tmpfs_vnops.c revision 213735
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 213735 2010-10-12 17:16:51Z avg $"); 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 && de->td_node == NULL) 113 cnp->cn_flags |= ISWHITEOUT; 114 if (de == NULL || de->td_node == NULL) { 115 /* The entry was not found in the directory. 116 * This is OK if we are creating or renaming an 117 * entry and are working on the last component of 118 * the path name. */ 119 if ((cnp->cn_flags & ISLASTCN) && 120 (cnp->cn_nameiop == CREATE || \ 121 cnp->cn_nameiop == RENAME || 122 (cnp->cn_nameiop == DELETE && 123 cnp->cn_flags & DOWHITEOUT && 124 cnp->cn_flags & ISWHITEOUT))) { 125 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 126 cnp->cn_thread); 127 if (error != 0) 128 goto out; 129 130 /* Keep the component name in the buffer for 131 * future uses. */ 132 cnp->cn_flags |= SAVENAME; 133 134 error = EJUSTRETURN; 135 } else 136 error = ENOENT; 137 } else { 138 struct tmpfs_node *tnode; 139 140 /* The entry was found, so get its associated 141 * tmpfs_node. */ 142 tnode = de->td_node; 143 144 /* If we are not at the last path component and 145 * found a non-directory or non-link entry (which 146 * may itself be pointing to a directory), raise 147 * an error. */ 148 if ((tnode->tn_type != VDIR && 149 tnode->tn_type != VLNK) && 150 !(cnp->cn_flags & ISLASTCN)) { 151 error = ENOTDIR; 152 goto out; 153 } 154 155 /* If we are deleting or renaming the entry, keep 156 * track of its tmpfs_dirent so that it can be 157 * easily deleted later. */ 158 if ((cnp->cn_flags & ISLASTCN) && 159 (cnp->cn_nameiop == DELETE || 160 cnp->cn_nameiop == RENAME)) { 161 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 162 cnp->cn_thread); 163 if (error != 0) 164 goto out; 165 166 /* Allocate a new vnode on the matching entry. */ 167 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 168 cnp->cn_lkflags, vpp); 169 if (error != 0) 170 goto out; 171 172 if ((dnode->tn_mode & S_ISTXT) && 173 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 174 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 175 error = EPERM; 176 vput(*vpp); 177 *vpp = NULL; 178 goto out; 179 } 180 cnp->cn_flags |= SAVENAME; 181 } else { 182 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 183 cnp->cn_lkflags, vpp); 184 } 185 } 186 } 187 188 /* Store the result of this lookup in the cache. Avoid this if the 189 * request was for creation, as it does not improve timings on 190 * emprical tests. */ 191 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 192 cache_enter(dvp, *vpp, cnp); 193 194out: 195 /* If there were no errors, *vpp cannot be null and it must be 196 * locked. */ 197 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 198 199 return error; 200} 201 202/* --------------------------------------------------------------------- */ 203 204static int 205tmpfs_create(struct vop_create_args *v) 206{ 207 struct vnode *dvp = v->a_dvp; 208 struct vnode **vpp = v->a_vpp; 209 struct componentname *cnp = v->a_cnp; 210 struct vattr *vap = v->a_vap; 211 212 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 213 214 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 215} 216/* --------------------------------------------------------------------- */ 217 218static int 219tmpfs_mknod(struct vop_mknod_args *v) 220{ 221 struct vnode *dvp = v->a_dvp; 222 struct vnode **vpp = v->a_vpp; 223 struct componentname *cnp = v->a_cnp; 224 struct vattr *vap = v->a_vap; 225 226 if (vap->va_type != VBLK && vap->va_type != VCHR && 227 vap->va_type != VFIFO) 228 return EINVAL; 229 230 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 231} 232 233/* --------------------------------------------------------------------- */ 234 235static int 236tmpfs_open(struct vop_open_args *v) 237{ 238 struct vnode *vp = v->a_vp; 239 int mode = v->a_mode; 240 241 int error; 242 struct tmpfs_node *node; 243 244 MPASS(VOP_ISLOCKED(vp)); 245 246 node = VP_TO_TMPFS_NODE(vp); 247 248 /* The file is still active but all its names have been removed 249 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 250 * it is about to die. */ 251 if (node->tn_links < 1) 252 return (ENOENT); 253 254 /* If the file is marked append-only, deny write requests. */ 255 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 256 error = EPERM; 257 else { 258 error = 0; 259 vnode_create_vobject(vp, node->tn_size, v->a_td); 260 } 261 262 MPASS(VOP_ISLOCKED(vp)); 263 return error; 264} 265 266/* --------------------------------------------------------------------- */ 267 268static int 269tmpfs_close(struct vop_close_args *v) 270{ 271 struct vnode *vp = v->a_vp; 272 273 struct tmpfs_node *node; 274 275 MPASS(VOP_ISLOCKED(vp)); 276 277 node = VP_TO_TMPFS_NODE(vp); 278 279 if (node->tn_links > 0) { 280 /* Update node times. No need to do it if the node has 281 * been deleted, because it will vanish after we return. */ 282 tmpfs_update(vp); 283 } 284 285 return 0; 286} 287 288/* --------------------------------------------------------------------- */ 289 290int 291tmpfs_access(struct vop_access_args *v) 292{ 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342} 343 344/* --------------------------------------------------------------------- */ 345 346int 347tmpfs_getattr(struct vop_getattr_args *v) 348{ 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379} 380 381/* --------------------------------------------------------------------- */ 382 383/* XXX Should this operation be atomic? I think it should, but code in 384 * XXX other places (e.g., ufs) doesn't seem to be... */ 385int 386tmpfs_setattr(struct vop_setattr_args *v) 387{ 388 struct vnode *vp = v->a_vp; 389 struct vattr *vap = v->a_vap; 390 struct ucred *cred = v->a_cred; 391 struct thread *td = curthread; 392 393 int error; 394 395 MPASS(VOP_ISLOCKED(vp)); 396 397 error = 0; 398 399 /* Abort if any unsettable attribute is given. */ 400 if (vap->va_type != VNON || 401 vap->va_nlink != VNOVAL || 402 vap->va_fsid != VNOVAL || 403 vap->va_fileid != VNOVAL || 404 vap->va_blocksize != VNOVAL || 405 vap->va_gen != VNOVAL || 406 vap->va_rdev != VNOVAL || 407 vap->va_bytes != VNOVAL) 408 error = EINVAL; 409 410 if (error == 0 && (vap->va_flags != VNOVAL)) 411 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 412 413 if (error == 0 && (vap->va_size != VNOVAL)) 414 error = tmpfs_chsize(vp, vap->va_size, cred, td); 415 416 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 420 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 421 422 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 423 vap->va_atime.tv_nsec != VNOVAL) || 424 (vap->va_mtime.tv_sec != VNOVAL && 425 vap->va_mtime.tv_nsec != VNOVAL) || 426 (vap->va_birthtime.tv_sec != VNOVAL && 427 vap->va_birthtime.tv_nsec != VNOVAL))) 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 &vap->va_birthtime, vap->va_vaflags, cred, td); 430 431 /* Update the node times. We give preference to the error codes 432 * generated by this function rather than the ones that may arise 433 * from tmpfs_update. */ 434 tmpfs_update(vp); 435 436 MPASS(VOP_ISLOCKED(vp)); 437 438 return error; 439} 440 441/* --------------------------------------------------------------------- */ 442static int 443tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 444 vm_offset_t offset, size_t tlen, struct uio *uio) 445{ 446 vm_page_t m; 447 int error; 448 449 VM_OBJECT_LOCK(tobj); 450 vm_object_pip_add(tobj, 1); 451 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 452 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 453 if (m->valid != VM_PAGE_BITS_ALL) { 454 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 455 error = vm_pager_get_pages(tobj, &m, 1, 0); 456 if (error != 0) { 457 printf("tmpfs get pages from pager error [read]\n"); 458 goto out; 459 } 460 } else 461 vm_page_zero_invalid(m, TRUE); 462 } 463 VM_OBJECT_UNLOCK(tobj); 464 error = uiomove_fromphys(&m, offset, tlen, uio); 465 VM_OBJECT_LOCK(tobj); 466out: 467 vm_page_lock(m); 468 vm_page_unwire(m, TRUE); 469 vm_page_unlock(m); 470 vm_page_wakeup(m); 471 vm_object_pip_subtract(tobj, 1); 472 VM_OBJECT_UNLOCK(tobj); 473 474 return (error); 475} 476 477static __inline int 478tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 479 vm_offset_t offset, size_t tlen, void *buf) 480{ 481 struct uio uio; 482 struct iovec iov; 483 484 uio.uio_iovcnt = 1; 485 uio.uio_iov = &iov; 486 iov.iov_base = buf; 487 iov.iov_len = tlen; 488 489 uio.uio_offset = 0; 490 uio.uio_resid = tlen; 491 uio.uio_rw = UIO_READ; 492 uio.uio_segflg = UIO_SYSSPACE; 493 uio.uio_td = curthread; 494 495 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 496} 497 498static int 499tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 500{ 501 struct sf_buf *sf; 502 vm_pindex_t idx; 503 vm_page_t m; 504 vm_offset_t offset; 505 off_t addr; 506 size_t tlen; 507 char *ma; 508 int error; 509 510 addr = uio->uio_offset; 511 idx = OFF_TO_IDX(addr); 512 offset = addr & PAGE_MASK; 513 tlen = MIN(PAGE_SIZE - offset, len); 514 515 if ((vobj == NULL) || 516 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 517 goto nocache; 518 519 VM_OBJECT_LOCK(vobj); 520lookupvpg: 521 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 522 vm_page_is_valid(m, offset, tlen)) { 523 if ((m->oflags & VPO_BUSY) != 0) { 524 /* 525 * Reference the page before unlocking and sleeping so 526 * that the page daemon is less likely to reclaim it. 527 */ 528 vm_page_lock_queues(); 529 vm_page_flag_set(m, PG_REFERENCED); 530 vm_page_sleep(m, "tmfsmr"); 531 goto lookupvpg; 532 } 533 vm_page_busy(m); 534 VM_OBJECT_UNLOCK(vobj); 535 error = uiomove_fromphys(&m, offset, tlen, uio); 536 VM_OBJECT_LOCK(vobj); 537 vm_page_wakeup(m); 538 VM_OBJECT_UNLOCK(vobj); 539 return (error); 540 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 541 KASSERT(offset == 0, 542 ("unexpected offset in tmpfs_mappedread for sendfile")); 543 if ((m->oflags & VPO_BUSY) != 0) { 544 /* 545 * Reference the page before unlocking and sleeping so 546 * that the page daemon is less likely to reclaim it. 547 */ 548 vm_page_lock_queues(); 549 vm_page_flag_set(m, PG_REFERENCED); 550 vm_page_sleep(m, "tmfsmr"); 551 goto lookupvpg; 552 } 553 vm_page_busy(m); 554 VM_OBJECT_UNLOCK(vobj); 555 sched_pin(); 556 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 557 ma = (char *)sf_buf_kva(sf); 558 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 559 if (error == 0) { 560 if (tlen != PAGE_SIZE) 561 bzero(ma + tlen, PAGE_SIZE - tlen); 562 uio->uio_offset += tlen; 563 uio->uio_resid -= tlen; 564 } 565 sf_buf_free(sf); 566 sched_unpin(); 567 VM_OBJECT_LOCK(vobj); 568 if (error == 0) 569 m->valid = VM_PAGE_BITS_ALL; 570 vm_page_wakeup(m); 571 VM_OBJECT_UNLOCK(vobj); 572 return (error); 573 } 574 VM_OBJECT_UNLOCK(vobj); 575nocache: 576 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 577 578 return (error); 579} 580 581static int 582tmpfs_read(struct vop_read_args *v) 583{ 584 struct vnode *vp = v->a_vp; 585 struct uio *uio = v->a_uio; 586 587 struct tmpfs_node *node; 588 vm_object_t uobj; 589 size_t len; 590 int resid; 591 592 int error = 0; 593 594 node = VP_TO_TMPFS_NODE(vp); 595 596 if (vp->v_type != VREG) { 597 error = EISDIR; 598 goto out; 599 } 600 601 if (uio->uio_offset < 0) { 602 error = EINVAL; 603 goto out; 604 } 605 606 node->tn_status |= TMPFS_NODE_ACCESSED; 607 