tmpfs_vnops.c revision 1.1
1 /* $NetBSD: tmpfs_vnops.c,v 1.1 2005/09/10 19:20:51 jmmv Exp $ */ 2 3 /* 4 * Copyright (c) 2005 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * tmpfs vnode interface. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.1 2005/09/10 19:20:51 jmmv Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/dirent.h> 48 #include <sys/fcntl.h> 49 #include <sys/event.h> 50 #include <sys/malloc.h> 51 #include <sys/namei.h> 52 #include <sys/proc.h> 53 #include <sys/stat.h> 54 #include <sys/uio.h> 55 #include <sys/unistd.h> 56 #include <sys/vnode.h> 57 58 #include <uvm/uvm.h> 59 60 #include <miscfs/fifofs/fifo.h> 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 /* --------------------------------------------------------------------- */ 65 66 /* 67 * vnode operations vector used for files stored in a tmpfs file-system. 68 */ 69 int (**tmpfs_vnodeop_p)(void *); 70 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 71 { &vop_default_desc, vn_default_error }, 72 { &vop_lookup_desc, tmpfs_lookup }, 73 { &vop_create_desc, tmpfs_create }, 74 { &vop_mknod_desc, tmpfs_mknod }, 75 { &vop_open_desc, tmpfs_open }, 76 { &vop_close_desc, tmpfs_close }, 77 { &vop_access_desc, tmpfs_access }, 78 { &vop_getattr_desc, tmpfs_getattr }, 79 { &vop_setattr_desc, tmpfs_setattr }, 80 { &vop_read_desc, tmpfs_read }, 81 { &vop_write_desc, tmpfs_write }, 82 { &vop_ioctl_desc, tmpfs_ioctl }, 83 { &vop_fcntl_desc, tmpfs_fcntl }, 84 { &vop_poll_desc, tmpfs_poll }, 85 { &vop_kqfilter_desc, tmpfs_kqfilter }, 86 { &vop_revoke_desc, tmpfs_revoke }, 87 { &vop_mmap_desc, tmpfs_mmap }, 88 { &vop_fsync_desc, tmpfs_fsync }, 89 { &vop_seek_desc, tmpfs_seek }, 90 { &vop_remove_desc, tmpfs_remove }, 91 { &vop_link_desc, tmpfs_link }, 92 { &vop_rename_desc, tmpfs_rename }, 93 { &vop_mkdir_desc, tmpfs_mkdir }, 94 { &vop_rmdir_desc, tmpfs_rmdir }, 95 { &vop_symlink_desc, tmpfs_symlink }, 96 { &vop_readdir_desc, tmpfs_readdir }, 97 { &vop_readlink_desc, tmpfs_readlink }, 98 { &vop_abortop_desc, tmpfs_abortop }, 99 { &vop_inactive_desc, tmpfs_inactive }, 100 { &vop_reclaim_desc, tmpfs_reclaim }, 101 { &vop_lock_desc, tmpfs_lock }, 102 { &vop_unlock_desc, tmpfs_unlock }, 103 { &vop_bmap_desc, tmpfs_bmap }, 104 { &vop_strategy_desc, tmpfs_strategy }, 105 { &vop_print_desc, tmpfs_print }, 106 { &vop_pathconf_desc, tmpfs_pathconf }, 107 { &vop_islocked_desc, tmpfs_islocked }, 108 { &vop_advlock_desc, tmpfs_advlock }, 109 { &vop_blkatoff_desc, tmpfs_blkatoff }, 110 { &vop_valloc_desc, tmpfs_valloc }, 111 { &vop_reallocblks_desc, tmpfs_reallocblks }, 112 { &vop_vfree_desc, tmpfs_vfree }, 113 { &vop_truncate_desc, tmpfs_truncate }, 114 { &vop_update_desc, tmpfs_update }, 115 { &vop_lease_desc, tmpfs_lease }, 116 { &vop_bwrite_desc, tmpfs_bwrite }, 117 { &vop_getpages_desc, tmpfs_getpages }, 118 { &vop_putpages_desc, tmpfs_putpages }, 119 { NULL, NULL } 120 }; 121 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 122 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 123 124 /* --------------------------------------------------------------------- */ 125 126 int 127 tmpfs_lookup(void *v) 128 { 129 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 130 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 131 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 132 133 int error; 134 struct tmpfs_dirent *de; 135 struct tmpfs_node *dnode; 136 137 KASSERT(VOP_ISLOCKED(dvp)); 138 139 dnode = VP_TO_TMPFS_DIR(dvp); 140 *vpp = NULL; 141 142 /* Check accessibility of requested node as a first step. */ 143 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc); 144 if (error != 0) 145 goto out; 146 147 /* If requesting the last path component on a read-only file-system 148 * with a write operation, deny it. */ 149 if ((cnp->cn_flags & ISLASTCN) && 150 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 151 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 152 error = EROFS; 153 goto out; 154 } 155 156 /* Avoid doing a linear scan of the directory if the requested 157 * directory/name couple is already in the cache. */ 158 error = cache_lookup(dvp, vpp, cnp); 159 if (error >= 0) 160 goto out; 161 162 /* We cannot be requesting the parent directory of the root node. */ 163 KASSERT(IMPLIES(dnode->tn_type == VDIR && 164 dnode->tn_parent == dnode, !(cnp->cn_flags & ISDOTDOT))); 165 166 if (cnp->cn_flags & ISDOTDOT) { 167 VOP_UNLOCK(dvp, 0); 168 169 /* Allocate a new vnode on the matching entry. */ 170 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_parent, vpp); 171 172 if (cnp->cn_flags & LOCKPARENT && 173 cnp->cn_flags & ISLASTCN) { 174 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 175 cnp->cn_flags |= PDIRUNLOCK; 176 } 177 dnode->tn_parent->tn_lookup_dirent = NULL; 178 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 179 VREF(dvp); 180 *vpp = dvp; 181 dnode->tn_lookup_dirent = NULL; 182 error = 0; 183 } else { 184 de = tmpfs_dir_lookup(dnode, cnp); 185 if (de == NULL) { 186 /* The entry was not found in the directory. 