tmpfs_vnops.c revision 1.12
1/* $NetBSD: tmpfs_vnops.c,v 1.12 2005/09/23 15:36:15 jmmv Exp $ */ 2 3/* 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, 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 1.12 2005/09/23 15:36:15 jmmv 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 59#include <uvm/uvm.h> 60 61#include <miscfs/fifofs/fifo.h> 62#include <fs/tmpfs/tmpfs_vnops.h> 63#include <fs/tmpfs/tmpfs.h> 64 65/* --------------------------------------------------------------------- */ 66 67/* 68 * vnode operations vector used for files stored in a tmpfs file system. 69 */ 70int (**tmpfs_vnodeop_p)(void *); 71const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 72 { &vop_default_desc, vn_default_error }, 73 { &vop_lookup_desc, tmpfs_lookup }, 74 { &vop_create_desc, tmpfs_create }, 75 { &vop_mknod_desc, tmpfs_mknod }, 76 { &vop_open_desc, tmpfs_open }, 77 { &vop_close_desc, tmpfs_close }, 78 { &vop_access_desc, tmpfs_access }, 79 { &vop_getattr_desc, tmpfs_getattr }, 80 { &vop_setattr_desc, tmpfs_setattr }, 81 { &vop_read_desc, tmpfs_read }, 82 { &vop_write_desc, tmpfs_write }, 83 { &vop_ioctl_desc, tmpfs_ioctl }, 84 { &vop_fcntl_desc, tmpfs_fcntl }, 85 { &vop_poll_desc, tmpfs_poll }, 86 { &vop_kqfilter_desc, tmpfs_kqfilter }, 87 { &vop_revoke_desc, tmpfs_revoke }, 88 { &vop_mmap_desc, tmpfs_mmap }, 89 { &vop_fsync_desc, tmpfs_fsync }, 90 { &vop_seek_desc, tmpfs_seek }, 91 { &vop_remove_desc, tmpfs_remove }, 92 { &vop_link_desc, tmpfs_link }, 93 { &vop_rename_desc, tmpfs_rename }, 94 { &vop_mkdir_desc, tmpfs_mkdir }, 95 { &vop_rmdir_desc, tmpfs_rmdir }, 96 { &vop_symlink_desc, tmpfs_symlink }, 97 { &vop_readdir_desc, tmpfs_readdir }, 98 { &vop_readlink_desc, tmpfs_readlink }, 99 { &vop_abortop_desc, tmpfs_abortop }, 100 { &vop_inactive_desc, tmpfs_inactive }, 101 { &vop_reclaim_desc, tmpfs_reclaim }, 102 { &vop_lock_desc, tmpfs_lock }, 103 { &vop_unlock_desc, tmpfs_unlock }, 104 { &vop_bmap_desc, tmpfs_bmap }, 105 { &vop_strategy_desc, tmpfs_strategy }, 106 { &vop_print_desc, tmpfs_print }, 107 { &vop_pathconf_desc, tmpfs_pathconf }, 108 { &vop_islocked_desc, tmpfs_islocked }, 109 { &vop_advlock_desc, tmpfs_advlock }, 110 { &vop_blkatoff_desc, tmpfs_blkatoff }, 111 { &vop_valloc_desc, tmpfs_valloc }, 112 { &vop_reallocblks_desc, tmpfs_reallocblks }, 113 { &vop_vfree_desc, tmpfs_vfree }, 114 { &vop_truncate_desc, tmpfs_truncate }, 115 { &vop_update_desc, tmpfs_update }, 116 { &vop_lease_desc, tmpfs_lease }, 117 { &vop_bwrite_desc, tmpfs_bwrite }, 118 { &vop_getpages_desc, tmpfs_getpages }, 119 { &vop_putpages_desc, tmpfs_putpages }, 120 { NULL, NULL } 121}; 122const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 123 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 124 125/* --------------------------------------------------------------------- */ 126 127int 128tmpfs_lookup(void *v) 129{ 130 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 131 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 132 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 133 134 int error; 135 struct tmpfs_dirent *de; 136 struct tmpfs_node *dnode; 137 138 KASSERT(VOP_ISLOCKED(dvp)); 139 140 dnode = VP_TO_TMPFS_DIR(dvp); 141 *vpp = NULL; 142 143 /* Check accessibility of requested node as a first step. */ 144 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc); 145 if (error != 0) 146 goto out; 147 148 /* If requesting the last path component on a read-only file system 149 * with a write operation, deny it. */ 150 if ((cnp->cn_flags & ISLASTCN) && 151 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 152 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 153 error = EROFS; 154 goto out; 155 } 156 157 /* Avoid doing a linear scan of the directory if the requested 158 * directory/name couple is already in the cache. */ 159 error = cache_lookup(dvp, vpp, cnp); 160 if (error >= 0) 161 goto out; 162 163 /* We cannot be requesting the parent directory of the root node. */ 164 KASSERT(IMPLIES(dnode->tn_type == VDIR && 165 dnode->tn_parent == dnode, !(cnp->cn_flags & ISDOTDOT))); 166 167 if (cnp->cn_flags & ISDOTDOT) { 168 VOP_UNLOCK(dvp, 0); 169 170 /* Allocate a new vnode on the matching entry. */ 171 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_parent, vpp); 172 173 if (cnp->cn_flags & LOCKPARENT && 174 cnp->cn_flags & ISLASTCN) { 175 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 176 cnp->cn_flags |= PDIRUNLOCK; 177 } 178 dnode->tn_parent->tn_lookup_dirent = NULL; 179 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 180 VREF(dvp); 181 *vpp = dvp; 182 dnode->tn_lookup_dirent = NULL; 183 error = 0; 184 } else { 185 de = tmpfs_dir_lookup(dnode, cnp); 186 if (de == NULL) { 187 /* The entry was not found in the directory. 