tmpfs_vnops.c revision 1.51.6.2
1 /* $NetBSD: tmpfs_vnops.c,v 1.51.6.2 2009/03/24 20:22:44 snj 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 1.51.6.2 2009/03/24 20:22:44 snj 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 } else 223 de = NULL; 224 225 /* Allocate a new vnode on the matching entry. */ 226 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 227 } 228 } 229 230 /* Store the result of this lookup in the cache. Avoid this if the 231 * request was for creation, as it does not improve timings on 232 * emprical tests. */ 233 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 234 (cnp->cn_flags & ISDOTDOT) == 0) 235 cache_enter(dvp, *vpp, cnp); 236 237 out: 238 /* If there were no errors, *vpp cannot be null and it must be 239 * locked. */ 240 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 241 242 /* dvp must always be locked. */ 243 KASSERT(VOP_ISLOCKED(dvp)); 244 245 return error; 246 } 247 248 /* --------------------------------------------------------------------- */ 249 250 int 251 tmpfs_create(void *v) 252 { 253 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 254 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 255 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 256 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 257 258 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 259 260 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 261 } 262 /* --------------------------------------------------------------------- */ 263 264 int 265 tmpfs_mknod(void *v) 266 { 267 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 268 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 269 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 270 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 271 272 if (vap->va_type != VBLK && vap->va_type != VCHR && 273 vap->va_type != VFIFO) { 274 vput(dvp); 275 return EINVAL; 276 } 277 278 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 279 } 280 281 /* --------------------------------------------------------------------- */ 282 283 int 284 tmpfs_open(void *v) 285 { 286 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 287 int mode = ((struct vop_open_args *)v)->a_mode; 288 289 int error; 290 struct tmpfs_node *node; 291 292 KASSERT(VOP_ISLOCKED(vp)); 293 294 node = VP_TO_TMPFS_NODE(vp); 295 296 /* The file is still active but all its names have been removed 297 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 298 * it is about to die. */ 299 if (node->tn_links < 1) { 300 error = ENOENT; 301 goto out; 302 } 303 304 /* If the file is marked append-only, deny write requests. */ 305 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 306 error = EPERM; 307 else 308 error = 0; 309 310 out: 311 KASSERT(VOP_ISLOCKED(vp)); 312 313 return error; 314 } 315 316 /* --------------------------------------------------------------------- */ 317 318 int 319 tmpfs_close(void *v) 320 { 321 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 322 323 struct tmpfs_node *node; 324 325 KASSERT(VOP_ISLOCKED(vp)); 326 327 node = VP_TO_TMPFS_NODE(vp); 328 329 if (node->tn_links > 0) { 330 /* Update node times. No need to do it if the node has 331 * been deleted, because it will vanish after we return. */ 332 tmpfs_update(vp, NULL, NULL, NULL, UPDATE_CLOSE); 333 } 334 335 return 0; 336 } 337 338 /* --------------------------------------------------------------------- */ 339 340 int 341 tmpfs_access(void *v) 342 { 343 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 344 int mode = ((struct vop_access_args *)v)->a_mode; 345 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 346 347 int error; 348 struct tmpfs_node *node; 349 350 KASSERT(VOP_ISLOCKED(vp)); 351 352 node = VP_TO_TMPFS_NODE(vp); 353 354 switch (vp->v_type) { 355 case VDIR: 356 /* FALLTHROUGH */ 357 case VLNK: 358 /* FALLTHROUGH */ 359 case VREG: 360 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 361 error = EROFS; 362 goto out; 363 } 364 break; 365 366 case VBLK: 367 /* FALLTHROUGH */ 368 case VCHR: 369 /* FALLTHROUGH */ 370 case VSOCK: 371 /* FALLTHROUGH */ 372 case VFIFO: 373 break; 374 375 default: 376 error = EINVAL; 377 goto out; 378 } 379 380 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 