187 * This is OK iff we are creating or renaming an 188 * entry and are working on the last component of 189 * the path name. */ 190 if ((cnp->cn_flags & ISLASTCN) && 191 (cnp->cn_nameiop == CREATE || \ 192 cnp->cn_nameiop == RENAME)) { 193 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 194 cnp->cn_proc); 195 if (error != 0) 196 goto out; 197 198 /* Keep the component name in the buffer for 199 * future uses. */ 200 cnp->cn_flags |= SAVENAME; 201 202 error = EJUSTRETURN; 203 } else 204 error = ENOENT; 205 } else { 206 struct tmpfs_node *tnode; 207 208 /* The entry was found, so get its associated 209 * tmpfs_node. */ 210 tnode = de->td_node; 211 212 /* If we are not at the last path component and 213 * found a non-directory entry, raise an error. */ 214 if ((tnode->tn_type != VDIR) && 215 !(cnp->cn_flags & ISLASTCN)) { 216 error = ENOTDIR; 217 goto out; 218 } 219 220 /* If we are deleting or renaming the entry, keep 221 * track of its tmpfs_dirent so that it can be 222 * easily deleted later. */ 223 if ((cnp->cn_flags & ISLASTCN) && 224 (cnp->cn_nameiop == DELETE || 225 cnp->cn_nameiop == RENAME)) { 226 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 227 cnp->cn_proc); 228 if (error != 0) 229 goto out; 230 /* TODO: Check sticky bit. */ 231 tnode->tn_lookup_dirent = de; 232 } 233 234 /* Allocate a new vnode on the matching entry. */ 235 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 236 237 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 238 !(cnp->cn_flags & ISLASTCN))) 239 VOP_UNLOCK(dvp, 0); 240 } 241 } 242 243 /* Store the result of this lookup in the cache. Avoid this if the 244 * request was for creation, as it does not improve timings on 245 * emprical tests. */ 246 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 247 cache_enter(dvp, *vpp, cnp); 248 249 out: 250 /* If there were no errors, *vpp cannot be null and it must be 251 * locked. */ 252 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 253 254 /* dvp has to be locked if: 255 * - There were errors and relocking of dvp did not fail. 256 * - We are doing a '..' lookup, relocking of dvp did not fail 257 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 258 * - LOCKPARENT and ISLASTCN are set. */ 259 KASSERT(IMPLIES( 260 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 261 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 262 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 263 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 264 , 265 VOP_ISLOCKED(dvp))); 266 267 return error; 268 } 269 270 /* --------------------------------------------------------------------- */ 271 272 int 273 tmpfs_create(void *v) 274 { 275 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 276 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 277 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 278 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 279 280 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 281 282 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 283 } 284 /* --------------------------------------------------------------------- */ 285 286 int 287 tmpfs_mknod(void *v) 288 { 289 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 290 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 291 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 292 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 293 294 if (vap->va_type != VBLK && vap->va_type != VCHR && 295 vap->va_type != VFIFO) 296 return EINVAL; 297 298 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 299 } 300 301 /* --------------------------------------------------------------------- */ 302 303 int 304 tmpfs_open(void *v) 305 { 306 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 307 int mode = ((struct vop_open_args *)v)->a_mode; 308 309 int error; 310 struct tmpfs_node *node; 311 312 KASSERT(VOP_ISLOCKED(vp)); 313 314 node = VP_TO_TMPFS_NODE(vp); 315 KASSERT(node->tn_links > 0); 316 317 /* If the file is marked append-only, deny write requests. */ 318 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 319 error = EPERM; 320 else 321 error = 0; 322 323 KASSERT(VOP_ISLOCKED(vp)); 324 325 return error; 326 } 327 328 /* --------------------------------------------------------------------- */ 329 330 int 331 tmpfs_close(void *v) 332 { 333 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 334 335 int error; 336 struct tmpfs_node *node; 337 338 KASSERT(VOP_ISLOCKED(vp)); 339 340 node = VP_TO_TMPFS_NODE(vp); 341 342 if (node->tn_links > 0) { 343 /* Update node times. No need to do it if the node has 344 * been deleted, because it will vanish after we return. */ 345 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_CLOSE); 346 } else 347 error = 0; 348 349 return error; 350 } 351 352 /* --------------------------------------------------------------------- */ 353 354 int 355 tmpfs_access(void *v) 356 { 357 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 358 int mode = ((struct vop_access_args *)v)->a_mode; 359 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 360 361 int error; 362 struct tmpfs_node *node; 363 364 KASSERT(VOP_ISLOCKED(vp)); 365 366 node = VP_TO_TMPFS_NODE(vp); 367 368 switch (vp->v_type) { 369 case VDIR: 370 /* FALLTHROUGH */ 371 case VLNK: 372 /* FALLTHROUGH */ 373 case VREG: 374 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 375 error = EROFS; 376 goto out; 377 } 378 break; 379 380 case VBLK: 381 /* FALLTHROUGH */ 382 case VCHR: 383 /* FALLTHROUGH */ 384 case VSOCK: 385 /* FALLTHROUGH */ 386 case VFIFO: 387 break; 388 389 default: 390 error = EINVAL; 391 goto out; 392 } 393 394 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 395 error = EPERM; 396 goto out; 397 } 398 399 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 400 node->tn_gid, mode, cred); 401 402 out: 403 KASSERT(VOP_ISLOCKED(vp)); 404 405 return error; 406 } 407 408 /* --------------------------------------------------------------------- */ 409 410 int 411 tmpfs_getattr(void *v) 412 { 413 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 414 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 415 416 struct tmpfs_node *node; 417 418 node = VP_TO_TMPFS_NODE(vp); 419 420 VATTR_NULL(vap); 421 422 vap->va_type = vp->v_type; 423 vap->va_mode = node->tn_mode; 424 vap->va_nlink = node->tn_links; 425 vap->va_uid = node->tn_uid; 426 vap->va_gid = node->tn_gid; 427 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 428 vap->va_fileid = node->tn_id; 429 vap->va_size = node->tn_size; 430 vap->va_blocksize = PAGE_SIZE; 431 vap->va_atime = node->tn_atime; 432 vap->va_mtime = node->tn_mtime; 433 vap->va_ctime = node->tn_ctime; 434 vap->va_birthtime = node->tn_birthtime; 435 vap->va_gen = node->tn_gen; 436 vap->va_flags = node->tn_flags; 437 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 438 node->tn_rdev : VNOVAL; 439 vap->va_bytes = round_page(node->tn_size); 440 vap->va_filerev = VNOVAL; 441 vap->va_vaflags = 0; 442 vap->va_spare = VNOVAL; /* XXX */ 443 444 return 0; 445 } 446 447 /* --------------------------------------------------------------------- */ 448 449 /* XXX Should this operation be atomic? I think it should, but code in 450 * XXX other places (e.g., ufs) doesn't seem to be... */ 451 int 452 tmpfs_setattr(void *v) 453 { 454 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 455 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 456 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 457 struct proc *p = ((struct vop_setattr_args *)v)->a_p; 458 459 int error, error2; 460 461 KASSERT(VOP_ISLOCKED(vp)); 462 463 error = 0; 464 465 /* Abort if any unsettable attribute is given. */ 466 if (vap->va_type != VNON || 467 vap->va_nlink != VNOVAL || 468 vap->va_fsid != VNOVAL || 469 vap->va_fileid != VNOVAL || 470 vap->va_blocksize != VNOVAL || 471 vap->va_ctime.tv_sec != VNOVAL || 472 vap->va_ctime.tv_nsec != VNOVAL || 473 vap->va_birthtime.tv_sec != VNOVAL || 474 vap->va_birthtime.tv_nsec != VNOVAL || 475 vap->va_gen != VNOVAL || 476 vap->va_rdev != VNOVAL || 477 vap->va_bytes != VNOVAL) 478 error = EINVAL; 479 480 if (error == 0 && (vap->va_flags != VNOVAL)) 481 error = tmpfs_chflags(vp, vap->va_flags, cred, p); 482 483 if (error == 0 && (vap->va_size != VNOVAL)) 484 error = tmpfs_chsize(vp, vap->va_size, cred, p); 485 486 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 487 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 488 489 if (error == 0 && (vap->va_mode != VNOVAL)) 490 error = tmpfs_chmod(vp, vap->va_mode, cred, p); 491 492 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 493 vap->va_atime.tv_nsec != VNOVAL) || 494 (vap->va_mtime.tv_sec != VNOVAL && 495 vap->va_mtime.tv_nsec != VNOVAL))) 496 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 497 vap->va_vaflags, cred, p); 498 499 /* Update the node times. We give preference to the error codes 500 * generated by this function rather than the ones that may arise 501 * from tmpfs_update. */ 502 error2 = VOP_UPDATE(vp, NULL, NULL, 0); 503 if (error == 0) 504 error = error2; 505 506 KASSERT(VOP_ISLOCKED(vp)); 507 508 return error; 509 } 510 511 /* --------------------------------------------------------------------- */ 512 513 int 514 tmpfs_read(void *v) 515 { 516 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 517 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 518 519 int error; 520 off_t len; 521 struct tmpfs_node *node; 522 523 KASSERT(VOP_ISLOCKED(vp)); 524 525 node = VP_TO_TMPFS_NODE(vp); 526 527 if (uio->uio_offset < 0 || vp->v_type != VREG) { 528 error = EINVAL; 529 goto out; 530 } 531 532 node->tn_status |= TMPFS_NODE_ACCESSED; 533 534 if (uio->uio_resid == 0 || 535 uio->uio_offset >= node->tn_size) { 536 error = 0; 537 goto out; 538 } 539 540 /* XXX Is it correct to do the uiomove directly over our aobj or 541 * should we do it through the vnode? */ 542 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 543 error = uiomove((void *)(node->tn_va + (vaddr_t)uio->uio_offset), len, 544 uio); 545 546 out: 547 KASSERT(VOP_ISLOCKED(vp)); 548 549 return error; 550 } 551 552 /* --------------------------------------------------------------------- */ 553 554 int 555 tmpfs_write(void *v) 556 { 557 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 558 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 559 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 560 561 boolean_t extended; 562 int error; 563 off_t oldsize; 564 struct tmpfs_node *node; 565 566 KASSERT(VOP_ISLOCKED(vp)); 567 568 node = VP_TO_TMPFS_NODE(vp); 569 oldsize = node->tn_size; 570 571 if (uio->uio_offset < 0 || vp->v_type != VREG) { 572 error = EINVAL; 573 goto out; 574 } 575 576 if (uio->uio_resid == 0) { 577 error = 0; 578 goto out; 579 } 580 581 if (ioflag & IO_APPEND) 582 uio->uio_offset = node->tn_size; 583 584 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 585 if (extended) { 586 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 587 if (error != 0) 588 goto out; 589 } 590 591 /* XXX Is it correct to do the uiomove directly over our aobj or 592 * should we do it through the vnode? */ 593 error = uiomove((void *)(node->tn_va + (vaddr_t)uio->uio_offset), 594 uio->uio_resid, uio); 595 if (error == 0) { 596 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 597 } else if (extended) { 598 error = tmpfs_reg_resize(vp, oldsize); 599 KASSERT(error == 0); 600 } 601 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 602 (extended ? TMPFS_NODE_CHANGED : 0); 603 604 out: 605 KASSERT(VOP_ISLOCKED(vp)); 606 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 607 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 608 609 return error; 610 } 611 612 /* --------------------------------------------------------------------- */ 613 614 int 615 tmpfs_fsync(void *v) 616 { 617 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 618 619 KASSERT(VOP_ISLOCKED(vp)); 620 621 return VOP_UPDATE(vp, NULL, NULL, 0); 622 } 623 624 /* --------------------------------------------------------------------- */ 625 626 int 627 tmpfs_remove(void *v) 628 { 629 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 630 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 631 632 int error; 633 struct tmpfs_dirent *de; 634 struct tmpfs_mount *tmp; 635 struct tmpfs_node *dnode; 636 struct tmpfs_node *node; 637 638 KASSERT(VOP_ISLOCKED(dvp)); 639 KASSERT(VOP_ISLOCKED(vp)); 640 641 dnode = VP_TO_TMPFS_DIR(dvp); 642 node = VP_TO_TMPFS_NODE(vp); 643 tmp = VFS_TO_TMPFS(vp->v_mount); 644 de = node->tn_lookup_dirent; 645 KASSERT(de != NULL); 646 647 /* XXX: Why isn't this done by the caller? */ 648 if (vp->v_type == VDIR) { 649 error = EISDIR; 650 goto out; 651 } 652 653 /* Files marked as immutable or append-only cannot be deleted. */ 654 if (node->tn_flags & (IMMUTABLE | APPEND)) { 655 error = EPERM; 656 goto out; 657 } 658 659 /* Remove the entry from the directory; as it is a file, we do not 660 * have to change the number of hard links of the directory. */ 661 tmpfs_dir_detach(dvp, de); 662 663 /* Notify interested parties about the modification of dvp. 664 * The removal of vp is notified when it is reclaimed. */ 665 VN_KNOTE(dvp, NOTE_WRITE); 666 667 /* Free the directory entry we just deleted. Note that the node 668 * referred by it will not be removed until the vnode is really 669 * reclaimed. */ 670 tmpfs_free_dirent(tmp, de, TRUE); 671 672 error = 0; 673 674 out: 675 vput(dvp); 676 vput(vp); 677 678 KASSERT(!VOP_ISLOCKED(dvp)); 679 680 return error; 681 } 682 683 /* --------------------------------------------------------------------- */ 684 685 int 686 tmpfs_link(void *v) 687 { 688 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 689 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 690 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 691 692 int error; 693 struct tmpfs_dirent *de; 694 struct tmpfs_node *dnode; 695 struct tmpfs_node *node; 696 697 KASSERT(VOP_ISLOCKED(dvp)); 698 KASSERT(!VOP_ISLOCKED(vp)); 699 KASSERT(cnp->cn_flags & HASBUF); 700 KASSERT(dvp != vp); /* XXX When can this be false? */ 701 702 dnode = VP_TO_TMPFS_DIR(dvp); 703 node = VP_TO_TMPFS_NODE(vp); 704 705 /* Lock vp because we will need to run VOP_UPDATE over it, which 706 * needs the vnode to be locked. */ 707 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 708 if (error != 0) 709 goto out; 710 711 /* XXX: Why aren't the following two tests done by the caller? */ 712 713 /* Hard links of directories are forbidden. */ 714 if (vp->v_type == VDIR) { 715 error = EPERM; 716 goto out; 717 } 718 719 /* Cannot create cross-device links. */ 720 if (dvp->v_mount != vp->v_mount) { 721 error = EXDEV; 722 goto out; 723 } 724 725 /* Ensure that we do not overflow the maximum number of links imposed 726 * by the system. */ 727 KASSERT(node->tn_links <= LINK_MAX); 728 if (node->tn_links == LINK_MAX) { 729 error = EMLINK; 730 goto out; 731 } 732 733 /* We cannot create links of files marked immutable or append-only. */ 734 if (node->tn_flags & (IMMUTABLE | APPEND)) { 735 error = EPERM; 736 goto out; 737 } 738 739 /* Allocate a new directory entry to represent the node. */ 740 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 741 cnp->cn_nameptr, cnp->cn_namelen, &de); 742 if (error != 0) 743 goto out; 744 745 /* Insert the new directory entry into the appropriate directory. */ 746 tmpfs_dir_attach(dvp, de); 747 VN_KNOTE(dvp, NOTE_WRITE); 748 749 /* vp link count has changed, so update node times. */ 750 node->tn_status |= TMPFS_NODE_CHANGED; 751 (void)VOP_UPDATE(vp, NULL, NULL, 0); 752 753 error = 0; 754 755 out: 756 if (VOP_ISLOCKED(vp)) 757 VOP_UNLOCK(vp, 0); 758 759 if (error == 0) 760 PNBUF_PUT(cnp->cn_pnbuf); 761 762 vput(dvp); 763 764 /* XXX Locking status of dvp does not match manual page. */ 765 KASSERT(!VOP_ISLOCKED(dvp)); 766 KASSERT(!VOP_ISLOCKED(vp)); 767 KASSERT(IFF(error == 0, cnp->cn_flags & HASBUF)); 768 769 return error; 770 } 771 772 /* --------------------------------------------------------------------- */ 773 774 int 775 tmpfs_rename(void *v) 776 { 777 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 778 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 779 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 780 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 781 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 782 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 783 784 char *newname; 785 int error; 786 struct tmpfs_dirent *de; 787 struct tmpfs_mount *tmp; 788 struct tmpfs_node *fdnode; 789 struct tmpfs_node *fnode; 790 struct tmpfs_node *tdnode; 791 792 KASSERT(VOP_ISLOCKED(tdvp)); 793 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 794 KASSERT(fcnp->cn_flags & HASBUF); 795 KASSERT(tcnp->cn_flags & HASBUF); 796 797 fdnode = VP_TO_TMPFS_DIR(fdvp); 798 fnode = VP_TO_TMPFS_NODE(fvp); 799 de = fnode->tn_lookup_dirent; 800 801 /* Disallow cross-device renames. 802 * XXX Why isn't this done by the caller? */ 803 if (fvp->v_mount != tdvp->v_mount || 804 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 805 error = EXDEV; 806 goto out; 807 } 808 809 tmp = VFS_TO_TMPFS(tdvp->v_mount); 810 tdnode = VP_TO_TMPFS_DIR(tdvp); 811 812 /* If source and target are the same file, there is nothing to do. */ 813 if (fvp == tvp) { 814 error = 0; 815 goto out; 816 } 817 818 /* Avoid manipulating '.' and '..' entries. */ 819 if (de == NULL) { 820 KASSERT(fvp->v_type == VDIR); 821 error = EINVAL; 822 goto out; 823 } 824 KASSERT(de->td_node == fnode); 825 826 /* Ensure that we have enough memory to hold the new name, if it 827 * has to be changed. */ 828 if (fcnp->cn_namelen != tcnp->cn_namelen || 829 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 830 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 831 tcnp->cn_namelen, 0); 832 if (newname == NULL) { 833 error = ENOSPC; 834 goto out; 835 } 836 } else 837 newname = NULL; 838 839 /* If the node is being moved to another directory, we have to do 840 * the move. */ 841 if (fdnode != tdnode) { 842 /* In case we are moving a directory, we have to adjust its 843 * parent to point to the new parent. */ 844 if (de->td_node->tn_type == VDIR) { 845 struct tmpfs_node *n; 846 847 /* Ensure the target directory is not a child of the 848 * directory being moved. Otherwise, we'd end up 849 * with stale nodes. */ 850 n = tdnode; 851 while (n != n->tn_parent) { 852 if (n == fnode) { 853 error = EINVAL; 854 goto out; 855 } 856 n = n->tn_parent; 857 } 858 859 /* Adjust the parent pointer. */ 860 TMPFS_VALIDATE_DIR(fnode); 861 de->td_node->tn_parent = tdnode; 862 863 /* As a result of changing the target of the '..' 864 * entry, the link count of the source and target 865 * directories has to be adjusted. */ 866 fdnode->tn_links--; 867 tdnode->tn_links++; 868 } 869 870 /* Do the move: just remove the entry from the source directory 871 * and insert it into the target one. */ 872 tmpfs_dir_detach(fdvp, de); 873 tmpfs_dir_attach(tdvp, de); 874 875 /* Notify listeners of fdvp about the change in the directory. 