tmpfs_vnops.c revision 207662
1/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv 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 * 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#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vnops.c 207662 2010-05-05 16:44:25Z trasz $"); 38 39#include <sys/param.h> 40#include <sys/fcntl.h> 41#include <sys/lockf.h> 42#include <sys/namei.h> 43#include <sys/priv.h> 44#include <sys/proc.h> 45#include <sys/sched.h> 46#include <sys/sf_buf.h> 47#include <sys/stat.h> 48#include <sys/systm.h> 49#include <sys/unistd.h> 50#include <sys/vnode.h> 51 52#include <vm/vm.h> 53#include <vm/vm_object.h> 54#include <vm/vm_page.h> 55#include <vm/vm_pager.h> 56 57#include <machine/_inttypes.h> 58 59#include <fs/fifofs/fifo.h> 60#include <fs/tmpfs/tmpfs_vnops.h> 61#include <fs/tmpfs/tmpfs.h> 62 63/* --------------------------------------------------------------------- */ 64 65static int 66tmpfs_lookup(struct vop_cachedlookup_args *v) 67{ 68 struct vnode *dvp = v->a_dvp; 69 struct vnode **vpp = v->a_vpp; 70 struct componentname *cnp = v->a_cnp; 71 72 int error; 73 struct tmpfs_dirent *de; 74 struct tmpfs_node *dnode; 75 76 dnode = VP_TO_TMPFS_DIR(dvp); 77 *vpp = NULLVP; 78 79 /* Check accessibility of requested node as a first step. */ 80 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 81 if (error != 0) 82 goto out; 83 84 /* We cannot be requesting the parent directory of the root node. */ 85 MPASS(IMPLIES(dnode->tn_type == VDIR && 86 dnode->tn_dir.tn_parent == dnode, 87 !(cnp->cn_flags & ISDOTDOT))); 88 89 TMPFS_ASSERT_LOCKED(dnode); 90 if (dnode->tn_dir.tn_parent == NULL) { 91 error = ENOENT; 92 goto out; 93 } 94 if (cnp->cn_flags & ISDOTDOT) { 95 int ltype = 0; 96 97 ltype = VOP_ISLOCKED(dvp); 98 vhold(dvp); 99 VOP_UNLOCK(dvp, 0); 100 /* Allocate a new vnode on the matching entry. */ 101 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 102 cnp->cn_lkflags, vpp); 103 104 vn_lock(dvp, ltype | LK_RETRY); 105 vdrop(dvp); 106 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 107 VREF(dvp); 108 *vpp = dvp; 109 error = 0; 110 } else { 111 de = tmpfs_dir_lookup(dnode, NULL, cnp); 112 if (de == NULL) { 113 /* The entry was not found in the directory. 114 * This is OK if we are creating or renaming an 115 * entry and are working on the last component of 116 * the path name. */ 117 if ((cnp->cn_flags & ISLASTCN) && 118 (cnp->cn_nameiop == CREATE || \ 119 cnp->cn_nameiop == RENAME)) { 120 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 121 cnp->cn_thread); 122 if (error != 0) 123 goto out; 124 125 /* Keep the component name in the buffer for 126 * future uses. */ 127 cnp->cn_flags |= SAVENAME; 128 129 error = EJUSTRETURN; 130 } else 131 error = ENOENT; 132 } else { 133 struct tmpfs_node *tnode; 134 135 /* The entry was found, so get its associated 136 * tmpfs_node. */ 137 tnode = de->td_node; 138 139 /* If we are not at the last path component and 140 * found a non-directory or non-link entry (which 141 * may itself be pointing to a directory), raise 142 * an error. */ 143 if ((tnode->tn_type != VDIR && 144 tnode->tn_type != VLNK) && 145 !(cnp->cn_flags & ISLASTCN)) { 146 error = ENOTDIR; 147 goto out; 148 } 149 150 /* If we are deleting or renaming the entry, keep 151 * track of its tmpfs_dirent so that it can be 152 * easily deleted later. */ 153 if ((cnp->cn_flags & ISLASTCN) && 154 (cnp->cn_nameiop == DELETE || 155 cnp->cn_nameiop == RENAME)) { 156 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 157 cnp->cn_thread); 158 if (error != 0) 159 goto out; 160 161 /* Allocate a new vnode on the matching entry. */ 162 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 163 cnp->cn_lkflags, vpp); 164 if (error != 0) 165 goto out; 166 167 if ((dnode->tn_mode & S_ISTXT) && 168 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 169 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 170 error = EPERM; 171 vput(*vpp); 172 *vpp = NULL; 173 goto out; 174 } 175 cnp->cn_flags |= SAVENAME; 176 } else { 177 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 178 cnp->cn_lkflags, vpp); 179 } 180 } 181 } 182 183 /* Store the result of this lookup in the cache. Avoid this if the 184 * request was for creation, as it does not improve timings on 185 * emprical tests. */ 186 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 187 cache_enter(dvp, *vpp, cnp); 188 189out: 190 /* If there were no errors, *vpp cannot be null and it must be 191 * locked. */ 192 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 193 194 return error; 195} 196 197/* --------------------------------------------------------------------- */ 198 199static int 200tmpfs_create(struct vop_create_args *v) 201{ 202 struct vnode *dvp = v->a_dvp; 203 struct vnode **vpp = v->a_vpp; 204 struct componentname *cnp = v->a_cnp; 205 struct vattr *vap = v->a_vap; 206 207 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 208 209 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 210} 211/* --------------------------------------------------------------------- */ 212 213static int 214tmpfs_mknod(struct