tmpfs_vnops.c revision 1.30
1 /* $NetBSD: tmpfs_vnops.c,v 1.30 2006/11/07 14:08:13 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006 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 1.30 2006/11/07 14:08:13 jmmv 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, cnp->cn_lwp); 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 if (cnp->cn_flags & LOCKPARENT && 172 cnp->cn_flags & ISLASTCN) { 173 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 174 cnp->cn_flags |= PDIRUNLOCK; 175 } 176 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 177 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 178 VREF(dvp); 179 *vpp = dvp; 180 dnode->tn_lookup_dirent = NULL; 181 error = 0; 182 } else { 183 de = tmpfs_dir_lookup(dnode, cnp); 184 if (de == NULL) { 185 /* The entry was not found in the directory. 186 * This is OK iff we are creating or renaming an 187 * entry and are working on the last component of 188 * the path name. */ 189 if ((cnp->cn_flags & ISLASTCN) && 190 (cnp->cn_nameiop == CREATE || \ 191 cnp->cn_nameiop == RENAME)) { 192 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 193 cnp->cn_lwp); 194 if (error != 0) 195 goto out; 196 197 /* Keep the component name in the buffer for 198 * future uses. */ 199 cnp->cn_flags |= SAVENAME; 200 201 error = EJUSTRETURN; 202 } else 203 error = ENOENT; 204 } else { 205 struct tmpfs_node *tnode; 206 207 /* The entry was found, so get its associated 208 * tmpfs_node. */ 209 tnode = de->td_node; 210 211 /* If we are not at the last path component and 212 * found a non-directory or non-link entry (which 213 * may itself be pointing to a directory), raise 214 * an error. */ 215 if ((tnode->tn_type != VDIR && 216 tnode->tn_type != VLNK) && 217 !(cnp->cn_flags & ISLASTCN)) { 218 error = ENOTDIR; 219 goto out; 220 } 221 222 /* If we are deleting or renaming the entry, keep 223 * track of its tmpfs_dirent so that it can be 224 * easily deleted later. */ 225 if ((cnp->cn_flags & ISLASTCN) && 226 (cnp->cn_nameiop == DELETE || 227 cnp->cn_nameiop == RENAME)) { 228 if ((dnode->tn_mode & S_ISTXT) != 0 && 229 kauth_cred_geteuid(cnp->cn_cred) != 0 && 230 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 231 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 232 return EPERM; 233 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 234 cnp->cn_lwp); 235 if (error != 0) 236 goto out; 237 tnode->tn_lookup_dirent = de; 238 } 239 240 /* Allocate a new vnode on the matching entry. */ 241 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 242 243 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 244 !(cnp->cn_flags & ISLASTCN))) 245 VOP_UNLOCK(dvp, 0); 246 } 247 } 248 249 /* Store the result of this lookup in the cache. Avoid this if the 250 * request was for creation, as it does not improve timings on 251 * emprical tests. */ 252 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 253 cache_enter(dvp, *vpp, cnp); 254 255 out: 256 /* If there were no errors, *vpp cannot be null and it must be 257 * locked. */ 258 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 259 260 /* dvp has to be locked if: 261 * - There were errors and relocking of dvp did not fail. 262 * - We are doing a '..' lookup, relocking of dvp did not fail 263 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 264 * - LOCKPARENT and ISLASTCN are set. */ 265 KASSERT(IMPLIES( 266 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 267 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 268 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 269 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 270 , 271 VOP_ISLOCKED(dvp))); 272 273 return error; 274 } 275 276 /* --------------------------------------------------------------------- */ 277 278 int 279 tmpfs_create(void *v) 280 { 281 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 282 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 283 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 284 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 285 286 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 287 288 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 289 } 290 /* --------------------------------------------------------------------- */ 291 292 int 293 tmpfs_mknod(void *v) 294 { 295 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 296 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 297 