188 * This is OK iff we are creating or renaming an 189 * entry and are working on the last component of 190 * the path name. */ 191 if ((cnp->cn_flags & ISLASTCN) && 192 (cnp->cn_nameiop == CREATE || \ 193 cnp->cn_nameiop == RENAME)) { 194 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 195 cnp->cn_proc); 196 if (error != 0) 197 goto out; 198 199 /* Keep the component name in the buffer for 200 * future uses. */ 201 cnp->cn_flags |= SAVENAME; 202 203 error = EJUSTRETURN; 204 } else 205 error = ENOENT; 206 } else { 207 struct tmpfs_node *tnode; 208 209 /* The entry was found, so get its associated 210 * tmpfs_node. */ 211 tnode = de->td_node; 212 213 /* If we are not at the last path component and 214 * found a non-directory entry, raise an error. */ 215 if ((tnode->tn_type != VDIR) && 216 !(cnp->cn_flags & ISLASTCN)) { 217 error = ENOTDIR; 218 goto out; 219 } 220 221 /* If we are deleting or renaming the entry, keep 222 * track of its tmpfs_dirent so that it can be 223 * easily deleted later. */ 224 if ((cnp->cn_flags & ISLASTCN) && 225 (cnp->cn_nameiop == DELETE || 226 cnp->cn_nameiop == RENAME)) { 227 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 228 cnp->cn_proc); 229 if (error != 0) 230 goto out; 231 /* TODO: Check sticky bit. */ 232 tnode->tn_lookup_dirent = de; 233 } 234 235 /* Allocate a new vnode on the matching entry. */ 236 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 237 238 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 239 !(cnp->cn_flags & ISLASTCN))) 240 VOP_UNLOCK(dvp, 0); 241 } 242 } 243 244 /* Store the result of this lookup in the cache. Avoid this if the 245 * request was for creation, as it does not improve timings on 246 * emprical tests. */ 247 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 248 cache_enter(dvp, *vpp, cnp); 249 250out: 251 /* If there were no errors, *vpp cannot be null and it must be 252 * locked. */ 253 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 254 255 /* dvp has to be locked if: 256 * - There were errors and relocking of dvp did not fail. 257 * - We are doing a '..' lookup, relocking of dvp did not fail 258 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 259 * - LOCKPARENT and ISLASTCN are set. */ 260 KASSERT(IMPLIES( 261 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 262 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 263 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 264 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 265 , 266 VOP_ISLOCKED(dvp))); 267 268 return error; 269} 270 271/* --------------------------------------------------------------------- */ 272 273int 274tmpfs_create(void *v) 275{ 276 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 277 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 278 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 279 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 280 281 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 282 283 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 284} 285/* --------------------------------------------------------------------- */ 286 287int 288tmpfs_mknod(void *v) 289{ 290 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 291 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 292 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 293 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 294 295 if (vap->va_type != VBLK && vap->va_type != VCHR && 296 vap->va_type != VFIFO) 297 return EINVAL; 298 299 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 300} 301 302/* --------------------------------------------------------------------- */ 303 304int 305tmpfs_open(void *v) 306{ 307 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 308 int mode = ((struct vop_open_args *)v)->a_mode; 309 310 int error; 311 struct tmpfs_node *node; 312 313 KASSERT(VOP_ISLOCKED(vp)); 314 315 node = VP_TO_TMPFS_NODE(vp); 316 KASSERT(node->tn_links > 0); 317 318 /* If the file is marked append-only, deny write requests. */ 319 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 320 error = EPERM; 321 else 322 error = 0; 323 324 KASSERT(VOP_ISLOCKED(vp)); 325 326 return error; 327} 328 329/* --------------------------------------------------------------------- */ 330 331int 332tmpfs_close(void *v) 333{ 334 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 335 336 int error; 337 struct