608 uobj = node->tn_reg.tn_aobj; 609 while ((resid = uio->uio_resid) > 0) { 610 error = 0; 611 if (node->tn_size <= uio->uio_offset) 612 break; 613 len = MIN(node->tn_size - uio->uio_offset, resid); 614 if (len == 0) 615 break; 616 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 617 if ((error != 0) || (resid == uio->uio_resid)) 618 break; 619 } 620 621out: 622 623 return error; 624} 625 626/* --------------------------------------------------------------------- */ 627 628static int 629tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 630{ 631 vm_pindex_t idx; 632 vm_page_t vpg, tpg; 633 vm_offset_t offset; 634 off_t addr; 635 size_t tlen; 636 int error; 637 638 error = 0; 639 640 addr = uio->uio_offset; 641 idx = OFF_TO_IDX(addr); 642 offset = addr & PAGE_MASK; 643 tlen = MIN(PAGE_SIZE - offset, len); 644 645 if ((vobj == NULL) || 646 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 647 vpg = NULL; 648 goto nocache; 649 } 650 651 VM_OBJECT_LOCK(vobj); 652lookupvpg: 653 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 654 vm_page_is_valid(vpg, offset, tlen)) { 655 if ((vpg->oflags & VPO_BUSY) != 0) { 656 /* 657 * Reference the page before unlocking and sleeping so 658 * that the page daemon is less likely to reclaim it. 659 */ 660 vm_page_lock_queues(); 661 vm_page_flag_set(vpg, PG_REFERENCED); 662 vm_page_sleep(vpg, "tmfsmw"); 663 goto lookupvpg; 664 } 665 vm_page_busy(vpg); 666 vm_page_undirty(vpg); 667 VM_OBJECT_UNLOCK(vobj); 668 error = uiomove_fromphys(&vpg, offset, tlen, uio); 669 } else { 670 if (__predict_false(vobj->cache != NULL)) 671 vm_page_cache_free(vobj, idx, idx + 1); 672 VM_OBJECT_UNLOCK(vobj); 673 vpg = NULL; 674 } 675nocache: 676 VM_OBJECT_LOCK(tobj); 677 vm_object_pip_add(tobj, 1); 678 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 679 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 680 if (tpg->valid != VM_PAGE_BITS_ALL) { 681 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 682 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 683 if (error != 0) { 684 printf("tmpfs get pages from pager error [write]\n"); 685 goto out; 686 } 687 } else 688 vm_page_zero_invalid(tpg, TRUE); 689 } 690 VM_OBJECT_UNLOCK(tobj); 691 if (vpg == NULL) 692 error = uiomove_fromphys(&tpg, offset, tlen, uio); 693 else { 694 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 695 pmap_copy_page(vpg, tpg); 696 } 697 VM_OBJECT_LOCK(tobj); 698out: 699 if (vobj != NULL) 700 VM_OBJECT_LOCK(vobj); 701 if (error == 0) { 702 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 703 ("parts of tpg invalid")); 704 vm_page_dirty(tpg); 705 } 706 vm_page_lock(tpg); 707 vm_page_unwire(tpg, TRUE); 708 vm_page_unlock(tpg); 709 vm_page_wakeup(tpg); 710 if (vpg != NULL) 711 vm_page_wakeup(vpg); 712 if (vobj != NULL) 713 VM_OBJECT_UNLOCK(vobj); 714 vm_object_pip_subtract(tobj, 1); 715 VM_OBJECT_UNLOCK(tobj); 716 717 return (error); 718} 719 720static int 721tmpfs_write(struct vop_write_args *v) 722{ 723 struct vnode *vp = v->a_vp; 724 struct uio *uio = v->a_uio; 725 int ioflag = v->a_ioflag; 726 727 boolean_t extended; 728 int error = 0; 729 off_t oldsize; 730 struct tmpfs_node *node; 731 vm_object_t uobj; 732 size_t len; 733 int resid; 734 735 node = VP_TO_TMPFS_NODE(vp); 736 oldsize = node->tn_size; 737 738 if (uio->uio_offset < 0 || vp->v_type != VREG) { 739 error = EINVAL; 740 goto out; 741 } 742 743 if (uio->uio_resid == 0) { 744 error = 0; 745 goto out; 746 } 747 748 if (ioflag & IO_APPEND) 749 uio->uio_offset = node->tn_size; 750 751 if (uio->uio_offset + uio->uio_resid > 752 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 753 return (EFBIG); 754 755 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 756 return (EFBIG); 757 758 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 