tmpfs_vnops.c revision 1.51.6.5.4.1
1 /* $NetBSD: tmpfs_vnops.c,v 1.51.6.5.4.1 2010/04/21 00:28:14 matt 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 1.51.6.5.4.1 2010/04/21 00:28:14 matt 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; 502 503 int error; 504 int flags; 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 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 526 error = 0; 527 while (error == 0 && uio->uio_resid > 0) { 528 vsize_t len; 529 void *win; 530 531 if (node->tn_size <= uio->uio_offset) 532 break; 533 534 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 535 if (len == 0) 536 break; 537 538 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 539 UBC_READ); 540 error = uiomove(win, len, uio); 541 ubc_release(win, flags); 542 } 543 544 out: 545 KASSERT(VOP_ISLOCKED(vp)); 546 547 return error; 548 } 549 550 /* --------------------------------------------------------------------- */ 551 552 int 553 tmpfs_write(void *v) 554 { 555 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 556 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 557 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 558 559 bool extended; 560 int error; 561 int flags; 562 off_t oldsize; 563 struct tmpfs_node *node; 564 struct uvm_object *uobj; 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 uobj = node->tn_spec.tn_reg.tn_aobj; 592 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 593 error = 0; 594 while (error == 0 && uio->uio_resid > 0) { 595 vsize_t len; 596 void *win; 597 598 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 599 if (len == 0) 600 break; 601 602 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 603 UBC_WRITE); 604 error = uiomove(win, len, uio); 605 ubc_release(win, flags); 606 } 607 608 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 609 (extended ? TMPFS_NODE_CHANGED : 0); 610 611 if (error != 0) 612 (void)tmpfs_reg_resize(vp, oldsize); 613 614 VN_KNOTE(vp, NOTE_WRITE); 615 616 out: 617 KASSERT(VOP_ISLOCKED(vp)); 618 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 619 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 620 621 return error; 622 } 623 624 /* --------------------------------------------------------------------- */ 625 626 int 627 tmpfs_fsync(void *v) 628 { 629 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 630 631 KASSERT(VOP_ISLOCKED(vp)); 632 633 tmpfs_update(vp, NULL, NULL, NULL, 0); 634 635 return 0; 636 } 637 638 /* --------------------------------------------------------------------- */ 639 640 int 641 tmpfs_remove(void *v) 642 { 643 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 644 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 645 struct componentname *cnp = (((struct vop_remove_args *)v)->a_cnp); 646 647 int error; 648 struct tmpfs_dirent *de; 649 struct tmpfs_mount *tmp; 650 struct tmpfs_node *dnode; 651 struct tmpfs_node *node; 652 653 KASSERT(VOP_ISLOCKED(dvp)); 654 KASSERT(VOP_ISLOCKED(vp)); 655 656 if (vp->v_type == VDIR) { 657 error = EPERM; 658 goto out; 659 } 660 661 dnode = VP_TO_TMPFS_DIR(dvp); 662 node = VP_TO_TMPFS_NODE(vp); 663 tmp = VFS_TO_TMPFS(vp->v_mount); 664 de = tmpfs_dir_lookup(dnode, cnp); 665 if (de == NULL) { 666 error = ENOENT; 667 goto out; 668 } 669 KASSERT(de->td_node == node); 670 671 /* Files marked as immutable or append-only cannot be deleted. */ 672 if (node->tn_flags & (IMMUTABLE | APPEND)) { 673 error = EPERM; 674 goto out; 675 } 676 677 /* Remove the entry from the directory; as it is a file, we do not 678 * have to change the number of hard links of the directory. */ 679 tmpfs_dir_detach(dvp, de); 680 681 /* Free the directory entry we just deleted. Note that the node 682 * referred by it will not be removed until the vnode is really 683 * reclaimed. */ 684 tmpfs_free_dirent(tmp, de, true); 685 686 error = 0; 687 688 out: 689 vput(vp); 690 if (dvp == vp) 691 vrele(dvp); 692 else 693 vput(dvp); 694 PNBUF_PUT(cnp->cn_pnbuf); 695 696 return error; 697 } 698 699 /* --------------------------------------------------------------------- */ 700 701 int 702 tmpfs_link(void *v) 703 { 704 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 