tmpfs_vnops.c revision 1.32.2.1
1 /* $NetBSD: tmpfs_vnops.c,v 1.32.2.1 2007/01/04 20:29:50 bouyer 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 1.32.2.1 2007/01/04 20:29:50 bouyer 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 /* The file is still active but all its names have been removed 323 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 324 * it is about to die. */ 325 if (node->tn_links < 1) { 326 error = ENOENT; 327 goto out; 328 } 329 330 /* If the file is marked append-only, deny write requests. */ 331 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 332 error = EPERM; 333 else 334 error = 0; 335 336 out: 337 KASSERT(VOP_ISLOCKED(vp)); 338 339 return error; 340 } 341 342 /* --------------------------------------------------------------------- */ 343 344 int 345 tmpfs_close(void *v) 346 { 347 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 348 349 struct tmpfs_node *node; 350 351 KASSERT(VOP_ISLOCKED(vp)); 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 if (node->tn_links > 0) { 356 /* Update node times. No need to do it if the node has 357 * been deleted, because it will vanish after we return. */ 358 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 359 } 360 361 return 0; 362 } 363 364 /* --------------------------------------------------------------------- */ 365 366 int 367 tmpfs_access(void *v) 368 { 369 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 370 int mode = ((struct vop_access_args *)v)->a_mode; 371 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 372 373 int error; 374 struct tmpfs_node *node; 375 376 KASSERT(VOP_ISLOCKED(vp)); 377 378 node = VP_TO_TMPFS_NODE(vp); 379 380 switch (vp->v_type) { 381 case VDIR: 382 /* FALLTHROUGH */ 383 case VLNK: 384 /* FALLTHROUGH */ 385 case VREG: 386 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 387 error = EROFS; 388 goto out; 389 } 390 break; 391 392 case VBLK: 393 /* FALLTHROUGH */ 394 case VCHR: 395 /* FALLTHROUGH */ 396 case VSOCK: 397 /* FALLTHROUGH */ 398 case VFIFO: 399 break; 400 401 default: 402 error = EINVAL; 403 goto out; 404 } 405 406 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 407 error = EPERM; 408 goto out; 409 } 410 411 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 412 node->tn_gid, mode, cred); 413 414 out: 415 KASSERT(VOP_ISLOCKED(vp)); 416 417 return error; 418 } 419 420 /* --------------------------------------------------------------------- */ 421 422 int 423 tmpfs_getattr(void *v) 424 { 425 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 426 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 427 428 struct tmpfs_node *node; 429 430 node = VP_TO_TMPFS_NODE(vp); 431 432 VATTR_NULL(vap); 433 434 tmpfs_itimes(vp, NULL, NULL); 435 436 vap->va_type = vp->v_type; 437 vap->va_mode = node->tn_mode; 438 vap->va_nlink = node->tn_links; 439 vap->va_uid = node->tn_uid; 440 vap->va_gid = node->tn_gid; 441 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 442 vap->va_fileid = node->tn_id; 443 vap->va_size = node->tn_size; 444 vap->va_blocksize = PAGE_SIZE; 445 vap->va_atime = node->tn_atime; 446 vap->va_mtime = node->tn_mtime; 447 vap->va_ctime = node->tn_ctime; 448 vap->va_birthtime = node->tn_birthtime; 449 vap->va_gen = node->tn_gen; 450 vap->va_flags = node->tn_flags; 451 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 452 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 453 vap->va_bytes = round_page(node->tn_size); 454 vap->va_filerev = VNOVAL; 455 vap->va_vaflags = 0; 456 vap->va_spare = VNOVAL; /* XXX */ 457 458 return 0; 459 } 460 461 /* --------------------------------------------------------------------- */ 462 463 /* XXX Should this operation be atomic? I think it should, but code in 464 * XXX other places (e.g., ufs) doesn't seem to be... */ 465 int 466 tmpfs_setattr(void *v) 467 { 468 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 469 