(tdvp, de); 927 928 /* Notify listeners of fdvp about the change in the directory. 929 * We can do it at this point because we aren't touching fdvp 930 * any more below. */ 931 VN_KNOTE(fdvp, NOTE_WRITE); 932 } 933 934 /* If we are overwriting an entry, we have to remove the old one 935 * from the target directory. */ 936 if (tvp != NULL) { 937 KASSERT(tnode != NULL); 938 939 /* Remove the old entry from the target directory. 940 * Note! This relies on tmpfs_dir_attach() putting the new 941 * node on the end of the target's node list. */ 942 de2 = tmpfs_dir_lookup(tdnode, tcnp); 943 KASSERT(de2 != NULL); 944 /* XXXREMOVEME */ 945 if (de2 == de) { 946 panic("tmpfs_rename: to self 1"); 947 } 948 if (de2->td_node == de->td_node) { 949 panic("tmpfs_rename: to self 2"); 950 } 951 if (de2->td_node != tnode) { 952 panic("tmpfs_rename: found wrong entry [%s]", 953 tcnp->cn_nameptr); 954 } 955 /* XXXREMOVEME */ 956 KASSERT(de2->td_node == tnode); 957 tmpfs_dir_detach(tdvp, de2); 958 959 /* Free the directory entry we just deleted. Note that the 960 * node referred by it will not be removed until the vnode is 961 * really reclaimed. */ 962 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 963 } 964 965 /* If the name has changed, we need to make it effective by changing 966 * it in the directory entry. */ 967 if (newname != NULL) { 968 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 969 KASSERT(tcnp->cn_namelen < 0xffff); 970 971 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 972 de->td_namelen); 973 de->td_namelen = (uint16_t)namelen; 974 memcpy(newname, tcnp->cn_nameptr, namelen); 975 de->td_name = newname; 976 newname = NULL; 977 978 fnode->tn_status |= TMPFS_NODE_CHANGED; 979 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 980 } 981 982 /* Notify listeners of tdvp about the change in the directory (either 983 * because a new entry was added or because one was removed) and 984 * listeners of fvp about the rename. */ 985 VN_KNOTE(tdvp, NOTE_WRITE); 986 VN_KNOTE(fvp, NOTE_RENAME); 987 988 error = 0; 989 990 out: 991 if (fdnode != tdnode) 992 VOP_UNLOCK(fdvp, 0); 993 994 /* Release target nodes. */ 995 if (tdvp == tvp) 996 vrele(tdvp); 997 else 998 vput(tdvp); 999 if (tvp != NULL) 1000 vput(tvp); 1001 1002 /* Release source nodes. */ 1003 vrele(fdvp); 1004 vrele(fvp); 1005 1006 if (newname != NULL) 1007 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 1008 1009 return error; 1010 } 1011 1012 /* --------------------------------------------------------------------- */ 1013 1014 int 1015 tmpfs_mkdir(void *v) 1016 { 1017 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1018 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1019 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1020 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1021 1022 KASSERT(vap->va_type == VDIR); 1023 1024 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1025 } 1026 1027 /* --------------------------------------------------------------------- */ 1028 1029 int 1030 tmpfs_rmdir(void *v) 1031 { 1032 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1033 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1034 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1035 1036 int error; 1037 struct tmpfs_dirent *de; 1038 struct tmpfs_mount *tmp; 1039 struct tmpfs_node *dnode; 1040 struct tmpfs_node *node; 1041 1042 KASSERT(VOP_ISLOCKED(dvp)); 1043 KASSERT(VOP_ISLOCKED(vp)); 1044 1045 tmp = VFS_TO_TMPFS(dvp->v_mount); 1046 dnode = VP_TO_TMPFS_DIR(dvp); 1047 node = VP_TO_TMPFS_DIR(vp); 1048 error = 0; 1049 1050 /* Directories with more than two entries ('.' and '..') cannot be 1051 * removed. */ 1052 if (node->tn_size > 0) { 1053 error = ENOTEMPTY; 1054 goto out; 1055 } 1056 1057 /* This invariant holds only if we are not trying to remove "..". 