705 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 706 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 707 708 int error; 709 struct tmpfs_dirent *de; 710 struct tmpfs_node *dnode; 711 struct tmpfs_node *node; 712 713 KASSERT(VOP_ISLOCKED(dvp)); 714 KASSERT(cnp->cn_flags & HASBUF); 715 KASSERT(dvp != vp); /* XXX When can this be false? */ 716 717 dnode = VP_TO_TMPFS_DIR(dvp); 718 node = VP_TO_TMPFS_NODE(vp); 719 720 /* Lock vp because we will need to run tmpfs_update over it, which 721 * needs the vnode to be locked. */ 722 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 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 PNBUF_PUT(cnp->cn_pnbuf); 770 vput(dvp); 771 772 return error; 773 } 774 775 /* 776 * tmpfs_rename: rename routine. 777 * 778 * Arguments: fdvp (from-parent vnode), fvp (from-leaf), tdvp (to-parent) 779 * and tvp (to-leaf), if exists (NULL if not). 780 * 781 * => Caller holds a reference on fdvp and fvp, they are unlocked. 782 * Note: fdvp and fvp can refer to the same object (i.e. when it is root). 783 * 784 * => Both tdvp and tvp are referenced and locked. It is our responsibility 785 * to release the references and unlock them (or destroy). 786 */ 787 int 788 tmpfs_rename(void *v) 789 { 790 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 791 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 792 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 793 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 794 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 795 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 796 797 char *newname; 798 int error; 799 struct tmpfs_dirent *de, *de2; 800 struct tmpfs_mount *tmp; 801 struct tmpfs_node *fdnode; 802 struct tmpfs_node *fnode; 803 struct tmpfs_node *tnode; 804 struct tmpfs_node *tdnode; 805 size_t namelen; 806 807 KASSERT(VOP_ISLOCKED(tdvp)); 808 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 809 KASSERT(fcnp->cn_flags & HASBUF); 810 KASSERT(tcnp->cn_flags & HASBUF); 811 812 newname = NULL; 813 namelen = 0; 814 tmp = NULL; 815 816 /* Disallow cross-device renames. */ 817 if (fvp->v_mount != tdvp->v_mount || 818 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 819 error = EXDEV; 820 goto out_unlocked; 821 } 822 823 fnode = VP_TO_TMPFS_NODE(fvp); 824 fdnode = VP_TO_TMPFS_DIR(fdvp); 825 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 826 tdnode = VP_TO_TMPFS_DIR(tdvp); 827 tmp = VFS_TO_TMPFS(tdvp->v_mount); 828 829 if (fdvp == tvp) { 830 error = 0; 831 goto out_unlocked; 832 } 833 834 /* If we need to move the directory between entries, lock the 835 * source so that we can safely operate on it. */ 836 837 /* XXX: this is a potential locking order violation! */ 838 if (fdnode != tdnode) { 839 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 840 } 841 842 /* 843 * If the node we were renaming has scarpered, just give up. 844 */ 845 de = tmpfs_dir_lookup(fdnode, fcnp); 846 if (de == NULL || de->td_node != fnode) { 847 error = ENOENT; 848 goto out; 849 } 850 851 /* If source and target is the same vnode, remove the source link. */ 852 if (fvp == tvp) { 853 /* 854 * Detach and free the directory entry. Drops the link 855 * count on the node. 856 */ 857 tmpfs_dir_detach(fdvp, de); 858 tmpfs_free_dirent(VFS_TO_TMPFS(fvp->v_mount), de, true); 859 VN_KNOTE(fdvp, NOTE_WRITE); 860 goto out_ok; 861 } 862 863 /* If replacing an existing entry, ensure we can do the operation. */ 864 if (tvp != NULL) { 865 KASSERT(tnode != NULL); 866 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 867 if (tnode->tn_size > 0) { 868 error = ENOTEMPTY; 869 goto out; 870 } 871 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 872 error = ENOTDIR; 873 goto out; 874 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 875 error = EISDIR; 876 goto out; 877 } else { 878 KASSERT(fnode->tn_type != VDIR && 879 tnode->tn_type != VDIR); 880 } 881 } 882 883 /* Ensure that we have enough memory to hold the new name, if it 884 * has to be changed. */ 885 namelen = tcnp->cn_namelen; 886 if (fcnp->cn_namelen != tcnp->cn_namelen || 887 