vop_mknod_args *v) 215{ 216 struct vnode *dvp = v->a_dvp; 217 struct vnode **vpp = v->a_vpp; 218 struct componentname *cnp = v->a_cnp; 219 struct vattr *vap = v->a_vap; 220 221 if (vap->va_type != VBLK && vap->va_type != VCHR && 222 vap->va_type != VFIFO) 223 return EINVAL; 224 225 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 226} 227 228/* --------------------------------------------------------------------- */ 229 230static int 231tmpfs_open(struct vop_open_args *v) 232{ 233 struct vnode *vp = v->a_vp; 234 int mode = v->a_mode; 235 236 int error; 237 struct tmpfs_node *node; 238 239 MPASS(VOP_ISLOCKED(vp)); 240 241 node = VP_TO_TMPFS_NODE(vp); 242 243 /* The file is still active but all its names have been removed 244 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 245 * it is about to die. */ 246 if (node->tn_links < 1) 247 return (ENOENT); 248 249 /* If the file is marked append-only, deny write requests. */ 250 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 251 error = EPERM; 252 else { 253 error = 0; 254 vnode_create_vobject(vp, node->tn_size, v->a_td); 255 } 256 257 MPASS(VOP_ISLOCKED(vp)); 258 return error; 259} 260 261/* --------------------------------------------------------------------- */ 262 263static int 264tmpfs_close(struct vop_close_args *v) 265{ 266 struct vnode *vp = v->a_vp; 267 268 struct tmpfs_node *node; 269 270 MPASS(VOP_ISLOCKED(vp)); 271 272 node = VP_TO_TMPFS_NODE(vp); 273 274 if (node->tn_links > 0) { 275 /* Update node times. No need to do it if the node has 276 * been deleted, because it will vanish after we return. */ 277 tmpfs_update(vp); 278 } 279 280 return 0; 281} 282 283/* --------------------------------------------------------------------- */ 284 285int 286tmpfs_access(struct vop_access_args *v) 287{ 288 struct vnode *vp = v->a_vp; 289 accmode_t accmode = v->a_accmode; 290 struct ucred *cred = v->a_cred; 291 292 int error; 293 struct tmpfs_node *node; 294 295 MPASS(VOP_ISLOCKED(vp)); 296 297 node = VP_TO_TMPFS_NODE(vp); 298 299 switch (vp->v_type) { 300 case VDIR: 301 /* FALLTHROUGH */ 302 case VLNK: 303 /* FALLTHROUGH */ 304 case VREG: 305 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 306 error = EROFS; 307 goto out; 308 } 309 break; 310 311 case VBLK: 312 /* FALLTHROUGH */ 313 case VCHR: 314 /* FALLTHROUGH */ 315 case VSOCK: 316 /* FALLTHROUGH */ 317 case VFIFO: 318 break; 319 320 default: 321 error = EINVAL; 322 goto out; 323 } 324 325 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 326 error = EPERM; 327 goto out; 328 } 329 330 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 331 node->tn_gid, accmode, cred, NULL); 332 333out: 334 MPASS(VOP_ISLOCKED(vp)); 335 336 return error; 337} 338 339/* --------------------------------------------------------------------- */ 340 341int 342tmpfs_getattr(struct vop_getattr_args *v) 343{ 344 struct vnode *vp = v->a_vp; 345 struct vattr *vap = v->a_vap; 346 347 struct tmpfs_node *node; 348 349 node = VP_TO_TMPFS_NODE(vp); 350 351 tmpfs_update(vp); 352 353 vap->va_type = vp->v_type; 354 vap->va_mode = node->tn_mode; 355 vap->va_nlink = node->tn_links; 356 vap->va_uid = node->tn_uid; 357 vap->va_gid = node->tn_gid; 358 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 359 vap->va_fileid = node->tn_id; 360 vap->va_size = node->tn_size; 361 vap->va_blocksize = PAGE_SIZE; 362 vap->va_atime = node->tn_atime; 363 vap->va_mtime = node->tn_mtime; 364 vap->va_ctime = node->tn_ctime; 365 vap->va_birthtime = node->tn_birthtime; 366 vap->va_gen = node->tn_gen; 367 vap->va_flags = node->tn_flags; 368 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 369 node->tn_rdev : NODEV; 370 vap->va_bytes = round_page(node->tn_size); 371 vap->va_filerev = 0; 372 373 return 0; 374} 375 376/* --------------------------------------------------------------------- */ 377 378/* XXX Should this operation be atomic? I think it should, but code in 379 * XXX other places (e.g., ufs) doesn't seem to be... */ 380int 381tmpfs_setattr(struct vop_setattr_args *v) 382{ 383 struct vnode *vp = v->a_vp; 384 struct vattr *vap = v->a_vap; 385 struct ucred *cred = v->a_cred; 386 struct thread *td = curthread; 387 388 int error; 389 390 MPASS(VOP_ISLOCKED(vp)); 391 392 error = 0; 393 394 /* Abort if any unsettable attribute is given. */ 395 if (vap->va_type != VNON || 396 vap->va_nlink != VNOVAL || 397 vap->va_fsid != VNOVAL || 398 vap->va_fileid != VNOVAL || 399 vap->va_blocksize != VNOVAL || 400 vap->va_gen != VNOVAL || 401 vap->va_rdev != VNOVAL || 402 vap->va_bytes != VNOVAL) 403 error = EINVAL; 404 405 if (error == 0 && (vap->va_flags != VNOVAL)) 406 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 407 408 if (error == 0 && (vap->va_size != VNOVAL)) 409 error = tmpfs_chsize(vp, vap->va_size, cred, td); 410 411 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 412 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 413 414 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 415 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 416 417 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 418 