tmpfs_vnops.c revision 1.58
1 /* $NetBSD: tmpfs_vnops.c,v 1.58 2009/04/15 11:41:25 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 2006, 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.58 2009/04/15 11:41:25 yamt Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/dirent.h> 42 #include <sys/fcntl.h> 43 #include <sys/event.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/stat.h> 48 #include <sys/uio.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/lockf.h> 52 #include <sys/kauth.h> 53 54 #include <uvm/uvm.h> 55 56 #include <miscfs/fifofs/fifo.h> 57 #include <fs/tmpfs/tmpfs_vnops.h> 58 #include <fs/tmpfs/tmpfs.h> 59 60 /* --------------------------------------------------------------------- */ 61 62 /* 63 * vnode operations vector used for files stored in a tmpfs file system. 64 */ 65 int (**tmpfs_vnodeop_p)(void *); 66 const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 67 { &vop_default_desc, vn_default_error }, 68 { &vop_lookup_desc, tmpfs_lookup }, 69 { &vop_create_desc, tmpfs_create }, 70 { &vop_mknod_desc, tmpfs_mknod }, 71 { &vop_open_desc, tmpfs_open }, 72 { &vop_close_desc, tmpfs_close }, 73 { &vop_access_desc, tmpfs_access }, 74 { &vop_getattr_desc, tmpfs_getattr }, 75 { &vop_setattr_desc, tmpfs_setattr }, 76 { &vop_read_desc, tmpfs_read }, 77 { &vop_write_desc, tmpfs_write }, 78 { &vop_ioctl_desc, tmpfs_ioctl }, 79 { &vop_fcntl_desc, tmpfs_fcntl }, 80 { &vop_poll_desc, tmpfs_poll }, 81 { &vop_kqfilter_desc, tmpfs_kqfilter }, 82 { &vop_revoke_desc, tmpfs_revoke }, 83 { &vop_mmap_desc, tmpfs_mmap }, 84 { &vop_fsync_desc, tmpfs_fsync }, 85 { &vop_seek_desc, tmpfs_seek }, 86 { &vop_remove_desc, tmpfs_remove }, 87 { &vop_link_desc, tmpfs_link }, 88 { &vop_rename_desc, tmpfs_rename }, 89 { &vop_mkdir_desc, tmpfs_mkdir }, 90 { &vop_rmdir_desc, tmpfs_rmdir }, 91 { &vop_symlink_desc, tmpfs_symlink }, 92 { &vop_readdir_desc, tmpfs_readdir }, 93 { &vop_readlink_desc, tmpfs_readlink }, 94 { &vop_abortop_desc, tmpfs_abortop }, 95 { &vop_inactive_desc, tmpfs_inactive }, 96 { &vop_reclaim_desc, tmpfs_reclaim }, 97 { &vop_lock_desc, tmpfs_lock }, 98 { &vop_unlock_desc, tmpfs_unlock }, 99 { &vop_bmap_desc, tmpfs_bmap }, 100 { &vop_strategy_desc, tmpfs_strategy }, 101 { &vop_print_desc, tmpfs_print }, 102 { &vop_pathconf_desc, tmpfs_pathconf }, 103 { &vop_islocked_desc, tmpfs_islocked }, 104 { &vop_advlock_desc, tmpfs_advlock }, 105 { &vop_bwrite_desc, tmpfs_bwrite }, 106 { &vop_getpages_desc, tmpfs_getpages }, 107 { &vop_putpages_desc, tmpfs_putpages }, 108 { NULL, NULL } 109 }; 110 const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 111 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 112 113 /* --------------------------------------------------------------------- */ 114 115 int 116 tmpfs_lookup(void *v) 117 { 118 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 119 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 120 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 121 122 int error; 123 struct tmpfs_dirent *de; 124 struct tmpfs_node *dnode; 125 126 KASSERT(VOP_ISLOCKED(dvp)); 127 128 dnode = VP_TO_TMPFS_DIR(dvp); 129 *vpp = NULL; 130 131 /* Check accessibility of requested node as a first step. */ 132 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 133 if (error != 0) 134 goto out; 135 136 /* If requesting the last path component on a read-only file system 137 * with a write operation, deny it. */ 138 if ((cnp->cn_flags & ISLASTCN) && 139 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 140 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 141 error = EROFS; 142 goto out; 143 } 144 145 /* Avoid doing a linear scan of the directory if the requested 146 * directory/name couple is already in the cache. */ 147 error = cache_lookup(dvp, vpp, cnp); 148 if (error >= 0) 149 goto out; 150 151 /* We cannot be requesting the parent directory of the root node. */ 152 KASSERT(IMPLIES(dnode->tn_type == VDIR && 153 dnode->tn_spec.tn_dir.tn_parent == dnode, 154 !(cnp->cn_flags & ISDOTDOT))); 155 156 if (cnp->cn_flags & ISDOTDOT) { 157 VOP_UNLOCK(dvp, 0); 158 159 /* Allocate a new vnode on the matching entry. */ 160 error = tmpfs_alloc_vp(dvp->v_mount, 161 dnode->tn_spec.tn_dir.tn_parent, vpp); 162 163 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 164 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 165 VREF(dvp); 166 *vpp = dvp; 167 error = 0; 168 } else { 169 de = tmpfs_dir_lookup(dnode, cnp); 170 if (de == NULL) { 171 /* The entry was not found in the directory. 