tmpfs_node *node; 338 339 KASSERT(VOP_ISLOCKED(vp)); 340 341 node = VP_TO_TMPFS_NODE(vp); 342 343 if (node->tn_links > 0) { 344 /* Update node times. No need to do it if the node has 345 * been deleted, because it will vanish after we return. */ 346 error = VOP_UPDATE(vp, NULL, NULL, UPDATE_CLOSE); 347 } else 348 error = 0; 349 350 return error; 351} 352 353/* --------------------------------------------------------------------- */ 354 355int 356tmpfs_access(void *v) 357{ 358 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 359 int mode = ((struct vop_access_args *)v)->a_mode; 360 struct ucred *cred = ((struct vop_access_args *)v)->a_cred; 361 362 int error; 363 struct tmpfs_node *node; 364 365 KASSERT(VOP_ISLOCKED(vp)); 366 367 node = VP_TO_TMPFS_NODE(vp); 368 369 switch (vp->v_type) { 370 case VDIR: 371 /* FALLTHROUGH */ 372 case VLNK: 373 /* FALLTHROUGH */ 374 case VREG: 375 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 376 error = EROFS; 377 goto out; 378 } 379 break; 380 381 case VBLK: 382 /* FALLTHROUGH */ 383 case VCHR: 384 /* FALLTHROUGH */ 385 case VSOCK: 386 /* FALLTHROUGH */ 387 case VFIFO: 388 break; 389 390 default: 391 error = EINVAL; 392 goto out; 393 } 394 395 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 396 error = EPERM; 397 goto out; 398 } 399 400 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 401 node->tn_gid, mode, cred); 402 403out: 404 KASSERT(VOP_ISLOCKED(vp)); 405 406 return error; 407} 408 409/* --------------------------------------------------------------------- */ 410 411int 412tmpfs_getattr(void *v) 413{ 414 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 415 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 416 417 struct tmpfs_node *node; 418 419 node = VP_TO_TMPFS_NODE(vp); 420 421 VATTR_NULL(vap); 422 423 vap->va_type = vp->v_type; 424 vap->va_mode = node->tn_mode; 425 vap->va_nlink = node->tn_links; 426 vap->va_uid = node->tn_uid; 427 vap->va_gid = node->tn_gid; 428 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 429 vap->va_fileid = node->tn_id; 430 vap->va_size = node->tn_size; 431 vap->va_blocksize = PAGE_SIZE; 432 vap->va_atime = node->tn_atime; 433 vap->va_mtime = node->tn_mtime; 434 vap->va_ctime = node->tn_ctime; 435 vap->va_birthtime = node->tn_birthtime; 436 vap->va_gen = node->tn_gen; 437 vap->va_flags = node->tn_flags; 438 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 439 node->tn_rdev : VNOVAL; 440 vap->va_bytes = round_page(node->tn_size); 441 vap->va_filerev = VNOVAL; 442 vap->va_vaflags = 0; 443 vap->va_spare = VNOVAL; /* XXX */ 444 445 return 0; 446} 447 448/* --------------------------------------------------------------------- */ 449 450/* XXX Should this operation be atomic? I think it should, but code in 451 * XXX other places (e.g., ufs) doesn't seem to be... */ 452int 453tmpfs_setattr(void *v) 454{ 455 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 456 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 457 struct ucred *cred = ((struct vop_setattr_args *)v)->a_cred; 458 struct proc *p = ((struct vop_setattr_args *)v)->a_p; 459 460 int error, error2; 461 462 KASSERT(VOP_ISLOCKED(vp)); 463 464 error = 0; 465 466 /* Abort if any unsettable attribute is given. */ 467 if (vap->va_type != VNON || 468 vap->va_nlink != VNOVAL || 469 vap->va_fsid != VNOVAL || 470 vap->va_fileid != VNOVAL || 471 vap->va_blocksize != VNOVAL || 472 vap->va_ctime.tv_sec != VNOVAL || 473 vap->va_ctime.tv_nsec != VNOVAL || 474 vap->va_birthtime.tv_sec != VNOVAL || 475 vap->va_birthtime.tv_nsec != VNOVAL || 476 vap->va_gen != VNOVAL || 477 vap->va_rdev != VNOVAL || 478 vap->va_bytes != VNOVAL) 479 error = EINVAL; 480 481 if (error == 0 && (vap->va_flags != VNOVAL)) 482 error = tmpfs_chflags(vp, vap->va_flags, cred, p); 483 484 if (error == 0 && (vap->va_size != VNOVAL)) 485 error = tmpfs_chsize(vp, vap->va_size, cred, p); 486 487 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 488 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 489 490 if (error == 0 && (vap->va_mode != VNOVAL)) 491 error = tmpfs_chmod(vp, vap->va_mode, cred, p); 492 493 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 494 vap->va_atime.tv_nsec != VNOVAL) || 495 (vap->va_mtime.tv_sec != VNOVAL && 496 vap->va_mtime.tv_nsec != VNOVAL))) 497 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 498 vap->va_vaflags, cred, p); 499 500 /* Update the node times. We give preference to the error codes 501 * generated by this function rather than the ones that may arise 502 * from tmpfs_update. */ 503 error2 = VOP_UPDATE(vp, NULL, NULL, 0); 504 if (error == 0) 505 error = error2; 506 507 KASSERT(VOP_ISLOCKED(vp)); 508 509 return error; 510} 511 512/* --------------------------------------------------------------------- */ 513 514int 515tmpfs_read(void *v) 516{ 517 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 518 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 519 520 int error; 521 int flags; 522 struct tmpfs_node *node; 523 struct uvm_object *uobj; 524 525 KASSERT(VOP_ISLOCKED(vp)); 526 527 node = VP_TO_TMPFS_NODE(vp); 528 529 if (vp->v_type != VREG) { 530 error = EISDIR; 531 goto out; 532 } 533 534 if (uio->uio_offset < 0) { 535 error = EINVAL; 536 goto out; 537 } 538 539 node->tn_status |= TMPFS_NODE_ACCESSED; 540 541 uobj = node->tn_aobj; 542 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 543 error = 0; 544 while (error == 0 && uio->uio_resid > 0) { 545 vsize_t len; 546 void *win; 547 548 if (node->tn_size <= uio->uio_offset) 549 break; 550 551 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 552 if (len == 0) 553 break; 554 555 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_READ); 556 error = uiomove(win, len, uio); 557 ubc_release(win, flags); 558 } 559 560out: 561 KASSERT(VOP_ISLOCKED(vp)); 562 563 return error; 564} 565 566/* --------------------------------------------------------------------- */ 567 568int 569tmpfs_write(void *v) 570{ 571 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 572 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 573 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 574 575 boolean_t extended; 576 int error; 577 int flags; 578 off_t oldsize; 579 struct tmpfs_node *node; 580 struct uvm_object *uobj; 581 582 KASSERT(VOP_ISLOCKED(vp)); 583 584 node = VP_TO_TMPFS_NODE(vp); 585 oldsize = node->tn_size; 586 587 if (uio->uio_offset < 0 || vp->v_type != VREG) { 588 error = EINVAL; 589 goto out; 590 } 591 592 if (uio->uio_resid == 0) { 593 error = 0; 594 goto out; 595 } 596 597 if (ioflag & IO_APPEND) 598 uio->uio_offset = node->tn_size; 599 600 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 601 if (extended) { 602 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 603 if (error != 0) 604 goto out; 605 } 606 607 uobj = node->tn_aobj; 608 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 609 error = 0; 610 while (error == 0 && uio->uio_resid > 0) { 611 vsize_t len; 612 void *win; 613 614 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 615 if (len == 0) 616 break; 617 618 win = ubc_alloc(uobj, uio->uio_offset, &len, UBC_WRITE); 619 error = uiomove(win, len, uio); 620 ubc_release(win, flags); 621 } 622 623 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 624 (extended ? TMPFS_NODE_CHANGED : 0); 625 626 if (error != 0) 627 (void)tmpfs_reg_resize(vp, oldsize); 628 629out: 630 KASSERT(VOP_ISLOCKED(vp)); 631 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 632 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 633 634 return error; 635} 636 637/* --------------------------------------------------------------------- */ 638 639int 640tmpfs_fsync(void *v) 641{ 642 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 643 644 KASSERT(VOP_ISLOCKED(vp)); 645 646 return VOP_UPDATE(vp, NULL, NULL, 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 dnode = VP_TO_TMPFS_DIR(dvp); 667 node = VP_TO_TMPFS_NODE(vp); 668 tmp = VFS_TO_TMPFS(vp->v_mount); 669 de = node->tn_lookup_dirent; 670 KASSERT(de != NULL); 671 672 /* XXX: Why isn't this done by the caller? */ 673 if (vp->v_type == VDIR) { 674 error = EISDIR; 675 goto out; 676 } 677 678 /* Files marked as immutable or append-only cannot be deleted. */ 679 if (node->tn_flags & (IMMUTABLE | APPEND)) { 680 error = EPERM; 681 goto out; 682 } 683 684 /* Remove the entry from the directory; as it is a file, we do not 685 * have to change the number of hard links of the directory. */ 686 tmpfs_dir_detach(dvp, de); 687 688 /* Notify interested parties about the modification of dvp. 689 * The removal of vp is notified when it is reclaimed. */ 690 VN_KNOTE(dvp, NOTE_WRITE); 691 692 /* Free the directory entry we just deleted. Note that the node 693 * referred by it will not be removed until the vnode is really 694 * reclaimed. */ 695 tmpfs_free_dirent(tmp, de, TRUE); 696 697 error = 0; 698 699out: 700 vput(dvp); 701 vput(vp); 702 703 KASSERT(!VOP_ISLOCKED(dvp)); 704 705 return error; 706} 707 708/* --------------------------------------------------------------------- */ 709 710int 711tmpfs_link(void *v) 712{ 713 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 