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 298 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 299 300 if (vap->va_type != VBLK && vap->va_type != VCHR && 301 vap->va_type != VFIFO) 302 return EINVAL; 303 304 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 305 } 306 307 /* --------------------------------------------------------------------- */ 308 309 int 310 tmpfs_open(void *v) 311 { 312 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 313 int mode = ((struct vop_open_args *)v)->a_mode; 314 315 int error; 316 struct tmpfs_node *node; 317 318 KASSERT(VOP_ISLOCKED(vp)); 319 320 node = VP_TO_TMPFS_NODE(vp); 321 322 /* If the file is marked append-only, deny write requests. */ 323 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 324 error = EPERM; 325 else 326 error = 0; 327 328 KASSERT(VOP_ISLOCKED(vp)); 329 330 return error; 331 } 332 333 /* --------------------------------------------------------------------- */ 334 335 int 336 tmpfs_close(void *v) 337 { 338 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 339 340 struct tmpfs_node *node; 341 342 KASSERT(VOP_ISLOCKED(vp)); 343 344 node = VP_TO_TMPFS_NODE(vp); 345 346 if (node->tn_links > 0) { 347 /* Update node times. No need to do it if the node has 348 * been deleted, because it will vanish after we return. */ 349 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 350 } 351 352 return 0; 353 } 354 355 /* --------------------------------------------------------------------- */ 356 357 int 358 tmpfs_access(void *v) 359 { 360 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 361 int mode = ((struct vop_access_args *)v)->a_mode; 362 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 363 364 int error; 365 struct tmpfs_node *node; 366 367 KASSERT(VOP_ISLOCKED(vp)); 368 369 node = VP_TO_TMPFS_NODE(vp); 370 371 switch (vp->v_type) { 372 case VDIR: 373 /* FALLTHROUGH */ 374 case VLNK: 375 /* FALLTHROUGH */ 376 case VREG: 377 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 378 error = EROFS; 379 goto out; 380 } 381 break; 382 383 case VBLK: 384 /* FALLTHROUGH */ 385 case VCHR: 386 /* FALLTHROUGH */ 387 case VSOCK: 388 /* FALLTHROUGH */ 389 case VFIFO: 390 break; 391 392 default: 393 error = EINVAL; 394 goto out; 395 } 396 397 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 398 error = EPERM; 399 goto out; 400 } 401 402 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 403 node->tn_gid, mode, cred); 404 405 out: 406 KASSERT(VOP_ISLOCKED(vp)); 407 408 return error; 409 } 410 411 /* --------------------------------------------------------------------- */ 412 413 int 414 tmpfs_getattr(void *v) 415 { 416 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 417 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 418 419 struct tmpfs_node *node; 420 421 node = VP_TO_TMPFS_NODE(vp); 422 423 VATTR_NULL(vap); 424 425 tmpfs_itimes(vp, NULL, NULL); 426 427 vap->va_type = vp->v_type; 428 vap->va_mode = node->tn_mode; 429 vap->va_nlink = node->tn_links; 430 vap->va_uid = node->tn_uid; 431 vap->va_gid = node->tn_gid; 432 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 433 vap->va_fileid = node->tn_id; 434 vap->va_size = node->tn_size; 435 vap->va_blocksize = PAGE_SIZE; 436 vap->va_atime = node->tn_atime; 437 vap->va_mtime = node->tn_mtime; 438 vap->va_ctime = node->tn_ctime; 439 vap->va_birthtime = node->tn_birthtime; 440 vap->va_gen = node->tn_gen; 441 vap->va_flags = node->tn_flags; 442 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 443 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 444 vap->va_bytes = round_page(node->tn_size); 445 vap->va_filerev = VNOVAL; 446 vap->va_vaflags = 0; 447 vap->va_spare = VNOVAL; /* XXX */ 448 449 return 0; 450 } 451 452 /* --------------------------------------------------------------------- */ 453 454 /* XXX Should this operation be atomic? I think it should, but code in 455 * XXX other places (e.g., ufs) doesn't seem to be... */ 456 int 457 tmpfs_setattr(void *v) 458 { 459 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 460 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 461 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 462 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 463 464 int error; 465 466 KASSERT(VOP_ISLOCKED(vp)); 467 468 error = 0; 469 470 /* Abort if any unsettable attribute is given. */ 471 if (vap->va_type != VNON || 472 vap->va_nlink != VNOVAL || 473 vap->va_fsid != VNOVAL || 