172 * This is OK iff we are creating or renaming an 173 * entry and are working on the last component of 174 * the path name. */ 175 if ((cnp->cn_flags & ISLASTCN) && 176 (cnp->cn_nameiop == CREATE || \ 177 cnp->cn_nameiop == RENAME)) { 178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 179 if (error != 0) 180 goto out; 181 182 /* Keep the component name in the buffer for 183 * future uses. */ 184 cnp->cn_flags |= SAVENAME; 185 186 error = EJUSTRETURN; 187 } else 188 error = ENOENT; 189 } else { 190 struct tmpfs_node *tnode; 191 192 /* The entry was found, so get its associated 193 * tmpfs_node. */ 194 tnode = de->td_node; 195 196 /* If we are not at the last path component and 197 * found a non-directory or non-link entry (which 198 * may itself be pointing to a directory), raise 199 * an error. */ 200 if ((tnode->tn_type != VDIR && 201 tnode->tn_type != VLNK) && 202 !(cnp->cn_flags & ISLASTCN)) { 203 error = ENOTDIR; 204 goto out; 205 } 206 207 /* If we are deleting or renaming the entry, keep 208 * track of its tmpfs_dirent so that it can be 209 * easily deleted later. */ 210 if ((cnp->cn_flags & ISLASTCN) && 211 (cnp->cn_nameiop == DELETE || 212 cnp->cn_nameiop == RENAME)) { 213 if ((dnode->tn_mode & S_ISTXT) != 0 && 214 kauth_authorize_generic(cnp->cn_cred, 215 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 216 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 217 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 218 return EPERM; 219 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 220 if (error != 0) 221 goto out; 222 cnp->cn_flags |= SAVENAME; 223 } else 224 de = NULL; 225 226 /* Allocate a new vnode on the matching entry. */ 227 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 228 } 229 } 230 231 /* Store the result of this lookup in the cache. Avoid this if the 232 * request was for creation, as it does not improve timings on 233 * emprical tests. */ 234 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 235 (cnp->cn_flags & ISDOTDOT) == 0) 236 cache_enter(dvp, *vpp, cnp); 237 238 out: 239 /* If there were no errors, *vpp cannot be null and it must be 240 * locked. */ 241 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 242 243 /* dvp must always be locked. */ 244 KASSERT(VOP_ISLOCKED(dvp)); 245 246 return error; 247 } 248 249 /* --------------------------------------------------------------------- */ 250 251 int 252 tmpfs_create(void *v) 253 { 254 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 255 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 256 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 257 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 258 259 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 260 261 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 262 } 263 /* --------------------------------------------------------------------- */ 264 265 int 266 tmpfs_mknod(void *v) 267 { 268 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 269 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 270 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 271 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 272 273 if (vap->va_type != VBLK && vap->va_type != VCHR && 274 vap->va_type != VFIFO) { 275 vput(dvp); 276 return EINVAL; 277 } 278 279 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 280 } 281 282 /* --------------------------------------------------------------------- */ 283 284 int 285 tmpfs_open(void *v) 286 { 287 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 288 int mode = ((struct vop_open_args *)v)->a_mode; 289 290 int error; 291 struct tmpfs_node *node; 292 293 KASSERT(VOP_ISLOCKED(vp)); 294 295 node = VP_TO_TMPFS_NODE(vp); 296 297 /* The file is still active but all its names have been removed 298 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 299 * it is about to die. */ 300 if (node->tn_links < 1) { 301 error = ENOENT; 302 goto out; 303 } 304 305 /* If the file is marked append-only, deny write requests. */ 306 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 307 error = EPERM; 308 else 309 error = 0; 310 311 out: 312 KASSERT(VOP_ISLOCKED(vp)); 313 314 return error; 315 } 316 317 /* --------------------------------------------------------------------- */ 318 319 int 320 tmpfs_close(void *v) 321 { 322 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 323 324 struct tmpfs_node *node; 325 326 KASSERT(VOP_ISLOCKED(vp)); 327 328 node = VP_TO_TMPFS_NODE(vp); 329 330 if (node->tn_links > 0) { 331 /* Update node times. No need to do it if the node has 332 * been deleted, because it will vanish after we return. */ 333 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 334 } 335 336 return 0; 337 } 338 339 /* --------------------------------------------------------------------- */ 340 341 int 342 tmpfs_access(void *v) 343 { 344 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 345 int mode = ((struct vop_access_args *)v)->a_mode; 346 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 347 348 int error; 349 struct tmpfs_node *node; 350 351 KASSERT(VOP_ISLOCKED(vp)); 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 switch (vp->v_type) { 