tmpfs_vnops.c revision 1.36
1/* $NetBSD: tmpfs_vnops.c,v 1.36 2007/02/21 23:00:04 thorpej Exp $ */ 2 3/* 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * tmpfs vnode interface. 42 */ 43 44#include <sys/cdefs.h> 45__KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.36 2007/02/21 23:00:04 thorpej Exp $"); 46 47#include <sys/param.h> 48#include <sys/dirent.h> 49#include <sys/fcntl.h> 50#include <sys/event.h> 51#include <sys/malloc.h> 52#include <sys/namei.h> 53#include <sys/proc.h> 54#include <sys/stat.h> 55#include <sys/uio.h> 56#include <sys/unistd.h> 57#include <sys/vnode.h> 58#include <sys/lockf.h> 59#include <sys/kauth.h> 60 61#include <uvm/uvm.h> 62 63#include <miscfs/fifofs/fifo.h> 64#include <fs/tmpfs/tmpfs_vnops.h> 65#include <fs/tmpfs/tmpfs.h> 66 67/* --------------------------------------------------------------------- */ 68 69/* 70 * vnode operations vector used for files stored in a tmpfs file system. 71 */ 72int (**tmpfs_vnodeop_p)(void *); 73const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 74 { &vop_default_desc, vn_default_error }, 75 { &vop_lookup_desc, tmpfs_lookup }, 76 { &vop_create_desc, tmpfs_create }, 77 { &vop_mknod_desc, tmpfs_mknod }, 78 { &vop_open_desc, tmpfs_open }, 79 { &vop_close_desc, tmpfs_close }, 80 { &vop_access_desc, tmpfs_access }, 81 { &vop_getattr_desc, tmpfs_getattr }, 82 { &vop_setattr_desc, tmpfs_setattr }, 83 { &vop_read_desc, tmpfs_read }, 84 { &vop_write_desc, tmpfs_write }, 85 { &vop_ioctl_desc, tmpfs_ioctl }, 86 { &vop_fcntl_desc, tmpfs_fcntl }, 87 { &vop_poll_desc, tmpfs_poll }, 88 { &vop_kqfilter_desc, tmpfs_kqfilter }, 89 { &vop_revoke_desc, tmpfs_revoke }, 90 { &vop_mmap_desc, tmpfs_mmap }, 91 { &vop_fsync_desc, tmpfs_fsync }, 92 { &vop_seek_desc, tmpfs_seek }, 93 { &vop_remove_desc, tmpfs_remove }, 94 { &vop_link_desc, tmpfs_link }, 95 { &vop_rename_desc, tmpfs_rename }, 96 { &vop_mkdir_desc, tmpfs_mkdir }, 97 { &vop_rmdir_desc, tmpfs_rmdir }, 98 { &vop_symlink_desc, tmpfs_symlink }, 99 { &vop_readdir_desc, tmpfs_readdir }, 100 { &vop_readlink_desc, tmpfs_readlink }, 101 { &vop_abortop_desc, tmpfs_abortop }, 102 { &vop_inactive_desc, tmpfs_inactive }, 103 { &vop_reclaim_desc, tmpfs_reclaim }, 104 { &vop_lock_desc, tmpfs_lock }, 105 { &vop_unlock_desc, tmpfs_unlock }, 106 { &vop_bmap_desc, tmpfs_bmap }, 107 { &vop_strategy_desc, tmpfs_strategy }, 108 { &vop_print_desc, tmpfs_print }, 109 { &vop_pathconf_desc, tmpfs_pathconf }, 110 { &vop_islocked_desc, tmpfs_islocked }, 111 { &vop_advlock_desc, tmpfs_advlock }, 112 { &vop_lease_desc, tmpfs_lease }, 113 { &vop_bwrite_desc, tmpfs_bwrite }, 114 { &vop_getpages_desc, tmpfs_getpages }, 115 { &vop_putpages_desc, tmpfs_putpages }, 116 { NULL, NULL } 117}; 118const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 119 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 120 121/* --------------------------------------------------------------------- */ 122 123int 124tmpfs_lookup(void *v) 125{ 126 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 127 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 128 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 129 130 int error; 131 struct tmpfs_dirent *de; 132 struct tmpfs_node *dnode; 133 134 KASSERT(VOP_ISLOCKED(dvp)); 135 136 dnode = VP_TO_TMPFS_DIR(dvp); 137 *vpp = NULL; 138 139 /* Check accessibility of requested node as a first step. */ 140 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp); 141 if (error != 0) 142 goto out; 143 144 /* If requesting the last path component on a read-only file system 145 * with a write operation, deny it. */ 146 if ((cnp->cn_flags & ISLASTCN) && 147 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 148 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 149 error = EROFS; 150 goto out; 151 } 152 153 /* Avoid doing a linear scan of the directory if the requested 154 * directory/name couple is already in the cache. */ 155 error = cache_lookup(dvp, vpp, cnp); 156 if (error >= 0) 157 goto out; 158 159 /* We cannot be requesting the parent directory of the root node. */ 160 KASSERT(IMPLIES(dnode->tn_type == VDIR && 161 dnode->tn_spec.tn_dir.tn_parent == dnode, 162 !(cnp->cn_flags & ISDOTDOT))); 163 164 if (cnp->cn_flags & ISDOTDOT) { 165 VOP_UNLOCK(dvp, 0); 166 167 /* Allocate a new vnode on the matching entry. */ 168 error = tmpfs_alloc_vp(dvp->v_mount, 169 dnode->tn_spec.tn_dir.tn_parent, vpp); 170 171 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 172 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 173 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 174 VREF(dvp); 175 *vpp = dvp; 176 dnode->tn_lookup_dirent = NULL; 177 error = 0; 178 } else { 179 de = tmpfs_dir_lookup(dnode, cnp); 180 if (de == NULL) { 181 /* The entry was not found in the directory. 