381 error = EPERM; 382 goto out; 383 } 384 385 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 386 node->tn_gid, mode, cred); 387 388 out: 389 KASSERT(VOP_ISLOCKED(vp)); 390 391 return error; 392 } 393 394 /* --------------------------------------------------------------------- */ 395 396 int 397 tmpfs_getattr(void *v) 398 { 399 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 400 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 401 402 struct tmpfs_node *node; 403 404 node = VP_TO_TMPFS_NODE(vp); 405 406 VATTR_NULL(vap); 407 408 tmpfs_itimes(vp, NULL, NULL, NULL); 409 410 vap->va_type = vp->v_type; 411 vap->va_mode = node->tn_mode; 412 vap->va_nlink = node->tn_links; 413 vap->va_uid = node->tn_uid; 414 vap->va_gid = node->tn_gid; 415 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 416 vap->va_fileid = node->tn_id; 417 vap->va_size = node->tn_size; 418 vap->va_blocksize = PAGE_SIZE; 419 vap->va_atime = node->tn_atime; 420 vap->va_mtime = node->tn_mtime; 421 vap->va_ctime = node->tn_ctime; 422 vap->va_birthtime = node->tn_birthtime; 423 vap->va_gen = node->tn_gen; 424 vap->va_flags = node->tn_flags; 425 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 426 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 427 vap->va_bytes = round_page(node->tn_size); 428 vap->va_filerev = VNOVAL; 429 vap->va_vaflags = 0; 430 vap->va_spare = VNOVAL; /* XXX */ 431 432 return 0; 433 } 434 435 /* --------------------------------------------------------------------- */ 436 437 #define GOODTIME(tv) ((tv)->tv_sec != VNOVAL || (tv)->tv_nsec != VNOVAL) 438 /* XXX Should this operation be atomic? I think it should, but code in 439 * XXX other places (e.g., ufs) doesn't seem to be... */ 440 int 441 tmpfs_setattr(void *v) 442 { 443 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 444 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 445 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 446 struct lwp *l = curlwp; 447 448 int error; 449 450 KASSERT(VOP_ISLOCKED(vp)); 451 452 error = 0; 453 454 /* Abort if any unsettable attribute is given. */ 455 if (vap->va_type != VNON || 456 vap->va_nlink != VNOVAL || 457 vap->va_fsid != VNOVAL || 458 vap->va_fileid != VNOVAL || 459 vap->va_blocksize != VNOVAL || 460 GOODTIME(&vap->va_ctime) || 461 vap->va_gen != VNOVAL || 462 vap->va_rdev != VNOVAL || 463 vap->va_bytes != VNOVAL) 464 error = EINVAL; 465 466 if (error == 0 && (vap->va_flags != VNOVAL)) 467 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 468 469 if (error == 0 && (vap->va_size != VNOVAL)) 470 error = tmpfs_chsize(vp, vap->va_size, cred, l); 471 472 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 473 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 474 475 if (error == 0 && (vap->va_mode != VNOVAL)) 476 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 477 478 if (error == 0 && (GOODTIME(&vap->va_atime) || GOODTIME(&vap->va_mtime) 479 || GOODTIME(&vap->va_birthtime))) 480 if ((error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 481 &vap->va_birthtime, vap->va_vaflags, cred, l)) == 0) 482 return 0; 483 484 /* Update the node times. We give preference to the error codes 485 * generated by this function rather than the ones that may arise 486 * from tmpfs_update. */ 487 tmpfs_update(vp, NULL, NULL, NULL, 0); 488 489 KASSERT(VOP_ISLOCKED(vp)); 490 491 return error; 492 } 493 494 /* --------------------------------------------------------------------- */ 495 496 int 497 tmpfs_read(void *v) 498 { 499 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 500 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 501 502 int error; 503 int flags; 504 struct tmpfs_node *node; 505 struct uvm_object *uobj; 506 507 KASSERT(VOP_ISLOCKED(vp)); 508 509 node = VP_TO_TMPFS_NODE(vp); 510 511 if (vp->v_type != VREG) { 512 error = EISDIR; 513 goto out; 514 } 515 516 if (uio->uio_offset < 0) { 517 error = EINVAL; 518 goto out; 519 } 520 521 node->tn_status |= TMPFS_NODE_ACCESSED; 522 523 uobj = node->tn_spec.tn_reg.tn_aobj; 524 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 525 error = 0; 526 while (error == 0 && uio->uio_resid > 0) { 527 vsize_t len; 528 void *win; 529 530 if (node->tn_size <= uio->uio_offset) 531 break; 