474 vap->va_fileid != VNOVAL || 475 vap->va_blocksize != VNOVAL || 476 vap->va_ctime.tv_sec != VNOVAL || 477 vap->va_ctime.tv_nsec != VNOVAL || 478 vap->va_birthtime.tv_sec != VNOVAL || 479 vap->va_birthtime.tv_nsec != VNOVAL || 480 vap->va_gen != VNOVAL || 481 vap->va_rdev != VNOVAL || 482 vap->va_bytes != VNOVAL) 483 error = EINVAL; 484 485 if (error == 0 && (vap->va_flags != VNOVAL)) 486 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 487 488 if (error == 0 && (vap->va_size != VNOVAL)) 489 error = tmpfs_chsize(vp, vap->va_size, cred, l); 490 491 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 492 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 493 494 if (error == 0 && (vap->va_mode != VNOVAL)) 495 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 496 497 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 498 vap->va_atime.tv_nsec != VNOVAL) || 499 (vap->va_mtime.tv_sec != VNOVAL && 500 vap->va_mtime.tv_nsec != VNOVAL))) 501 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 502 vap->va_vaflags, cred, l); 503 504 /* Update the node times. We give preference to the error codes 505 * generated by this function rather than the ones that may arise 506 * from tmpfs_update. */ 507 tmpfs_update(vp, NULL, NULL, 0); 508 509 KASSERT(VOP_ISLOCKED(vp)); 510 511 return error; 512 } 513 514 /* --------------------------------------------------------------------- */ 515 516 int 517 tmpfs_read(void *v) 518 { 519 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 520 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 521 522 int error; 523 int flags; 524 struct tmpfs_node *node; 525 struct uvm_object *uobj; 526 527 KASSERT(VOP_ISLOCKED(vp)); 528 529 node = VP_TO_TMPFS_NODE(vp); 530 531 if (vp->v_type != VREG) { 532 error = EISDIR; 533 goto out; 534 } 535 536 if (uio->uio_offset < 0) { 537 error = EINVAL; 538 goto out; 539 } 540 541 node->tn_status |= TMPFS_NODE_ACCESSED; 542 543 uobj = node->tn_spec.tn_reg.tn_aobj; 544 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 545 error = 0; 546 while (error == 0 && uio->uio_resid > 0) { 547 vsize_t len; 548 void *win; 549 550 if (node->tn_size <= uio->uio_offset) 551 break; 552 553 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 554 if (len == 0) 555 break; 556 557 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 558 UBC_READ); 559 error = uiomove(win, len, uio); 560 ubc_release(win, flags); 561 } 562 563 out: 564 KASSERT(VOP_ISLOCKED(vp)); 565 566 return error; 567 } 568 569 /* --------------------------------------------------------------------- */ 570 571 int 572 tmpfs_write(void *v) 573 { 574 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 575 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 576 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 577 578 boolean_t extended; 579 int error; 580 int flags; 581 off_t oldsize; 582 struct tmpfs_node *node; 583 struct uvm_object *uobj; 584 585 KASSERT(VOP_ISLOCKED(vp)); 586 587 node = VP_TO_TMPFS_NODE(vp); 588 oldsize = node->tn_size; 589 590 if (uio->uio_offset < 0 || vp->v_type != VREG) { 591 error = EINVAL; 592 goto out; 593 } 594 595 if (uio->uio_resid == 0) { 596 error = 0; 597 goto out; 598 } 599 600 if (ioflag & IO_APPEND) 601 uio->uio_offset = node->tn_size; 602 603 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 604 if (extended) { 605 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 606 if (error != 0) 607 goto out; 608 } 609 610 uobj = node->tn_spec.tn_reg.tn_aobj; 611 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 612 error = 0; 613 while (error == 0 && uio->uio_resid > 0) { 614 vsize_t len; 615 void *win; 616 617 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 618 if (len == 0) 619 break; 620 621 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 622 UBC_WRITE); 623 error = uiomove(win, len, uio); 624 ubc_release(win, flags); 625 } 626 627 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 628 (extended ? TMPFS_NODE_CHANGED : 0); 629 630 if (error != 0) 631 (void)tmpfs_reg_resize(vp, oldsize); 632 633 out: 634 KASSERT(VOP_ISLOCKED(vp)); 635 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 636 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 637 638 return error; 639 } 640 641 /* --------------------------------------------------------------------- */ 642 643 int 644 tmpfs_fsync(void *v) 645 { 646 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 647 