876 * We can do it at this point because we aren't touching fdvp 877 * any more below. */ 878 VN_KNOTE(fdvp, NOTE_WRITE); 879 } 880 881 /* If the name has changed, we need to make it effective by changing 882 * it in the directory entry. */ 883 if (newname != NULL) { 884 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 885 KASSERT(tcnp->cn_namelen < 0xffff); 886 887 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 888 de->td_namelen); 889 de->td_namelen = (uint16_t)tcnp->cn_namelen; 890 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 891 de->td_name = newname; 892 893 fnode->tn_status |= TMPFS_NODE_MODIFIED; 894 } 895 896 /* If we are overwriting an entry, we have to remove the old one 897 * from the target directory. */ 898 if (tvp != NULL) { 899 struct tmpfs_node *tnode; 900 901 tnode = VP_TO_TMPFS_NODE(tvp); 902 903 /* The source node cannot be a directory in this case. */ 904 KASSERT(fnode->tn_type != VDIR); 905 906 /* Remove the old entry from the target directory. */ 907 de = tnode->tn_lookup_dirent; 908 tmpfs_dir_detach(tdvp, de); 909 910 /* Free the directory entry we just deleted. Note that the 911 * node referred by it will not be removed until the vnode is 912 * really reclaimed. */ 913 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 914 } 915 916 /* Notify listeners of tdvp about the change in the directory (either 917 * because a new entry was added or because one was removed). */ 918 VN_KNOTE(tdvp, NOTE_WRITE); 919 920 error = 0; 921 922 out: 923 /* Release target nodes. */ 924 /* XXX: I don't understand when tdvp can be the same as tvp, but 925 * other code takes care of this... */ 926 if (tdvp == tvp) 927 vrele(tdvp); 928 else 929 vput(tdvp); 930 if (tvp != NULL) 931 vput(tvp); 932 933 /* Release source nodes. */ 934 vrele(fdvp); 935 vrele(fvp); 936 937 return error; 938 } 939 940 /* --------------------------------------------------------------------- */ 941 942 int 943 tmpfs_mkdir(void *v) 944 { 945 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 946 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 947 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 948 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 949 950 KASSERT(vap->va_type == VDIR); 951 952 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 953 } 954 955 /* --------------------------------------------------------------------- */ 956 957 int 958 tmpfs_rmdir(void *v) 959 { 960 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 961 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 962 963 int error; 964 struct tmpfs_dirent *de; 965 struct tmpfs_mount *tmp; 966 struct tmpfs_node *dnode; 967 struct tmpfs_node *node; 968 969 KASSERT(VOP_ISLOCKED(dvp)); 970 KASSERT(VOP_ISLOCKED(vp)); 971 972 tmp = VFS_TO_TMPFS(dvp->v_mount); 973 dnode = VP_TO_TMPFS_DIR(dvp); 974 node = VP_TO_TMPFS_DIR(vp); 975 KASSERT(node->tn_parent == dnode); 976 977 /* Get the directory entry associated with node (vp). This was 978 * filled by tmpfs_lookup while looking up the entry. */ 979 de = node->tn_lookup_dirent; 980 KASSERT(TMPFS_DIRENT_MATCHES(de, 981 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 982 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 983 984 /* Directories with more than two entries ('.' and '..') cannot be 985 * removed. */ 986 if (node->tn_size > 0) { 987 error = ENOTEMPTY; 988 goto out; 989 } 990 991 /* Check flags to see if we are allowed to remove the directory. */ 992 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 993 error = EPERM; 994 goto out; 995 } 996 997 /* Detach the directory entry from the directory (dnode). */ 998 tmpfs_dir_detach(dvp, de); 999 1000 node->tn_links--; 1001 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1002 TMPFS_NODE_MODIFIED; 1003 node->tn_parent->tn_links--; 1004 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1005 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1006 1007 /* Notify modification of parent directory and release it. */ 1008 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1009 cache_purge(dvp); /* XXX Is this needed? */ 1010 vput(dvp); 1011 1012 /* Free the directory entry we just deleted. Note that the node 1013 * referred by it will not be removed until the vnode is really 1014 * reclaimed. */ 1015 tmpfs_free_dirent(tmp, de, TRUE); 1016 1017 /* Release the deleted vnode (will destroy the node, notify 1018 * interested parties and clean it from the cache). */ 1019 vput(vp); 1020 1021 /* As the directory has been modified, invalidate readdir cached 1022 * values. */ 1023 dnode->tn_readdir_lastn = 0; 1024 dnode->tn_readdir_lastp = NULL; 1025 1026 error = 0; 1027 1028 out: 1029 if (error != 0) { 1030 vput(dvp); 1031 vput(vp); 1032 } 1033 1034 return error; 1035 } 1036 1037 /* --------------------------------------------------------------------- */ 1038 1039 int 1040 tmpfs_symlink(void *v) 1041 { 1042 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1043 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1044 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1045 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1046 char *target = ((struct vop_symlink_args *)v)->a_target; 1047 1048 KASSERT(vap->va_type == VLNK); 1049 