532 533 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 534 if (len == 0) 535 break; 536 537 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 538 UBC_READ); 539 error = uiomove(win, len, uio); 540 ubc_release(win, flags); 541 } 542 543 out: 544 KASSERT(VOP_ISLOCKED(vp)); 545 546 return error; 547 } 548 549 /* --------------------------------------------------------------------- */ 550 551 int 552 tmpfs_write(void *v) 553 { 554 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 555 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 556 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 557 558 bool extended; 559 int error; 560 int flags; 561 off_t oldsize; 562 struct tmpfs_node *node; 563 struct uvm_object *uobj; 564 565 KASSERT(VOP_ISLOCKED(vp)); 566 567 node = VP_TO_TMPFS_NODE(vp); 568 oldsize = node->tn_size; 569 570 if (uio->uio_offset < 0 || vp->v_type != VREG) { 571 error = EINVAL; 572 goto out; 573 } 574 575 if (uio->uio_resid == 0) { 576 error = 0; 577 goto out; 578 } 579 580 if (ioflag & IO_APPEND) 581 uio->uio_offset = node->tn_size; 582 583 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 584 if (extended) { 585 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 586 if (error != 0) 587 goto out; 588 } 589 590 uobj = node->tn_spec.tn_reg.tn_aobj; 591 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 592 error = 0; 593 while (error == 0 && uio->uio_resid > 0) { 594 vsize_t len; 595 void *win; 596 597 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 598 if (len == 0) 599 break; 600 601 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 602 UBC_WRITE); 603 error = uiomove(win, len, uio); 604 ubc_release(win, flags); 605 } 606 607 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 608 (extended ? TMPFS_NODE_CHANGED : 0); 609 610 if (error != 0) 611 (void)tmpfs_reg_resize(vp, oldsize); 612 613 VN_KNOTE(vp, NOTE_WRITE); 614 615 out: 616 KASSERT(VOP_ISLOCKED(vp)); 617 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 618 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 619 620 return error; 621 } 622 623 /* --------------------------------------------------------------------- */ 624 625 int 626 tmpfs_fsync(void *v) 627 { 628 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 629 630 KASSERT(VOP_ISLOCKED(vp)); 631 632 tmpfs_update(vp, NULL, NULL, NULL, 0); 633 634 return 0; 635 } 636 637 /* --------------------------------------------------------------------- */ 638 639 int 640 tmpfs_remove(void *v) 641 { 642 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 643 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 644 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 645 646 int error; 647 struct tmpfs_dirent *de; 648 struct tmpfs_mount *tmp; 649 struct tmpfs_node *dnode; 650 struct tmpfs_node *node; 651 652 KASSERT(VOP_ISLOCKED(dvp)); 653 KASSERT(VOP_ISLOCKED(vp)); 654 655 if (vp->v_type == VDIR) { 656 error = EPERM; 657 goto out; 658 } 659 660 dnode = VP_TO_TMPFS_DIR(dvp); 661 node = VP_TO_TMPFS_NODE(vp); 662 tmp = VFS_TO_TMPFS(vp->v_mount); 663 de = tmpfs_dir_lookup(dnode, cnp); 664 if (de == NULL) { 665 error = ENOENT; 666 goto out; 667 } 668 KASSERT(de->td_node == node); 669 670 /* Files marked as immutable or append-only cannot be deleted. */ 671 if (node->tn_flags & (IMMUTABLE | APPEND)) { 672 error = EPERM; 673 goto out; 674 } 675 676 /* Remove the entry from the directory; as it is a file, we do not 677 * have to change the number of hard links of the directory. */ 678 tmpfs_dir_detach(dvp, de); 679 680 /* Free the directory entry we just deleted. Note that the node 681 * referred by it will not be removed until the vnode is really 682 * reclaimed. */ 683 tmpfs_free_dirent(tmp, de, true); 684 685 error = 0; 686 687 out: 688 vput(vp); 689 if (dvp == vp) 690 vrele(dvp); 691 else 692 vput(dvp); 693 694 return error; 695 } 696 697 /* --------------------------------------------------------------------- */ 698 699 int 700 tmpfs_link(void *v) 701 { 702 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 703 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 704 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 705 706 int error; 707 struct tmpfs_dirent *de; 708 struct tmpfs_node *dnode; 709 struct tmpfs_node *node; 710 711 KASSERT(VOP_ISLOCKED(dvp)); 712 KASSERT(cnp->cn_flags & HASBUF); 713 KASSERT(dvp != vp); /* XXX When can this be false? */ 714 715 dnode = VP_TO_TMPFS_DIR(dvp); 716 node = VP_TO_TMPFS_NODE(vp); 717 718 /* Lock vp because we will need to run tmpfs_update over it, which 719 * needs the vnode to be locked. */ 720 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 721 if (error != 0) 722 goto out1; 723 724 /* XXX: Why aren't the following two tests done by the caller? */ 725 726 /* Hard links of directories are forbidden. */ 727 if (vp->v_type == VDIR) { 728 error = EPERM; 729 goto out; 730 } 731 732 /* Cannot create cross-device links. */ 733 if (dvp->v_mount != vp->v_mount) { 734 error = EXDEV; 735 goto out; 736 } 737 738 /* Ensure that we do not overflow the maximum number of links imposed 739 * by the system. */ 740 KASSERT(node->tn_links <= LINK_MAX); 741 if (node->tn_links == LINK_MAX) { 742 error = EMLINK; 743 goto out; 744 } 745 746 /* We cannot create links of files marked immutable or append-only. */ 747 if (node->tn_flags & (IMMUTABLE | APPEND)) { 748 error = EPERM; 749 goto out; 750 } 751 752 /* Allocate a new directory entry to represent the node. */ 753 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 754 cnp->cn_nameptr, cnp->cn_namelen, &de); 755 if (error != 0) 756 goto out; 757 758 /* Insert the new directory entry into the appropriate directory. */ 759 tmpfs_dir_attach(dvp, de); 760 761 /* vp link count has changed, so update node times. */ 762 node->tn_status |= TMPFS_NODE_CHANGED; 763 tmpfs_update(vp, NULL, NULL, NULL, 0); 764 765 error = 0; 766 767 out: 768 VOP_UNLOCK(vp, 0); 769 out1: 770 PNBUF_PUT(cnp->cn_pnbuf); 771 772 vput(dvp); 773 774 return error; 775 } 776 777 /* --------------------------------------------------------------------- */ 778 779 int 780 tmpfs_rename(void *v) 781 { 782 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 783 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 784 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 785 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 786 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 787 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 788 789 char *newname; 790 int error; 791 struct tmpfs_dirent *de, *de2; 792 struct tmpfs_mount *tmp; 793 struct tmpfs_node *fdnode; 794 struct tmpfs_node *fnode; 795 struct tmpfs_node *tnode; 796 struct tmpfs_node *tdnode; 797 size_t namelen; 798 799 KASSERT(VOP_ISLOCKED(tdvp)); 800 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 801 KASSERT(fcnp->cn_flags & HASBUF); 802 KASSERT(tcnp->cn_flags & HASBUF); 803 804 newname = NULL; 805 namelen = 0; 806 tmp = NULL; 807 808 /* Disallow cross-device renames. */ 809 if (fvp->v_mount != tdvp->v_mount || 810 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 811 error = EXDEV; 812 goto out_unlocked; 813 } 814 815 fnode = VP_TO_TMPFS_NODE(fvp); 816 fdnode = VP_TO_TMPFS_DIR(fdvp); 817 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 818 tdnode = VP_TO_TMPFS_DIR(tdvp); 819 tmp = VFS_TO_TMPFS(tdvp->v_mount); 820 821 if (fdvp == tvp) { 822 error = 0; 823 goto out_unlocked; 824 } 825 826 /* If we need to move the directory between entries, lock the 827 * source so that we can safely operate on it. */ 828 829 /* XXX: this is a potential locking order violation! */ 830 if (fdnode != tdnode) { 831 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 832 if (error != 0) 833 goto out_unlocked; 834 } 835 836 de = tmpfs_dir_lookup(fdnode, fcnp); 837 if (de == NULL) { 838 error = ENOENT; 839 goto out; 840 } 841 KASSERT(de->td_node == fnode); 842 843 /* If source and target are the same file, there is nothing to do. */ 844 if (fvp == tvp) { 845 error = 0; 846 goto out; 847 } 848 849 /* Avoid manipulating '.' and '..' entries. */ 850 if (de == NULL) { 851 KASSERT(fvp->v_type == VDIR); 852 error = EINVAL; 853 goto out; 854 } 855 KASSERT(de->td_node == fnode); 856 857 /* If replacing an existing entry, ensure we can do the operation. */ 858 if (tvp != NULL) { 859 KASSERT(tnode != NULL); 860 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 861 if (tnode->tn_size > 0) { 862 error = ENOTEMPTY; 863 goto out; 864 } 865 