648 KASSERT(VOP_ISLOCKED(vp)); 649 650 tmpfs_update(vp, NULL, NULL, 0); 651 652 return 0; 653 } 654 655 /* --------------------------------------------------------------------- */ 656 657 int 658 tmpfs_remove(void *v) 659 { 660 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 661 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 662 663 int error; 664 struct tmpfs_dirent *de; 665 struct tmpfs_mount *tmp; 666 struct tmpfs_node *dnode; 667 struct tmpfs_node *node; 668 669 KASSERT(VOP_ISLOCKED(dvp)); 670 KASSERT(VOP_ISLOCKED(vp)); 671 672 dnode = VP_TO_TMPFS_DIR(dvp); 673 node = VP_TO_TMPFS_NODE(vp); 674 tmp = VFS_TO_TMPFS(vp->v_mount); 675 de = node->tn_lookup_dirent; 676 KASSERT(de != NULL); 677 678 /* XXX: Why isn't this done by the caller? */ 679 if (vp->v_type == VDIR) { 680 error = EISDIR; 681 goto out; 682 } 683 684 /* Files marked as immutable or append-only cannot be deleted. */ 685 if (node->tn_flags & (IMMUTABLE | APPEND)) { 686 error = EPERM; 687 goto out; 688 } 689 690 /* Remove the entry from the directory; as it is a file, we do not 691 * have to change the number of hard links of the directory. */ 692 tmpfs_dir_detach(dvp, de); 693 694 /* Notify interested parties about the modification of dvp. 695 * The removal of vp is notified when it is reclaimed. */ 696 VN_KNOTE(dvp, NOTE_WRITE); 697 698 /* Free the directory entry we just deleted. Note that the node 699 * referred by it will not be removed until the vnode is really 700 * reclaimed. */ 701 tmpfs_free_dirent(tmp, de, TRUE); 702 703 error = 0; 704 705 out: 706 vput(dvp); 707 vput(vp); 708 709 KASSERT(!VOP_ISLOCKED(dvp)); 710 711 return error; 712 } 713 714 /* --------------------------------------------------------------------- */ 715 716 int 717 tmpfs_link(void *v) 718 { 719 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 720 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 721 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 722 723 int error; 724 struct tmpfs_dirent *de; 725 struct tmpfs_node *dnode; 726 struct tmpfs_node *node; 727 728 KASSERT(VOP_ISLOCKED(dvp)); 729 KASSERT(!VOP_ISLOCKED(vp)); 730 KASSERT(cnp->cn_flags & HASBUF); 731 KASSERT(dvp != vp); /* XXX When can this be false? */ 732 733 dnode = VP_TO_TMPFS_DIR(dvp); 734 node = VP_TO_TMPFS_NODE(vp); 735 736 /* Lock vp because we will need to run tmpfs_update over it, which 737 * needs the vnode to be locked. */ 738 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 739 if (error != 0) 740 goto out; 741 742 /* XXX: Why aren't the following two tests done by the caller? */ 743 744 /* Hard links of directories are forbidden. */ 745 if (vp->v_type == VDIR) { 746 error = EPERM; 747 goto out; 748 } 749 750 /* Cannot create cross-device links. */ 751 if (dvp->v_mount != vp->v_mount) { 752 error = EXDEV; 753 goto out; 754 } 755 756 /* Ensure that we do not overflow the maximum number of links imposed 757 * by the system. */ 758 KASSERT(node->tn_links <= LINK_MAX); 759 if (node->tn_links == LINK_MAX) { 760 error = EMLINK; 761 goto out; 762 } 763 764 /* We cannot create links of files marked immutable or append-only. */ 765 if (node->tn_flags & (IMMUTABLE | APPEND)) { 766 error = EPERM; 767 goto out; 768 } 769 770 /* Allocate a new directory entry to represent the node. */ 771 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 772 cnp->cn_nameptr, cnp->cn_namelen, &de); 773 if (error != 0) 774 goto out; 775 776 /* Insert the new directory entry into the appropriate directory. */ 777 tmpfs_dir_attach(dvp, de); 778 VN_KNOTE(dvp, NOTE_WRITE); 779 780 /* vp link count has changed, so update node times. */ 781 node->tn_status |= TMPFS_NODE_CHANGED; 782 tmpfs_update(vp, NULL, NULL, 0); 783 784 error = 0; 785 786 out: 787 if (VOP_ISLOCKED(vp)) 788 VOP_UNLOCK(vp, 0); 789 790 PNBUF_PUT(cnp->cn_pnbuf); 791 792 vput(dvp); 793 794 /* XXX Locking status of dvp does not match manual page. */ 795 KASSERT(!VOP_ISLOCKED(dvp)); 796 KASSERT(!VOP_ISLOCKED(vp)); 797 798 return error; 799 } 800 801 /* --------------------------------------------------------------------- */ 802 803 int 804 tmpfs_rename(void *v) 805 { 806 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 807 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 808 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 809 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 810 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 811 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 812 813 char *newname; 814 int error; 815 struct tmpfs_dirent *de; 816 struct tmpfs_mount *tmp; 817 struct tmpfs_node *fdnode; 818 struct tmpfs_node *fnode; 819 struct tmpfs_node *tdnode; 820 821 KASSERT(VOP_ISLOCKED(tdvp)); 822 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 823 KASSERT(fcnp->cn_flags & HASBUF); 824 KASSERT(tcnp->cn_flags & HASBUF); 825 826 fdnode = VP_TO_TMPFS_DIR(fdvp); 827 fnode = VP_TO_TMPFS_NODE(fvp); 828 de = fnode->tn_lookup_dirent; 829 830 /* Disallow cross-device renames. 