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 888 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, namelen, 0); 889 if (newname == NULL) { 890 error = ENOSPC; 891 goto out; 892 } 893 } 894 895 /* If the node is being moved to another directory, we have to do 896 * the move. */ 897 if (fdnode != tdnode) { 898 /* In case we are moving a directory, we have to adjust its 899 * parent to point to the new parent. */ 900 if (de->td_node->tn_type == VDIR) { 901 struct tmpfs_node *n; 902 903 /* Ensure the target directory is not a child of the 904 * directory being moved. Otherwise, we'd end up 905 * with stale nodes. */ 906 n = tdnode; 907 while (n != n->tn_spec.tn_dir.tn_parent) { 908 if (n == fnode) { 909 error = EINVAL; 910 goto out; 911 } 912 n = n->tn_spec.tn_dir.tn_parent; 913 } 914 915 /* Adjust the parent pointer. */ 916 TMPFS_VALIDATE_DIR(fnode); 917 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 918 919 /* As a result of changing the target of the '..' 920 * entry, the link count of the source and target 921 * directories has to be adjusted. */ 922 fdnode->tn_links--; 923 tdnode->tn_links++; 924 } 925 926 /* Do the move: just remove the entry from the source directory 927 * and insert it into the target one. */ 928 tmpfs_dir_detach(fdvp, de); 929 tmpfs_dir_attach(tdvp, de); 930 931 /* Notify listeners of fdvp about the change in the directory. 932 * We can do it at this point because we aren't touching fdvp 933 * any more below. */ 934 VN_KNOTE(fdvp, NOTE_WRITE); 935 } 936 937 /* If we are overwriting an entry, we have to remove the old one 938 * from the target directory. */ 939 if (tvp != NULL) { 940 KASSERT(tnode != NULL); 941 942 /* Remove the old entry from the target directory. 943 * Note! This relies on tmpfs_dir_attach() putting the new 944 * node on the end of the target's node list. */ 945 de2 = tmpfs_dir_lookup(tdnode, tcnp); 946 KASSERT(de2 != NULL); 947 KASSERT(de2->td_node == tnode); 948 tmpfs_dir_detach(tdvp, de2); 949 950 /* Free the directory entry we just deleted. Note that the 951 * node referred by it will not be removed until the vnode is 952 * really reclaimed. */ 953 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de2, true); 954 } 955 956 /* If the name has changed, we need to make it effective by changing 957 * it in the directory entry. */ 958 if (newname != NULL) { 959 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 960 KASSERT(tcnp->cn_namelen < 0xffff); 961 962 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 963 de->td_namelen); 964 de->td_namelen = (uint16_t)namelen; 965 memcpy(newname, tcnp->cn_nameptr, namelen); 966 de->td_name = newname; 967 newname = NULL; 968 969 fnode->tn_status |= TMPFS_NODE_CHANGED; 970 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 971 } 972 out_ok: 973 /* Notify listeners of tdvp about the change in the directory (either 974 * because a new entry was added or because one was removed) and 975 * listeners of fvp about the rename. */ 976 VN_KNOTE(tdvp, NOTE_WRITE); 977 VN_KNOTE(fvp, NOTE_RENAME); 978 979 error = 0; 980 981 out: 982 if (fdnode != tdnode) 983 VOP_UNLOCK(fdvp, 0); 984 985 out_unlocked: 986 /* Release target nodes. */ 987 if (tdvp == tvp) 988 vrele(tdvp); 989 else 990 vput(tdvp); 991 if (tvp != NULL) 992 vput(tvp); 993 994 /* Release source nodes. */ 995 vrele(fdvp); 996 vrele(fvp); 997 998 if (newname != NULL) 999 tmpfs_str_pool_put(&tmp->tm_str_pool, newname, namelen); 1000 1001 return error; 1002 } 1003 1004 /* --------------------------------------------------------------------- */ 1005 1006 int 1007 tmpfs_mkdir(void *v) 1008 { 1009 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 1010 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 1011 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 1012 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 1013 1014 KASSERT(vap->va_type == VDIR); 1015 1016 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1017 } 1018 1019 /* --------------------------------------------------------------------- */ 1020 1021 int 1022 tmpfs_rmdir(void *v) 1023 { 1024 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1025 