vap->va_atime.tv_nsec != VNOVAL) || 419 (vap->va_mtime.tv_sec != VNOVAL && 420 vap->va_mtime.tv_nsec != VNOVAL) || 421 (vap->va_birthtime.tv_sec != VNOVAL && 422 vap->va_birthtime.tv_nsec != VNOVAL))) 423 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 424 &vap->va_birthtime, vap->va_vaflags, cred, td); 425 426 /* Update the node times. We give preference to the error codes 427 * generated by this function rather than the ones that may arise 428 * from tmpfs_update. */ 429 tmpfs_update(vp); 430 431 MPASS(VOP_ISLOCKED(vp)); 432 433 return error; 434} 435 436/* --------------------------------------------------------------------- */ 437static int 438tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 439 vm_offset_t offset, size_t tlen, struct uio *uio) 440{ 441 vm_page_t m; 442 int error; 443 444 VM_OBJECT_LOCK(tobj); 445 vm_object_pip_add(tobj, 1); 446 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 447 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 448 if (m->valid != VM_PAGE_BITS_ALL) { 449 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 450 error = vm_pager_get_pages(tobj, &m, 1, 0); 451 if (error != 0) { 452 printf("tmpfs get pages from pager error [read]\n"); 453 goto out; 454 } 455 } else 456 vm_page_zero_invalid(m, TRUE); 457 } 458 VM_OBJECT_UNLOCK(tobj); 459 error = uiomove_fromphys(&m, offset, tlen, uio); 460 VM_OBJECT_LOCK(tobj); 461out: 462 vm_page_lock(m); 463 vm_page_unwire(m, TRUE); 464 vm_page_unlock(m); 465 vm_page_wakeup(m); 466 vm_object_pip_subtract(tobj, 1); 467 VM_OBJECT_UNLOCK(tobj); 468 469 return (error); 470} 471 472static __inline int 473tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 474 vm_offset_t offset, size_t tlen, void *buf) 475{ 476 struct uio uio; 477 struct iovec iov; 478 479 uio.uio_iovcnt = 1; 480 uio.uio_iov = &iov; 481 iov.iov_base = buf; 482 iov.iov_len = tlen; 483 484 uio.uio_offset = 0; 485 uio.uio_resid = tlen; 486 uio.uio_rw = UIO_READ; 487 uio.uio_segflg = UIO_SYSSPACE; 488 uio.uio_td = curthread; 489 490 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 491} 492 493static int 494tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 495{ 496 struct sf_buf *sf; 497 vm_pindex_t idx; 498 vm_page_t m; 499 vm_offset_t offset; 500 off_t addr; 501 size_t tlen; 502 char *ma; 503 int error; 504 505 addr = uio->uio_offset; 506 idx = OFF_TO_IDX(addr); 507 offset = addr & PAGE_MASK; 508 tlen = MIN(PAGE_SIZE - offset, len); 509 510 if ((vobj == NULL) || 511 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 512 goto nocache; 513 514 VM_OBJECT_LOCK(vobj); 515lookupvpg: 516 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 517 vm_page_is_valid(m, offset, tlen)) { 518 if ((m->oflags & VPO_BUSY) != 0) { 519 /* 520 * Reference the page before unlocking and sleeping so 521 * that the page daemon is less likely to reclaim it. 522 */ 523 vm_page_lock_queues(); 524 vm_page_flag_set(m, PG_REFERENCED); 525 vm_page_sleep(m, "tmfsmr"); 526 goto lookupvpg; 527 } 528 vm_page_busy(m); 529 VM_OBJECT_UNLOCK(vobj); 530 error = uiomove_fromphys(&m, offset, tlen, uio); 531 VM_OBJECT_LOCK(vobj); 532 vm_page_wakeup(m); 533 VM_OBJECT_UNLOCK(vobj); 534 return (error); 535 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 536 if ((m->oflags & VPO_BUSY) != 0) { 537 /* 538 * Reference the page before unlocking and sleeping so 539 * that the page daemon is less likely to reclaim it. 540 */ 541 vm_page_lock_queues(); 542 vm_page_flag_set(m, PG_REFERENCED); 543 vm_page_sleep(m, "tmfsmr"); 544 goto lookupvpg; 545 } 546 vm_page_busy(m); 547 VM_OBJECT_UNLOCK(vobj); 548 sched_pin(); 549 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 550 ma = (char *)sf_buf_kva(sf); 551 error = tmpfs_nocacheread_buf(tobj, idx, offset, tlen, 552 ma + offset); 553 if (error == 0) { 554 uio->uio_offset += tlen; 555 uio->uio_resid -= tlen; 556 } 557 sf_buf_free(sf); 558 sched_unpin(); 559 VM_OBJECT_LOCK(vobj); 560 vm_page_wakeup(m); 561 VM_OBJECT_UNLOCK(vobj); 562 return (error); 563 } 564 VM_OBJECT_UNLOCK(vobj); 565nocache: 566 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 567 568 return (error); 569} 570 571static int 572tmpfs_read(struct vop_read_args *v) 573{ 574 struct vnode *vp = v->a_vp; 575 struct uio *uio = v->a_uio; 576 577 struct tmpfs_node *node; 578 vm_object_t uobj; 579 size_t len; 580 int resid; 581 582 int error = 0; 583 584 node = VP_TO_TMPFS_NODE(vp); 585 586 if (vp->v_type != VREG) { 587 error = EISDIR; 588 goto out; 589 } 590 591 if (uio->uio_offset < 0) { 592 error = EINVAL; 593 goto out; 594 } 595 596 node->tn_status |= TMPFS_NODE_ACCESSED; 597 598 uobj = node->tn_reg.tn_aobj; 599 while ((resid = uio->uio_resid) > 0) { 600 error = 0; 601 if (node->tn_size <= uio->uio_offset) 602 break; 603 len = MIN(node->tn_size - uio->uio_offset, resid); 604 if (len == 0) 605 break; 606 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 607 if ((error != 0) || (resid == uio->uio_resid)) 608 break; 609 } 610 611out: 612 613 return error; 614} 615 616/* --------------------------------------------------------------------- */ 617 618static int 619tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 620{ 621 vm_pindex_t idx; 622 vm_page_t vpg, tpg; 623 vm_offset_t offset; 624 off_t addr; 625 size_t tlen; 626 int error; 627 628 error = 0; 629 630 addr = uio->uio_offset; 631 idx = OFF_TO_IDX(addr); 632 offset = addr & PAGE_MASK; 633 tlen = MIN(PAGE_SIZE - offset, len); 634 635 if ((vobj == NULL) || 636 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 637 vpg = NULL; 638 goto nocache; 639 } 640 641 VM_OBJECT_LOCK(vobj); 642lookupvpg: 643 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 644 vm_page_is_valid(vpg, offset, tlen)) { 645 if ((vpg->oflags & VPO_BUSY) != 0) { 646 /* 647 * Reference the page before unlocking and sleeping so 648 * that the page daemon is less likely to reclaim it. 649 */ 650 vm_page_lock_queues(); 651 vm_page_flag_set(vpg, PG_REFERENCED); 652 vm_page_sleep(vpg, "tmfsmw"); 653 goto lookupvpg; 654 } 655 vm_page_busy(vpg); 656 vm_page_lock_queues(); 657 vm_page_undirty(vpg); 658 vm_page_unlock_queues(); 659 VM_OBJECT_UNLOCK(vobj); 660 error = uiomove_fromphys(&vpg, offset, tlen, uio); 661 } else { 662 if (__predict_false(vobj->cache != NULL)) 663 vm_page_cache_free(vobj, idx, idx + 1); 664 VM_OBJECT_UNLOCK(vobj); 665 vpg = NULL; 666 } 667nocache: 668 VM_OBJECT_LOCK(tobj); 669 vm_object_pip_add(tobj, 1); 670 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 671 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 672 if (tpg->valid != VM_PAGE_BITS_ALL) { 673 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 674 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 675 if (error != 0) { 676 printf("tmpfs get pages from pager error [write]\n"); 677 goto out; 678 } 679 } else 680 vm_page_zero_invalid(tpg, TRUE); 681 } 682 VM_OBJECT_UNLOCK(tobj); 683 if (vpg == NULL) 684 error = uiomove_fromphys(&tpg, offset, tlen, uio); 685 else { 686 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 687 pmap_copy_page(vpg, tpg); 688 } 689 VM_OBJECT_LOCK(tobj); 690out: 691 if (vobj != NULL) 692 VM_OBJECT_LOCK(vobj); 693 vm_page_lock(tpg); 694 vm_page_lock_queues(); 695 if (error == 0) { 696 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 697 ("parts of tpg invalid")); 698 vm_page_dirty(tpg); 699 } 700 vm_page_unwire(tpg, TRUE); 701 vm_page_unlock_queues(); 702 vm_page_unlock(tpg); 703 vm_page_wakeup(tpg); 704 if (vpg != NULL) 705 vm_page_wakeup(vpg); 706 if (vobj != NULL) 707 VM_OBJECT_UNLOCK(vobj); 708 vm_object_pip_subtract(tobj, 1); 709 VM_OBJECT_UNLOCK(tobj); 710 711 return (error); 712} 713 714static int 715tmpfs_write(struct vop_write_args *v) 716{ 717 struct vnode *vp = v->a_vp; 718 struct uio *uio = v->a_uio; 719 int ioflag = v->a_ioflag; 720 struct thread *td = uio->uio_td; 721 722 boolean_t extended; 723 int error = 0; 724 off_t oldsize; 725 struct tmpfs_node *node; 726 vm_object_t uobj; 727 size_t len; 728 int resid; 729 730 node = VP_TO_TMPFS_NODE(vp); 731 oldsize = node->tn_size; 732 733 if (uio->uio_offset < 0 || vp->v_type != VREG) { 734 error = EINVAL; 735 goto out; 736 } 737 738 if (uio->uio_resid == 0) { 739 error = 0; 740 goto out; 741 } 742 743 if (ioflag & IO_APPEND) 744 uio->uio_offset = node->tn_size; 745 746 if (uio->uio_offset + uio->uio_resid > 747 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 748 return (EFBIG); 749 750 if (vn_rlimit_fsize(vp, uio, td)) 751 return (EFBIG); 752 753 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 754 if (extended) { 755 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 756 if (error != 0) 757 goto out; 758 } 759 760 uobj = node->tn_reg.tn_aobj; 761 while ((resid = uio->uio_resid) > 0) { 762 if (node->tn_size <= uio->uio_offset) 763 break; 764 len = MIN(node->tn_size - uio->uio_offset, resid); 765 if (len == 0) 766 break; 767 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 768 if ((error != 0) || (resid == uio->uio_resid)) 769 break; 770 } 771 772 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 773 (extended ? TMPFS_NODE_CHANGED : 0); 774 775 if (node->tn_mode & (S_ISUID | S_ISGID)) { 776 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 777 node->tn_mode &= ~(S_ISUID | S_ISGID); 778 } 779 780 if (error != 0) 781 (void)tmpfs_reg_resize(vp, oldsize); 782 783out: 784 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 785 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 786 787 return error; 788} 789 790/* --------------------------------------------------------------------- */ 791 792static int 793tmpfs_fsync(struct vop_fsync_args *v) 794{ 795 struct vnode *vp = v->a_vp; 796 797 MPASS(VOP_ISLOCKED(vp)); 798 799 tmpfs_update(vp); 800 801 return 0; 802} 803 804/* --------------------------------------------------------------------- */ 805 806static int 807tmpfs_remove(struct vop_remove_args *v) 808{ 809 struct vnode *dvp = v->a_dvp; 810 struct vnode *vp = v->a_vp; 811 812 int error; 813 struct tmpfs_dirent *de; 814 struct tmpfs_mount *tmp; 815 struct tmpfs_node *dnode; 816 struct tmpfs_node *node; 817 818 MPASS(VOP_ISLOCKED(dvp)); 819 MPASS(VOP_ISLOCKED(vp)); 820 821 if (vp->v_type == VDIR) { 822 error = EISDIR; 823 goto out; 824 } 825 