714 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 715 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 716 717 int error; 718 struct tmpfs_dirent *de; 719 struct tmpfs_node *dnode; 720 struct tmpfs_node *node; 721 722 KASSERT(VOP_ISLOCKED(dvp)); 723 KASSERT(!VOP_ISLOCKED(vp)); 724 KASSERT(cnp->cn_flags & HASBUF); 725 KASSERT(dvp != vp); /* XXX When can this be false? */ 726 727 dnode = VP_TO_TMPFS_DIR(dvp); 728 node = VP_TO_TMPFS_NODE(vp); 729 730 /* Lock vp because we will need to run VOP_UPDATE over it, which 731 * needs the vnode to be locked. */ 732 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 733 if (error != 0) 734 goto out; 735 736 /* XXX: Why aren't the following two tests done by the caller? */ 737 738 /* Hard links of directories are forbidden. */ 739 if (vp->v_type == VDIR) { 740 error = EPERM; 741 goto out; 742 } 743 744 /* Cannot create cross-device links. */ 745 if (dvp->v_mount != vp->v_mount) { 746 error = EXDEV; 747 goto out; 748 } 749 750 /* Ensure that we do not overflow the maximum number of links imposed 751 * by the system. */ 752 KASSERT(node->tn_links <= LINK_MAX); 753 if (node->tn_links == LINK_MAX) { 754 error = EMLINK; 755 goto out; 756 } 757 758 /* We cannot create links of files marked immutable or append-only. */ 759 if (node->tn_flags & (IMMUTABLE | APPEND)) { 760 error = EPERM; 761 goto out; 762 } 763 764 /* Allocate a new directory entry to represent the node. */ 765 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 766 cnp->cn_nameptr, cnp->cn_namelen, &de); 767 if (error != 0) 768 goto out; 769 770 /* Insert the new directory entry into the appropriate directory. */ 771 tmpfs_dir_attach(dvp, de); 772 VN_KNOTE(dvp, NOTE_WRITE); 773 774 /* vp link count has changed, so update node times. */ 775 node->tn_status |= TMPFS_NODE_CHANGED; 776 (void)VOP_UPDATE(vp, NULL, NULL, 0); 777 778 error = 0; 779 780out: 781 if (VOP_ISLOCKED(vp)) 782 VOP_UNLOCK(vp, 0); 783 784 PNBUF_PUT(cnp->cn_pnbuf); 785 786 vput(dvp); 787 788 /* XXX Locking status of dvp does not match manual page. */ 789 KASSERT(!VOP_ISLOCKED(dvp)); 790 KASSERT(!VOP_ISLOCKED(vp)); 791 792 return error; 793} 794 795/* --------------------------------------------------------------------- */ 796 797int 798tmpfs_rename(void *v) 799{ 800 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 801 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 802 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 803 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 804 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 805 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 806 807 char *newname; 808 int error; 809 struct tmpfs_dirent *de; 810 struct tmpfs_mount *tmp; 811 struct tmpfs_node *fdnode; 812 struct tmpfs_node *fnode; 813 struct tmpfs_node *tdnode; 814 815 KASSERT(VOP_ISLOCKED(tdvp)); 816 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 817 KASSERT(fcnp->cn_flags & HASBUF); 818 KASSERT(tcnp->cn_flags & HASBUF); 819 820 fdnode = VP_TO_TMPFS_DIR(fdvp); 821 fnode = VP_TO_TMPFS_NODE(fvp); 822 de = fnode->tn_lookup_dirent; 823 824 /* Disallow cross-device renames. 825 * XXX Why isn't this done by the caller? */ 826 if (fvp->v_mount != tdvp->v_mount || 827 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 828 error = EXDEV; 829 goto out; 830 } 831 832 tmp = VFS_TO_TMPFS(tdvp->v_mount); 833 tdnode = VP_TO_TMPFS_DIR(tdvp); 834 835 /* If source and target are the same file, there is nothing to do. */ 836 if (fvp == tvp) { 837 error = 0; 838 goto out; 839 } 840 841 /* Avoid manipulating '.' and '..' entries. */ 842 if (de == NULL) { 843 KASSERT(fvp->v_type == VDIR); 844 error = EINVAL; 845 goto out; 846 } 847 KASSERT(de->td_node == fnode); 848 849 /* If we need to move the directory between entries, lock the 850 * source so that we can safely operate on it. */ 851 if (fdnode != tdnode) { 852 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 853 if (error != 0) 854 goto out_locked; 855 } 856 857 /* Ensure that we have enough memory to hold the new name, if it 858 * has to be changed. */ 859 if (fcnp->cn_namelen != tcnp->cn_namelen || 860 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 861 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 862 tcnp->cn_namelen, 0); 863 if (newname == NULL) { 864 error = ENOSPC; 865 goto out; 866 } 867 } else 868 newname = NULL; 869 870 /* If the node is being moved to another directory, we have to do 871 * the move. */ 872 if (fdnode != tdnode) { 873 /* In case we are moving a directory, we have to adjust its 874 * parent to point to the new parent. */ 875 if (de->td_node->tn_type == VDIR) { 876 struct tmpfs_node *n; 877 878 /* Ensure the target directory is not a child of the 879 * directory being moved. Otherwise, we'd end up 880 * with stale nodes. */ 881 n = tdnode; 882 while (n != n->tn_parent) { 883 if (n == fnode) { 884 error = EINVAL; 885 goto out; 886 } 887 n = n->tn_parent; 888 } 889 890 /* Adjust the parent pointer. */ 891 TMPFS_VALIDATE_DIR(fnode); 892 de->td_node->tn_parent = tdnode; 893 894 /* As a result of changing the target of the '..' 