182 * This is OK iff we are creating or renaming an 183 * entry and are working on the last component of 184 * the path name. */ 185 if ((cnp->cn_flags & ISLASTCN) && 186 (cnp->cn_nameiop == CREATE || \ 187 cnp->cn_nameiop == RENAME)) { 188 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 189 cnp->cn_lwp); 190 if (error != 0) 191 goto out; 192 193 /* Keep the component name in the buffer for 194 * future uses. */ 195 cnp->cn_flags |= SAVENAME; 196 197 error = EJUSTRETURN; 198 } else 199 error = ENOENT; 200 } else { 201 struct tmpfs_node *tnode; 202 203 /* The entry was found, so get its associated 204 * tmpfs_node. */ 205 tnode = de->td_node; 206 207 /* If we are not at the last path component and 208 * found a non-directory or non-link entry (which 209 * may itself be pointing to a directory), raise 210 * an error. */ 211 if ((tnode->tn_type != VDIR && 212 tnode->tn_type != VLNK) && 213 !(cnp->cn_flags & ISLASTCN)) { 214 error = ENOTDIR; 215 goto out; 216 } 217 218 /* If we are deleting or renaming the entry, keep 219 * track of its tmpfs_dirent so that it can be 220 * easily deleted later. */ 221 if ((cnp->cn_flags & ISLASTCN) && 222 (cnp->cn_nameiop == DELETE || 223 cnp->cn_nameiop == RENAME)) { 224 if ((dnode->tn_mode & S_ISTXT) != 0 && 225 kauth_authorize_generic(cnp->cn_cred, 226 KAUTH_GENERIC_ISSUSER, NULL) != 0 && 227 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 228 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 229 return EPERM; 230 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 231 cnp->cn_lwp); 232 if (error != 0) 233 goto out; 234 tnode->tn_lookup_dirent = de; 235 } 236 237 /* Allocate a new vnode on the matching entry. */ 238 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 239 } 240 } 241 242 /* Store the result of this lookup in the cache. Avoid this if the 243 * request was for creation, as it does not improve timings on 244 * emprical tests. */ 245 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 246 cache_enter(dvp, *vpp, cnp); 247 248out: 249 /* If there were no errors, *vpp cannot be null and it must be 250 * locked. */ 251 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 252 253 /* dvp must always be locked. */ 254 KASSERT(VOP_ISLOCKED(dvp)); 255 256 return error; 257} 258 259/* --------------------------------------------------------------------- */ 260 261int 262tmpfs_create(void *v) 263{ 264 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 265 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 266 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 267 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 268 269 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 270 271 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 272} 273/* --------------------------------------------------------------------- */ 274 275int 276tmpfs_mknod(void *v) 277{ 278 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 279 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 280 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 281 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 282 283 if (vap->va_type != VBLK && vap->va_type != VCHR && 284 vap->va_type != VFIFO) 285 return EINVAL; 286 287 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 288} 289 290/* --------------------------------------------------------------------- */ 291 292int 293tmpfs_open(void *v) 294{ 295 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 296 int mode = ((struct vop_open_args *)v)->a_mode; 297 298 int error; 299 struct tmpfs_node *node; 300 301 KASSERT(VOP_ISLOCKED(vp)); 302 303 node = VP_TO_TMPFS_NODE(vp); 304 305 /* The file is still active but all its names have been removed 306 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 307 * it is about to die. */ 308 if (node->tn_links < 1) { 309 error = ENOENT; 310 goto out; 311 } 312 313 /* If the file is marked append-only, deny write requests. */ 314 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 315 error = EPERM; 316 else 317 error = 0; 318 319out: 320 KASSERT(VOP_ISLOCKED(vp)); 321 322 return error; 323} 324 325/* --------------------------------------------------------------------- */ 326 327int 328tmpfs_close(void *v) 329{ 330 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 331 332 struct tmpfs_node *node; 333 334 KASSERT(VOP_ISLOCKED(vp)); 335 336 node = VP_TO_TMPFS_NODE(vp); 337 338 if (node->tn_links > 0) { 339 /* Update node times. No need to do it if the node has 340 * been deleted, because it will vanish after we return. */ 341 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 342 } 343 344 return 0; 345} 346 347/* --------------------------------------------------------------------- */ 348 349int 350tmpfs_access(void *v) 351{ 352 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 353 int mode = ((struct vop_access_args *)v)->a_mode; 354 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 355 356 int error; 357 struct tmpfs_node *node; 358 359 KASSERT(VOP_ISLOCKED(vp)); 360 361 node = VP_TO_TMPFS_NODE(vp); 362 363 switch (vp->v_type) { 364 case