826 dnode = VP_TO_TMPFS_DIR(dvp); 827 node = VP_TO_TMPFS_NODE(vp); 828 tmp = VFS_TO_TMPFS(vp->v_mount); 829 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 830 MPASS(de != NULL); 831 832 /* Files marked as immutable or append-only cannot be deleted. */ 833 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 834 (dnode->tn_flags & APPEND)) { 835 error = EPERM; 836 goto out; 837 } 838 839 /* Remove the entry from the directory; as it is a file, we do not 840 * have to change the number of hard links of the directory. */ 841 tmpfs_dir_detach(dvp, de); 842 843 /* Free the directory entry we just deleted. Note that the node 844 * referred by it will not be removed until the vnode is really 845 * reclaimed. */ 846 tmpfs_free_dirent(tmp, de, TRUE); 847 848 if (node->tn_links > 0) 849 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 850 TMPFS_NODE_MODIFIED; 851 error = 0; 852 853out: 854 855 return error; 856} 857 858/* --------------------------------------------------------------------- */ 859 860static int 861tmpfs_link(struct vop_link_args *v) 862{ 863 struct vnode *dvp = v->a_tdvp; 864 struct vnode *vp = v->a_vp; 865 struct componentname *cnp = v->a_cnp; 866 867 int error; 868 struct tmpfs_dirent *de; 869 struct tmpfs_node *node; 870 871 MPASS(VOP_ISLOCKED(dvp)); 872 MPASS(cnp->cn_flags & HASBUF); 873 MPASS(dvp != vp); /* XXX When can this be false? */ 874 875 node = VP_TO_TMPFS_NODE(vp); 876 877 /* XXX: Why aren't the following two tests done by the caller? */ 878 879 /* Hard links of directories are forbidden. */ 880 if (vp->v_type == VDIR) { 881 error = EPERM; 882 goto out; 883 } 884 885 /* Cannot create cross-device links. */ 886 if (dvp->v_mount != vp->v_mount) { 887 error = EXDEV; 888 goto out; 889 } 890 891 /* Ensure that we do not overflow the maximum number of links imposed 892 * by the system. */ 893 MPASS(node->tn_links <= LINK_MAX); 894 if (node->tn_links == LINK_MAX) { 895 error = EMLINK; 896 goto out; 897 } 898 899 /* We cannot create links of files marked immutable or append-only. */ 900 if (node->tn_flags & (IMMUTABLE | APPEND)) { 901 error = EPERM; 902 goto out; 903 } 904 905 /* Allocate a new directory entry to represent the node. */ 906 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 907 cnp->cn_nameptr, cnp->cn_namelen, &de); 908 if (error != 0) 909 goto out; 910 911 /* Insert the new directory entry into the appropriate directory. */ 912 tmpfs_dir_attach(dvp, de); 913 914 /* vp link count has changed, so update node times. */ 915 node->tn_status |= TMPFS_NODE_CHANGED; 916 tmpfs_update(vp); 917 918 error = 0; 919 920out: 921 return error; 922} 923 924/* --------------------------------------------------------------------- */ 925 926static int 927tmpfs_rename(struct vop_rename_args *v) 928{ 929 struct vnode *fdvp = v->a_fdvp; 930 struct vnode *fvp = v->a_fvp; 931 struct componentname *fcnp = v->a_fcnp; 932 struct vnode *tdvp = v->a_tdvp; 933 struct vnode *tvp = v->a_tvp; 934 struct componentname *tcnp = v->a_tcnp; 935 936 char *newname; 937 int error; 938 struct tmpfs_dirent *de; 939 struct tmpfs_mount *tmp; 940 struct tmpfs_node *fdnode; 941 struct tmpfs_node *fnode; 942 struct tmpfs_node *tnode; 943 struct tmpfs_node *tdnode; 944 945 MPASS(VOP_ISLOCKED(tdvp)); 946 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 947 MPASS(fcnp->cn_flags & HASBUF); 948 MPASS(tcnp->cn_flags & HASBUF); 949 950 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 951 952 /* Disallow cross-device renames. 953 * XXX Why isn't this done by the caller? */ 954 if (fvp->v_mount != tdvp->v_mount || 955 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 956 error = EXDEV; 957 goto out; 958 } 959 960 tmp = VFS_TO_TMPFS(tdvp->v_mount); 961 tdnode = VP_TO_TMPFS_DIR(tdvp); 962 963 /* If source and target are the same file, there is nothing to do. */ 964 if (fvp == tvp) { 965 error = 0; 966 goto out; 967 } 968 969 /* If we need to move the directory between entries, lock the 970 * source so that we can safely operate on it. */ 971 if (tdvp != fdvp) { 972 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 973 if (error != 0) 974 goto out; 975 } 976 fdnode = VP_TO_TMPFS_DIR(fdvp); 977 fnode = VP_TO_TMPFS_NODE(fvp); 978 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 979 980 /* Avoid manipulating '.' and '..' entries. */ 981 if (de == NULL) { 982 MPASS(fvp->v_type == VDIR); 983 error = EINVAL; 984 goto out_locked; 985 } 986 MPASS(de->td_node == fnode); 987 988 /* If re-naming a directory to another preexisting directory 989 * ensure that the target directory is empty so that its 990 * removal causes no side effects. 