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 470 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 471 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 472 473 int error; 474 475 KASSERT(VOP_ISLOCKED(vp)); 476 477 error = 0; 478 479 /* Abort if any unsettable attribute is given. */ 480 if (vap->va_type != VNON || 481 vap->va_nlink != VNOVAL || 482 vap->va_fsid != VNOVAL || 483 vap->va_fileid != VNOVAL || 484 vap->va_blocksize != VNOVAL || 485 vap->va_ctime.tv_sec != VNOVAL || 486 vap->va_ctime.tv_nsec != VNOVAL || 487 vap->va_birthtime.tv_sec != VNOVAL || 488 vap->va_birthtime.tv_nsec != VNOVAL || 489 vap->va_gen != VNOVAL || 490 vap->va_rdev != VNOVAL || 491 vap->va_bytes != VNOVAL) 492 error = EINVAL; 493 494 if (error == 0 && (vap->va_flags != VNOVAL)) 495 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 496 497 if (error == 0 && (vap->va_size != VNOVAL)) 498 error = tmpfs_chsize(vp, vap->va_size, cred, l); 499 500 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 501 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 502 503 if (error == 0 && (vap->va_mode != VNOVAL)) 504 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 505 506 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 507 vap->va_atime.tv_nsec != VNOVAL) || 508 (vap->va_mtime.tv_sec != VNOVAL && 509 vap->va_mtime.tv_nsec != VNOVAL))) 510 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 511 vap->va_vaflags, cred, l); 512 513 /* Update the node times. We give preference to the error codes 514 * generated by this function rather than the ones that may arise 515 * from tmpfs_update. */ 516 tmpfs_update(vp, NULL, NULL, 0); 517 518 KASSERT(VOP_ISLOCKED(vp)); 519 520 return error; 521 } 522 523 /* --------------------------------------------------------------------- */ 524 525 int 526 tmpfs_read(void *v) 527 { 528 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 529 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 530 531 int error; 532 int flags; 533 struct tmpfs_node *node; 534 struct uvm_object *uobj; 535 536 KASSERT(VOP_ISLOCKED(vp)); 537 538 node = VP_TO_TMPFS_NODE(vp); 539 540 if (vp->v_type != VREG) { 541 error = EISDIR; 542 goto out; 543 } 544 545 if (uio->uio_offset < 0) { 546 error = EINVAL; 547 goto out; 548 } 549 550 node->tn_status |= TMPFS_NODE_ACCESSED; 551 552 uobj = node->tn_spec.tn_reg.tn_aobj; 553 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 554 error = 0; 555 while (error == 0 && uio->uio_resid > 0) { 556 vsize_t len; 557 void *win; 558 559 if (node->tn_size <= uio->uio_offset) 560 break; 561 562 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 563 if (len == 0) 564 break; 565 566 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 567 UBC_READ); 568 error = uiomove(win, len, uio); 569 ubc_release(win, flags); 570 } 571 572 out: 573 KASSERT(VOP_ISLOCKED(vp)); 574 575 return error; 576 } 577 578 /* --------------------------------------------------------------------- */ 579 580 int 581 tmpfs_write(void *v) 582 { 583 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 584 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 585 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 586 587 boolean_t extended; 588 int error; 589 int flags; 590 off_t oldsize; 591 struct tmpfs_node *node; 592 struct uvm_object *uobj; 593 594 KASSERT(VOP_ISLOCKED(vp)); 595 596 node = VP_TO_TMPFS_NODE(vp); 597 oldsize = node->tn_size; 598 599 if (uio->uio_offset < 0 || vp->v_type != VREG) { 600 error = EINVAL; 601 goto out; 602 } 603 604 if (uio->uio_resid == 0) { 605 error = 0; 606 goto out; 607 } 608 609 if (ioflag & IO_APPEND) 610 uio->uio_offset = node->tn_size; 611 612 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 613 if (extended) { 614 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 615 if (error != 0) 616 goto out; 617 } 618 619 uobj = node->tn_spec.tn_reg.tn_aobj; 620 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 