VDIR: 365 /* FALLTHROUGH */ 366 case VLNK: 367 /* FALLTHROUGH */ 368 case VREG: 369 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 370 error = EROFS; 371 goto out; 372 } 373 break; 374 375 case VBLK: 376 /* FALLTHROUGH */ 377 case VCHR: 378 /* FALLTHROUGH */ 379 case VSOCK: 380 /* FALLTHROUGH */ 381 case VFIFO: 382 break; 383 384 default: 385 error = EINVAL; 386 goto out; 387 } 388 389 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 390 error = EPERM; 391 goto out; 392 } 393 394 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 395 node->tn_gid, mode, cred); 396 397out: 398 KASSERT(VOP_ISLOCKED(vp)); 399 400 return error; 401} 402 403/* --------------------------------------------------------------------- */ 404 405int 406tmpfs_getattr(void *v) 407{ 408 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 409 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 410 411 struct tmpfs_node *node; 412 413 node = VP_TO_TMPFS_NODE(vp); 414 415 VATTR_NULL(vap); 416 417 tmpfs_itimes(vp, NULL, NULL); 418 419 vap->va_type = vp->v_type; 420 vap->va_mode = node->tn_mode; 421 vap->va_nlink = node->tn_links; 422 vap->va_uid = node->tn_uid; 423 vap->va_gid = node->tn_gid; 424 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 425 vap->va_fileid = node->tn_id; 426 vap->va_size = node->tn_size; 427 vap->va_blocksize = PAGE_SIZE; 428 vap->va_atime = node->tn_atime; 429 vap->va_mtime = node->tn_mtime; 430 vap->va_ctime = node->tn_ctime; 431 vap->va_birthtime = node->tn_birthtime; 432 vap->va_gen = node->tn_gen; 433 vap->va_flags = node->tn_flags; 434 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 435 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 436 vap->va_bytes = round_page(node->tn_size); 437 vap->va_filerev = VNOVAL; 438 vap->va_vaflags = 0; 439 vap->va_spare = VNOVAL; /* XXX */ 440 441 return 0; 442} 443 444/* --------------------------------------------------------------------- */ 445 446/* XXX Should this operation be atomic? I think it should, but code in 447 * XXX other places (e.g., ufs) doesn't seem to be... */ 448int 449tmpfs_setattr(void *v) 450{ 451 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 452 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 453 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 454 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 455 456 int error; 457 458 KASSERT(VOP_ISLOCKED(vp)); 459 460 error = 0; 461 462 /* Abort if any unsettable attribute is given. */ 463 if (vap->va_type != VNON || 464 vap->va_nlink != VNOVAL || 465 vap->va_fsid != VNOVAL || 466 vap->va_fileid != VNOVAL || 467 vap->va_blocksize != VNOVAL || 468 vap->va_ctime.tv_sec != VNOVAL || 469 vap->va_ctime.tv_nsec != VNOVAL || 470 vap->va_birthtime.tv_sec != VNOVAL || 471 vap->va_birthtime.tv_nsec != VNOVAL || 472 vap->va_gen != VNOVAL || 473 vap->va_rdev != VNOVAL || 474 vap->va_bytes != VNOVAL) 475 error = EINVAL; 476 477 if (error == 0 && (vap->va_flags != VNOVAL)) 478 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 479 480 if (error == 0 && (vap->va_size != VNOVAL)) 481 error = tmpfs_chsize(vp, vap->va_size, cred, l); 482 483 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 484 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 485 486 if (error == 0 && (vap->va_mode != VNOVAL)) 487 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 488 489 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 490 vap->va_atime.tv_nsec != VNOVAL) || 491 (vap->va_mtime.tv_sec != VNOVAL && 492 vap->va_mtime.tv_nsec != VNOVAL))) 493 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 494 vap->va_vaflags, cred, l); 495 496 /* Update the node times. We give preference to the error codes 497 * generated by this function rather than the ones that may arise 498 * from tmpfs_update. */ 499 tmpfs_update(vp, NULL, NULL, 0); 500 501 KASSERT(VOP_ISLOCKED(vp)); 502 503 return error; 504} 505 506/* --------------------------------------------------------------------- */ 507 508int 509tmpfs_read(void *v) 510{ 511 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 512 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 513 514 int error; 515 int flags; 516 struct tmpfs_node *node; 517 struct uvm_object *uobj; 518 519 KASSERT(VOP_ISLOCKED(vp)); 520 521 node = VP_TO_TMPFS_NODE(vp); 522 523 if (vp->v_type != VREG) { 524 error = EISDIR; 525 goto out; 526 } 527 528 if (uio->uio_offset < 0) { 529 error = EINVAL; 530 goto out; 531 } 532 533 node->tn_status |= TMPFS_NODE_ACCESSED; 534 535 uobj = node->tn_spec.tn_reg.tn_aobj; 536 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 537 error = 0; 538 while (error == 0 && uio->uio_resid > 0) { 539 vsize_t len; 540 void *win; 541 542 if (node->tn_size <= uio->uio_offset) 543 break; 544 545 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 546 if (len == 0) 547 break; 548 549 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 550 UBC_READ); 551 error = uiomove(win, len, uio); 552 ubc_release(win, flags); 553 } 554 555out: 556 KASSERT(VOP_ISLOCKED(vp)); 557 558 return error; 559} 560 561/* --------------------------------------------------------------------- */ 562 563int 564tmpfs_write(void *v) 565{ 566 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 567 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 568 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 569 570 bool extended; 571 int error; 572 int flags; 573 off_t oldsize; 574 struct tmpfs_node *node; 575 struct uvm_object *uobj; 576 577 KASSERT(VOP_ISLOCKED(vp)); 578 579 node = VP_TO_TMPFS_NODE(vp); 580 oldsize = node->tn_size; 581 582 if (uio->uio_offset < 0 || vp->v_type != VREG) { 583 error = EINVAL; 584 goto out; 585 } 586 587 if (uio->uio_resid == 0) { 588 error = 0; 589 goto out; 590 } 591 592 if (ioflag & IO_APPEND) 593 uio->uio_offset = node->tn_size; 594 595 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 596 if (extended) { 597 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 598 if (error != 0) 599 goto out; 600 } 601 602 uobj = node->tn_spec.tn_reg.tn_aobj; 603 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 604 error = 0; 605 while (error == 0 && uio->uio_resid > 0) { 606 vsize_t len; 607 void *win; 608 609 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 610 if (len == 0) 611 break; 612 613 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 614 UBC_WRITE); 615 error = uiomove(win, len, uio); 616 ubc_release(win, flags); 617 } 618 619 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 620 (extended ? TMPFS_NODE_CHANGED : 0); 621 622 if (error != 0) 623 (void)tmpfs_reg_resize(vp, oldsize); 624 625 VN_KNOTE(vp, NOTE_WRITE); 626 627out: 628 KASSERT(VOP_ISLOCKED(vp)); 629 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 630 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 631 632 return error; 633} 634 635/* --------------------------------------------------------------------- */ 636 637int 638tmpfs_fsync(void *v) 639{ 640 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 641 642 KASSERT(VOP_ISLOCKED(vp)); 643 644 tmpfs_update(vp, NULL, NULL, 0); 645 646 return 0; 647} 648 649/* --------------------------------------------------------------------- */ 650 651int 652tmpfs_remove(void *v) 653{ 654 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 655 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 656 657 int error; 658 struct tmpfs_dirent *de; 659 struct tmpfs_mount *tmp; 660 struct tmpfs_node *dnode; 661 struct tmpfs_node *node; 662 663 KASSERT(VOP_ISLOCKED(dvp)); 664 KASSERT(VOP_ISLOCKED(vp)); 665 666 if (vp->v_type == VDIR) { 667 error = EPERM; 668 goto out; 669 } 670 671 dnode = VP_TO_TMPFS_DIR(dvp); 672 node = VP_TO_TMPFS_NODE(vp); 673 tmp = VFS_TO_TMPFS(vp->v_mount); 674 de = node->tn_lookup_dirent; 675 KASSERT(de != NULL); 676 677 /* Files marked as immutable or append-only cannot be deleted. */ 678 if (node->tn_flags & (IMMUTABLE | APPEND)) { 679 error = EPERM; 680 goto out; 681 } 682 683 /* Remove the entry from the directory; as it is a file, we do not 684 * have to change the number of hard links of the directory. */ 685 tmpfs_dir_detach(dvp, de); 686 687 /* Free the directory entry we just deleted. Note that the node 688 * referred by it will not be removed until the vnode is really 689 * reclaimed. */ 690 tmpfs_free_dirent(tmp, de, TRUE); 691 692 error = 0; 693 694out: 695 vput(vp); 696 if (dvp == vp) 697 vrele(dvp); 698 else 699 vput(dvp); 700 701 KASSERT(!VOP_ISLOCKED(dvp)); 702 703 return error; 704} 705 706/* --------------------------------------------------------------------- */ 707 708int 709tmpfs_link(void *v) 710{ 711 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 712 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 713 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 714 715 int error; 716 struct tmpfs_dirent *de; 717 struct tmpfs_node *dnode; 718 struct tmpfs_node *node; 719 720 KASSERT(VOP_ISLOCKED(dvp)); 721 KASSERT(!VOP_ISLOCKED(vp)); 722 KASSERT(cnp->cn_flags & HASBUF); 723 KASSERT(dvp != vp); /* XXX When can this be false? */ 724 725 dnode = VP_TO_TMPFS_DIR(dvp); 726 node = VP_TO_TMPFS_NODE(vp); 727 728 /* Lock vp because we will need to run tmpfs_update over it, which 729 * needs the vnode to be locked. */ 730 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 731 if (error != 0) 732 goto out; 733 734 /* XXX: Why aren't the following two tests done by the caller? */ 735 736 /* Hard links of directories are forbidden. */ 737 if (vp->v_type == VDIR) { 738 error = EPERM; 739 goto out; 740 } 741 742 /* Cannot create cross-device links. */ 743 if (dvp->v_mount != vp->v_mount) { 744 error = EXDEV; 745 goto out; 746 } 747 748 /* Ensure that we do not overflow the maximum number of links imposed 749 * by the system. */ 750 KASSERT(node->tn_links <= LINK_MAX); 751 if (node->tn_links == LINK_MAX) { 752 error = EMLINK; 753 goto