895 * entry, the link count of the source and target 896 * directories has to be adjusted. */ 897 fdnode->tn_links--; 898 tdnode->tn_links++; 899 } 900 901 /* Do the move: just remove the entry from the source directory 902 * and insert it into the target one. */ 903 tmpfs_dir_detach(fdvp, de); 904 tmpfs_dir_attach(tdvp, de); 905 906 /* Notify listeners of fdvp about the change in the directory. 907 * We can do it at this point because we aren't touching fdvp 908 * any more below. */ 909 VN_KNOTE(fdvp, NOTE_WRITE); 910 } 911 912 /* If the name has changed, we need to make it effective by changing 913 * it in the directory entry. */ 914 if (newname != NULL) { 915 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 916 KASSERT(tcnp->cn_namelen < 0xffff); 917 918 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 919 de->td_namelen); 920 de->td_namelen = (uint16_t)tcnp->cn_namelen; 921 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 922 de->td_name = newname; 923 924 fnode->tn_status |= TMPFS_NODE_MODIFIED; 925 } 926 927 /* If we are overwriting an entry, we have to remove the old one 928 * from the target directory. */ 929 if (tvp != NULL) { 930 struct tmpfs_node *tnode; 931 932 tnode = VP_TO_TMPFS_NODE(tvp); 933 934 /* The source node cannot be a directory in this case. */ 935 KASSERT(fnode->tn_type != VDIR); 936 937 /* Remove the old entry from the target directory. */ 938 de = tnode->tn_lookup_dirent; 939 tmpfs_dir_detach(tdvp, de); 940 941 /* Free the directory entry we just deleted. Note that the 942 * node referred by it will not be removed until the vnode is 943 * really reclaimed. */ 944 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 945 } 946 947 /* Notify listeners of tdvp about the change in the directory (either 948 * because a new entry was added or because one was removed). */ 949 VN_KNOTE(tdvp, NOTE_WRITE); 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 KASSERT(node->tn_parent == dnode); 1011 1012 /* Get the directory entry associated with node (vp). This was 1013 * filled by tmpfs_lookup while looking up the entry. */ 1014 de = node->tn_lookup_dirent; 1015 KASSERT(TMPFS_DIRENT_MATCHES(de, 1016 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1017 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1018 1019 /* Directories with more than two entries ('.' and '..') cannot be 1020 * removed. */ 1021 if (node->tn_size > 0) { 1022 error = ENOTEMPTY; 1023 goto out; 1024 } 1025 1026 /* Check flags to see if we are allowed to remove the directory. */ 1027 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1028 error = EPERM; 1029 goto out; 1030 } 1031 1032 /* Detach the directory entry from the directory (dnode). */ 1033 tmpfs_dir_detach(dvp, de); 1034 1035 node->tn_links--; 1036 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1037 TMPFS_NODE_MODIFIED; 1038 node->tn_parent->tn_links--; 1039 node->tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1040 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1041 1042 /* Notify modification of parent directory and release it. */ 1043 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1044 cache_purge(dvp); /* XXX Is this needed? */ 1045 vput(dvp); 1046 1047 /* Free the directory entry we just deleted. Note that the node 1048 * referred by it will not be removed until the vnode is really 1049 * reclaimed. */ 1050 tmpfs_free_dirent(tmp, de, TRUE); 1051 1052 /* Release the deleted vnode (will destroy the node, notify 1053 * interested parties and clean it from the cache). */ 1054 vput(vp); 1055 1056 error = 0; 1057 1058out: 1059 if (error != 0) { 1060 vput(dvp); 1061 vput(vp); 1062 } 1063 1064 return error; 1065} 1066 1067/* --------------------------------------------------------------------- */ 1068 1069int 1070tmpfs_symlink(void *v) 1071{ 1072 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1073 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1074 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1075 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1076 