356 case VDIR: 357 /* FALLTHROUGH */ 358 case VLNK: 359 /* FALLTHROUGH */ 360 case VREG: 361 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 362 error = EROFS; 363 goto out; 364 } 365 break; 366 367 case VBLK: 368 /* FALLTHROUGH */ 369 case VCHR: 370 /* FALLTHROUGH */ 371 case VSOCK: 372 /* FALLTHROUGH */ 373 case VFIFO: 374 break; 375 376 default: 377 error = EINVAL; 378 goto out; 379 } 380 381 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 382 error = EPERM; 383 goto out; 384 } 385 386 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 387 node->tn_gid, mode, cred); 388 389 out: 390 KASSERT(VOP_ISLOCKED(vp)); 391 392 return error; 393 } 394 395 /* --------------------------------------------------------------------- */ 396 397 int 398 tmpfs_getattr(void *v) 399 { 400 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 401 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 402 403 struct tmpfs_node *node; 404 405 node = VP_TO_TMPFS_NODE(vp); 406 407 VATTR_NULL(vap); 408 409 tmpfs_itimes(vp, NULL, NULL, NULL); 410 411 vap->va_type = vp->v_type; 412 vap->va_mode = node->tn_mode; 413 vap->va_nlink = node->tn_links; 414 vap->va_uid = node->tn_uid; 415 vap->va_gid = node->tn_gid; 416 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 417 vap->va_fileid = node->tn_id; 418 vap->va_size = node->tn_size; 419 vap->va_blocksize = PAGE_SIZE; 420 vap->va_atime = node->tn_atime; 421 vap->va_mtime = node->tn_mtime; 422 vap->va_ctime = node->tn_ctime; 423 vap->va_birthtime = node->tn_birthtime; 424 vap->va_gen = node->tn_gen; 425 vap->va_flags = node->tn_flags; 426 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 427 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 428 vap->va_bytes = round_page(node->tn_size); 429 vap->va_filerev = VNOVAL; 430 vap->va_vaflags = 0; 431 vap->va_spare = VNOVAL; /* XXX */ 432 433 return 0; 434 } 435 436 /* --------------------------------------------------------------------- */ 437 438 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 439 /* XXX Should this operation be atomic? I think it should, but code in 440 * XXX other places (e.g., ufs) doesn't seem to be... */ 441 int 442 tmpfs_setattr(void *v) 443 { 444 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 445 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 446 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 447 struct lwp *l = curlwp; 448 449 int error; 450 451 KASSERT(VOP_ISLOCKED(vp)); 452 453 error = 0; 454 455 /* Abort if any unsettable attribute is given. */ 456 if (vap->va_type != VNON || 457 vap->va_nlink != VNOVAL || 458 vap->va_fsid != VNOVAL || 459 vap->va_fileid != VNOVAL || 460 vap->va_blocksize != VNOVAL || 461 GOODTIME(&vap->va_ctime) || 462 vap->va_gen != VNOVAL || 463 vap->va_rdev != VNOVAL || 464 vap->va_bytes != VNOVAL) 465 error = EINVAL; 466 467 if (error == 0 && (vap->va_flags != VNOVAL)) 468 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 469 470 if (error == 0 && (vap->va_size != VNOVAL)) 471 error = tmpfs_chsize(vp, vap->va_size, cred, l); 472 473 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 474 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 475 476 if (error == 0 && (vap->va_mode != VNOVAL)) 477 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 478 479 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 480 || GOODTIME(&vap->va_birthtime))) 481 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 482 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 483 return 0; 484 485 /* Update the node times. We give preference to the error codes 486 * generated by this function rather than the ones that may arise 487 * from tmpfs_update. */ 488 tmpfs_update(vp, NULL, NULL, NULL, 0); 489 490 KASSERT(VOP_ISLOCKED(vp)); 491 492 return error; 493 } 494 495 /* --------------------------------------------------------------------- */ 496 497 int 498 tmpfs_read(void *v) 499 { 500 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 501 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 502 int ioflag = ((struct vop_read_args *)v)->a_ioflag; 503 504 int error; 505 struct tmpfs_node *node; 506 struct uvm_object *uobj; 507 508 KASSERT(VOP_ISLOCKED(vp)); 509 510 node = VP_TO_TMPFS_NODE(vp); 511 512 if (vp->v_type != VREG) { 513 error = EISDIR; 514 goto out; 515 } 516 517 if (uio->uio_offset < 0) { 518 error = EINVAL; 519 goto out; 520 } 521 522 node->tn_status |= TMPFS_NODE_ACCESSED; 523 524 uobj = node->tn_spec.tn_reg.tn_aobj; 525 error = 0; 526 while (error == 0 && uio->uio_resid > 0) { 527 vsize_t len; 528 529 if (node->tn_size <= uio->uio_offset) 530 break; 531 532 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 533 if (len == 0) 534 break; 535 536 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 537 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 538 } 539 540 