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 866 error = ENOTDIR; 867 goto out; 868 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 869 error = EISDIR; 870 goto out; 871 } else { 872 KASSERT(fnode->tn_type != VDIR && 873 tnode->tn_type != VDIR); 874 } 875 } 876 877 /* Ensure that we have enough memory to hold the new name, if it 878 * has to be changed. */ 879 namelen = tcnp->cn_namelen; 880 if (fcnp->cn_namelen != tcnp->cn_namelen || 881 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 882 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 883 if (newname == NULL) { 884 error = ENOSPC; 885 goto out; 886 } 887 } 888 889 /* If the node is being moved to another directory, we have to do 890 * the move. */ 891 if (fdnode != tdnode) { 892 /* In case we are moving a directory, we have to adjust its 893 * parent to point to the new parent. */ 894 if (de->td_node->tn_type == VDIR) { 895 struct tmpfs_node *n; 896 897 /* Ensure the target directory is not a child of the 898 * directory being moved. Otherwise, we'd end up 899 * with stale nodes. */ 900 n = tdnode; 901 while (n != n->tn_spec.tn_dir.tn_parent) { 902 if (n == fnode) { 903 error = EINVAL; 904 goto out; 905 } 906 n = n->tn_spec.tn_dir.tn_parent; 907 } 908 909 /* Adjust the parent pointer. */ 910 TMPFS_VALIDATE_DIR(fnode); 911 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 912 913 /* As a result of changing the target of the '..' 914 * entry, the link count of the source and target 915 * directories has to be adjusted. */ 916 fdnode->tn_links--; 917 tdnode->tn_links++; 918 } 919 920 /* Do the move: just remove the entry from the source directory 921 * and insert it into the target one. */ 922 tmpfs_dir_detach(fdvp, de); 923 tmpfs_dir_attach(tdvp, de); 924 925 /* Notify listeners of fdvp about the change in the directory. 926 * We can do it at this point because we aren't touching fdvp 927 * any more below. */ 928 VN_KNOTE(fdvp, NOTE_WRITE); 929 } 930 931 /* If we are overwriting an entry, we have to remove the old one 932 * from the target directory. */ 933 if (tvp != NULL) { 934 KASSERT(tnode != NULL); 935 936 /* Remove the old entry from the target directory. 937 * Note! This relies on tmpfs_dir_attach() putting the new 938 * node on the end of the target's node list. */ 939 de2 = tmpfs_dir_lookup(tdnode, tcnp); 940 KASSERT(de2 != NULL); 941 KASSERT(de2->td_node == tnode); 942 tmpfs_dir_detach(tdvp, de2); 943 944 /* Free the directory entry we just deleted. Note that the 945 * node referred by it will not be removed until the vnode is 946 * really reclaimed. */ 947 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 948 } 949 950 /* If the name has changed, we need to make it effective by changing 951 * it in the directory entry. */ 952 if (newname != NULL) { 953 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 954 KASSERT(tcnp->cn_namelen < 0xffff); 955 956 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 957 de->td_namelen); 958 de->td_namelen = (uint16_t)namelen; 959 memcpy(newname, tcnp->cn_nameptr, namelen); 960 de->td_name = newname; 961 newname = NULL; 962 963 fnode->tn_status |= TMPFS_NODE_CHANGED; 964 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 965 } 966 967 /* Notify listeners of tdvp about the change in the directory (either 968 * because a new entry was added or because one was removed) and 969 * listeners of fvp about the rename. */ 970 VN_KNOTE(tdvp, NOTE_WRITE); 971 VN_KNOTE(fvp, NOTE_RENAME); 972 973 error = 0; 974 975 out: 976 if (fdnode != tdnode) 977 VOP_UNLOCK(fdvp, 0); 978 979 out_unlocked: 980 /* Release target nodes. */ 981 if (tdvp == tvp) 982 vrele(tdvp); 983 else 984 vput(tdvp); 985 if (tvp != NULL) 986 vput(tvp); 987 988 /* Release source nodes. */ 989 vrele(fdvp); 990 vrele(fvp); 991 992 if (newname != NULL) 993 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 994 995 return error; 996 } 997 998 /* --------------------------------------------------------------------- */ 999 1000 int 1001 tmpfs_mkdir(void *v) 1002 { 1003 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1004 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1005 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1006 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1007 