621 error = 0; 622 while (error == 0 && uio->uio_resid > 0) { 623 vsize_t len; 624 void *win; 625 626 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 627 if (len == 0) 628 break; 629 630 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 631 UBC_WRITE); 632 error = uiomove(win, len, uio); 633 ubc_release(win, flags); 634 } 635 636 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 637 (extended ? TMPFS_NODE_CHANGED : 0); 638 639 if (error != 0) 640 (void)tmpfs_reg_resize(vp, oldsize); 641 642 VN_KNOTE(vp, NOTE_WRITE); 643 644 out: 645 KASSERT(VOP_ISLOCKED(vp)); 646 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 647 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 648 649 return error; 650 } 651 652 /* --------------------------------------------------------------------- */ 653 654 int 655 tmpfs_fsync(void *v) 656 { 657 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 658 659 KASSERT(VOP_ISLOCKED(vp)); 660 661 tmpfs_update(vp, NULL, NULL, 0); 662 663 return 0; 664 } 665 666 /* --------------------------------------------------------------------- */ 667 668 int 669 tmpfs_remove(void *v) 670 { 671 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 672 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 673 674 int error; 675 struct tmpfs_dirent *de; 676 struct tmpfs_mount *tmp; 677 struct tmpfs_node *dnode; 678 struct tmpfs_node *node; 679 680 KASSERT(VOP_ISLOCKED(dvp)); 681 KASSERT(VOP_ISLOCKED(vp)); 682 683 if (vp->v_type == VDIR) { 684 error = EPERM; 685 goto out; 686 } 687 688 dnode = VP_TO_TMPFS_DIR(dvp); 689 node = VP_TO_TMPFS_NODE(vp); 690 tmp = VFS_TO_TMPFS(vp->v_mount); 691 de = node->tn_lookup_dirent; 692 KASSERT(de != NULL); 693 694 /* Files marked as immutable or append-only cannot be deleted. */ 695 if (node->tn_flags & (IMMUTABLE | APPEND)) { 696 error = EPERM; 697 goto out; 698 } 699 700 /* Remove the entry from the directory; as it is a file, we do not 701 * have to change the number of hard links of the directory. */ 702 tmpfs_dir_detach(dvp, de); 703 704 /* Free the directory entry we just deleted. Note that the node 705 * referred by it will not be removed until the vnode is really 706 * reclaimed. */ 707 tmpfs_free_dirent(tmp, de, TRUE); 708 709 error = 0; 710 711 out: 712 vput(vp); 713 if (dvp == vp) 714 vrele(dvp); 715 else 716 vput(dvp); 717 718 KASSERT(!VOP_ISLOCKED(dvp)); 719 720 return error; 721 } 722 723 /* --------------------------------------------------------------------- */ 724 725 int 726 tmpfs_link(void *v) 727 { 728 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 729 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 730 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 731 732 int error; 733 struct tmpfs_dirent *de; 734 struct tmpfs_node *dnode; 735 struct tmpfs_node *node; 736 737 KASSERT(VOP_ISLOCKED(dvp)); 738 KASSERT(!VOP_ISLOCKED(vp)); 739 KASSERT(cnp->cn_flags & HASBUF); 740 KASSERT(dvp != vp); /* XXX When can this be false? */ 741 742 dnode = VP_TO_TMPFS_DIR(dvp); 743 node = VP_TO_TMPFS_NODE(vp); 744 745 /* Lock vp because we will need to run tmpfs_update over it, which 746 * needs the vnode to be locked. */ 747 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 748 if (error != 0) 749 goto out; 750 751 /* XXX: Why aren't the following two tests done by the caller? */ 752 753 /* Hard links of directories are forbidden. */ 754 if (vp->v_type == VDIR) { 755 error = EPERM; 756 goto out; 757 } 758 759 /* Cannot create cross-device links. */ 760 if (dvp->v_mount != vp->v_mount) { 761 error = EXDEV; 762 goto out; 763 } 764 765 /* Ensure that we do not overflow the maximum number of links imposed 766 * by the system. */ 767 KASSERT(node->tn_links <= LINK_MAX); 768 if (node->tn_links == LINK_MAX) { 769 error = EMLINK; 770 goto out; 771 } 772 773 /* We cannot create links of files marked immutable or append-only. */ 774 if (node->tn_flags & (IMMUTABLE | APPEND)) { 775 error = EPERM; 776 goto out; 777 } 778 779 /* Allocate a new directory entry to represent the node. */ 780 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 781 cnp->cn_nameptr, cnp->cn_namelen, &de); 782 if (error != 0) 783 goto out; 784 785 /* Insert the new directory entry into the appropriate directory. */ 786 tmpfs_dir_attach(dvp, de); 787 788 /* vp link count has changed, so update node times. */ 789 node->tn_status |= TMPFS_NODE_CHANGED; 790 tmpfs_update(vp, NULL, NULL, 0); 791 792 error = 0; 793 794 out: 795 if (VOP_ISLOCKED(vp)) 796 VOP_UNLOCK(vp, 0); 797 798 PNBUF_PUT(cnp->cn_pnbuf); 799 800 vput(dvp); 801 802 /* XXX Locking status of dvp does not match manual page. */ 803 KASSERT(!VOP_ISLOCKED(dvp)); 804 KASSERT(!VOP_ISLOCKED(vp)); 805 806 return error; 807 } 808 809 /* --------------------------------------------------------------------- */ 810 811 int 812 tmpfs_rename(void *v) 813 { 814 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 815 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 816 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 817 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 818 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 819 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 820 821 char *newname; 822 int error; 823 struct tmpfs_dirent *de; 824 struct tmpfs_mount *tmp; 825 struct tmpfs_node *fdnode; 826 struct tmpfs_node *fnode; 827 struct tmpfs_node *tdnode; 828 829 KASSERT(VOP_ISLOCKED(tdvp)); 830 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 831 KASSERT(fcnp->cn_flags & HASBUF); 832 KASSERT(tcnp->cn_flags & HASBUF); 833 834 fdnode = VP_TO_TMPFS_DIR(fdvp); 835 fnode = VP_TO_TMPFS_NODE(fvp); 836 de = fnode->tn_lookup_dirent; 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 tmp = VFS_TO_TMPFS(tdvp->v_mount); 847 tdnode = VP_TO_TMPFS_DIR(tdvp); 848 849 /* If source and target are the same file, there is nothing to do. */ 850 if (fvp == tvp) { 851 error = 0; 852 goto out; 853 } 854 855 /* Avoid manipulating '.' and '..' entries. */ 856 if (de == NULL) { 857 KASSERT(fvp->v_type == VDIR); 858 error = EINVAL; 859 goto out; 860 } 861 KASSERT(de->td_node == fnode); 862 863 /* If we need to move the directory between entries, lock the 864 * source so that we can safely operate on it. */ 865 if (fdnode != tdnode) { 866 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 867 if (error != 0) 868 goto out; 869 } 870 871 /* Ensure that we have enough memory to hold the new name, if it 872 * has to be changed. */ 873 if (fcnp->cn_namelen != tcnp->cn_namelen || 874 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 875 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 876 tcnp->cn_namelen, 0); 877 if (newname == NULL) { 878 error = ENOSPC; 879 goto out_locked; 880 } 881 } else 882 newname = NULL; 883 884 /* If the node is being moved to another directory, we have to do 885 * the move. */ 886 if (fdnode != tdnode) { 887 /* In case we are moving a directory, we have to adjust its 888 * parent to point to the new parent. */ 889 if (de->td_node->tn_type == VDIR) { 890 struct tmpfs_node *n; 891 892 /* Ensure the target directory is not a child of the 893 * directory being moved. Otherwise, we'd end up 894 * with stale nodes. */ 895 n = tdnode; 896 while (n != n->tn_spec.tn_dir.tn_parent) { 897 if (n == fnode) { 898 error = EINVAL; 899 goto out_locked; 900 } 901 n = n->tn_spec.tn_dir.tn_parent; 902 } 903 904 /* Adjust the parent pointer. */ 905 TMPFS_VALIDATE_DIR(fnode); 906 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 907 908 /* As a result of changing the target of the '..' 909 * entry, the link count of the source and target 910 * directories has to be adjusted. */ 911 fdnode->tn_links--; 912 tdnode->tn_links++; 913 } 914 915 /* Do the move: just remove the entry from the source directory 916 * and insert it into the target one. */ 917 tmpfs_dir_detach(fdvp, de); 918 tmpfs_dir_attach(tdvp, de); 919 920 /* Notify listeners of fdvp about the change in the directory. 