out: 541 KASSERT(VOP_ISLOCKED(vp)); 542 543 return error; 544 } 545 546 /* --------------------------------------------------------------------- */ 547 548 int 549 tmpfs_write(void *v) 550 { 551 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 552 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 553 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 554 555 bool extended; 556 int error; 557 off_t oldsize; 558 struct tmpfs_node *node; 559 struct uvm_object *uobj; 560 561 KASSERT(VOP_ISLOCKED(vp)); 562 563 node = VP_TO_TMPFS_NODE(vp); 564 oldsize = node->tn_size; 565 566 if (uio->uio_offset < 0 || vp->v_type != VREG) { 567 error = EINVAL; 568 goto out; 569 } 570 571 if (uio->uio_resid == 0) { 572 error = 0; 573 goto out; 574 } 575 576 if (ioflag & IO_APPEND) 577 uio->uio_offset = node->tn_size; 578 579 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 580 if (extended) { 581 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 582 if (error != 0) 583 goto out; 584 } 585 586 uobj = node->tn_spec.tn_reg.tn_aobj; 587 error = 0; 588 while (error == 0 && uio->uio_resid > 0) { 589 vsize_t len; 590 591 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 592 if (len == 0) 593 break; 594 595 error = ubc_uiomove(uobj, uio, len, IO_ADV_DECODE(ioflag), 596 UBC_WRITE | UBC_UNMAP_FLAG(vp)); 597 } 598 599 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 600 (extended ? TMPFS_NODE_CHANGED : 0); 601 602 if (error != 0) 603 (void)tmpfs_reg_resize(vp, oldsize); 604 605 VN_KNOTE(vp, NOTE_WRITE); 606 607 out: 608 KASSERT(VOP_ISLOCKED(vp)); 609 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 610 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 611 612 return error; 613 } 614 615 /* --------------------------------------------------------------------- */ 616 617 int 618 tmpfs_fsync(void *v) 619 { 620 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 621 622 KASSERT(VOP_ISLOCKED(vp)); 623 624 tmpfs_update(vp, NULL, NULL, NULL, 0); 625 626 return 0; 627 } 628 629 /* --------------------------------------------------------------------- */ 630 631 int 632 tmpfs_remove(void *v) 633 { 634 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 635 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 636 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 637 638 int error; 639 struct tmpfs_dirent *de; 640 struct tmpfs_mount *tmp; 641 struct tmpfs_node *dnode; 642 struct tmpfs_node *node; 643 644 KASSERT(VOP_ISLOCKED(dvp)); 645 KASSERT(VOP_ISLOCKED(vp)); 646 647 if (vp->v_type == VDIR) { 648 error = EPERM; 649 goto out; 650 } 651 652 dnode = VP_TO_TMPFS_DIR(dvp); 653 node = VP_TO_TMPFS_NODE(vp); 654 tmp = VFS_TO_TMPFS(vp->v_mount); 655 de = tmpfs_dir_lookup(dnode, cnp); 656 KASSERT(de); 657 KASSERT(de->td_node == node); 658 659 /* Files marked as immutable or append-only cannot be deleted. */ 660 if (node->tn_flags & (IMMUTABLE | APPEND)) { 661 error = EPERM; 662 goto out; 663 } 664 665 /* Remove the entry from the directory; as it is a file, we do not 666 * have to change the number of hard links of the directory. */ 667 tmpfs_dir_detach(dvp, de); 668 669 /* Free the directory entry we just deleted. Note that the node 670 * referred by it will not be removed until the vnode is really 671 * reclaimed. */ 672 tmpfs_free_dirent(tmp, de, true); 673 674 error = 0; 675 676 out: 677 vput(vp); 678 if (dvp == vp) 679 vrele(dvp); 680 else 681 vput(dvp); 682 PNBUF_PUT(cnp->cn_pnbuf); 683 684 return error; 685 } 686 687 /* --------------------------------------------------------------------- */ 688 689 int 690 tmpfs_link(void *v) 691 { 692 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 693 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 694 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 695 696 int error; 697 struct tmpfs_dirent *de; 698 struct tmpfs_node *dnode; 699 struct tmpfs_node *node; 700 701 KASSERT(VOP_ISLOCKED(dvp)); 702 KASSERT(cnp->cn_flags & HASBUF); 703 KASSERT(dvp != vp); /* XXX When can this be false? */ 704 705 dnode = VP_TO_TMPFS_DIR(dvp); 706 node = VP_TO_TMPFS_NODE(vp); 707 708 /* Lock vp because we will need to run tmpfs_update over it, which 709 * needs the vnode to be locked. */ 710 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 711 if (error != 0) 712 goto out1; 713 714 /* XXX: Why aren't the following two tests done by the caller? */ 715 716 /* Hard links of directories are forbidden. */ 717 if (vp->v_type == VDIR) { 718 error = EPERM; 719 goto out; 720 } 721 722 /* Cannot create cross-device links. */ 723 if (dvp->v_mount != vp->v_mount) { 724 error = EXDEV; 725 goto out; 726 } 727 728 /* Ensure that we do not overflow the maximum number of links imposed 729 * by the system. */ 730 KASSERT(node->tn_links <= LINK_MAX); 731 if (node->tn_links == LINK_MAX) { 732 error = EMLINK; 733 goto out; 734 } 