1050 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1051 } 1052 1053 /* --------------------------------------------------------------------- */ 1054 1055 int 1056 tmpfs_readdir(void *v) 1057 { 1058 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1059 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1060 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1061 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1062 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1063 1064 int error; 1065 off_t realsize, startoff; 1066 struct tmpfs_node *node; 1067 1068 KASSERT(VOP_ISLOCKED(vp)); 1069 1070 /* This operation only makes sense on directory nodes. */ 1071 if (vp->v_type != VDIR) { 1072 error = ENOTDIR; 1073 goto out; 1074 } 1075 1076 node = VP_TO_TMPFS_DIR(vp); 1077 realsize = node->tn_size + sizeof(struct tmpfs_dirent) * 2; 1078 1079 /* The offset cannot extend past the end of the directory. */ 1080 if (uio->uio_offset >= realsize) { 1081 error = EINVAL; 1082 goto out; 1083 } 1084 1085 /* The offset must be correctly aligned at the begining of 1086 * tmpfs_dirent structures. */ 1087 if (uio->uio_offset % sizeof(struct tmpfs_dirent) > 0) { 1088 error = EINVAL; 1089 goto out; 1090 } 1091 1092 startoff = uio->uio_offset; 1093 1094 if (uio->uio_offset == 0) { 1095 error = tmpfs_dir_getdotdent(node, uio); 1096 if (error == -1) { 1097 error = 0; 1098 goto outok; 1099 } else if (error != 0) 1100 goto outok; 1101 } 1102 1103 if (uio->uio_offset == sizeof(struct tmpfs_dirent)) { 1104 error = tmpfs_dir_getdotdotdent(node, uio); 1105 if (error == -1) { 1106 error = 0; 1107 goto outok; 1108 } else if (error != 0) 1109 goto outok; 1110 } 1111 1112 if (uio->uio_offset == realsize) { 1113 error = 0; 1114 goto outok; 1115 } 1116 KASSERT(uio->uio_offset < realsize); 1117 1118 error = tmpfs_dir_getdents(node, uio); 1119 if (error == -1) 1120 error = 0; 1121 KASSERT(error >= 0); 1122 1123 outok: 1124 /* This label assumes that startoff, node and realsize have been 1125 * initialized. If the compiler didn't spit out warnings, we'd 1126 * simply make this one be 'out' and drop 'outok'. */ 1127 1128 if (eofflag != NULL) 1129 *eofflag = 1130 (error == 0 && uio->uio_offset == realsize); 1131 1132 /* Update NFS-related variables. */ 1133 if (error == 0 && cookies != NULL && ncookies != NULL) { 1134 long cnt, startcnt; 1135 off_t i; 1136 1137 startcnt = startoff / sizeof(struct tmpfs_dirent); 1138 cnt = uio->uio_offset / sizeof(struct tmpfs_dirent); 1139 *ncookies = cnt - startcnt; 1140 *cookies = (off_t *)malloc((*ncookies) * sizeof(off_t), 1141 M_TEMP, M_WAITOK); 1142 1143 for (i = 0; i < *ncookies; i++) 1144 (*cookies)[i] = (startcnt + i + 1) * 1145 sizeof(struct tmpfs_dirent); 1146 } 1147 1148 out: 1149 KASSERT(VOP_ISLOCKED(vp)); 1150 1151 return error; 1152 } 1153 1154 /* --------------------------------------------------------------------- */ 1155 1156 int 1157 tmpfs_readlink(void *v) 1158 { 1159 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1160 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1161 1162 int error; 1163 struct tmpfs_node *node; 1164 1165 KASSERT(VOP_ISLOCKED(vp)); 1166 KASSERT(uio->uio_offset == 0); 1167 KASSERT(vp->v_type == VLNK); 1168 1169 node = VP_TO_TMPFS_NODE(vp); 1170 1171 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1172 uio); 1173 node->tn_status |= TMPFS_NODE_ACCESSED; 1174 1175 KASSERT(VOP_ISLOCKED(vp)); 1176 1177 return error; 1178 } 1179 1180 /* --------------------------------------------------------------------- */ 1181 1182 int 1183 tmpfs_inactive(void *v) 1184 { 1185 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1186 struct proc *p = ((struct vop_inactive_args *)v)->a_p; 1187 1188 struct tmpfs_node *node; 1189 1190 KASSERT(VOP_ISLOCKED(vp)); 1191 1192 node = VP_TO_TMPFS_NODE(vp); 1193 1194 VOP_UNLOCK(vp, 0); 1195 1196 if (node->tn_links == 0) 1197 vrecycle(vp, NULL, p); 1198 1199 return 0; 1200 } 1201 1202 /* --------------------------------------------------------------------- */ 1203 1204 int 1205 tmpfs_reclaim(void *v) 1206 { 1207 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1208 1209 struct tmpfs_mount *tmp; 1210 struct tmpfs_node *node; 1211 1212 KASSERT(!VOP_ISLOCKED(vp)); 1213 1214 node = VP_TO_TMPFS_NODE(vp); 1215 tmp = VFS_TO_TMPFS(vp->v_mount); 1216 1217 if (node->tn_links == 0) 1218 VN_KNOTE(vp, NOTE_DELETE); 1219 1220 cache_purge(vp); 1221 tmpfs_free_vp(vp); 1222 1223 /* If the node referenced by this vnode was deleted by the user, 1224 * we must free its associated data structures (now that the vnode 1225 * is being reclaimed). */ 1226 if (node->tn_links == 0) 1227 tmpfs_free_node(tmp, node); 1228 1229 KASSERT(!VOP_ISLOCKED(vp)); 1230 KASSERT(vp->v_data == NULL); 1231 1232 return 0; 1233 } 1234 1235 /* --------------------------------------------------------------------- */ 1236 1237 int 1238 tmpfs_print(void *v) 1239 { 1240 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1241 1242 struct tmpfs_node *node; 1243 1244 node = VP_TO_TMPFS_NODE(vp); 1245 1246 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1247 node, node->tn_flags, node->tn_links); 1248 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1249 ", status 0x%x\n", 1250 node->tn_mode, node->tn_uid, node->tn_gid, 1251 (uintmax_t)node->tn_size, node->tn_status); 1252 1253 if (vp->v_type == VFIFO) 1254 fifo_printinfo(vp); 1255 lockmgr_printinfo(&vp->v_lock); 1256 1257 printf("\n"); 1258 1259 return 0; 1260 } 1261 1262 /* --------------------------------------------------------------------- */ 1263 1264 int 1265 tmpfs_pathconf(void *v) 1266 { 1267 int name = ((struct vop_pathconf_args *)v)->a_name; 1268 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1269 1270 int error; 1271 1272 error = 0; 1273 1274 switch (name) { 1275 case _PC_LINK_MAX: 1276 *retval = LINK_MAX; 1277 break; 1278 1279 case _PC_NAME_MAX: 1280 *retval = NAME_MAX; 1281 break; 1282 1283 case _PC_PATH_MAX: 1284 *retval = PATH_MAX; 1285 break; 1286 1287 case _PC_PIPE_BUF: 1288 *retval = PIPE_BUF; 1289 break; 1290 1291 case _PC_CHOWN_RESTRICTED: 1292 *retval = 1; 1293 break; 1294 1295 case _PC_NO_TRUNC: 1296 *retval = 1; 1297 break; 1298 1299 case _PC_SYNC_IO: 1300 *retval = 1; 1301 break; 1302 1303 case _PC_FILESIZEBITS: 1304 *retval = 0; /* XXX Don't know which value should I return. */ 1305 break; 1306 1307 default: 1308 error = EINVAL; 1309 } 1310 1311 return error; 1312 } 1313 1314 /* --------------------------------------------------------------------- */ 1315 1316 int 1317 tmpfs_truncate(void *v) 1318 { 1319 struct vnode *vp = ((struct vop_truncate_args *)v)->a_vp; 1320 off_t length = ((struct vop_truncate_args *)v)->a_length; 1321 1322 boolean_t extended; 1323 int error; 1324 struct tmpfs_node *node; 1325 1326 node = VP_TO_TMPFS_NODE(vp); 1327 extended = length > node->tn_size; 1328 1329 if (length < 0) { 1330 error = EINVAL; 1331 goto out; 1332 } 1333 1334 if (node->tn_size == length) { 1335 error = 0; 1336 goto out; 1337 } 1338 1339 error = tmpfs_reg_resize(vp, length); 1340 if (error == 0) { 1341 VN_KNOTE(vp, NOTE_ATTRIB | (extended ? NOTE_EXTEND : 0)); 1342 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1343 } 1344 1345 out: 1346 (void)VOP_UPDATE(vp, NULL, NULL, 0); 1347 1348 return error; 1349 } 1350 1351 /* --------------------------------------------------------------------- */ 1352 1353 int 1354 tmpfs_update(void *v) 1355 { 1356 struct vnode *vp = ((struct vop_update_args *)v)->a_vp; 1357 struct timespec *access = ((struct vop_update_args *)v)->a_access; 1358 struct timespec *modify = ((struct vop_update_args *)v)->a_modify; 1359 int flags = ((struct vop_update_args *)v)->a_flags; 1360 1361 struct timespec ts; 1362 struct timeval tv; 1363 struct tmpfs_node *node; 1364 1365 KASSERT(VOP_ISLOCKED(vp)); 1366 1367 node = VP_TO_TMPFS_NODE(vp); 1368 1369 if (flags & UPDATE_CLOSE) 1370 ; /* XXX Need to do anything special? */ 1371 1372 if (node->tn_status != 0) { 1373 microtime(&tv); 1374 TIMEVAL_TO_TIMESPEC(&tv, &ts); 1375 1376 if (node->tn_status & TMPFS_NODE_ACCESSED) 1377 node->tn_atime = 1378 (access != NULL ? *access : ts); 1379 if (node->tn_status & TMPFS_NODE_MODIFIED) 1380 node->tn_mtime = 1381 (modify != NULL ? *modify : ts); 1382 if (node->tn_status & TMPFS_NODE_CHANGED) 1383 node->tn_ctime = ts; 1384 1385 node->tn_status &= 1386 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1387 TMPFS_NODE_CHANGED); 1388 } 1389 1390 KASSERT(VOP_ISLOCKED(vp)); 1391 1392 return 0; 1393 } 1394 1395 /* --------------------------------------------------------------------- */ 1396 1397 int 1398 tmpfs_getpages(void *v) 1399 { 1400 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1401 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1402 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1403 int *count = ((struct vop_getpages_args *)v)->a_count; 1404 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1405 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1406 int flags = ((struct vop_getpages_args *)v)->a_flags; 1407 1408 int error; 1409 struct tmpfs_node *node; 1410 1411 KASSERT(offset == trunc_page(offset)); 1412 1413 node = VP_TO_TMPFS_NODE(vp); 1414 1415 if (offset < 0 || offset > vp->v_size) { 1416 error = EINVAL; 1417 goto out; 1418 } 1419 1420 if (flags & PGO_LOCKED) { 1421 uvn_findpages(&vp->v_uobj, offset, count, m, 1422 UFP_NOWAIT | UFP_NOALLOC | 1423 (access_type & VM_PROT_WRITE ? UFP_NORDONLY : 0)); 1424 1425 error = (m[centeridx] == NULL ? EBUSY : 0); 1426 goto out; 1427 } 1428 1429 error = uvm_loan(kernel_map, node->tn_va + offset, (*count) * 1430 PAGE_SIZE, m, UVM_LOAN_TOPAGE); 1431 node->tn_status |= TMPFS_NODE_ACCESSED; 1432 1433 out: 1434 return error; 1435 } 1436
Indexes created Sun Sep 21 15:09:59 GMT 2025