1008 KASSERT(vap->va_type == VDIR); 1009 1010 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1011 } 1012 1013 /* --------------------------------------------------------------------- */ 1014 1015 int 1016 tmpfs_rmdir(void *v) 1017 { 1018 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1019 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1020 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1021 1022 int error; 1023 struct tmpfs_dirent *de; 1024 struct tmpfs_mount *tmp; 1025 struct tmpfs_node *dnode; 1026 struct tmpfs_node *node; 1027 1028 KASSERT(VOP_ISLOCKED(dvp)); 1029 KASSERT(VOP_ISLOCKED(vp)); 1030 1031 tmp = VFS_TO_TMPFS(dvp->v_mount); 1032 dnode = VP_TO_TMPFS_DIR(dvp); 1033 node = VP_TO_TMPFS_DIR(vp); 1034 error = 0; 1035 1036 /* Directories with more than two entries ('.' and '..') cannot be 1037 * removed. */ 1038 if (node->tn_size > 0) { 1039 error = ENOTEMPTY; 1040 goto out; 1041 } 1042 1043 /* This invariant holds only if we are not trying to remove "..". 1044 * We checked for that above so this is safe now. */ 1045 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1046 1047 /* Get the directory entry associated with node (vp). */ 1048 de = tmpfs_dir_lookup(dnode, cnp); 1049 if (de == NULL) { 1050 error = ENOENT; 1051 goto out; 1052 } 1053 KASSERT(de->td_node == node); 1054 1055 /* Check flags to see if we are allowed to remove the directory. */ 1056 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1057 error = EPERM; 1058 goto out; 1059 } 1060 1061 /* Detach the directory entry from the directory (dnode). */ 1062 tmpfs_dir_detach(dvp, de); 1063 1064 node->tn_links--; 1065 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1066 TMPFS_NODE_MODIFIED; 1067 node->tn_spec.tn_dir.tn_parent->tn_links--; 1068 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1069 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1070 1071 /* Release the parent. */ 1072 cache_purge(dvp); /* XXX Is this needed? */ 1073 1074 /* Free the directory entry we just deleted. Note that the node 1075 * referred by it will not be removed until the vnode is really 1076 * reclaimed. */ 1077 tmpfs_free_dirent(tmp, de, true); 1078 1079 KASSERT(node->tn_links == 0); 1080 out: 1081 /* Release the nodes. */ 1082 vput(dvp); 1083 vput(vp); 1084 1085 return error; 1086 } 1087 1088 /* --------------------------------------------------------------------- */ 1089 1090 int 1091 tmpfs_symlink(void *v) 1092 { 1093 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1094 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1095 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1096 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1097 char *target = ((struct vop_symlink_args *)v)->a_target; 1098 1099 KASSERT(vap->va_type == VLNK); 1100 1101 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1102 } 1103 1104 /* --------------------------------------------------------------------- */ 1105 1106 int 1107 tmpfs_readdir(void *v) 1108 { 1109 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1110 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1111 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1112 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1113 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1114 1115 int error; 1116 off_t startoff; 1117 off_t cnt; 1118 struct tmpfs_node *node; 1119 1120 KASSERT(VOP_ISLOCKED(vp)); 1121 1122 /* This operation only makes sense on directory nodes. */ 1123 if (vp->v_type != VDIR) { 1124 error = ENOTDIR; 1125 goto out; 1126 } 1127 1128 node = VP_TO_TMPFS_DIR(vp); 1129 1130 startoff = uio->uio_offset; 1131 1132 cnt = 0; 1133 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1134 error = tmpfs_dir_getdotdent(node, uio); 1135 if (error == -1) { 1136 error = 0; 1137 goto outok; 1138 } else if (error != 0) 1139 goto outok; 1140 cnt++; 1141 } 1142 1143 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1144 error = tmpfs_dir_getdotdotdent(node, uio); 1145 if (error == -1) { 1146 error = 0; 1147 goto outok; 1148 } else if (error != 0) 1149 goto outok; 1150 cnt++; 1151 } 1152 1153 error = tmpfs_dir_getdents(node, uio, &cnt); 1154 if (error == -1) 1155 error = 0; 1156 KASSERT(error >= 0); 1157 