991 * Kern_rename gurantees the destination to be a directory 992 * if the source is one. */ 993 if (tvp != NULL) { 994 MPASS(tnode != NULL); 995 996 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 997 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 998 error = EPERM; 999 goto out_locked; 1000 } 1001 1002 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1003 if (tnode->tn_size > 0) { 1004 error = ENOTEMPTY; 1005 goto out_locked; 1006 } 1007 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1008 error = ENOTDIR; 1009 goto out_locked; 1010 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1011 error = EISDIR; 1012 goto out_locked; 1013 } else { 1014 MPASS(fnode->tn_type != VDIR && 1015 tnode->tn_type != VDIR); 1016 } 1017 } 1018 1019 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1020 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1021 error = EPERM; 1022 goto out_locked; 1023 } 1024 1025 /* Ensure that we have enough memory to hold the new name, if it 1026 * has to be changed. */ 1027 if (fcnp->cn_namelen != tcnp->cn_namelen || 1028 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1029 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1030 } else 1031 newname = NULL; 1032 1033 /* If the node is being moved to another directory, we have to do 1034 * the move. */ 1035 if (fdnode != tdnode) { 1036 /* In case we are moving a directory, we have to adjust its 1037 * parent to point to the new parent. */ 1038 if (de->td_node->tn_type == VDIR) { 1039 struct tmpfs_node *n; 1040 1041 /* Ensure the target directory is not a child of the 1042 * directory being moved. Otherwise, we'd end up 1043 * with stale nodes. */ 1044 n = tdnode; 1045 /* TMPFS_LOCK garanties that no nodes are freed while 1046 * traversing the list. Nodes can only be marked as 1047 * removed: tn_parent == NULL. */ 1048 TMPFS_LOCK(tmp); 1049 TMPFS_NODE_LOCK(n); 1050 while (n != n->tn_dir.tn_parent) { 1051 struct tmpfs_node *parent; 1052 1053 if (n == fnode) { 1054 TMPFS_NODE_UNLOCK(n); 1055 TMPFS_UNLOCK(tmp); 1056 error = EINVAL; 1057 if (newname != NULL) 1058 free(newname, M_TMPFSNAME); 1059 goto out_locked; 1060 } 1061 parent = n->tn_dir.tn_parent; 1062 TMPFS_NODE_UNLOCK(n); 1063 if (parent == NULL) { 1064 n = NULL; 1065 break; 1066 } 1067 TMPFS_NODE_LOCK(parent); 1068 if (parent->tn_dir.tn_parent == NULL) { 1069 TMPFS_NODE_UNLOCK(parent); 1070 n = NULL; 1071 break; 1072 } 1073 n = parent; 1074 } 1075 TMPFS_UNLOCK(tmp); 1076 if (n == NULL) { 1077 error = EINVAL; 1078 if (newname != NULL) 1079 free(newname, M_TMPFSNAME); 1080 goto out_locked; 1081 } 1082 TMPFS_NODE_UNLOCK(n); 1083 1084 /* Adjust the parent pointer. */ 1085 TMPFS_VALIDATE_DIR(fnode); 1086 TMPFS_NODE_LOCK(de->td_node); 1087 de->td_node->tn_dir.tn_parent = tdnode; 1088 TMPFS_NODE_UNLOCK(de->td_node); 1089 1090 /* As a result of changing the target of the '..' 1091 * entry, the link count of the source and target 1092 * directories has to be adjusted. */ 1093 TMPFS_NODE_LOCK(tdnode); 1094 TMPFS_ASSERT_LOCKED(tdnode); 1095 tdnode->tn_links++; 1096 TMPFS_NODE_UNLOCK(tdnode); 1097 1098 TMPFS_NODE_LOCK(fdnode); 1099 TMPFS_ASSERT_LOCKED(fdnode); 1100 fdnode->tn_links--; 1101 TMPFS_NODE_UNLOCK(fdnode); 1102 } 1103 1104 /* Do the move: just remove the entry from the source directory 1105 * and insert it into the target one. */ 1106 tmpfs_dir_detach(fdvp, de); 1107 tmpfs_dir_attach(tdvp, de); 1108 } 1109 1110 /* If the name has changed, we need to make it effective by changing 1111 * it in the directory entry. */ 1112 if (newname != NULL) { 1113 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1114 1115 free(de->td_name, M_TMPFSNAME); 1116 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1117 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1118 de->td_name = newname; 1119 1120 fnode->tn_status |= TMPFS_NODE_CHANGED; 1121 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1122 } 1123 1124 /* If we are overwriting an entry, we have to remove the old one 1125 * from the target directory. */ 1126 if (tvp != NULL) { 1127 /* Remove the old entry from the target directory. */ 1128 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1129 tmpfs_dir_detach(tdvp, de); 1130 1131 /* Free the directory entry we just deleted. Note that the 1132 * node referred by it will not be removed until the vnode is 1133 * really reclaimed. */ 1134 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1135 } 1136 1137 error = 0; 1138 1139out_locked: 1140 if (fdnode != tdnode) 1141 VOP_UNLOCK(fdvp, 0); 1142 1143out: 1144 /* Release target nodes. */ 1145 /* XXX: I don't understand when tdvp can be the same as tvp, but 1146 * other code takes care of this... */ 1147 if (tdvp == tvp) 1148 vrele(tdvp); 1149 else 1150 vput(tdvp); 1151 if (tvp != NULL) 1152 vput(tvp); 1153 1154 /* Release source nodes. */ 1155 vrele(fdvp); 1156 vrele(fvp); 1157 1158 return error; 1159} 1160 1161/* --------------------------------------------------------------------- */ 1162 1163static int 1164tmpfs_mkdir(struct vop_mkdir_args *v) 1165{ 1166 struct vnode *dvp = v->a_dvp; 1167 struct vnode **vpp = v->a_vpp; 1168 struct componentname *cnp = v->a_cnp; 1169 struct vattr *vap = v->a_vap; 1170 1171 MPASS(vap->va_type == VDIR); 1172 1173 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1174} 1175 1176/* --------------------------------------------------------------------- */ 1177 1178static int 1179tmpfs_rmdir(struct vop_rmdir_args *v) 1180{ 1181 struct vnode *dvp = v->a_dvp; 1182 struct vnode *vp = v->a_vp; 1183 1184 int error; 1185 struct tmpfs_dirent *de; 1186 struct tmpfs_mount *tmp; 1187 struct tmpfs_node *dnode; 1188 struct tmpfs_node *node; 1189 1190 MPASS(VOP_ISLOCKED(dvp)); 1191 MPASS(VOP_ISLOCKED(vp)); 1192 1193 tmp = VFS_TO_TMPFS(dvp->v_mount); 1194 dnode = VP_TO_TMPFS_DIR(dvp); 1195 node = VP_TO_TMPFS_DIR(vp); 1196 1197 /* Directories with more than two entries ('.' and '..') cannot be 1198 * removed. */ 1199 if (node->tn_size > 0) { 1200 error = ENOTEMPTY; 1201 goto out; 1202 } 1203 1204 if ((dnode->tn_flags & APPEND) 1205 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1206 error = EPERM; 1207 goto out; 1208 } 1209 1210 /* This invariant holds only if we are not trying to remove "..". 