out; 754 } 755 756 /* We cannot create links of files marked immutable or append-only. */ 757 if (node->tn_flags & (IMMUTABLE | APPEND)) { 758 error = EPERM; 759 goto out; 760 } 761 762 /* Allocate a new directory entry to represent the node. */ 763 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 764 cnp->cn_nameptr, cnp->cn_namelen, &de); 765 if (error != 0) 766 goto out; 767 768 /* Insert the new directory entry into the appropriate directory. */ 769 tmpfs_dir_attach(dvp, de); 770 771 /* vp link count has changed, so update node times. */ 772 node->tn_status |= TMPFS_NODE_CHANGED; 773 tmpfs_update(vp, NULL, NULL, 0); 774 775 error = 0; 776 777out: 778 if (VOP_ISLOCKED(vp)) 779 VOP_UNLOCK(vp, 0); 780 781 PNBUF_PUT(cnp->cn_pnbuf); 782 783 vput(dvp); 784 785 /* XXX Locking status of dvp does not match manual page. */ 786 KASSERT(!VOP_ISLOCKED(dvp)); 787 KASSERT(!VOP_ISLOCKED(vp)); 788 789 return error; 790} 791 792/* --------------------------------------------------------------------- */ 793 794int 795tmpfs_rename(void *v) 796{ 797 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 798 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 799 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 800 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 801 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 802 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 803 804 char *newname; 805 int error; 806 struct tmpfs_dirent *de; 807 struct tmpfs_mount *tmp; 808 struct tmpfs_node *fdnode; 809 struct tmpfs_node *fnode; 810 struct tmpfs_node *tdnode; 811 812 KASSERT(VOP_ISLOCKED(tdvp)); 813 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 814 KASSERT(fcnp->cn_flags & HASBUF); 815 KASSERT(tcnp->cn_flags & HASBUF); 816 817 fdnode = VP_TO_TMPFS_DIR(fdvp); 818 fnode = VP_TO_TMPFS_NODE(fvp); 819 de = fnode->tn_lookup_dirent; 820 821 /* Disallow cross-device renames. 822 * XXX Why isn't this done by the caller? */ 823 if (fvp->v_mount != tdvp->v_mount || 824 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 825 error = EXDEV; 826 goto out; 827 } 828 829 tmp = VFS_TO_TMPFS(tdvp->v_mount); 830 tdnode = VP_TO_TMPFS_DIR(tdvp); 831 832 /* If source and target are the same file, there is nothing to do. */ 833 if (fvp == tvp) { 834 error = 0; 835 goto out; 836 } 837 838 /* Avoid manipulating '.' and '..' entries. */ 839 if (de == NULL) { 840 KASSERT(fvp->v_type == VDIR); 841 error = EINVAL; 842 goto out; 843 } 844 KASSERT(de->td_node == fnode); 845 846 /* If we need to move the directory between entries, lock the 847 * source so that we can safely operate on it. */ 848 if (fdnode != tdnode) { 849 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 850 if (error != 0) 851 goto out; 852 } 853 854 /* Ensure that we have enough memory to hold the new name, if it 855 * has to be changed. */ 856 if (fcnp->cn_namelen != tcnp->cn_namelen || 857 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 858 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 859 tcnp->cn_namelen, 0); 860 if (newname == NULL) { 861 error = ENOSPC; 862 goto out_locked; 863 } 864 } else 865 newname = NULL; 866 867 /* If the node is being moved to another directory, we have to do 868 * the move. */ 869 if (fdnode != tdnode) { 870 /* In case we are moving a directory, we have to adjust its 871 * parent to point to the new parent. */ 872 if (de->td_node->tn_type == VDIR) { 873 struct tmpfs_node *n; 874 875 /* Ensure the target directory is not a child of the 876 * directory being moved. Otherwise, we'd end up 877 * with stale nodes. */ 878 n = tdnode; 879 while (n != n->tn_spec.tn_dir.tn_parent) { 880 if (n == fnode) { 881 error = EINVAL; 882 goto out_locked; 883 } 884 n = n->tn_spec.tn_dir.tn_parent; 885 } 886 887 /* Adjust the parent pointer. */ 888 TMPFS_VALIDATE_DIR(fnode); 889 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 890 891 /* As a result of changing the target of the '..' 892 * entry, the link count of the source and target 893 * directories has to be adjusted. */ 894 fdnode->tn_links--; 895 tdnode->tn_links++; 896 } 897 898 /* Do the move: just remove the entry from the source directory 899 * and insert it into the target one. */ 900 tmpfs_dir_detach(fdvp, de); 901 tmpfs_dir_attach(tdvp, de); 902 903 /* Notify listeners of fdvp about the change in the directory. 