759 if (extended) { 760 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 761 if (error != 0) 762 goto out; 763 } 764 765 uobj = node->tn_reg.tn_aobj; 766 while ((resid = uio->uio_resid) > 0) { 767 if (node->tn_size <= uio->uio_offset) 768 break; 769 len = MIN(node->tn_size - uio->uio_offset, resid); 770 if (len == 0) 771 break; 772 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 773 if ((error != 0) || (resid == uio->uio_resid)) 774 break; 775 } 776 777 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 778 (extended ? TMPFS_NODE_CHANGED : 0); 779 780 if (node->tn_mode & (S_ISUID | S_ISGID)) { 781 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 782 node->tn_mode &= ~(S_ISUID | S_ISGID); 783 } 784 785 if (error != 0) 786 (void)tmpfs_reg_resize(vp, oldsize); 787 788out: 789 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 790 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 791 792 return error; 793} 794 795/* --------------------------------------------------------------------- */ 796 797static int 798tmpfs_fsync(struct vop_fsync_args *v) 799{ 800 struct vnode *vp = v->a_vp; 801 802 MPASS(VOP_ISLOCKED(vp)); 803 804 tmpfs_update(vp); 805 806 return 0; 807} 808 809/* --------------------------------------------------------------------- */ 810 811static int 812tmpfs_remove(struct vop_remove_args *v) 813{ 814 struct vnode *dvp = v->a_dvp; 815 struct vnode *vp = v->a_vp; 816 817 int error; 818 struct tmpfs_dirent *de; 819 struct tmpfs_mount *tmp; 820 struct tmpfs_node *dnode; 821 struct tmpfs_node *node; 822 823 MPASS(VOP_ISLOCKED(dvp)); 824 MPASS(VOP_ISLOCKED(vp)); 825 826 if (vp->v_type == VDIR) { 827 error = EISDIR; 828 goto out; 829 } 830 831 dnode = VP_TO_TMPFS_DIR(dvp); 832 node = VP_TO_TMPFS_NODE(vp); 833 tmp = VFS_TO_TMPFS(vp->v_mount); 834 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 835 MPASS(de != NULL); 836 837 /* Files marked as immutable or append-only cannot be deleted. */ 838 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 839 (dnode->tn_flags & APPEND)) { 840 error = EPERM; 841 goto out; 842 } 843 844 /* Remove the entry from the directory; as it is a file, we do not 845 * have to change the number of hard links of the directory. */ 846 tmpfs_dir_detach(dvp, de); 847 if (v->a_cnp->cn_flags & DOWHITEOUT) 848 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 849 850 /* Free the directory entry we just deleted. Note that the node 851 * referred by it will not be removed until the vnode is really 852 * reclaimed. */ 853 tmpfs_free_dirent(tmp, de, TRUE); 854 855 if (node->tn_links > 0) 856 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 857 TMPFS_NODE_MODIFIED; 858 error = 0; 859 860out: 861 862 return error; 863} 864 865/* --------------------------------------------------------------------- */ 866 867static int 868tmpfs_link(struct vop_link_args *v) 869{ 870 struct vnode *dvp = v->a_tdvp; 871 struct vnode *vp = v->a_vp; 872 struct componentname *cnp = v->a_cnp; 873 874 int error; 875 struct tmpfs_dirent *de; 876 struct tmpfs_node *node; 877 878 MPASS(VOP_ISLOCKED(dvp)); 879 MPASS(cnp->cn_flags & HASBUF); 880 MPASS(dvp != vp); /* XXX When can this be false? */ 881 882 node = VP_TO_TMPFS_NODE(vp); 883 884 /* XXX: Why aren't the following two tests done by the caller? */ 885 886 /* Hard links of directories are forbidden. */ 887 if (vp->v_type == VDIR) { 888 error = EPERM; 889 goto out; 890 } 891 892 /* Cannot create cross-device links. */ 893 if (dvp->v_mount != vp->v_mount) { 894 error = EXDEV; 895 goto out; 896 } 897 898 /* Ensure that we do not overflow the maximum number of links imposed 899 * by the system. */ 900 MPASS(node->tn_links <= LINK_MAX); 901 if (node->tn_links == LINK_MAX) { 902 error = EMLINK; 903 goto out; 904 } 905 906 /* We