735 736 /* We cannot create links of files marked immutable or append-only. */ 737 if (node->tn_flags & (IMMUTABLE | APPEND)) { 738 error = EPERM; 739 goto out; 740 } 741 742 /* Allocate a new directory entry to represent the node. */ 743 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 744 cnp->cn_nameptr, cnp->cn_namelen, &de); 745 if (error != 0) 746 goto out; 747 748 /* Insert the new directory entry into the appropriate directory. */ 749 tmpfs_dir_attach(dvp, de); 750 751 /* vp link count has changed, so update node times. */ 752 node->tn_status |= TMPFS_NODE_CHANGED; 753 tmpfs_update(vp, NULL, NULL, NULL, 0); 754 755 error = 0; 756 757 out: 758 VOP_UNLOCK(vp, 0); 759 out1: 760 PNBUF_PUT(cnp->cn_pnbuf); 761 762 vput(dvp); 763 764 return error; 765 } 766 767 /* --------------------------------------------------------------------- */ 768 769 int 770 tmpfs_rename(void *v) 771 { 772 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 773 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 774 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 775 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 776 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 777 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 778 779 char *newname; 780 int error; 781 struct tmpfs_dirent *de, *de2; 782 struct tmpfs_mount *tmp; 783 struct tmpfs_node *fdnode; 784 struct tmpfs_node *fnode; 785 struct tmpfs_node *tnode; 786 struct tmpfs_node *tdnode; 787 size_t namelen; 788 789 KASSERT(VOP_ISLOCKED(tdvp)); 790 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 791 KASSERT(fcnp->cn_flags & HASBUF); 792 KASSERT(tcnp->cn_flags & HASBUF); 793 794 newname = NULL; 795 namelen = 0; 796 tmp = NULL; 797 798 /* Disallow cross-device renames. */ 799 if (fvp->v_mount != tdvp->v_mount || 800 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 801 error = EXDEV; 802 goto out_unlocked; 803 } 804 805 fnode = VP_TO_TMPFS_NODE(fvp); 806 fdnode = VP_TO_TMPFS_DIR(fdvp); 807 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 808 tdnode = VP_TO_TMPFS_DIR(tdvp); 809 tmp = VFS_TO_TMPFS(tdvp->v_mount); 810 811 if (fdvp == tvp) { 812 error = 0; 813 goto out_unlocked; 814 } 815 816 /* If we need to move the directory between entries, lock the 817 * source so that we can safely operate on it. */ 818 819 /* XXX: this is a potential locking order violation! */ 820 if (fdnode != tdnode) { 821 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 822 if (error != 0) 823 goto out_unlocked; 824 } 825 826 /* 827 * If the node we were renaming has scarpered, just give up. 828 */ 829 de = tmpfs_dir_lookup(fdnode, fcnp); 830 if (de == NULL || de->td_node != fnode) { 831 error = ENOENT; 832 goto out; 833 } 834 835 /* If source and target are the same file, there is nothing to do. */ 836 if (fvp == tvp) { 837 error = 0; 838 goto out; 839 } 840 841 /* If replacing an existing entry, ensure we can do the operation. */ 842 if (tvp != NULL) { 843 KASSERT(tnode != NULL); 844 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 845 if (tnode->tn_size > 0) { 846 error = ENOTEMPTY; 847 goto out; 848 } 849 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 850 error = ENOTDIR; 851 goto out; 852 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 853 error = EISDIR; 854 goto out; 855 } else { 856 KASSERT(fnode->tn_type != VDIR && 857 tnode->tn_type != VDIR); 858 } 859 } 860 861 /* Ensure that we have enough memory to hold the new name, if it 862 * has to be changed. */ 863 namelen = tcnp->cn_namelen; 864 if (fcnp->cn_namelen != tcnp->cn_namelen || 865 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 866 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 867 if (newname == NULL) { 868 error = ENOSPC; 869 goto out; 870 } 871 } 872 873 /* If the node is being moved to another directory, we have to do 874 * the move. */ 875 if (fdnode != tdnode) { 876 /* In case we are moving a directory, we have to adjust its 877 * parent to point to the new parent. */ 878 if (de->td_node->tn_type == VDIR) { 879 struct tmpfs_node *n; 880 881 /* Ensure the target directory is not a child of the 882 * directory being moved. Otherwise, we'd end up 883 * with stale nodes. */ 884 n = tdnode; 885 while (n != n->tn_spec.tn_dir.tn_parent) { 886 if (n == fnode) { 887 error = EINVAL; 888 goto out; 889 } 890 n = n->tn_spec.tn_dir.tn_parent; 891 } 892 893 /* Adjust the parent pointer. */ 894 TMPFS_VALIDATE_DIR(fnode); 895 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 896 897 /* As a result of changing the target of the '..' 898 * entry, the link count of the source and target 899 * directories has to be adjusted. */ 900 fdnode->tn_links--; 901 tdnode->tn_links++; 902 } 903 904 /* Do the move: just remove the entry from the source directory 905 * and insert it into the target one. */ 906 tmpfs_dir_detach(fdvp, de); 907 tmpfs_dir_attach(tdvp, de); 908 909 /* Notify listeners of fdvp about the change in the directory. 