831 * XXX Why isn't this done by the caller? */ 832 if (fvp->v_mount != tdvp->v_mount || 833 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 834 error = EXDEV; 835 goto out; 836 } 837 838 tmp = VFS_TO_TMPFS(tdvp->v_mount); 839 tdnode = VP_TO_TMPFS_DIR(tdvp); 840 841 /* If source and target are the same file, there is nothing to do. */ 842 if (fvp == tvp) { 843 error = 0; 844 goto out; 845 } 846 847 /* Avoid manipulating '.' and '..' entries. */ 848 if (de == NULL) { 849 KASSERT(fvp->v_type == VDIR); 850 error = EINVAL; 851 goto out; 852 } 853 KASSERT(de->td_node == fnode); 854 855 /* If we need to move the directory between entries, lock the 856 * source so that we can safely operate on it. */ 857 if (fdnode != tdnode) { 858 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 859 if (error != 0) 860 goto out; 861 } 862 863 /* Ensure that we have enough memory to hold the new name, if it 864 * has to be changed. */ 865 if (fcnp->cn_namelen != tcnp->cn_namelen || 866 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 867 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 868 tcnp->cn_namelen, 0); 869 if (newname == NULL) { 870 error = ENOSPC; 871 goto out_locked; 872 } 873 } else 874 newname = NULL; 875 876 /* If the node is being moved to another directory, we have to do 877 * the move. */ 878 if (fdnode != tdnode) { 879 /* In case we are moving a directory, we have to adjust its 880 * parent to point to the new parent. */ 881 if (de->td_node->tn_type == VDIR) { 882 struct tmpfs_node *n; 883 884 /* Ensure the target directory is not a child of the 885 * directory being moved. Otherwise, we'd end up 886 * with stale nodes. */ 887 n = tdnode; 888 while (n != n->tn_spec.tn_dir.tn_parent) { 889 if (n == fnode) { 890 error = EINVAL; 891 goto out_locked; 892 } 893 n = n->tn_spec.tn_dir.tn_parent; 894 } 895 896 /* Adjust the parent pointer. */ 897 TMPFS_VALIDATE_DIR(fnode); 898 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 899 900 /* As a result of changing the target of the '..' 901 * entry, the link count of the source and target 902 * directories has to be adjusted. */ 903 fdnode->tn_links--; 904 tdnode->tn_links++; 905 } 906 907 /* Do the move: just remove the entry from the source directory 908 * and insert it into the target one. */ 909 tmpfs_dir_detach(fdvp, de); 910 tmpfs_dir_attach(tdvp, de); 911 912 /* Notify listeners of fdvp about the change in the directory. 913 * We can do it at this point because we aren't touching fdvp 914 * any more below. */ 915 VN_KNOTE(fdvp, NOTE_WRITE); 916 } 917 918 /* If the name has changed, we need to make it effective by changing 919 * it in the directory entry. */ 920 if (newname != NULL) { 921 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 922 KASSERT(tcnp->cn_namelen < 0xffff); 923 924 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 925 de->td_namelen); 926 de->td_namelen = (uint16_t)tcnp->cn_namelen; 927 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 928 de->td_name = newname; 929 930 fnode->tn_status |= TMPFS_NODE_CHANGED; 931 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 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 struct tmpfs_node *tnode; 938 939 tnode = VP_TO_TMPFS_NODE(tvp); 940 941 /* The source node cannot be a directory in this case. */ 942 KASSERT(fnode->tn_type != VDIR); 943 944 /* Remove the old entry from the target directory. */ 945 de = tnode->tn_lookup_dirent; 946 tmpfs_dir_detach(tdvp, de); 947 948 /* Free the directory entry we just deleted. Note that the 949 * node referred by it will not be removed until the vnode is 950 * really reclaimed. */ 951 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 952 } 953 954 /* Notify listeners of tdvp about the change in the directory (either 955 * because a new entry was added or because one was removed). */ 956 VN_KNOTE(tdvp, NOTE_WRITE); 