921 * We can do it at this point because we aren't touching fdvp 922 * any more below. */ 923 VN_KNOTE(fdvp, NOTE_WRITE); 924 } 925 926 /* If the name has changed, we need to make it effective by changing 927 * it in the directory entry. */ 928 if (newname != NULL) { 929 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 930 KASSERT(tcnp->cn_namelen < 0xffff); 931 932 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 933 de->td_namelen); 934 de->td_namelen = (uint16_t)tcnp->cn_namelen; 935 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 936 de->td_name = newname; 937 938 fnode->tn_status |= TMPFS_NODE_CHANGED; 939 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 940 } 941 942 /* If we are overwriting an entry, we have to remove the old one 943 * from the target directory. */ 944 if (tvp != NULL) { 945 struct tmpfs_node *tnode; 946 947 tnode = VP_TO_TMPFS_NODE(tvp); 948 949 /* The source node cannot be a directory in this case. */ 950 KASSERT(fnode->tn_type != VDIR); 951 952 /* Remove the old entry from the target directory. */ 953 de = tnode->tn_lookup_dirent; 954 tmpfs_dir_detach(tdvp, de); 955 956 /* Free the directory entry we just deleted. Note that the 957 * node referred by it will not be removed until the vnode is 958 * really reclaimed. */ 959 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 960 } 961 962 /* Notify listeners of tdvp about the change in the directory (either 963 * because a new entry was added or because one was removed) and 964 * listeners of fvp about the rename. */ 965 VN_KNOTE(tdvp, NOTE_WRITE); 966 VN_KNOTE(fvp, NOTE_RENAME); 967 968 error = 0; 969 970 out_locked: 971 if (fdnode != tdnode) 972 VOP_UNLOCK(fdvp, 0); 973 974 out: 975 /* Release target nodes. */ 976 /* XXX: I don't understand when tdvp can be the same as tvp, but 977 * other code takes care of this... */ 978 if (tdvp == tvp) 979 vrele(tdvp); 980 else 981 vput(tdvp); 982 if (tvp != NULL) 983 vput(tvp); 984 985 /* Release source nodes. */ 986 vrele(fdvp); 987 vrele(fvp); 988 989 return error; 990 } 991 992 /* --------------------------------------------------------------------- */ 993 994 int 995 tmpfs_mkdir(void *v) 996 { 997 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 998 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 999 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1000 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1001 1002 KASSERT(vap->va_type == VDIR); 1003 1004 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1005 } 1006 1007 /* --------------------------------------------------------------------- */ 1008 1009 int 1010 tmpfs_rmdir(void *v) 1011 { 1012 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1013 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1014 1015 int error; 1016 struct tmpfs_dirent *de; 1017 struct tmpfs_mount *tmp; 1018 struct tmpfs_node *dnode; 1019 struct tmpfs_node *node; 1020 1021 KASSERT(VOP_ISLOCKED(dvp)); 1022 KASSERT(VOP_ISLOCKED(vp)); 1023 1024 tmp = VFS_TO_TMPFS(dvp->v_mount); 1025 dnode = VP_TO_TMPFS_DIR(dvp); 1026 node = VP_TO_TMPFS_DIR(vp); 1027 1028 /* Directories with more than two entries ('.' and '..') cannot be 1029 * removed. */ 1030 if (node->tn_size > 0) { 1031 error = ENOTEMPTY; 1032 goto out; 1033 } 1034 1035 /* This invariant holds only if we are not trying to remove "..". 