910 * We can do it at this point because we aren't touching fdvp 911 * any more below. */ 912 VN_KNOTE(fdvp, NOTE_WRITE); 913 } 914 915 /* If we are overwriting an entry, we have to remove the old one 916 * from the target directory. */ 917 if (tvp != NULL) { 918 KASSERT(tnode != NULL); 919 920 /* Remove the old entry from the target directory. 921 * Note! This relies on tmpfs_dir_attach() putting the new 922 * node on the end of the target's node list. */ 923 de2 = tmpfs_dir_lookup(tdnode, tcnp); 924 KASSERT(de2 != NULL); 925 KASSERT(de2->td_node == tnode); 926 tmpfs_dir_detach(tdvp, de2); 927 928 /* Free the directory entry we just deleted. Note that the 929 * node referred by it will not be removed until the vnode is 930 * really reclaimed. */ 931 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 932 } 933 934 /* If the name has changed, we need to make it effective by changing 935 * it in the directory entry. */ 936 if (newname != NULL) { 937 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 938 KASSERT(tcnp->cn_namelen < 0xffff); 939 940 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 941 de->td_namelen); 942 de->td_namelen = (uint16_t)namelen; 943 memcpy(newname, tcnp->cn_nameptr, namelen); 944 de->td_name = newname; 945 newname = NULL; 946 947 fnode->tn_status |= TMPFS_NODE_CHANGED; 948 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 949 } 950 951 /* Notify listeners of tdvp about the change in the directory (either 952 * because a new entry was added or because one was removed) and 953 * listeners of fvp about the rename. */ 954 VN_KNOTE(tdvp, NOTE_WRITE); 955 VN_KNOTE(fvp, NOTE_RENAME); 956 957 error = 0; 958 959 out: 960 if (fdnode != tdnode) 961 VOP_UNLOCK(fdvp, 0); 962 963 out_unlocked: 964 /* Release target nodes. */ 965 if (tdvp == tvp) 966 vrele(tdvp); 967 else 968 vput(tdvp); 969 if (tvp != NULL) 970 vput(tvp); 971 972 /* Release source nodes. */ 973 vrele(fdvp); 974 vrele(fvp); 975 976 if (newname != NULL) 977 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 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 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1005 1006 int error; 1007 struct tmpfs_dirent *de; 1008 struct tmpfs_mount *tmp; 1009 struct tmpfs_node *dnode; 1010 struct tmpfs_node *node; 1011 1012 KASSERT(VOP_ISLOCKED(dvp)); 1013 KASSERT(VOP_ISLOCKED(vp)); 1014 1015 tmp = VFS_TO_TMPFS(dvp->v_mount); 1016 dnode = VP_TO_TMPFS_DIR(dvp); 1017 node = VP_TO_TMPFS_DIR(vp); 1018 error = 0; 1019 1020 /* Directories with more than two entries ('.' and '..') cannot be 1021 * removed. */ 1022 if (node->tn_size > 0) { 1023 error = ENOTEMPTY; 1024 goto out; 1025 } 1026 1027 /* This invariant holds only if we are not trying to remove "..". 1028 * We checked for that above so this is safe now. */ 1029 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1030 1031 /* Get the directory entry associated with node (vp). */ 1032 de = tmpfs_dir_lookup(dnode, cnp); 1033 KASSERT(de); 1034 KASSERT(de->td_node == node); 1035 1036 /* Check flags to see if we are allowed to remove the directory. */ 1037 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1038 error = EPERM; 1039 goto out; 1040 } 1041 1042 /* Detach the directory entry from the directory (dnode). */ 1043 tmpfs_dir_detach(dvp, de); 1044 1045 node->tn_links--; 1046 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1047 TMPFS_NODE_MODIFIED; 1048 node->tn_spec.tn_dir.tn_parent->tn_links--; 1049 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1050 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1051 1052 /* Release the parent. */ 1053 cache_purge(dvp); /* XXX Is this needed? */ 1054 1055 /* Free the directory entry we just deleted. Note that the node 1056 * referred by it will not be removed until the vnode is really 1057 * reclaimed. */ 1058 tmpfs_free_dirent(tmp, de, true); 1059 1060 KASSERT(node->tn_links == 0); 1061 out: 1062 /* Release the nodes. */ 1063 vput(dvp); 1064 vput(vp); 1065 PNBUF_PUT(cnp->cn_pnbuf); 1066 1067 return error; 1068 } 1069 1070 /* --------------------------------------------------------------------- */ 1071 1072 int 1073 tmpfs_symlink(void *v) 1074 { 1075 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1076 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1077 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1078 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1079 char *target = ((struct vop_symlink_args *)v)->a_target; 1080 1081 KASSERT(vap->va_type == VLNK); 1082 1083 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1084 } 1085 1086 /* --------------------------------------------------------------------- */ 1087 1088 int 1089 tmpfs_readdir(void *v) 1090 { 1091 