char *target = ((struct vop_symlink_args *)v)->a_target; 1077 1078 KASSERT(vap->va_type == VLNK); 1079 1080 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1081} 1082 1083/* --------------------------------------------------------------------- */ 1084 1085int 1086tmpfs_readdir(void *v) 1087{ 1088 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1089 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1090 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1091 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1092 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1093 1094 int error; 1095 off_t startoff; 1096 off_t cnt; 1097 struct tmpfs_node *node; 1098 1099 KASSERT(VOP_ISLOCKED(vp)); 1100 1101 /* This operation only makes sense on directory nodes. */ 1102 if (vp->v_type != VDIR) { 1103 error = ENOTDIR; 1104 goto out; 1105 } 1106 1107 node = VP_TO_TMPFS_DIR(vp); 1108 1109 startoff = uio->uio_offset; 1110 1111 cnt = 0; 1112 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1113 error = tmpfs_dir_getdotdent(node, uio); 1114 if (error == -1) { 1115 error = 0; 1116 goto outok; 1117 } else if (error != 0) 1118 goto outok; 1119 cnt++; 1120 } 1121 1122 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1123 error = tmpfs_dir_getdotdotdent(node, uio); 1124 if (error == -1) { 1125 error = 0; 1126 goto outok; 1127 } else if (error != 0) 1128 goto outok; 1129 cnt++; 1130 } 1131 1132 error = tmpfs_dir_getdents(node, uio, &cnt); 1133 if (error == -1) 1134 error = 0; 1135 KASSERT(error >= 0); 1136 1137outok: 1138 /* This label assumes that startoff has been 1139 * initialized. If the compiler didn't spit out warnings, we'd 1140 * simply make this one be 'out' and drop 'outok'. */ 1141 1142 if (eofflag != NULL) 1143 *eofflag = 1144 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1145 1146 /* Update NFS-related variables. */ 1147 if (error == 0 && cookies != NULL && ncookies != NULL) { 1148 off_t i; 1149 off_t off = startoff; 1150 struct tmpfs_dirent *de = NULL; 1151 1152 *ncookies = cnt; 1153 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1154 1155 for (i = 0; i < cnt; i++) { 1156 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1157 if (off == TMPFS_DIRCOOKIE_DOT) { 1158 off = TMPFS_DIRCOOKIE_DOTDOT; 1159 } else { 1160 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1161 de = TAILQ_FIRST(&node->tn_dir); 1162 } else if (de != NULL) { 1163 de = TAILQ_NEXT(de, td_entries); 1164 } else { 1165 de = tmpfs_dir_lookupbycookie(node, 1166 off); 1167 KASSERT(de != NULL); 1168 de = TAILQ_NEXT(de, td_entries); 1169 } 1170 if (de == NULL) { 1171 off = TMPFS_DIRCOOKIE_EOF; 1172 } else { 1173 off = TMPFS_DIRCOOKIE(de); 1174 } 1175 } 1176 1177 (*cookies)[i] = off; 1178 } 1179 KASSERT(uio->uio_offset == off); 1180 } 1181 1182out: 1183 KASSERT(VOP_ISLOCKED(vp)); 1184 1185 return error; 1186} 1187 1188/* --------------------------------------------------------------------- */ 1189 1190int 1191tmpfs_readlink(void *v) 1192{ 1193 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1194 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1195 1196 int error; 1197 struct tmpfs_node *node; 1198 1199 KASSERT(VOP_ISLOCKED(vp)); 1200 KASSERT(uio->uio_offset == 0); 1201 KASSERT(vp->v_type == VLNK); 1202 1203 node = VP_TO_TMPFS_NODE(vp); 1204 1205 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1206 uio); 1207 node->tn_status |= TMPFS_NODE_ACCESSED; 1208 1209 KASSERT(VOP_ISLOCKED(vp)); 1210 1211 return error; 1212} 1213 1214/* --------------------------------------------------------------------- */ 1215 1216int 1217tmpfs_inactive(void *v) 1218{ 1219 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1220 struct proc *p = ((struct vop_inactive_args *)v)->a_p; 1221 1222 struct tmpfs_node *node; 1223 1224 KASSERT(VOP_ISLOCKED(vp)); 1225 1226 node = VP_TO_TMPFS_NODE(vp); 1227 1228 VOP_UNLOCK(vp, 0); 1229 1230 if (node->tn_links == 0) 1231 vrecycle(vp, NULL, p); 1232 1233 return 0; 1234} 1235 1236/* --------------------------------------------------------------------- */ 1237 1238int 1239tmpfs_reclaim(void *v) 1240{ 1241 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1242 1243 struct tmpfs_mount *tmp; 1244 struct tmpfs_node *node; 1245 1246 KASSERT(!VOP_ISLOCKED(vp)); 1247 1248 node = VP_TO_TMPFS_NODE(vp); 1249 tmp = VFS_TO_TMPFS(vp->v_mount); 1250 1251 if (node->tn_links == 0) 1252 VN_KNOTE(vp, NOTE_DELETE); 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_truncate(void *v) 1352{ 1353 struct vnode *vp = ((struct vop_truncate_args *)v)->a_vp; 