904 * We can do it at this point because we aren't touching fdvp 905 * any more below. */ 906 VN_KNOTE(fdvp, NOTE_WRITE); 907 } 908 909 /* If the name has changed, we need to make it effective by changing 910 * it in the directory entry. */ 911 if (newname != NULL) { 912 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 913 KASSERT(tcnp->cn_namelen < 0xffff); 914 915 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 916 de->td_namelen); 917 de->td_namelen = (uint16_t)tcnp->cn_namelen; 918 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 919 de->td_name = newname; 920 921 fnode->tn_status |= TMPFS_NODE_CHANGED; 922 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 923 } 924 925 /* If we are overwriting an entry, we have to remove the old one 926 * from the target directory. */ 927 if (tvp != NULL) { 928 struct tmpfs_node *tnode; 929 930 tnode = VP_TO_TMPFS_NODE(tvp); 931 932 /* The source node cannot be a directory in this case. */ 933 KASSERT(fnode->tn_type != VDIR); 934 935 /* Remove the old entry from the target directory. */ 936 de = tnode->tn_lookup_dirent; 937 tmpfs_dir_detach(tdvp, de); 938 939 /* Free the directory entry we just deleted. Note that the 940 * node referred by it will not be removed until the vnode is 941 * really reclaimed. */ 942 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 943 } 944 945 /* Notify listeners of tdvp about the change in the directory (either 946 * because a new entry was added or because one was removed) and 947 * listeners of fvp about the rename. */ 948 VN_KNOTE(tdvp, NOTE_WRITE); 949 VN_KNOTE(fvp, NOTE_RENAME); 950 951 error = 0; 952 953out_locked: 954 if (fdnode != tdnode) 955 VOP_UNLOCK(fdvp, 0); 956 957out: 958 /* Release target nodes. */ 959 /* XXX: I don't understand when tdvp can be the same as tvp, but 960 * other code takes care of this... */ 961 if (tdvp == tvp) 962 vrele(tdvp); 963 else 964 vput(tdvp); 965 if (tvp != NULL) 966 vput(tvp); 967 968 /* Release source nodes. */ 969 vrele(fdvp); 970 vrele(fvp); 971 972 return error; 973} 974 975/* --------------------------------------------------------------------- */ 976 977int 978tmpfs_mkdir(void *v) 979{ 980 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 981 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 982 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 983 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 984 985 KASSERT(vap->va_type == VDIR); 986 987 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 988} 989 990/* --------------------------------------------------------------------- */ 991 992int 993tmpfs_rmdir(void *v) 994{ 995 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 996 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 997 998 int error; 999 struct tmpfs_dirent *de; 1000 struct tmpfs_mount *tmp; 1001 struct tmpfs_node *dnode; 1002 struct tmpfs_node *node; 1003 1004 KASSERT(VOP_ISLOCKED(dvp)); 1005 KASSERT(VOP_ISLOCKED(vp)); 1006 1007 tmp = VFS_TO_TMPFS(dvp->v_mount); 1008 dnode = VP_TO_TMPFS_DIR(dvp); 1009 node = VP_TO_TMPFS_DIR(vp); 1010 1011 /* Directories with more than two entries ('.' and '..') cannot be 1012 * removed. */ 1013 if (node->tn_size > 0) { 1014 error = ENOTEMPTY; 1015 goto out; 1016 } 1017 1018 /* This invariant holds only if we are not trying to remove "..". 1019 * We checked for that above so this is safe now. */ 1020 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1021 1022 /* Get the directory entry associated with node (vp). This was 1023 * filled by tmpfs_lookup while looking up the entry. */ 1024 de = node->tn_lookup_dirent; 1025 KASSERT(TMPFS_DIRENT_MATCHES(de, 1026 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1027 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1028 1029 /* Check flags to see if we are allowed to remove the directory. */ 1030 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1031 error = EPERM; 1032 goto out; 1033 } 1034 1035 /* Detach the directory entry from the directory (dnode). */ 1036 tmpfs_dir_detach(dvp, de); 1037 1038 node->tn_links--; 1039 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1040 TMPFS_NODE_MODIFIED; 1041 node->tn_spec.tn_dir.tn_parent->tn_links--; 1042 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1043 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1044 1045 /* Release the parent. */ 1046 cache_purge(dvp); /* XXX Is this needed? */ 1047 vput(dvp); 1048 1049 /* Free the directory entry we just deleted. Note that the node 1050 * referred by it will not be removed until the vnode is really 1051 * reclaimed. */ 1052 tmpfs_free_dirent(tmp, de, TRUE); 1053 1054 /* Release the deleted vnode (will destroy the node, notify 1055 * interested parties and clean it from the cache). */ 1056 vput(vp); 1057 1058 error = 0; 1059 1060out: 1061 if (error != 0) { 1062 vput(dvp); 1063 vput(vp); 1064 } 1065 1066 return error; 1067} 1068 1069/* --------------------------------------------------------------------- */ 1070 1071int 1072tmpfs_symlink(void *v) 1073{ 1074 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1075 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1076 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1077 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1078 char *target = ((struct vop_symlink_args *)v)->a_target; 1079 1080 KASSERT(vap->va_type == VLNK); 1081 1082 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1083} 1084 1085/* --------------------------------------------------------------------- */ 1086 1087int 