1036 * We checked for that above so this is safe now. */ 1037 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1038 1039 /* Get the directory entry associated with node (vp). This was 1040 * filled by tmpfs_lookup while looking up the entry. */ 1041 de = node->tn_lookup_dirent; 1042 KASSERT(TMPFS_DIRENT_MATCHES(de, 1043 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1044 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1045 1046 /* Check flags to see if we are allowed to remove the directory. */ 1047 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1048 error = EPERM; 1049 goto out; 1050 } 1051 1052 /* Detach the directory entry from the directory (dnode). */ 1053 tmpfs_dir_detach(dvp, de); 1054 1055 node->tn_links--; 1056 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1057 TMPFS_NODE_MODIFIED; 1058 node->tn_spec.tn_dir.tn_parent->tn_links--; 1059 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1060 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1061 1062 /* Release the parent. */ 1063 cache_purge(dvp); /* XXX Is this needed? */ 1064 vput(dvp); 1065 1066 /* Free the directory entry we just deleted. Note that the node 1067 * referred by it will not be removed until the vnode is really 1068 * reclaimed. */ 1069 tmpfs_free_dirent(tmp, de, TRUE); 1070 1071 /* Release the deleted vnode (will destroy the node, notify 1072 * interested parties and clean it from the cache). */ 1073 vput(vp); 1074 1075 error = 0; 1076 1077 out: 1078 if (error != 0) { 1079 vput(dvp); 1080 vput(vp); 1081 } 1082 1083 return error; 1084 } 1085 1086 /* --------------------------------------------------------------------- */ 1087 1088 int 1089 tmpfs_symlink(void *v) 1090 { 1091 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1092 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1093 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1094 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1095 char *target = ((struct vop_symlink_args *)v)->a_target; 1096 1097 KASSERT(vap->va_type == VLNK); 1098 1099 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1100 } 1101 1102 /* --------------------------------------------------------------------- */ 1103 1104 int 1105 tmpfs_readdir(void *v) 1106 { 1107 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1108 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1109 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1110 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1111 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1112 1113 int error; 1114 off_t startoff; 1115 off_t cnt; 1116 struct tmpfs_node *node; 1117 1118 KASSERT(VOP_ISLOCKED(vp)); 1119 1120 /* This operation only makes sense on directory nodes. */ 1121 if (vp->v_type != VDIR) { 1122 error = ENOTDIR; 1123 goto out; 1124 } 1125 1126 node = VP_TO_TMPFS_DIR(vp); 1127 1128 startoff = uio->uio_offset; 1129 1130 cnt = 0; 1131 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1132 error = tmpfs_dir_getdotdent(node, uio); 1133 if (error == -1) { 1134 error = 0; 1135 goto outok; 1136 } else if (error != 0) 1137 goto outok; 1138 cnt++; 1139 } 1140 1141 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1142 error = tmpfs_dir_getdotdotdent(node, uio); 1143 if (error == -1) { 1144 error = 0; 1145 goto outok; 1146 } else if (error != 0) 1147 goto outok; 1148 cnt++; 1149 } 1150 1151 error = tmpfs_dir_getdents(node, uio, &cnt); 1152 if (error == -1) 1153 error = 0; 1154 KASSERT(error >= 0); 1155 1156 outok: 1157 /* This label assumes that startoff has been 1158 * initialized. If the compiler didn't spit out warnings, we'd 1159 * simply make this one be 'out' and drop 'outok'. */ 1160 1161 if (eofflag != NULL) 1162 *eofflag = 1163 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1164 1165 /* Update NFS-related variables. */ 1166 if (error == 0 && cookies != NULL && ncookies != NULL) { 1167 off_t i; 1168 off_t off = startoff; 1169 struct tmpfs_dirent *de = NULL; 1170 1171 *ncookies = cnt; 1172 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1173 1174 for (i = 0; i < cnt; i++) { 1175 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1176 if (off == TMPFS_DIRCOOKIE_DOT) { 1177 off = TMPFS_DIRCOOKIE_DOTDOT; 1178 } else { 1179 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1180 de = TAILQ_FIRST(&node->tn_spec. 1181 tn_dir.tn_dir); 1182 } else if (de != NULL) { 1183 de = TAILQ_NEXT(de, td_entries); 1184 } else { 1185 de = tmpfs_dir_lookupbycookie(node, 1186 off); 1187 KASSERT(de != NULL); 1188 de = TAILQ_NEXT(de, td_entries); 1189 } 1190 if (de == NULL) { 1191 off = TMPFS_DIRCOOKIE_EOF; 1192 } else { 1193 off = tmpfs_dircookie(de); 1194 } 1195 } 1196 1197 (*cookies)[i] = off; 1198 } 1199 KASSERT(uio->uio_offset == off); 1200 } 1201 1202 out: 1203 KASSERT(VOP_ISLOCKED(vp)); 1204 1205 return error; 1206 } 1207 1208 /* --------------------------------------------------------------------- */ 1209 1210 int 1211 tmpfs_readlink(void *v) 1212 { 1213 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1214 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1215 1216 int error; 1217 struct tmpfs_node *node; 1218 1219 KASSERT(VOP_ISLOCKED(vp)); 1220 KASSERT(uio->uio_offset == 0); 1221 KASSERT(vp->v_type == VLNK); 1222 1223 node = VP_TO_TMPFS_NODE(vp); 1224 1225 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1226 MIN(node->tn_size, uio->uio_resid), uio); 1227 node->tn_status |= TMPFS_NODE_ACCESSED; 1228 1229 KASSERT(VOP_ISLOCKED(vp)); 1230 1231 return error; 1232 } 1233 1234 /* --------------------------------------------------------------------- */ 1235 1236 int 1237 tmpfs_inactive(void *v) 1238 { 1239 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1240 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1241 1242 struct tmpfs_node *node; 1243 1244 KASSERT(VOP_ISLOCKED(vp)); 1245 1246 node = VP_TO_TMPFS_NODE(vp); 1247 1248 VOP_UNLOCK(vp, 0); 1249 1250 if (node->tn_links == 0) 1251 vrecycle(vp, NULL, l); 1252 1253 return 0; 1254 } 1255 1256 /* --------------------------------------------------------------------- */ 1257 1258 int 1259 tmpfs_reclaim(void *v) 1260 { 1261 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1262 1263 struct tmpfs_mount *tmp; 1264 struct tmpfs_node *node; 1265 1266 KASSERT(!VOP_ISLOCKED(vp)); 1267 1268 node = VP_TO_TMPFS_NODE(vp); 1269 tmp = VFS_TO_TMPFS(vp->v_mount); 1270 1271 cache_purge(vp); 1272 tmpfs_free_vp(vp); 1273 1274 /* If the node referenced by this vnode was deleted by the user, 1275 * we must free its associated data structures (now that the vnode 1276 * is being reclaimed). */ 1277 if (node->tn_links == 0) 1278 tmpfs_free_node(tmp, node); 1279 1280 KASSERT(!VOP_ISLOCKED(vp)); 1281 KASSERT(vp->v_data == NULL); 1282 1283 return 0; 1284 } 1285 1286 /* --------------------------------------------------------------------- */ 1287 1288 int 1289 tmpfs_print(void *v) 1290 { 1291 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1292 1293 struct tmpfs_node *node; 1294 1295 node = VP_TO_TMPFS_NODE(vp); 1296 1297 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1298 node, node->tn_flags, node->tn_links); 1299 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1300 ", status 0x%x\n", 1301 node->tn_mode, node->tn_uid, node->tn_gid, 1302 (uintmax_t)node->tn_size, node->tn_status); 1303 1304 if (vp->v_type == VFIFO) 1305 fifo_printinfo(vp); 1306 lockmgr_printinfo(&vp->v_lock); 1307 1308 printf("\n"); 1309 1310 return 0; 1311 } 1312 1313 /* --------------------------------------------------------------------- */ 1314 1315 int 1316 tmpfs_pathconf(void *v) 1317 { 1318 int name = ((struct vop_pathconf_args *)v)->a_name; 1319 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1320 1321 int error; 1322 1323 error = 0; 1324 1325 switch (name) { 1326 case _PC_LINK_MAX: 1327 *retval = LINK_MAX; 1328 break; 1329 1330 case _PC_NAME_MAX: 1331 *retval = NAME_MAX; 1332 break; 1333 1334 case _PC_PATH_MAX: 1335 *retval = PATH_MAX; 1336 break; 1337 1338 case _PC_PIPE_BUF: 1339 *retval = PIPE_BUF; 1340 break; 1341 1342 case _PC_CHOWN_RESTRICTED: 1343 *retval = 1; 1344 break; 1345 1346 case _PC_NO_TRUNC: 1347 *retval = 1; 1348 break; 1349 1350 case _PC_SYNC_IO: 1351 *retval = 1; 1352 break; 1353 1354 case _PC_FILESIZEBITS: 1355 *retval = 0; /* XXX