1211 * We checked for that above so this is safe now. */ 1212 MPASS(node->tn_dir.tn_parent == dnode); 1213 1214 /* Get the directory entry associated with node (vp). This was 1215 * filled by tmpfs_lookup while looking up the entry. */ 1216 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1217 MPASS(TMPFS_DIRENT_MATCHES(de, 1218 v->a_cnp->cn_nameptr, 1219 v->a_cnp->cn_namelen)); 1220 1221 /* Check flags to see if we are allowed to remove the directory. */ 1222 if (dnode->tn_flags & APPEND 1223 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1224 error = EPERM; 1225 goto out; 1226 } 1227 1228 1229 /* Detach the directory entry from the directory (dnode). */ 1230 tmpfs_dir_detach(dvp, de); 1231 1232 /* No vnode should be allocated for this entry from this point */ 1233 TMPFS_NODE_LOCK(node); 1234 TMPFS_ASSERT_ELOCKED(node); 1235 node->tn_links--; 1236 node->tn_dir.tn_parent = NULL; 1237 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1238 TMPFS_NODE_MODIFIED; 1239 1240 TMPFS_NODE_UNLOCK(node); 1241 1242 TMPFS_NODE_LOCK(dnode); 1243 TMPFS_ASSERT_ELOCKED(dnode); 1244 dnode->tn_links--; 1245 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1246 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1247 TMPFS_NODE_UNLOCK(dnode); 1248 1249 cache_purge(dvp); 1250 cache_purge(vp); 1251 1252 /* Free the directory entry we just deleted. Note that the node 1253 * referred by it will not be removed until the vnode is really 1254 * reclaimed. */ 1255 tmpfs_free_dirent(tmp, de, TRUE); 1256 1257 /* Release the deleted vnode (will destroy the node, notify 1258 * interested parties and clean it from the cache). */ 1259 1260 dnode->tn_status |= TMPFS_NODE_CHANGED; 1261 tmpfs_update(dvp); 1262 1263 error = 0; 1264 1265out: 1266 return error; 1267} 1268 1269/* --------------------------------------------------------------------- */ 1270 1271static int 1272tmpfs_symlink(struct vop_symlink_args *v) 1273{ 1274 struct vnode *dvp = v->a_dvp; 1275 struct vnode **vpp = v->a_vpp; 1276 struct componentname *cnp = v->a_cnp; 1277 struct vattr *vap = v->a_vap; 1278 char *target = v->a_target; 1279 1280#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1281 MPASS(vap->va_type == VLNK); 1282#else 1283 vap->va_type = VLNK; 1284#endif 1285 1286 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1287} 1288 1289/* --------------------------------------------------------------------- */ 1290 1291static int 1292tmpfs_readdir(struct vop_readdir_args *v) 1293{ 1294 struct vnode *vp = v->a_vp; 1295 struct uio *uio = v->a_uio; 1296 int *eofflag = v->a_eofflag; 1297 u_long **cookies = v->a_cookies; 1298 int *ncookies = v->a_ncookies; 1299 1300 int error; 1301 off_t startoff; 1302 off_t cnt = 0; 1303 struct tmpfs_node *node; 1304 1305 /* This operation only makes sense on directory nodes. */ 1306 if (vp->v_type != VDIR) 1307 return ENOTDIR; 1308 1309 node = VP_TO_TMPFS_DIR(vp); 1310 1311 startoff = uio->uio_offset; 1312 1313 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1314 error = tmpfs_dir_getdotdent(node, uio); 1315 if (error != 0) 1316 goto outok; 1317 cnt++; 1318 } 1319 1320 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1321 error = tmpfs_dir_getdotdotdent(node, uio); 1322 if (error != 0) 1323 goto outok; 1324 cnt++; 1325 } 1326 1327 error = tmpfs_dir_getdents(node, uio, &cnt); 1328 1329outok: 1330 MPASS(error >= -1); 1331 1332 if (error == -1) 1333 error = 0; 1334 1335 if (eofflag != NULL) 1336 *eofflag = 1337 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1338 1339 /* Update NFS-related variables. */ 1340 if (error == 0 && cookies != NULL && ncookies != NULL) { 1341 off_t i; 1342 off_t off = startoff; 1343 struct tmpfs_dirent *de = NULL; 1344 1345 *ncookies = cnt; 1346 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1347 1348 for (i = 0; i < cnt; i++) { 1349 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1350 if (off == TMPFS_DIRCOOKIE_DOT) { 1351 off = TMPFS_DIRCOOKIE_DOTDOT; 1352 } else { 1353 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1354 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1355 } else if (de != NULL) { 1356 de = TAILQ_NEXT(de, td_entries); 1357 } else { 1358 de = tmpfs_dir_lookupbycookie(node, 1359 off); 1360 MPASS(de != NULL); 1361 de = TAILQ_NEXT(de, td_entries); 1362 } 1363 if (de == NULL) 1364 off = TMPFS_DIRCOOKIE_EOF; 1365 else 1366 off = tmpfs_dircookie(de); 1367 } 1368 1369 (*cookies)[i] = off; 1370 } 1371 MPASS(uio->uio_offset == off); 1372 } 1373 1374 return error; 1375} 1376 1377/* --------------------------------------------------------------------- */ 1378 1379static int 1380tmpfs_readlink(struct vop_readlink_args *v) 1381{ 1382 struct vnode *vp = v->a_vp; 1383 struct uio *uio = v->a_uio; 1384 1385 int error; 1386 struct tmpfs_node *node; 1387 1388 MPASS(uio->uio_offset == 0); 1389 MPASS(vp->v_type == VLNK); 1390 1391 node = VP_TO_TMPFS_NODE(vp); 1392 1393 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1394 uio); 1395 node->tn_status |= TMPFS_NODE_ACCESSED; 1396 1397 return error; 1398} 1399 1400/* --------------------------------------------------------------------- */ 1401 1402static int 1403tmpfs_inactive(struct vop_inactive_args *v) 1404{ 1405 struct vnode *vp = v->a_vp; 1406 struct thread *l = v->a_td; 1407 1408 struct tmpfs_node *node; 1409 1410 MPASS(VOP_ISLOCKED(vp)); 1411 1412 node = VP_TO_TMPFS_NODE(vp); 1413 1414 if (node->tn_links == 0) 1415 vrecycle(vp, l); 1416 1417 return 0; 1418} 1419 1420/* --------------------------------------------------------------------- */ 1421 1422int 1423tmpfs_reclaim(struct vop_reclaim_args *v) 1424{ 1425 struct vnode *vp = v->a_vp; 1426 1427 struct tmpfs_mount *tmp; 1428 struct tmpfs_node *node; 1429 1430 node = VP_TO_TMPFS_NODE(vp); 1431 tmp = VFS_TO_TMPFS(vp->v_mount); 1432 1433 vnode_destroy_vobject(vp); 1434 cache_purge(vp); 1435 1436 TMPFS_NODE_LOCK(node); 1437 TMPFS_ASSERT_ELOCKED(node); 1438 tmpfs_free_vp(vp); 1439 1440 /* If the node referenced by this vnode was deleted by the user, 1441 * we must free its associated data structures (now that the vnode 1442 * is being reclaimed). */ 1443 if (node->tn_links == 0 && 1444 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1445 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1446 TMPFS_NODE_UNLOCK(node); 1447 tmpfs_free_node(tmp, node); 1448 } else 1449 TMPFS_NODE_UNLOCK(node); 1450 1451 MPASS(vp->v_data == NULL); 1452 return 0; 1453} 1454 1455/* --------------------------------------------------------------------- */ 1456 1457static int 1458tmpfs_print(struct vop_print_args *v) 1459{ 1460 struct vnode *vp = v->a_vp; 1461 1462 struct tmpfs_node *node; 1463 1464 node = VP_TO_TMPFS_NODE(vp); 1465 1466 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1467 node, node->tn_flags, node->tn_links); 1468 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1469 ", status 0x%x\n", 1470 node->tn_mode, node->tn_uid, node->tn_gid, 1471 (uintmax_t)node->tn_size, node->tn_status); 1472 1473 if (vp->v_type == VFIFO) 1474 fifo_printinfo(vp); 1475 1476 printf("\n"); 1477 1478 return 0; 1479} 1480 1481/* --------------------------------------------------------------------- */ 1482 1483static int 1484tmpfs_pathconf(struct vop_pathconf_args *v) 1485{ 1486 int name = v->a_name; 1487 register_t *retval = v->a_retval; 1488 1489 int error; 1490 1491 error = 0; 1492 1493 switch (name) { 1494 case _PC_LINK_MAX: 1495 *retval = LINK_MAX; 1496 break; 1497 1498 case _PC_NAME_MAX: 1499 *retval = NAME_MAX; 1500 break; 1501 1502 case _PC_PATH_MAX: 1503 *retval = PATH_MAX; 1504 break; 1505 1506 case _PC_PIPE_BUF: 1507 *retval = PIPE_BUF; 1508 break; 1509 1510 case _PC_CHOWN_RESTRICTED: 1511 *retval = 1; 1512 break; 1513 1514 case _PC_NO_TRUNC: 1515 *retval = 1; 1516 break; 1517 1518 case _PC_SYNC_IO: 1519 *retval = 1; 1520 break; 1521 1522 case _PC_FILESIZEBITS: 1523 *retval = 0; /* XXX Don't know which value should I return. */ 1524 break; 1525 1526 default: 1527 error = EINVAL; 1528 } 1529 1530 return error; 1531} 1532 1533static int 1534tmpfs_vptofh(struct vop_vptofh_args *ap) 1535{ 1536 struct tmpfs_fid *tfhp; 1537 struct tmpfs_node *node; 1538 1539 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1540 node = VP_TO_TMPFS_NODE(ap->a_vp); 1541 1542 tfhp->tf_len = sizeof(struct tmpfs_fid); 1543 tfhp->tf_id = node->tn_id; 1544 tfhp->tf_gen = node->tn_gen; 1545 1546 return (0); 1547} 1548 1549/* --------------------------------------------------------------------- */ 1550 1551/* 1552 * vnode operations vector used for files stored in a tmpfs file system. 1553 */ 1554struct vop_vector tmpfs_vnodeop_entries = { 1555 .vop_default = &default_vnodeops, 1556 .vop_lookup = vfs_cache_lookup, 1557 .vop_cachedlookup = tmpfs_lookup, 1558 .vop_create = tmpfs_create, 1559 .vop_mknod = tmpfs_mknod, 1560 .vop_open = tmpfs_open, 1561 .vop_close = tmpfs_close, 1562 .vop_access = tmpfs_access, 1563 .vop_getattr = tmpfs_getattr, 1564 .vop_setattr = tmpfs_setattr, 1565 .vop_read = tmpfs_read, 1566 .vop_write = tmpfs_write, 1567 .vop_fsync = tmpfs_fsync, 1568 .vop_remove = tmpfs_remove, 1569 .vop_link = tmpfs_link, 1570 .vop_rename = tmpfs_rename, 1571 .vop_mkdir = tmpfs_mkdir, 1572 .vop_rmdir = tmpfs_rmdir, 1573 .vop_symlink = tmpfs_symlink, 1574 .vop_readdir = tmpfs_readdir, 1575 .vop_readlink = tmpfs_readlink, 1576 .vop_inactive = tmpfs_inactive, 1577 .vop_reclaim = tmpfs_reclaim, 1578 .vop_print = tmpfs_print, 1579 .vop_pathconf = tmpfs_pathconf, 1580 .vop_vptofh = tmpfs_vptofh, 1581 .vop_bmap = VOP_EOPNOTSUPP, 1582}; 1583 1584