957 958 error = 0; 959 960 out_locked: 961 if (fdnode != tdnode) 962 VOP_UNLOCK(fdvp, 0); 963 964 out: 965 /* Release target nodes. */ 966 /* XXX: I don't understand when tdvp can be the same as tvp, but 967 * other code takes care of this... */ 968 if (tdvp == tvp) 969 vrele(tdvp); 970 else 971 vput(tdvp); 972 if (tvp != NULL) 973 vput(tvp); 974 975 /* Release source nodes. */ 976 vrele(fdvp); 977 vrele(fvp); 978 979 return error; 980 } 981 982 /* --------------------------------------------------------------------- */ 983 984 int 985 tmpfs_mkdir(void *v) 986 { 987 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 988 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 989 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 990 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 991 992 KASSERT(vap->va_type == VDIR); 993 994 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 995 } 996 997 /* --------------------------------------------------------------------- */ 998 999 int 1000 tmpfs_rmdir(void *v) 1001 { 1002 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1003 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1004 1005 int error; 1006 struct tmpfs_dirent *de; 1007 struct tmpfs_mount *tmp; 1008 struct tmpfs_node *dnode; 1009 struct tmpfs_node *node; 1010 1011 KASSERT(VOP_ISLOCKED(dvp)); 1012 KASSERT(VOP_ISLOCKED(vp)); 1013 1014 tmp = VFS_TO_TMPFS(dvp->v_mount); 1015 dnode = VP_TO_TMPFS_DIR(dvp); 1016 node = VP_TO_TMPFS_DIR(vp); 1017 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1018 1019 /* Get the directory entry associated with node (vp). This was 1020 * filled by tmpfs_lookup while looking up the entry. */ 1021 de = node->tn_lookup_dirent; 1022 KASSERT(TMPFS_DIRENT_MATCHES(de, 1023 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1024 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1025 1026 /* Directories with more than two entries ('.' and '..') cannot be 1027 * removed. */ 1028 if (node->tn_size > 0) { 1029 error = ENOTEMPTY; 1030 goto out; 1031 } 1032 1033 /* Check flags to see if we are allowed to remove the directory. */ 1034 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1035 error = EPERM; 1036 goto out; 1037 } 1038 1039 /* Detach the directory entry from the directory (dnode). */ 1040 tmpfs_dir_detach(dvp, de); 1041 1042 node->tn_links--; 1043 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1044 TMPFS_NODE_MODIFIED; 1045 node->tn_spec.tn_dir.tn_parent->tn_links--; 1046 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1047 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1048 1049 /* Notify modification of parent directory and release it. */ 1050 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1051 cache_purge(dvp); /* XXX Is this needed? */ 1052 vput(dvp); 1053 1054 /* Free the directory entry we just deleted. Note that the node 1055 * referred by it will not be removed until the vnode is really 1056 * reclaimed. */ 1057 tmpfs_free_dirent(tmp, de, TRUE); 1058 1059 /* Release the deleted vnode (will destroy the node, notify 1060 * interested parties and clean it from the cache). */ 1061 vput(vp); 1062 1063 error = 0; 1064 1065 out: 1066 if (error != 0) { 1067 vput(dvp); 1068 vput(vp); 1069 } 1070 1071 return error; 1072 } 1073 1074 /* --------------------------------------------------------------------- */ 1075 1076 int 1077 tmpfs_symlink(void *v) 1078 { 1079 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1080 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1081 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1082 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1083 char *target = ((struct vop_symlink_args *)v)->a_target; 1084 1085 KASSERT(vap->va_type == VLNK); 1086 1087 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1088 } 1089 1090 /* --------------------------------------------------------------------- */ 1091 1092 int 1093 tmpfs_readdir(void *v) 1094 { 1095 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1096 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1097 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1098 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1099 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1100 1101 int error; 1102 off_t startoff; 1103 off_t cnt; 1104 struct tmpfs_node *node; 1105 1106 KASSERT(VOP_ISLOCKED(vp)); 1107 1108 /* This operation only makes sense on directory nodes. */ 1109 if (vp->v_type != VDIR) { 1110 error = ENOTDIR; 1111 goto out; 1112 } 1113 1114 node = VP_TO_TMPFS_DIR(vp); 1115 1116 startoff = uio->uio_offset; 1117 1118 cnt = 0; 1119 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1120 error = tmpfs_dir_getdotdent(node, uio); 1121 if (error == -1) { 1122 error = 0; 1123 goto outok; 1124 } else if (error != 0) 1125 goto outok; 1126 cnt++; 1127 } 1128 1129 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1130 error = tmpfs_dir_getdotdotdent(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 error = tmpfs_dir_getdents(node, uio, &cnt); 1140 if (error == -1) 1141 error = 0; 1142 KASSERT(error >= 0); 1143 1144 outok: 1145 /* This label assumes that startoff has been 1146 * initialized. If the compiler didn't spit out warnings, we'd 1147 * simply make this one be 'out' and drop 'outok'. */ 1148 1149 if (eofflag != NULL) 1150 *eofflag = 1151 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1152 1153 /* Update NFS-related variables. */ 1154 if (error == 0 && cookies != NULL && ncookies != NULL) { 1155 off_t i; 1156 off_t off = startoff; 1157 struct tmpfs_dirent *de = NULL; 1158 1159 *ncookies = cnt; 1160 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1161 1162 for (i = 0; i < cnt; i++) { 1163 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1164 if (off == TMPFS_DIRCOOKIE_DOT) { 1165 off = TMPFS_DIRCOOKIE_DOTDOT; 1166 } else { 1167 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1168 de = TAILQ_FIRST(&node->tn_spec. 1169 tn_dir.tn_dir); 1170 } else if (de != NULL) { 1171 de = TAILQ_NEXT(de, td_entries); 1172 } else { 1173 de = tmpfs_dir_lookupbycookie(node, 1174 off); 1175 KASSERT(de != NULL); 1176 de = TAILQ_NEXT(de, td_entries); 1177 } 1178 if (de == NULL) { 1179 off = TMPFS_DIRCOOKIE_EOF; 1180 } else { 1181 off = tmpfs_dircookie(de); 1182 } 1183 } 1184 1185 (*cookies)[i] = off; 1186 } 1187 KASSERT(uio->uio_offset == off); 1188 } 1189 1190 out: 1191 KASSERT(VOP_ISLOCKED(vp)); 1192 1193 return error; 1194 } 1195 1196 /* --------------------------------------------------------------------- */ 1197 1198 int 1199 tmpfs_readlink(void *v) 1200 { 1201 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1202 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1203 1204 int error; 1205 struct tmpfs_node *node; 1206 1207 KASSERT(VOP_ISLOCKED(vp)); 1208 KASSERT(uio->uio_offset == 0); 1209 KASSERT(vp->v_type == VLNK); 1210 1211 node = VP_TO_TMPFS_NODE(vp); 1212 1213 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1214 MIN(node->tn_size, uio->uio_resid), uio); 1215 node->tn_status |= TMPFS_NODE_ACCESSED; 1216 1217 KASSERT(VOP_ISLOCKED(vp)); 1218 1219 return error; 1220 } 1221 1222 /* --------------------------------------------------------------------- */ 1223 1224 int 1225 tmpfs_inactive(void *v) 1226 { 1227 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1228 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1229 1230 struct tmpfs_node *node; 1231 1232 KASSERT(VOP_ISLOCKED(vp)); 1233 1234 node = VP_TO_TMPFS_NODE(vp); 1235 1236 VOP_UNLOCK(vp, 0); 1237 1238 if (node->tn_links == 0) 1239 vrecycle(vp, NULL, l); 1240 1241 return 0; 1242 } 1243 1244 /* --------------------------------------------------------------------- */ 1245 1246 int 1247 tmpfs_reclaim(void *v) 1248 { 1249 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1250 1251 struct tmpfs_mount *tmp; 1252 struct tmpfs_node *node; 1253 1254 KASSERT(!VOP_ISLOCKED(vp)); 1255 1256 node = VP_TO_TMPFS_NODE(vp); 1257 tmp = VFS_TO_TMPFS(vp->v_mount); 1258 1259 if (node->tn_links == 0) 1260 VN_KNOTE(vp, NOTE_DELETE); 1261 1262 cache_purge(vp); 1263 tmpfs_free_vp(vp); 1264 1265 /* If the node referenced by this vnode was deleted by the user, 1266 * we must free its associated data structures (now that the vnode 1267 * is being reclaimed). */ 1268 if (node->tn_links == 0) 1269 tmpfs_free_node(tmp, node); 1270 1271 KASSERT(!VOP_ISLOCKED(vp)); 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 1295 if (vp->v_type == VFIFO) 1296 fifo_printinfo(vp); 1297 lockmgr_printinfo(&vp->v_lock); 1298 1299 printf("\n"); 1300 1301 return 0; 1302 } 1303 1304 /* --------------------------------------------------------------------- */ 1305 1306 int 1307 tmpfs_pathconf(void *v) 1308 { 1309 int name = ((struct vop_pathconf_args *)v)->a_name; 1310 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1311 1312 int error; 1313 1314 error = 0; 1315 1316 