1354 off_t length = ((struct vop_truncate_args *)v)->a_length; 1355 1356 boolean_t extended; 1357 int error; 1358 struct tmpfs_node *node; 1359 1360 node = VP_TO_TMPFS_NODE(vp); 1361 extended = length > node->tn_size; 1362 1363 if (length < 0) { 1364 error = EINVAL; 1365 goto out; 1366 } 1367 1368 if (node->tn_size == length) { 1369 error = 0; 1370 goto out; 1371 } 1372 1373 error = tmpfs_reg_resize(vp, length); 1374 if (error == 0) { 1375 VN_KNOTE(vp, NOTE_ATTRIB | (extended ? NOTE_EXTEND : 0)); 1376 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1377 } 1378 1379out: 1380 (void)VOP_UPDATE(vp, NULL, NULL, 0); 1381 1382 return error; 1383} 1384 1385/* --------------------------------------------------------------------- */ 1386 1387int 1388tmpfs_update(void *v) 1389{ 1390 struct vnode *vp = ((struct vop_update_args *)v)->a_vp; 1391 struct timespec *acc = ((struct vop_update_args *)v)->a_access; 1392 struct timespec *mod = ((struct vop_update_args *)v)->a_modify; 1393 int flags = ((struct vop_update_args *)v)->a_flags; 1394 1395 struct timespec *ts = NULL, tsb; 1396 struct tmpfs_node *node; 1397 1398 KASSERT(VOP_ISLOCKED(vp)); 1399 1400 node = VP_TO_TMPFS_NODE(vp); 1401 1402 if (flags & UPDATE_CLOSE) 1403 ; /* XXX Need to do anything special? */ 1404 1405 if (node->tn_status != 0) { 1406 if (node->tn_status & TMPFS_NODE_ACCESSED) { 1407 if (acc == NULL) 1408 acc = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1409 node->tn_atime = *acc; 1410 } 1411 if (node->tn_status & TMPFS_NODE_MODIFIED) { 1412 if (mod == NULL) 1413 mod = ts == NULL ? (ts = nanotime(&tsb)) : ts; 1414 node->tn_mtime = *mod; 1415 } 1416 if (node->tn_status & TMPFS_NODE_CHANGED) { 1417 if (ts == NULL) 1418 ts = nanotime(&tsb); 1419 node->tn_ctime = *ts; 1420 } 1421 node->tn_status &= 1422 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 1423 TMPFS_NODE_CHANGED); 1424 } 1425 1426 KASSERT(VOP_ISLOCKED(vp)); 1427 1428 return 0; 1429} 1430 1431/* --------------------------------------------------------------------- */ 1432 1433int 1434tmpfs_getpages(void *v) 1435{ 1436 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1437 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1438 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1439 int *count = ((struct vop_getpages_args *)v)->a_count; 1440 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1441 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1442 int advice = ((struct vop_getpages_args *)v)->a_advice; 1443 int flags = ((struct vop_getpages_args *)v)->a_flags; 1444 1445 int error; 1446 struct tmpfs_node *node; 1447 struct uvm_object *uobj; 1448 int npages = *count; 1449 1450 KASSERT(vp->v_type == VREG); 1451 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1452 1453 node = VP_TO_TMPFS_NODE(vp); 1454 uobj = node->tn_aobj; 1455 1456 /* We currently don't rely on PGO_PASTEOF. */ 1457 1458 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1459 if ((flags & PGO_LOCKED) == 0) 1460 simple_unlock(&vp->v_interlock); 1461 return EINVAL; 1462 } 1463 1464 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1465 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1466 } 1467 1468 if ((flags & PGO_LOCKED) != 0) 1469 return EBUSY; 1470 1471 if ((flags & PGO_NOTIMESTAMP) == 0) { 1472 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1473 node->tn_status |= TMPFS_NODE_ACCESSED; 1474 1475 if ((access_type & VM_PROT_WRITE) != 0) 1476 node->tn_status |= TMPFS_NODE_MODIFIED; 1477 } 1478 1479 simple_unlock(&vp->v_interlock); 1480 1481 simple_lock(&uobj->vmobjlock); 1482 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1483 access_type, advice, flags); 1484 1485 return error; 1486} 1487 1488/* --------------------------------------------------------------------- */ 1489 1490int 1491tmpfs_putpages(void *v) 1492{ 1493 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1494 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1495 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1496 int flags = ((struct vop_putpages_args *)v)->a_flags; 1497 1498 int error; 1499 struct tmpfs_node *node; 1500 struct uvm_object *uobj; 1501 1502 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1503 1504 node = VP_TO_TMPFS_NODE(vp); 1505 1506 if (vp->v_type != VREG) { 1507 simple_unlock(&vp->v_interlock); 1508 return 0; 1509 } 1510 1511 uobj = node->tn_aobj; 1512 simple_unlock(&vp->v_interlock); 1513 1514 simple_lock(&uobj->vmobjlock); 1515 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1516 1517 /* XXX mtime */ 1518 1519 return error; 1520} 1521