1158 outok: 1159 /* This label assumes that startoff has been 1160 * initialized. If the compiler didn't spit out warnings, we'd 1161 * simply make this one be 'out' and drop 'outok'. */ 1162 1163 if (eofflag != NULL) 1164 *eofflag = 1165 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1166 1167 /* Update NFS-related variables. */ 1168 if (error == 0 && cookies != NULL && ncookies != NULL) { 1169 off_t i; 1170 off_t off = startoff; 1171 struct tmpfs_dirent *de = NULL; 1172 1173 *ncookies = cnt; 1174 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1175 1176 for (i = 0; i < cnt; i++) { 1177 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1178 if (off == TMPFS_DIRCOOKIE_DOT) { 1179 off = TMPFS_DIRCOOKIE_DOTDOT; 1180 } else { 1181 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1182 de = TAILQ_FIRST(&node->tn_spec. 1183 tn_dir.tn_dir); 1184 } else if (de != NULL) { 1185 de = TAILQ_NEXT(de, td_entries); 1186 } else { 1187 de = tmpfs_dir_lookupbycookie(node, 1188 off); 1189 KASSERT(de != NULL); 1190 de = TAILQ_NEXT(de, td_entries); 1191 } 1192 if (de == NULL) { 1193 off = TMPFS_DIRCOOKIE_EOF; 1194 } else { 1195 off = tmpfs_dircookie(de); 1196 } 1197 } 1198 1199 (*cookies)[i] = off; 1200 } 1201 KASSERT(uio->uio_offset == off); 1202 } 1203 1204 out: 1205 KASSERT(VOP_ISLOCKED(vp)); 1206 1207 return error; 1208 } 1209 1210 /* --------------------------------------------------------------------- */ 1211 1212 int 1213 tmpfs_readlink(void *v) 1214 { 1215 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1216 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1217 1218 int error; 1219 struct tmpfs_node *node; 1220 1221 KASSERT(VOP_ISLOCKED(vp)); 1222 KASSERT(uio->uio_offset == 0); 1223 KASSERT(vp->v_type == VLNK); 1224 1225 node = VP_TO_TMPFS_NODE(vp); 1226 1227 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1228 MIN(node->tn_size, uio->uio_resid), uio); 1229 node->tn_status |= TMPFS_NODE_ACCESSED; 1230 1231 KASSERT(VOP_ISLOCKED(vp)); 1232 1233 return error; 1234 } 1235 1236 /* --------------------------------------------------------------------- */ 1237 1238 int 1239 tmpfs_inactive(void *v) 1240 { 1241 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1242 1243 struct tmpfs_node *node; 1244 1245 KASSERT(VOP_ISLOCKED(vp)); 1246 1247 node = VP_TO_TMPFS_NODE(vp); 1248 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1249 VOP_UNLOCK(vp, 0); 1250 1251 return 0; 1252 } 1253 1254 /* --------------------------------------------------------------------- */ 1255 1256 int 1257 tmpfs_reclaim(void *v) 1258 { 1259 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1260 1261 struct tmpfs_mount *tmp; 1262 struct tmpfs_node *node; 1263 1264 node = VP_TO_TMPFS_NODE(vp); 1265 tmp = VFS_TO_TMPFS(vp->v_mount); 1266 1267 cache_purge(vp); 1268 tmpfs_free_vp(vp); 1269 1270 /* If the node referenced by this vnode was deleted by the user, 1271 * we must free its associated data structures (now that the vnode 1272 * is being reclaimed). */ 1273 if (node->tn_links == 0) 1274 tmpfs_free_node(tmp, node); 1275 1276 KASSERT(vp->v_data == NULL); 1277 1278 return 0; 1279 } 1280 1281 /* --------------------------------------------------------------------- */ 1282 1283 int 1284 tmpfs_print(void *v) 1285 { 1286 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1287 1288 struct tmpfs_node *node; 1289 1290 node = VP_TO_TMPFS_NODE(vp); 1291 1292 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1293 node, node->tn_flags, node->tn_links); 1294 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1295 ", status 0x%x\n", 1296 node->tn_mode, node->tn_uid, node->tn_gid, 1297 (uintmax_t)node->tn_size, node->tn_status); 1298 if (vp->v_type == VFIFO) 1299 fifo_printinfo(vp); 1300 printf("\n"); 1301 1302 return 0; 1303 } 1304 1305 /* --------------------------------------------------------------------- */ 1306 1307 int 1308 tmpfs_pathconf(void *v) 1309 { 1310 int name = ((struct vop_pathconf_args *)v)->a_name; 1311 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1312 1313 int error; 1314 1315 error = 0; 1316 1317 switch (name) { 1318 case _PC_LINK_MAX: 1319 *retval = LINK_MAX; 1320 break; 1321 1322 case _PC_NAME_MAX: 1323 *retval = NAME_MAX; 1324 break; 1325 1326 