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1026 struct componentname *cnp = ((struct vop_rmdir_args *)v)->a_cnp; 1027 1028 int error; 1029 struct tmpfs_dirent *de; 1030 struct tmpfs_mount *tmp; 1031 struct tmpfs_node *dnode; 1032 struct tmpfs_node *node; 1033 1034 KASSERT(VOP_ISLOCKED(dvp)); 1035 KASSERT(VOP_ISLOCKED(vp)); 1036 1037 tmp = VFS_TO_TMPFS(dvp->v_mount); 1038 dnode = VP_TO_TMPFS_DIR(dvp); 1039 node = VP_TO_TMPFS_DIR(vp); 1040 error = 0; 1041 1042 /* Directories with more than two entries ('.' and '..') cannot be 1043 * removed. */ 1044 if (node->tn_size > 0) { 1045 error = ENOTEMPTY; 1046 goto out; 1047 } 1048 1049 /* This invariant holds only if we are not trying to remove "..". 1050 * We checked for that above so this is safe now. */ 1051 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1052 1053 /* Get the directory entry associated with node (vp). */ 1054 de = tmpfs_dir_lookup(dnode, cnp); 1055 if (de == NULL) { 1056 error = ENOENT; 1057 goto out; 1058 } 1059 KASSERT(de->td_node == node); 1060 1061 /* Check flags to see if we are allowed to remove the directory. */ 1062 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1063 error = EPERM; 1064 goto out; 1065 } 1066 1067 /* Detach the directory entry from the directory (dnode). */ 1068 tmpfs_dir_detach(dvp, de); 1069 1070 node->tn_links--; 1071 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1072 TMPFS_NODE_MODIFIED; 1073 node->tn_spec.tn_dir.tn_parent->tn_links--; 1074 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1075 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1076 1077 /* Release the parent. */ 1078 cache_purge(dvp); /* XXX Is this needed? */ 1079 1080 /* Free the directory entry we just deleted. Note that the node 1081 * referred by it will not be removed until the vnode is really 1082 * reclaimed. */ 1083 tmpfs_free_dirent(tmp, de, true); 1084 1085 KASSERT(node->tn_links == 0); 1086 out: 1087 /* Release the nodes. */ 1088 vput(dvp); 1089 vput(vp); 1090 PNBUF_PUT(cnp->cn_pnbuf); 1091 1092 return error; 1093 } 1094 1095 /* --------------------------------------------------------------------- */ 1096 1097 int 1098 tmpfs_symlink(void *v) 1099 { 1100 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1101 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1102 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1103 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1104 char *target = ((struct vop_symlink_args *)v)->a_target; 1105 1106 KASSERT(vap->va_type == VLNK); 1107 1108 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1109 } 1110 1111 /* --------------------------------------------------------------------- */ 1112 1113 int 1114 tmpfs_readdir(void *v) 1115 { 1116 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1117 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1118 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1119 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1120 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1121 1122 int error; 1123 off_t startoff; 1124 off_t cnt; 1125 struct tmpfs_node *node; 1126 1127 KASSERT(VOP_ISLOCKED(vp)); 1128 1129 /* This operation only makes sense on directory nodes. */ 1130 if (vp->v_type != VDIR) { 1131 error = ENOTDIR; 1132 goto out; 1133 } 1134 1135 node = VP_TO_TMPFS_DIR(vp); 1136 1137 startoff = uio->uio_offset; 1138 1139 cnt = 0; 1140 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1141 error = tmpfs_dir_getdotdent(node, uio); 1142 if (error == -1) { 1143 error = 0; 1144 goto outok; 1145 } else if (error != 0) 1146 goto outok; 1147 cnt++; 1148 } 1149 1150 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1151 error = tmpfs_dir_getdotdotdent(node, uio); 1152 if (error == -1) { 1153 error = 0; 1154 goto outok; 1155 } else if (error != 0) 1156 goto outok; 1157 cnt++; 1158 } 1159 1160 error = tmpfs_dir_getdents(node, uio, &cnt); 1161 if (error == -1) 1162 error = 0; 1163 KASSERT(error >= 0); 1164 1165 outok: 1166 /* This label assumes that startoff has been 1167 * initialized. If the compiler didn't spit out warnings, we'd 1168 * simply make this one be 'out' and drop 'outok'. */ 1169 1170 