switch (name) { 1317 case _PC_LINK_MAX: 1318 *retval = LINK_MAX; 1319 break; 1320 1321 case _PC_NAME_MAX: 1322 *retval = NAME_MAX; 1323 break; 1324 1325 case _PC_PATH_MAX: 1326 *retval = PATH_MAX; 1327 break; 1328 1329 case _PC_PIPE_BUF: 1330 *retval = PIPE_BUF; 1331 break; 1332 1333 case _PC_CHOWN_RESTRICTED: 1334 *retval = 1; 1335 break; 1336 1337 case _PC_NO_TRUNC: 1338 *retval = 1; 1339 break; 1340 1341 case _PC_SYNC_IO: 1342 *retval = 1; 1343 break; 1344 1345 case _PC_FILESIZEBITS: 1346 *retval = 0; /* XXX Don't know which value should I return. */ 1347 break; 1348 1349 default: 1350 error = EINVAL; 1351 } 1352 1353 return error; 1354 } 1355 1356 /* --------------------------------------------------------------------- */ 1357 1358 int 1359 tmpfs_advlock(void *v) 1360 { 1361 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1362 1363 struct tmpfs_node *node; 1364 1365 node = VP_TO_TMPFS_NODE(vp); 1366 1367 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1368 } 1369 1370 /* --------------------------------------------------------------------- */ 1371 1372 int 1373 tmpfs_getpages(void *v) 1374 { 1375 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1376 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1377 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1378 int *count = ((struct vop_getpages_args *)v)->a_count; 1379 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1380 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1381 int advice = ((struct vop_getpages_args *)v)->a_advice; 1382 int flags = ((struct vop_getpages_args *)v)->a_flags; 1383 1384 int error; 1385 int i; 1386 struct tmpfs_node *node; 1387 struct uvm_object *uobj; 1388 int npages = *count; 1389 1390 KASSERT(vp->v_type == VREG); 1391 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1392 1393 node = VP_TO_TMPFS_NODE(vp); 1394 uobj = node->tn_spec.tn_reg.tn_aobj; 1395 1396 /* We currently don't rely on PGO_PASTEOF. */ 1397 1398 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1399 if ((flags & PGO_LOCKED) == 0) 1400 simple_unlock(&vp->v_interlock); 1401 return EINVAL; 1402 } 1403 1404 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1405 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1406 } 1407 1408 if ((flags & PGO_LOCKED) != 0) 1409 return EBUSY; 1410 1411 if ((flags & PGO_NOTIMESTAMP) == 0) { 1412 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1413 node->tn_status |= TMPFS_NODE_ACCESSED; 1414 1415 if ((access_type & VM_PROT_WRITE) != 0) 1416 node->tn_status |= TMPFS_NODE_MODIFIED; 1417 } 1418 1419 simple_unlock(&vp->v_interlock); 1420 1421 /* 1422 * Make sure that the array on which we will store the 1423 * gotten pages is clean. Otherwise uao_get (pointed to by 1424 * the pgo_get below) gets confused and does not return the 1425 * appropriate pages. 1426 * 1427 * XXX This shall be revisited when kern/32166 is addressed 1428 * because the loop to clean m[i] will most likely be redundant 1429 * as well as the PGO_ALLPAGES flag. 1430 */ 1431 if (m != NULL) 1432 for (i = 0; i < npages; i++) 1433 m[i] = NULL; 1434 simple_lock(&uobj->vmobjlock); 1435 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1436 access_type, advice, flags | PGO_ALLPAGES); 1437 #if defined(DEBUG) 1438 { 1439 /* Make sure that all the pages we return are valid. */ 1440 int dbgi; 1441 if (error == 0 && m != NULL) 1442 for (dbgi = 0; dbgi < npages; dbgi++) 1443 KASSERT(m[dbgi] != NULL); 1444 } 1445 #endif 1446 1447 return error; 1448 } 1449 1450 /* --------------------------------------------------------------------- */ 1451 1452 int 1453 tmpfs_putpages(void *v) 1454 { 1455 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1456 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1457 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1458 int flags = ((struct vop_putpages_args *)v)->a_flags; 1459 1460 int error; 1461 struct tmpfs_node *node; 1462 struct uvm_object *uobj; 1463 1464 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1465 1466 node = VP_TO_TMPFS_NODE(vp); 1467 1468 if (vp->v_type != VREG) { 1469 simple_unlock(&vp->v_interlock); 1470 return 0; 1471 } 1472 1473 uobj = node->tn_spec.tn_reg.tn_aobj; 1474 simple_unlock(&vp->v_interlock); 1475 1476 simple_lock(&uobj->vmobjlock); 1477 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1478 1479 /* XXX mtime */ 1480 1481 return error; 1482 } 1483
Indexes created Tue Sep 30 20:09:53 GMT 2025