case _PC_PATH_MAX: 1327 *retval = PATH_MAX; 1328 break; 1329 1330 case _PC_PIPE_BUF: 1331 *retval = PIPE_BUF; 1332 break; 1333 1334 case _PC_CHOWN_RESTRICTED: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_NO_TRUNC: 1339 *retval = 1; 1340 break; 1341 1342 case _PC_SYNC_IO: 1343 *retval = 1; 1344 break; 1345 1346 case _PC_FILESIZEBITS: 1347 *retval = 0; /* XXX Don't know which value should I return. */ 1348 break; 1349 1350 default: 1351 error = EINVAL; 1352 } 1353 1354 return error; 1355 } 1356 1357 /* --------------------------------------------------------------------- */ 1358 1359 int 1360 tmpfs_advlock(void *v) 1361 { 1362 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1363 1364 struct tmpfs_node *node; 1365 1366 node = VP_TO_TMPFS_NODE(vp); 1367 1368 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1369 } 1370 1371 /* --------------------------------------------------------------------- */ 1372 1373 int 1374 tmpfs_getpages(void *v) 1375 { 1376 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1377 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1378 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1379 int *count = ((struct vop_getpages_args *)v)->a_count; 1380 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1381 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1382 int advice = ((struct vop_getpages_args *)v)->a_advice; 1383 int flags = ((struct vop_getpages_args *)v)->a_flags; 1384 1385 int error; 1386 int i; 1387 struct tmpfs_node *node; 1388 struct uvm_object *uobj; 1389 int npages = *count; 1390 1391 KASSERT(vp->v_type == VREG); 1392 KASSERT(mutex_owned(&vp->v_interlock)); 1393 1394 node = VP_TO_TMPFS_NODE(vp); 1395 uobj = node->tn_spec.tn_reg.tn_aobj; 1396 1397 /* We currently don't rely on PGO_PASTEOF. */ 1398 1399 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1400 if ((flags & PGO_LOCKED) == 0) 1401 mutex_exit(&vp->v_interlock); 1402 return EINVAL; 1403 } 1404 1405 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1406 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1407 } 1408 1409 if ((flags & PGO_LOCKED) != 0) 1410 return EBUSY; 1411 1412 if ((flags & PGO_NOTIMESTAMP) == 0) { 1413 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1414 node->tn_status |= TMPFS_NODE_ACCESSED; 1415 1416 if ((access_type & VM_PROT_WRITE) != 0) 1417 node->tn_status |= TMPFS_NODE_MODIFIED; 1418 } 1419 1420 mutex_exit(&vp->v_interlock); 1421 1422 /* 1423 * Make sure that the array on which we will store the 1424 * gotten pages is clean. Otherwise uao_get (pointed to by 1425 * the pgo_get below) gets confused and does not return the 1426 * appropriate pages. 1427 * 1428 * XXX This shall be revisited when kern/32166 is addressed 1429 * because the loop to clean m[i] will most likely be redundant 1430 * as well as the PGO_ALLPAGES flag. 1431 */ 1432 if (m != NULL) 1433 for (i = 0; i < npages; i++) 1434 m[i] = NULL; 1435 mutex_enter(&uobj->vmobjlock); 1436 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1437 access_type, advice, flags | PGO_ALLPAGES); 1438 #if defined(DEBUG) 1439 { 1440 /* Make sure that all the pages we return are valid. */ 1441 int dbgi; 1442 if (error == 0 && m != NULL) 1443 for (dbgi = 0; dbgi < npages; dbgi++) 1444 KASSERT(m[dbgi] != NULL); 1445 } 1446 #endif 1447 1448 return error; 1449 } 1450 1451 /* --------------------------------------------------------------------- */ 1452 1453 int 1454 tmpfs_putpages(void *v) 1455 { 1456 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1457 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1458 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1459 int flags = ((struct vop_putpages_args *)v)->a_flags; 1460 1461 int error; 1462 struct tmpfs_node *node; 1463 struct uvm_object *uobj; 1464 1465 KASSERT(mutex_owned(&vp->v_interlock)); 1466 1467 node = VP_TO_TMPFS_NODE(vp); 1468 1469 if (vp->v_type != VREG) { 1470 mutex_exit(&vp->v_interlock); 1471 return 0; 1472 } 1473 1474 uobj = node->tn_spec.tn_reg.tn_aobj; 1475 mutex_exit(&vp->v_interlock); 1476 1477 mutex_enter(&uobj->vmobjlock); 1478 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1479 1480 /* XXX mtime */ 1481 1482 return error; 1483 } 1484
Indexes created Tue Sep 30 20:09:53 GMT 2025