1088tmpfs_readdir(void *v) 1089{ 1090 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1091 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1092 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1093 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1094 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1095 1096 int error; 1097 off_t startoff; 1098 off_t cnt; 1099 struct tmpfs_node *node; 1100 1101 KASSERT(VOP_ISLOCKED(vp)); 1102 1103 /* This operation only makes sense on directory nodes. */ 1104 if (vp->v_type != VDIR) { 1105 error = ENOTDIR; 1106 goto out; 1107 } 1108 1109 node = VP_TO_TMPFS_DIR(vp); 1110 1111 startoff = uio->uio_offset; 1112 1113 cnt = 0; 1114 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1115 error = tmpfs_dir_getdotdent(node, uio); 1116 if (error == -1) { 1117 error = 0; 1118 goto outok; 1119 } else if (error != 0) 1120 goto outok; 1121 cnt++; 1122 } 1123 1124 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1125 error = tmpfs_dir_getdotdotdent(node, uio); 1126 if (error == -1) { 1127 error = 0; 1128 goto outok; 1129 } else if (error != 0) 1130 goto outok; 1131 cnt++; 1132 } 1133 1134 error = tmpfs_dir_getdents(node, uio, &cnt); 1135 if (error == -1) 1136 error = 0; 1137 KASSERT(error >= 0); 1138 1139outok: 1140 /* This label assumes that startoff has been 1141 * initialized. If the compiler didn't spit out warnings, we'd 1142 * simply make this one be 'out' and drop 'outok'. */ 1143 1144 if (eofflag != NULL) 1145 *eofflag = 1146 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1147 1148 /* Update NFS-related variables. */ 1149 if (error == 0 && cookies != NULL && ncookies != NULL) { 1150 off_t i; 1151 off_t off = startoff; 1152 struct tmpfs_dirent *de = NULL; 1153 1154 *ncookies = cnt; 1155 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1156 1157 for (i = 0; i < cnt; i++) { 1158 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1159 if (off == TMPFS_DIRCOOKIE_DOT) { 1160 off = TMPFS_DIRCOOKIE_DOTDOT; 1161 } else { 1162 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1163 de = TAILQ_FIRST(&node->tn_spec. 1164 tn_dir.tn_dir); 1165 } else if (de != NULL) { 1166 de = TAILQ_NEXT(de, td_entries); 1167 } else { 1168 de = tmpfs_dir_lookupbycookie(node, 1169 off); 1170 KASSERT(de != NULL); 1171 de = TAILQ_NEXT(de, td_entries); 1172 } 1173 if (de == NULL) { 1174 off = TMPFS_DIRCOOKIE_EOF; 1175 } else { 1176 off = tmpfs_dircookie(de); 1177 } 1178 } 1179 1180 (*cookies)[i] = off; 1181 } 1182 KASSERT(uio->uio_offset == off); 1183 } 1184 1185out: 1186 KASSERT(VOP_ISLOCKED(vp)); 1187 1188 return error; 1189} 1190 1191/* --------------------------------------------------------------------- */ 1192 1193int 1194tmpfs_readlink(void *v) 1195{ 1196 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1197 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1198 1199 int error; 1200 struct tmpfs_node *node; 1201 1202 KASSERT(VOP_ISLOCKED(vp)); 1203 KASSERT(uio->uio_offset == 0); 1204 KASSERT(vp->v_type == VLNK); 1205 1206 node = VP_TO_TMPFS_NODE(vp); 1207 1208 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1209 MIN(node->tn_size, uio->uio_resid), uio); 1210 node->tn_status |= TMPFS_NODE_ACCESSED; 1211 1212 KASSERT(VOP_ISLOCKED(vp)); 1213 1214 return error; 1215} 1216 1217/* --------------------------------------------------------------------- */ 1218 1219int 1220tmpfs_inactive(void *v) 1221{ 1222 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1223 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1224 1225 struct tmpfs_node *node; 1226 1227 KASSERT(VOP_ISLOCKED(vp)); 1228 1229 node = VP_TO_TMPFS_NODE(vp); 1230 1231 VOP_UNLOCK(vp, 0); 1232 1233 if (node->tn_links == 0) 1234 vrecycle(vp, NULL, l); 1235 1236 return 0; 1237} 1238 1239/* --------------------------------------------------------------------- */ 1240 1241int 1242tmpfs_reclaim(void *v) 1243{ 1244 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1245 1246 struct tmpfs_mount *tmp; 1247 struct tmpfs_node *node; 1248 1249 KASSERT(!VOP_ISLOCKED(vp)); 1250 1251 node = VP_TO_TMPFS_NODE(vp); 1252 tmp = VFS_TO_TMPFS(vp->v_mount); 1253 1254 cache_purge(vp); 1255 tmpfs_free_vp(vp); 1256 1257 /* If the node referenced by this vnode was deleted by the user, 1258 * we must free its associated data structures (now that the vnode 1259 * is being reclaimed). */ 1260 if (node->tn_links == 0) 1261 tmpfs_free_node(tmp, node); 1262 1263 KASSERT(!VOP_ISLOCKED(vp)); 1264 KASSERT(vp->v_data == NULL); 1265 1266 return 0; 1267} 1268 1269/* --------------------------------------------------------------------- */ 1270 1271int 1272tmpfs_print(void *v) 1273{ 1274 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1275 1276 struct tmpfs_node *node; 1277 1278 node = VP_TO_TMPFS_NODE(vp); 1279 1280 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1281 node, node->tn_flags, node->tn_links); 1282 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1283 ", status 0x%x\n", 1284 node->tn_mode, node->tn_uid, node->tn_gid, 1285 (uintmax_t)node->tn_size, node->tn_status); 1286 1287 if (vp->v_type == VFIFO) 1288 fifo_printinfo(vp); 1289 lockmgr_printinfo(&vp->v_lock); 1290 1291 printf("\n"); 1292 1293 return 0; 1294} 1295 1296/* --------------------------------------------------------------------- */ 1297 1298int 1299tmpfs_pathconf(void *v) 1300{ 1301 int name = ((struct vop_pathconf_args *)v)->a_name; 1302 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1303 1304 int error; 1305 1306 error = 0; 1307 1308 switch (name) { 1309 case _PC_LINK_MAX: 1310 *retval = LINK_MAX; 1311 break; 1312 1313 case _PC_NAME_MAX: 1314 *retval = NAME_MAX; 1315 break; 1316 1317 case _PC_PATH_MAX: 1318 *retval = PATH_MAX; 1319 break; 1320 1321 case _PC_PIPE_BUF: 1322 *retval = PIPE_BUF; 1323 break; 1324 1325 case _PC_CHOWN_RESTRICTED: 1326 *retval = 1; 1327 break; 1328 1329 case _PC_NO_TRUNC: 1330 *retval = 1; 1331 break; 1332 1333 case _PC_SYNC_IO: 1334 *retval = 1; 1335 break; 1336 1337 case _PC_FILESIZEBITS: 1338 *retval = 0; /* XXX Don't know which value should I return. */ 1339 break; 1340 1341 default: 1342 error = EINVAL; 1343 } 1344 1345 return error; 1346} 1347 1348/* --------------------------------------------------------------------- */ 1349 1350int 1351tmpfs_advlock(void *v) 1352{ 1353 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1354 1355 struct tmpfs_node *node; 1356 1357 node = VP_TO_TMPFS_NODE(vp); 1358 1359 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1360} 1361 1362/* --------------------------------------------------------------------- */ 1363 1364int 1365tmpfs_getpages(void *v) 1366{ 1367 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1368 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1369 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1370 int *count = ((struct vop_getpages_args *)v)->a_count; 1371 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1372 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1373 int advice = ((struct vop_getpages_args *)v)->a_advice; 1374 int flags = ((struct vop_getpages_args *)v)->a_flags; 1375 1376 int error; 1377 int i; 1378 struct tmpfs_node *node; 1379 struct uvm_object *uobj; 1380 int npages = *count; 1381 1382 KASSERT(vp->v_type == VREG); 1383 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1384 1385 node = VP_TO_TMPFS_NODE(vp); 1386 uobj = node->tn_spec.tn_reg.tn_aobj; 1387 1388 /* We currently don't rely on PGO_PASTEOF. */ 1389 1390 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1391 if ((flags & PGO_LOCKED) == 0) 1392 simple_unlock(&vp->v_interlock); 1393 return EINVAL; 1394 } 1395 1396 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1397 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1398 } 1399 1400 if ((flags & PGO_LOCKED) != 0) 1401 return EBUSY; 1402 1403 if ((flags & PGO_NOTIMESTAMP) == 0) { 1404 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1405 node->tn_status |= TMPFS_NODE_ACCESSED; 1406 1407 if ((access_type & VM_PROT_WRITE) != 0) 1408 node->tn_status |= TMPFS_NODE_MODIFIED; 1409 } 1410 1411 simple_unlock(&vp->v_interlock); 1412 1413 /* 1414 * Make sure that the array on which we will store the 1415 * gotten pages is clean. Otherwise uao_get (pointed to by 1416 * the pgo_get below) gets confused and does not return the 1417 * appropriate pages. 1418 * 1419 * XXX This shall be revisited when kern/32166 is addressed 1420 * because the loop to clean m[i] will most likely be redundant 1421 * as well as the PGO_ALLPAGES flag. 1422 */ 1423 if (m != NULL) 1424 for (i = 0; i < npages; i++) 1425 m[i] = NULL; 1426 simple_lock(&uobj->vmobjlock); 1427 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1428 access_type, advice, flags | PGO_ALLPAGES); 1429#if defined(DEBUG) 1430 { 1431 /* Make sure that all the pages we return are valid. */ 1432 int dbgi; 1433 if (error == 0 && m != NULL) 1434 for (dbgi = 0; dbgi < npages; dbgi++) 1435 KASSERT(m[dbgi] != NULL); 1436 } 1437#endif 1438 1439 return error; 1440} 1441 1442/* --------------------------------------------------------------------- */ 1443 1444int 1445tmpfs_putpages(void *v) 1446{ 1447 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1448 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1449 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1450 int flags = ((struct vop_putpages_args *)v)->a_flags; 1451 1452 int error; 1453 struct tmpfs_node *node; 1454 struct uvm_object *uobj; 1455 1456 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1457 1458 node = VP_TO_TMPFS_NODE(vp); 1459 1460 if (vp->v_type != VREG) { 1461 simple_unlock(&vp->v_interlock); 1462 return 0; 1463 } 1464 1465 uobj = node->tn_spec.tn_reg.tn_aobj; 1466 simple_unlock(&vp->v_interlock); 1467 1468 simple_lock(&uobj->vmobjlock); 1469 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1470 1471 /* XXX mtime */ 1472 1473 return error; 1474} 1475