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1092 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1093 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1094 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1095 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1096 1097 int error; 1098 off_t startoff; 1099 off_t cnt; 1100 struct tmpfs_node *node; 1101 1102 KASSERT(VOP_ISLOCKED(vp)); 1103 1104 /* This operation only makes sense on directory nodes. */ 1105 if (vp->v_type != VDIR) { 1106 error = ENOTDIR; 1107 goto out; 1108 } 1109 1110 node = VP_TO_TMPFS_DIR(vp); 1111 1112 startoff = uio->uio_offset; 1113 1114 cnt = 0; 1115 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1116 error = tmpfs_dir_getdotdent(node, uio); 1117 if (error == -1) { 1118 error = 0; 1119 goto outok; 1120 } else if (error != 0) 1121 goto outok; 1122 cnt++; 1123 } 1124 1125 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1126 error = tmpfs_dir_getdotdotdent(node, uio); 1127 if (error == -1) { 1128 error = 0; 1129 goto outok; 1130 } else if (error != 0) 1131 goto outok; 1132 cnt++; 1133 } 1134 1135 error = tmpfs_dir_getdents(node, uio, &cnt); 1136 if (error == -1) 1137 error = 0; 1138 KASSERT(error >= 0); 1139 1140 outok: 1141 /* This label assumes that startoff has been 1142 * initialized. If the compiler didn't spit out warnings, we'd 1143 * simply make this one be 'out' and drop 'outok'. */ 1144 1145 if (eofflag != NULL) 1146 *eofflag = 1147 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1148 1149 /* Update NFS-related variables. */ 1150 if (error == 0 && cookies != NULL && ncookies != NULL) { 1151 off_t i; 1152 off_t off = startoff; 1153 struct tmpfs_dirent *de = NULL; 1154 1155 *ncookies = cnt; 1156 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1157 1158 for (i = 0; i < cnt; i++) { 1159 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1160 if (off == TMPFS_DIRCOOKIE_DOT) { 1161 off = TMPFS_DIRCOOKIE_DOTDOT; 1162 } else { 1163 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1164 de = TAILQ_FIRST(&node->tn_spec. 1165 tn_dir.tn_dir); 1166 } else if (de != NULL) { 1167 de = TAILQ_NEXT(de, td_entries); 1168 } else { 1169 de = tmpfs_dir_lookupbycookie(node, 1170 off); 1171 KASSERT(de != NULL); 1172 de = TAILQ_NEXT(de, td_entries); 1173 } 1174 if (de == NULL) { 1175 off = TMPFS_DIRCOOKIE_EOF; 1176 } else { 1177 off = tmpfs_dircookie(de); 1178 } 1179 } 1180 1181 (*cookies)[i] = off; 1182 } 1183 KASSERT(uio->uio_offset == off); 1184 } 1185 1186 out: 1187 KASSERT(VOP_ISLOCKED(vp)); 1188 1189 return error; 1190 } 1191 1192 /* --------------------------------------------------------------------- */ 1193 1194 int 1195 tmpfs_readlink(void *v) 1196 { 1197 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1198 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1199 1200 int error; 1201 struct tmpfs_node *node; 1202 1203 KASSERT(VOP_ISLOCKED(vp)); 1204 KASSERT(uio->uio_offset == 0); 1205 KASSERT(vp->v_type == VLNK); 1206 1207 node = VP_TO_TMPFS_NODE(vp); 1208 1209 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1210 MIN(node->tn_size, uio->uio_resid), uio); 1211 node->tn_status |= TMPFS_NODE_ACCESSED; 1212 1213 KASSERT(VOP_ISLOCKED(vp)); 1214 1215 return error; 1216 } 1217 1218 /* --------------------------------------------------------------------- */ 1219 1220 int 1221 tmpfs_inactive(void *v) 1222 { 1223 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1224 1225 struct tmpfs_node *node; 1226 1227 KASSERT(VOP_ISLOCKED(vp)); 1228 1229 node = VP_TO_TMPFS_NODE(vp); 1230 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1231 VOP_UNLOCK(vp, 0); 1232 1233 return 0; 1234 } 1235 1236 /* --------------------------------------------------------------------- */ 1237 1238 int 1239 tmpfs_reclaim(void *v) 1240 { 1241 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1242 1243 struct tmpfs_mount *tmp; 1244 struct tmpfs_node *node; 1245 1246 node = VP_TO_TMPFS_NODE(vp); 1247 tmp = VFS_TO_TMPFS(vp->v_mount); 1248 1249 cache_purge(vp); 1250 tmpfs_free_vp(vp); 1251 1252 /* If the node referenced by this vnode was deleted by the user, 1253 * we must free its associated data structures (now that the vnode 1254 * is being reclaimed). */ 1255 if (node->tn_links == 0) 1256 tmpfs_free_node(tmp, node); 1257 1258 KASSERT(vp->v_data == NULL); 1259 1260 return 0; 1261 } 1262 1263 /* --------------------------------------------------------------------- */ 1264 1265 int 1266 tmpfs_print(void *v) 1267 { 1268 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1269 1270 struct tmpfs_node *node; 1271 1272 node = VP_TO_TMPFS_NODE(vp); 1273 1274 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1275 node, node->tn_flags, node->tn_links); 1276 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1277 ", status 0x%x\n", 1278 node->tn_mode, node->tn_uid, node->tn_gid, 1279 (uintmax_t)node->tn_size, node->tn_status); 1280 if (vp->v_type == VFIFO) 1281 fifo_printinfo(vp); 1282 printf("\n"); 1283 1284 return 0; 1285 } 1286 1287 /* --------------------------------------------------------------------- */ 1288 1289 int 1290 tmpfs_pathconf(void *v) 1291 { 1292 int name = ((struct vop_pathconf_args *)v)->a_name; 1293 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1294 1295 int error; 1296 1297 error = 0; 1298 1299 switch (name) { 1300 case _PC_LINK_MAX: 1301 *retval = LINK_MAX; 1302 break; 1303 1304 case _PC_NAME_MAX: 1305 *retval = NAME_MAX; 1306 break; 1307 1308 case _PC_PATH_MAX: 1309 *retval = PATH_MAX; 1310 break; 1311 1312 case _PC_PIPE_BUF: 1313 *retval = PIPE_BUF; 1314 break; 1315 1316 case _PC_CHOWN_RESTRICTED: 1317 *retval = 1; 1318 break; 1319 1320 case _PC_NO_TRUNC: 1321 *retval = 1; 1322 break; 1323 1324 case _PC_SYNC_IO: 1325 *retval = 1; 1326 break; 1327 1328 case _PC_FILESIZEBITS: 1329 *retval = 0; /* XXX Don't know which value should I return. */ 1330 break; 1331 1332 default: 1333 error = EINVAL; 1334 } 1335 1336 return error; 1337 } 1338 1339 /* --------------------------------------------------------------------- */ 1340 1341 int 1342 tmpfs_advlock(void *v) 1343 { 1344 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1345 1346 struct tmpfs_node *node; 1347 1348 node = VP_TO_TMPFS_NODE(vp); 1349 1350 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1351 } 1352 1353 /* --------------------------------------------------------------------- */ 1354 1355 int 1356 tmpfs_getpages(void *v) 1357 { 1358 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1359 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1360 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1361 int *count = ((struct vop_getpages_args *)v)->a_count; 1362 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1363 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1364 int advice = ((struct vop_getpages_args *)v)->a_advice; 1365 int flags = ((struct vop_getpages_args *)v)->a_flags; 1366 1367 int error; 1368 int i; 1369 struct tmpfs_node *node; 1370 struct uvm_object *uobj; 1371 int npages = *count; 1372 1373 KASSERT(vp->v_type == VREG); 1374 KASSERT(mutex_owned(&vp->v_interlock)); 1375 1376 node = VP_TO_TMPFS_NODE(vp); 1377 uobj = node->tn_spec.tn_reg.tn_aobj; 1378 1379 /* We currently don't rely on PGO_PASTEOF. */ 1380 1381 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1382 if ((flags & PGO_LOCKED) == 0) 1383 mutex_exit(&vp->v_interlock); 1384 return EINVAL; 1385 } 1386 1387 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1388 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1389 } 1390 1391 if ((flags & PGO_LOCKED) != 0) 1392 return EBUSY; 1393 1394 if ((flags & PGO_NOTIMESTAMP) == 0) { 1395 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1396 node->tn_status |= TMPFS_NODE_ACCESSED; 1397 1398 if ((access_type & VM_PROT_WRITE) != 0) 1399 node->tn_status |= TMPFS_NODE_MODIFIED; 1400 } 1401 1402 mutex_exit(&vp->v_interlock); 1403 1404 /* 1405 * Make sure that the array on which we will store the 1406 * gotten pages is clean. Otherwise uao_get (pointed to by 1407 * the pgo_get below) gets confused and does not return the 1408 * appropriate pages. 1409 * 1410 * XXX This shall be revisited when kern/32166 is addressed 1411 * because the loop to clean m[i] will most likely be redundant 1412 * as well as the PGO_ALLPAGES flag. 1413 */ 1414 if (m != NULL) 1415 for (i = 0; i < npages; i++) 1416 m[i] = NULL; 1417 mutex_enter(&uobj->vmobjlock); 1418 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1419 access_type, advice, flags | PGO_ALLPAGES); 1420 #if defined(DEBUG) 1421 { 1422 /* Make sure that all the pages we return are valid. */ 1423 int dbgi; 1424 if (error == 0 && m != NULL) 1425 for (dbgi = 0; dbgi < npages; dbgi++) 1426 KASSERT(m[dbgi] != NULL); 1427 } 1428 #endif 1429 1430 return error; 1431 } 1432 1433 /* --------------------------------------------------------------------- */ 1434 1435 int 1436 tmpfs_putpages(void *v) 1437 { 1438 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1439 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1440 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1441 int flags = ((struct vop_putpages_args *)v)->a_flags; 1442 1443 int error; 1444 struct tmpfs_node *node; 1445 struct uvm_object *uobj; 1446 1447 KASSERT(mutex_owned(&vp->v_interlock)); 1448 1449 node = VP_TO_TMPFS_NODE(vp); 1450 1451 if (vp->v_type != VREG) { 1452 mutex_exit(&vp->v_interlock); 1453 return 0; 1454 } 1455 1456 uobj = node->tn_spec.tn_reg.tn_aobj; 1457 mutex_exit(&vp->v_interlock); 1458 1459 mutex_enter(&uobj->vmobjlock); 1460 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1461 1462 /* XXX mtime */ 1463 1464 return error; 1465 } 1466
Indexes created Tue Sep 23 07:09:52 GMT 2025