Don't know which value should I return. */ 1356 break; 1357 1358 default: 1359 error = EINVAL; 1360 } 1361 1362 return error; 1363 } 1364 1365 /* --------------------------------------------------------------------- */ 1366 1367 int 1368 tmpfs_advlock(void *v) 1369 { 1370 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1371 1372 struct tmpfs_node *node; 1373 1374 node = VP_TO_TMPFS_NODE(vp); 1375 1376 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1377 } 1378 1379 /* --------------------------------------------------------------------- */ 1380 1381 int 1382 tmpfs_getpages(void *v) 1383 { 1384 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1385 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1386 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1387 int *count = ((struct vop_getpages_args *)v)->a_count; 1388 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1389 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1390 int advice = ((struct vop_getpages_args *)v)->a_advice; 1391 int flags = ((struct vop_getpages_args *)v)->a_flags; 1392 1393 int error; 1394 int i; 1395 struct tmpfs_node *node; 1396 struct uvm_object *uobj; 1397 int npages = *count; 1398 1399 KASSERT(vp->v_type == VREG); 1400 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1401 1402 node = VP_TO_TMPFS_NODE(vp); 1403 uobj = node->tn_spec.tn_reg.tn_aobj; 1404 1405 /* We currently don't rely on PGO_PASTEOF. */ 1406 1407 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1408 if ((flags & PGO_LOCKED) == 0) 1409 simple_unlock(&vp->v_interlock); 1410 return EINVAL; 1411 } 1412 1413 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1414 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1415 } 1416 1417 if ((flags & PGO_LOCKED) != 0) 1418 return EBUSY; 1419 1420 if ((flags & PGO_NOTIMESTAMP) == 0) { 1421 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1422 node->tn_status |= TMPFS_NODE_ACCESSED; 1423 1424 if ((access_type & VM_PROT_WRITE) != 0) 1425 node->tn_status |= TMPFS_NODE_MODIFIED; 1426 } 1427 1428 simple_unlock(&vp->v_interlock); 1429 1430 /* 1431 * Make sure that the array on which we will store the 1432 * gotten pages is clean. Otherwise uao_get (pointed to by 1433 * the pgo_get below) gets confused and does not return the 1434 * appropriate pages. 1435 * 1436 * XXX This shall be revisited when kern/32166 is addressed 1437 * because the loop to clean m[i] will most likely be redundant 1438 * as well as the PGO_ALLPAGES flag. 1439 */ 1440 if (m != NULL) 1441 for (i = 0; i < npages; i++) 1442 m[i] = NULL; 1443 simple_lock(&uobj->vmobjlock); 1444 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1445 access_type, advice, flags | PGO_ALLPAGES); 1446 #if defined(DEBUG) 1447 { 1448 /* Make sure that all the pages we return are valid. */ 1449 int dbgi; 1450 if (error == 0 && m != NULL) 1451 for (dbgi = 0; dbgi < npages; dbgi++) 1452 KASSERT(m[dbgi] != NULL); 1453 } 1454 #endif 1455 1456 return error; 1457 } 1458 1459 /* --------------------------------------------------------------------- */ 1460 1461 int 1462 tmpfs_putpages(void *v) 1463 { 1464 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1465 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1466 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1467 int flags = ((struct vop_putpages_args *)v)->a_flags; 1468 1469 int error; 1470 struct tmpfs_node *node; 1471 struct uvm_object *uobj; 1472 1473 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1474 1475 node = VP_TO_TMPFS_NODE(vp); 1476 1477 if (vp->v_type != VREG) { 1478 simple_unlock(&vp->v_interlock); 1479 return 0; 1480 } 1481 1482 uobj = node->tn_spec.tn_reg.tn_aobj; 1483 simple_unlock(&vp->v_interlock); 1484 1485 simple_lock(&uobj->vmobjlock); 1486 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1487 1488 /* XXX mtime */ 1489 1490 return error; 1491 } 1492
Indexes created Tue Sep 30 20:09:53 GMT 2025