if (eofflag != NULL) 1171 *eofflag = 1172 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1173 1174 /* Update NFS-related variables. */ 1175 if (error == 0 && cookies != NULL && ncookies != NULL) { 1176 off_t i; 1177 off_t off = startoff; 1178 struct tmpfs_dirent *de = NULL; 1179 1180 *ncookies = cnt; 1181 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1182 1183 for (i = 0; i < cnt; i++) { 1184 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1185 if (off == TMPFS_DIRCOOKIE_DOT) { 1186 off = TMPFS_DIRCOOKIE_DOTDOT; 1187 } else { 1188 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1189 de = TAILQ_FIRST(&node->tn_spec. 1190 tn_dir.tn_dir); 1191 } else if (de != NULL) { 1192 de = TAILQ_NEXT(de, td_entries); 1193 } else { 1194 de = tmpfs_dir_lookupbycookie(node, 1195 off); 1196 KASSERT(de != NULL); 1197 de = TAILQ_NEXT(de, td_entries); 1198 } 1199 if (de == NULL) { 1200 off = TMPFS_DIRCOOKIE_EOF; 1201 } else { 1202 off = tmpfs_dircookie(de); 1203 } 1204 } 1205 1206 (*cookies)[i] = off; 1207 } 1208 KASSERT(uio->uio_offset == off); 1209 } 1210 1211 out: 1212 KASSERT(VOP_ISLOCKED(vp)); 1213 1214 return error; 1215 } 1216 1217 /* --------------------------------------------------------------------- */ 1218 1219 int 1220 tmpfs_readlink(void *v) 1221 { 1222 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1223 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1224 1225 int error; 1226 struct tmpfs_node *node; 1227 1228 KASSERT(VOP_ISLOCKED(vp)); 1229 KASSERT(uio->uio_offset == 0); 1230 KASSERT(vp->v_type == VLNK); 1231 1232 node = VP_TO_TMPFS_NODE(vp); 1233 1234 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1235 MIN(node->tn_size, uio->uio_resid), uio); 1236 node->tn_status |= TMPFS_NODE_ACCESSED; 1237 1238 KASSERT(VOP_ISLOCKED(vp)); 1239 1240 return error; 1241 } 1242 1243 /* --------------------------------------------------------------------- */ 1244 1245 int 1246 tmpfs_inactive(void *v) 1247 { 1248 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1249 1250 struct tmpfs_node *node; 1251 1252 KASSERT(VOP_ISLOCKED(vp)); 1253 1254 node = VP_TO_TMPFS_NODE(vp); 1255 *((struct vop_inactive_args *)v)->a_recycle = (node->tn_links == 0); 1256 VOP_UNLOCK(vp, 0); 1257 1258 return 0; 1259 } 1260 1261 /* --------------------------------------------------------------------- */ 1262 1263 int 1264 tmpfs_reclaim(void *v) 1265 { 1266 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1267 1268 struct tmpfs_mount *tmp; 1269 struct tmpfs_node *node; 1270 1271 node = VP_TO_TMPFS_NODE(vp); 1272 tmp = VFS_TO_TMPFS(vp->v_mount); 1273 1274 cache_purge(vp); 1275 tmpfs_free_vp(vp); 1276 1277 /* If the node referenced by this vnode was deleted by the user, 1278 * we must free its associated data structures (now that the vnode 1279 * is being reclaimed). */ 1280 if (node->tn_links == 0) 1281 tmpfs_free_node(tmp, node); 1282 1283 KASSERT(vp->v_data == NULL); 1284 1285 return 0; 1286 } 1287 1288 /* --------------------------------------------------------------------- */ 1289 1290 int 1291 tmpfs_print(void *v) 1292 { 1293 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1294 1295 struct tmpfs_node *node; 1296 1297 node = VP_TO_TMPFS_NODE(vp); 1298 1299 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1300 node, node->tn_flags, node->tn_links); 1301 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1302 ", status 0x%x\n", 1303 node->tn_mode, node->tn_uid, node->tn_gid, 1304 (uintmax_t)node->tn_size, node->tn_status); 1305 if (vp->v_type == VFIFO) 1306 fifo_printinfo(vp); 1307 printf("\n"); 1308 1309 return 0; 1310 } 1311 1312 /* --------------------------------------------------------------------- */ 1313 1314 int 1315 tmpfs_pathconf(void *v) 1316 { 1317 int name = ((struct vop_pathconf_args *)v)->a_name; 1318 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1319 1320 int error; 1321 1322 error = 0; 1323 1324 switch (name) { 1325 case _PC_LINK_MAX: 1326 *retval = LINK_MAX; 1327 break; 1328 1329 case _PC_NAME_MAX: 1330 *retval = NAME_MAX; 1331 break; 1332 1333 case _PC_PATH_MAX: 1334 *retval = PATH_MAX; 1335 break; 1336 1337 case _PC_PIPE_BUF: 1338 *retval = PIPE_BUF; 1339 break; 1340 1341 case _PC_CHOWN_RESTRICTED: 1342 *retval = 1; 1343 break; 1344 1345 case _PC_NO_TRUNC: 1346 *retval = 1; 1347 break; 1348 1349 case _PC_SYNC_IO: 1350 *retval = 1; 1351 break; 1352 1353 case _PC_FILESIZEBITS: 1354 *retval = 0; /* XXX Don't know which value should I return. */ 1355 break; 1356 1357 default: 1358 error = EINVAL; 1359 } 1360 1361 return error; 1362 } 1363 1364 /* --------------------------------------------------------------------- */ 1365 1366 int 1367 tmpfs_advlock(void *v) 1368 { 1369 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1370 1371 struct tmpfs_node *node; 1372 1373 node = VP_TO_TMPFS_NODE(vp); 1374 1375 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1376 } 1377 1378 /* --------------------------------------------------------------------- */ 1379 1380 int 1381 tmpfs_getpages(void *v) 1382 { 1383 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1384 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1385 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1386 int *count = ((struct vop_getpages_args *)v)->a_count; 1387 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1388 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1389 int advice = ((struct vop_getpages_args *)v)->a_advice; 1390 int flags = ((struct vop_getpages_args *)v)->a_flags; 1391 1392 int error; 1393 int i; 1394 struct tmpfs_node *node; 1395 struct uvm_object *uobj; 1396 int npages = *count; 1397 1398 KASSERT(vp->v_type == VREG); 1399 KASSERT(mutex_owned(&vp->v_interlock)); 1400 1401 node = VP_TO_TMPFS_NODE(vp); 1402 uobj = node->tn_spec.tn_reg.tn_aobj; 1403 1404 /* We currently don't rely on PGO_PASTEOF. */ 1405 1406 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1407 if ((flags & PGO_LOCKED) == 0) 1408 mutex_exit(&vp->v_interlock); 1409 return EINVAL; 1410 } 1411 1412 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1413 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1414 } 1415 1416 if ((flags & PGO_LOCKED) != 0) 1417 return EBUSY; 1418 1419 if ((flags & PGO_NOTIMESTAMP) == 0) { 1420 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1421 node->tn_status |= TMPFS_NODE_ACCESSED; 1422 1423 if ((access_type & VM_PROT_WRITE) != 0) 1424 node->tn_status |= TMPFS_NODE_MODIFIED; 1425 } 1426 1427 mutex_exit(&vp->v_interlock); 1428 1429 /* 1430 * Make sure that the array on which we will store the 1431 * gotten pages is clean. Otherwise uao_get (pointed to by 1432 * the pgo_get below) gets confused and does not return the 1433 * appropriate pages. 1434 * 1435 * XXX This shall be revisited when kern/32166 is addressed 1436 * because the loop to clean m[i] will most likely be redundant 1437 * as well as the PGO_ALLPAGES flag. 1438 */ 1439 if (m != NULL) 1440 for (i = 0; i < npages; i++) 1441 m[i] = NULL; 1442 mutex_enter(&uobj->vmobjlock); 1443 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1444 access_type, advice, flags | PGO_ALLPAGES); 1445 #if defined(DEBUG) 1446 { 1447 /* Make sure that all the pages we return are valid. */ 1448 int dbgi; 1449 if (error == 0 && m != NULL) 1450 for (dbgi = 0; dbgi < npages; dbgi++) 1451 KASSERT(m[dbgi] != NULL); 1452 } 1453 #endif 1454 1455 return error; 1456 } 1457 1458 /* --------------------------------------------------------------------- */ 1459 1460 int 1461 tmpfs_putpages(void *v) 1462 { 1463 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1464 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1465 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1466 int flags = ((struct vop_putpages_args *)v)->a_flags; 1467 1468 int error; 1469 struct tmpfs_node *node; 1470 struct uvm_object *uobj; 1471 1472 KASSERT(mutex_owned(&vp->v_interlock)); 1473 1474 node = VP_TO_TMPFS_NODE(vp); 1475 1476 if (vp->v_type != VREG) { 1477 mutex_exit(&vp->v_interlock); 1478 return 0; 1479 } 1480 1481 uobj = node->tn_spec.tn_reg.tn_aobj; 1482 mutex_exit(&vp->v_interlock); 1483 1484 mutex_enter(&uobj->vmobjlock); 1485 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1486 1487 /* XXX mtime */ 1488 1489 return error; 1490 } 1491
Indexes created Tue Sep 30 20:09:53 GMT 2025