1058 * We checked for that above so this is safe now. */ 1059 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1060 1061 /* Get the directory entry associated with node (vp). */ 1062 de = tmpfs_dir_lookup(dnode, cnp); 1063 if (de == NULL) { 1064 error = ENOENT; 1065 goto out; 1066 } 1067 KASSERT(de->td_node == node); 1068 1069 /* Check flags to see if we are allowed to remove the directory. */ 1070 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1071 error = EPERM; 1072 goto out; 1073 } 1074 1075 /* Detach the directory entry from the directory (dnode). */ 1076 tmpfs_dir_detach(dvp, de); 1077 1078 node->tn_links--; 1079 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1080 TMPFS_NODE_MODIFIED; 1081 node->tn_spec.tn_dir.tn_parent->tn_links--; 1082 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1083 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1084 1085 /* Release the parent. */ 1086 cache_purge(dvp); /* XXX Is this needed? */ 1087 1088 /* Free the directory entry we just deleted. Note that the node 1089 * referred by it will not be removed until the vnode is really 1090 * reclaimed. */ 1091 tmpfs_free_dirent(tmp, de, true); 1092 1093 KASSERT(node->tn_links == 0); 1094 out: 1095 /* Release the nodes. */ 1096 vput(dvp); 1097 vput(vp); 1098 1099 return error; 1100 } 1101 1102 /* --------------------------------------------------------------------- */ 1103 1104 int 1105 tmpfs_symlink(void *v) 1106 { 1107 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1108 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1109 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1110 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1111 char *target = ((struct vop_symlink_args *)v)->a_target; 1112 1113 KASSERT(vap->va_type == VLNK); 1114 1115 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1116 } 1117 1118 /* --------------------------------------------------------------------- */ 1119 1120 int 1121 tmpfs_readdir(void *v) 1122 { 1123 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1124 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1125 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1126 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1127 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1128 1129 int error; 1130 off_t startoff; 1131 off_t cnt; 1132 struct tmpfs_node *node; 1133 1134 KASSERT(VOP_ISLOCKED(vp)); 1135 1136 /* This operation only makes sense on directory nodes. */ 1137 if (vp->v_type != VDIR) { 1138 error = ENOTDIR; 1139 goto out; 1140 } 1141 1142 node = VP_TO_TMPFS_DIR(vp); 1143 1144 startoff = uio->uio_offset; 1145 1146 cnt = 0; 1147 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1148 error = tmpfs_dir_getdotdent(node, uio); 1149 if (error == -1) { 1150 error = 0; 1151 goto outok; 1152 } else if (error != 0) 1153 goto outok; 1154 cnt++; 1155 } 1156 1157 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1158 error = tmpfs_dir_getdotdotdent(node, uio); 1159 if (error == -1) { 1160 error = 0; 1161 goto outok; 1162 } else if (error != 0) 1163 goto outok; 1164 cnt++; 1165 } 1166 1167 error = tmpfs_dir_getdents(node, uio, &cnt); 1168 if (error == -1) 1169 error = 0; 1170 KASSERT(error >= 0); 1171 1172 outok: 1173 /* This label assumes that startoff has been 1174 * initialized. If the compiler didn't spit out warnings, we'd 1175 * simply make this one be 'out' and drop 'outok'. */ 1176 1177 if (eofflag != NULL) 1178 *eofflag = 1179 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1180 1181 /* Update NFS-related variables. */ 1182 if (error == 0 && cookies != NULL && ncookies != NULL) { 1183 off_t i; 1184 off_t off = startoff; 1185 struct tmpfs_dirent *de = NULL; 1186 1187 *ncookies = cnt; 1188 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1189 1190 for (i = 0; i < cnt; i++) { 1191 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1192 if (off == TMPFS_DIRCOOKIE_DOT) { 1193 off = TMPFS_DIRCOOKIE_DOTDOT; 1194 } else { 1195 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1196 de = TAILQ_FIRST(&node->tn_spec. 1197 tn_dir.tn_dir); 1198 } else if (de != NULL) { 1199 de = TAILQ_NEXT(de, td_entries); 1200 } else { 1201 de = tmpfs_dir_lookupbycookie(node, 1202 off); 1203 KASSERT(de != NULL); 1204 de = TAILQ_NEXT(de, td_entries); 1205 } 1206 if (de == NULL) { 1207 off = TMPFS_DIRCOOKIE_EOF; 1208 } else { 1209 off = tmpfs_dircookie(de); 1210 } 1211 } 1212 1213 (*cookies)[i] = off; 1214 } 1215 KASSERT(uio->uio_offset == off); 1216 } 1217 1218 out: 1219 KASSERT(VOP_ISLOCKED(vp)); 1220 1221 return error; 1222 } 1223 1224 /* --------------------------------------------------------------------- */ 1225 1226 int 1227 tmpfs_readlink(void *v) 1228 { 1229 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1230 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1231 1232 int error; 1233 struct tmpfs_node *node; 1234 1235 KASSERT(VOP_ISLOCKED(vp)); 1236 KASSERT(uio->uio_offset == 0); 1237 KASSERT(vp->v_type == VLNK); 1238 1239 node = VP_TO_TMPFS_NODE(vp); 1240 1241 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1242 MIN(node->tn_size, uio->uio_resid), uio); 1243 node->tn_status |= TMPFS_NODE_ACCESSED; 1244 1245 KASSERT(VOP_ISLOCKED(vp)); 1246 1247 return error; 1248 } 1249 1250 /* --------------------------------------------------------------------- */ 1251 1252 int 1253 tmpfs_inactive(void *v) 1254 { 1255 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1256 1257 struct tmpfs_node *node; 1258 1259 KASSERT(VOP_ISLOCKED(vp)); 1260 1261 node = VP_TO_TMPFS_NODE(vp); 1262 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1263 VOP_UNLOCK(vp, 0); 1264 1265 return 0; 1266 } 1267 1268 /* --------------------------------------------------------------------- */ 1269 1270 int 1271 tmpfs_reclaim(void *v) 1272 { 1273 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1274 1275 struct tmpfs_mount *tmp; 1276 struct tmpfs_node *node; 1277 1278 node = VP_TO_TMPFS_NODE(vp); 1279 tmp = VFS_TO_TMPFS(vp->v_mount); 1280 1281 cache_purge(vp); 1282 tmpfs_free_vp(vp); 1283 1284 /* If the node referenced by this vnode was deleted by the user, 1285 * we must free its associated data structures (now that the vnode 1286 * is being reclaimed). */ 1287 if (node->tn_links == 0) 1288 tmpfs_free_node(tmp, node); 1289 1290 KASSERT(vp->v_data == NULL); 1291 1292 return 0; 1293 } 1294 1295 /* --------------------------------------------------------------------- */ 1296 1297 int 1298 tmpfs_print(void *v) 1299 { 1300 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1301 1302 struct tmpfs_node *node; 1303 1304 node = VP_TO_TMPFS_NODE(vp); 1305 1306 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1307 node, node->tn_flags, node->tn_links); 1308 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1309 ", status 0x%x\n", 1310 node->tn_mode, node->tn_uid, node->tn_gid, 1311 (uintmax_t)node->tn_size, node->tn_status); 1312 1313 if (vp->v_type == VFIFO) 1314 fifo_printinfo(vp); 1315 lockmgr_printinfo(&vp->v_lock); 1316 1317 printf("\n"); 1318 1319 return 0; 1320 } 1321 1322 /* --------------------------------------------------------------------- */ 1323 1324 int 1325 tmpfs_pathconf(void *v) 1326 { 1327 int name = ((struct vop_pathconf_args *)v)->a_name; 1328 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1329 1330 int error; 1331 1332 error = 0; 1333 1334 switch (name) { 1335 case _PC_LINK_MAX: 1336 *retval = LINK_MAX; 1337 break; 1338 1339 case _PC_NAME_MAX: 1340 *retval = NAME_MAX; 1341 break; 1342 1343 case _PC_PATH_MAX: 1344 *retval = PATH_MAX; 1345 break; 1346 1347 case _PC_PIPE_BUF: 1348 *retval = PIPE_BUF; 1349 break; 1350 1351 case _PC_CHOWN_RESTRICTED: 1352 *retval = 1; 1353 break; 1354 1355 case _PC_NO_TRUNC: 1356 *retval = 1; 1357 break; 1358 1359 case _PC_SYNC_IO: 1360 *retval = 1; 1361 break; 1362 1363 case _PC_FILESIZEBITS: 1364 *retval = 0; /* XXX Don't know which value should I return. */ 1365 break; 1366 1367 default: 1368 error = EINVAL; 1369 } 1370 1371 return error; 1372 } 1373 1374 /* --------------------------------------------------------------------- */ 1375 1376 int 1377 tmpfs_advlock(void *v) 1378 { 1379 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1380 1381 struct tmpfs_node *node; 1382 1383 node = VP_TO_TMPFS_NODE(vp); 1384 1385 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1386 } 1387 1388 /* --------------------------------------------------------------------- */ 1389 1390 int 1391 tmpfs_getpages(void *v) 1392 { 1393 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1394 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1395 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1396 int *count = ((struct vop_getpages_args *)v)->a_count; 1397 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1398 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1399 int advice = ((struct vop_getpages_args *)v)->a_advice; 1400 int flags = ((struct vop_getpages_args *)v)->a_flags; 1401 1402 int error; 1403 int i; 1404 struct tmpfs_node *node; 1405 struct uvm_object *uobj; 1406 int npages = *count; 1407 1408 KASSERT(vp->v_type == VREG); 1409 KASSERT(mutex_owned(&vp->v_interlock)); 1410 1411 node = VP_TO_TMPFS_NODE(vp); 1412 uobj = node->tn_spec.tn_reg.tn_aobj; 1413 1414 /* We currently don't rely on PGO_PASTEOF. */ 1415 1416 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1417 if ((flags & PGO_LOCKED) == 0) 1418 mutex_exit(&vp->v_interlock); 1419 return EINVAL; 1420 } 1421 1422 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1423 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1424 } 1425 1426 if ((flags & PGO_LOCKED) != 0) 1427 return EBUSY; 1428 1429 if ((flags & PGO_NOTIMESTAMP) == 0) { 1430 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1431 node->tn_status |= TMPFS_NODE_ACCESSED; 1432 1433 if ((access_type & VM_PROT_WRITE) != 0) 1434 node->tn_status |= TMPFS_NODE_MODIFIED; 1435 } 1436 1437 mutex_exit(&vp->v_interlock); 1438 1439 /* 1440 * Make sure that the array on which we will store the 1441 * gotten pages is clean. Otherwise uao_get (pointed to by 1442 * the pgo_get below) gets confused and does not return the 1443 * appropriate pages. 1444 * 1445 * XXX This shall be revisited when kern/32166 is addressed 1446 * because the loop to clean m[i] will most likely be redundant 1447 * as well as the PGO_ALLPAGES flag. 1448 */ 1449 if (m != NULL) 1450 for (i = 0; i < npages; i++) 1451 m[i] = NULL; 1452 mutex_enter(&uobj->vmobjlock); 1453 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1454 access_type, advice, flags | PGO_ALLPAGES); 1455 #if defined(DEBUG) 1456 { 1457 /* Make sure that all the pages we return are valid. */ 1458 int dbgi; 1459 if (error == 0 && m != NULL) 1460 for (dbgi = 0; dbgi < npages; dbgi++) 1461 KASSERT(m[dbgi] != NULL); 1462 } 1463 #endif 1464 1465 return error; 1466 } 1467 1468 /* --------------------------------------------------------------------- */ 1469 1470 int 1471 tmpfs_putpages(void *v) 1472 { 1473 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1474 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1475 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1476 int flags = ((struct vop_putpages_args *)v)->a_flags; 1477 1478 int error; 1479 struct tmpfs_node *node; 1480 struct uvm_object *uobj; 1481 1482 KASSERT(mutex_owned(&vp->v_interlock)); 1483 1484 node = VP_TO_TMPFS_NODE(vp); 1485 1486 if (vp->v_type != VREG) { 1487 mutex_exit(&vp->v_interlock); 1488 return 0; 1489 } 1490 1491 uobj = node->tn_spec.tn_reg.tn_aobj; 1492 mutex_exit(&vp->v_interlock); 1493 1494 mutex_enter(&uobj->vmobjlock); 1495 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1496 1497 /* XXX mtime */ 1498 1499 return error; 1500 } 1501
Indexes created Tue Sep 30 20:09:53 GMT 2025