cannot create links of files marked immutable or append-only. */ 907 if (node->tn_flags & (IMMUTABLE | APPEND)) { 908 error = EPERM; 909 goto out; 910 } 911 912 /* Allocate a new directory entry to represent the node. */ 913 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 914 cnp->cn_nameptr, cnp->cn_namelen, &de); 915 if (error != 0) 916 goto out; 917 918 /* Insert the new directory entry into the appropriate directory. */ 919 if (cnp->cn_flags & ISWHITEOUT) 920 tmpfs_dir_whiteout_remove(dvp, cnp); 921 tmpfs_dir_attach(dvp, de); 922 923 /* vp link count has changed, so update node times. */ 924 node->tn_status |= TMPFS_NODE_CHANGED; 925 tmpfs_update(vp); 926 927 error = 0; 928 929out: 930 return error; 931} 932 933/* --------------------------------------------------------------------- */ 934 935static int 936tmpfs_rename(struct vop_rename_args *v) 937{ 938 struct vnode *fdvp = v->a_fdvp; 939 struct vnode *fvp = v->a_fvp; 940 struct componentname *fcnp = v->a_fcnp; 941 struct vnode *tdvp = v->a_tdvp; 942 struct vnode *tvp = v->a_tvp; 943 struct componentname *tcnp = v->a_tcnp; 944 945 char *newname; 946 int error; 947 struct tmpfs_dirent *de; 948 struct tmpfs_mount *tmp; 949 struct tmpfs_node *fdnode; 950 struct tmpfs_node *fnode; 951 struct tmpfs_node *tnode; 952 struct tmpfs_node *tdnode; 953 954 MPASS(VOP_ISLOCKED(tdvp)); 955 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 956 MPASS(fcnp->cn_flags & HASBUF); 957 MPASS(tcnp->cn_flags & HASBUF); 958 959 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 960 961 /* Disallow cross-device renames. 962 * XXX Why isn't this done by the caller? */ 963 if (fvp->v_mount != tdvp->v_mount || 964 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 965 error = EXDEV; 966 goto out; 967 } 968 969 tmp = VFS_TO_TMPFS(tdvp->v_mount); 970 tdnode = VP_TO_TMPFS_DIR(tdvp); 971 972 /* If source and target are the same file, there is nothing to do. */ 973 if (fvp == tvp) { 974 error = 0; 975 goto out; 976 } 977 978 /* If we need to move the directory between entries, lock the 979 * source so that we can safely operate on it. */ 980 if (tdvp != fdvp) { 981 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 982 if (error != 0) 983 goto out; 984 } 985 fdnode = VP_TO_TMPFS_DIR(fdvp); 986 fnode = VP_TO_TMPFS_NODE(fvp); 987 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 988 989 /* Entry can disappear before we lock fdvp, 990 * also avoid manipulating '.' and '..' entries. */ 991 if (de == NULL) { 992 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 993 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 994 error = EINVAL; 995 else 996 error = ENOENT; 997 goto out_locked; 998 } 999 MPASS(de->td_node == fnode); 1000 1001 /* If re-naming a directory to another preexisting directory 1002 * ensure that the target directory is empty so that its 1003 * removal causes no side effects. 1004 * Kern_rename gurantees the destination to be a directory 1005 * if the source is one. */ 1006 if (tvp != NULL) { 1007 MPASS(tnode != NULL); 1008 1009 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1010 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1011 error = EPERM; 1012 goto out_locked; 1013 } 1014 1015 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1016 if (tnode->tn_size > 0) { 1017 error = ENOTEMPTY; 1018 goto out_locked; 1019 } 1020 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1021 error = ENOTDIR; 1022 goto out_locked; 1023 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1024 error = EISDIR; 1025 goto out_locked; 1026 } else { 1027 MPASS(fnode->tn_type != VDIR && 1028 tnode->tn_type != VDIR); 1029 } 1030 } 1031 1032 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1033 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1034 error = EPERM; 1035 goto out_locked; 1036 } 1037 1038 /* Ensure that we have enough memory to hold the new name, if it 1039 * has to be changed. */ 1040 if (fcnp->cn_namelen != tcnp->cn_namelen || 1041 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1042 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1043 } else 1044 newname = NULL; 1045 1046 /* If the node is being moved to another directory, we have to do 1047 * the move. */ 1048 if (fdnode != tdnode) { 1049 /* In case we are moving a directory, we have to adjust its 1050 * parent to point to the new parent. */ 1051 if (de->td_node->tn_type == VDIR) { 1052 struct tmpfs_node *n; 1053 1054 /* Ensure the target directory is not a child of the 1055 * directory being moved. Otherwise, we'd end up 1056 * with stale nodes. */ 1057 n = tdnode; 1058 /* TMPFS_LOCK garanties that no nodes are freed while 1059 * traversing the list. Nodes can only be marked as 1060 * removed: tn_parent == NULL. */ 1061 TMPFS_LOCK(tmp); 1062 TMPFS_NODE_LOCK(n); 1063 while (n != n->tn_dir.tn_parent) { 1064 struct tmpfs_node *parent; 1065 1066 if (n == fnode) { 1067 TMPFS_NODE_UNLOCK(n); 1068 TMPFS_UNLOCK(tmp); 1069 error = EINVAL; 1070 if (newname != NULL) 1071 free(newname, M_TMPFSNAME); 1072 goto out_locked; 1073 } 1074 parent = n->tn_dir.tn_parent; 1075 TMPFS_NODE_UNLOCK(n); 1076 if (parent == NULL) { 1077 n = NULL; 1078 break; 1079 } 1080 TMPFS_NODE_LOCK(parent); 1081 if (parent->tn_dir.tn_parent == NULL) { 1082 TMPFS_NODE_UNLOCK(parent); 1083 n = NULL; 1084 break; 1085 } 1086 n = parent; 1087 } 1088 TMPFS_UNLOCK(tmp); 1089 if (n == NULL) { 1090 error = EINVAL; 1091 if (newname != NULL) 1092 free(newname, M_TMPFSNAME); 1093 goto out_locked; 1094 } 1095 TMPFS_NODE_UNLOCK(n); 1096 1097 /* Adjust the parent pointer. */ 1098 TMPFS_VALIDATE_DIR(fnode); 1099 TMPFS_NODE_LOCK(de->td_node); 1100 de->td_node->tn_dir.tn_parent = tdnode; 1101 TMPFS_NODE_UNLOCK(de->td_node); 1102 1103 /* As a result of changing the target of the '..' 1104 * entry, the link count of the source and target 1105 * directories has to be adjusted. */ 1106 TMPFS_NODE_LOCK(tdnode); 1107 TMPFS_ASSERT_LOCKED(tdnode); 1108 tdnode->tn_links++; 1109 TMPFS_NODE_UNLOCK(tdnode); 1110 1111 TMPFS_NODE_LOCK(fdnode); 1112 TMPFS_ASSERT_LOCKED(fdnode); 1113 fdnode->tn_links--; 1114 TMPFS_NODE_UNLOCK(fdnode); 1115 } 1116 1117 /* Do the move: just remove the entry from the source directory 1118 * and insert it into the target one. */ 1119 tmpfs_dir_detach(fdvp, de); 1120 if (fcnp->cn_flags & DOWHITEOUT) 1121 tmpfs_dir_whiteout_add(fdvp, fcnp); 1122 if (tcnp->cn_flags & ISWHITEOUT) 1123 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1124 tmpfs_dir_attach(tdvp, de); 1125 } 1126 1127 /* If the name has changed, we need to make it effective by changing 1128 * it in the directory entry. */ 1129 if (newname != NULL) { 1130 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1131 1132 free(de->td_name, M_TMPFSNAME); 1133 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1134 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1135 de->td_name = newname; 1136 1137 fnode->tn_status |= TMPFS_NODE_CHANGED; 1138 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1139 } 1140 1141 /* If we are overwriting an entry, we have to remove the old one 1142 * from the target directory. */ 1143 if (tvp != NULL) { 1144 /* Remove the old entry from the target directory. */ 1145 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1146 tmpfs_dir_detach(tdvp, de); 1147 1148 /* Free the directory entry we just deleted. Note that the 1149 * node referred by it will not be removed until the vnode is 1150 * really reclaimed. */ 1151 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1152 } 1153 1154 error = 0; 1155 1156out_locked: 1157 if (fdnode != tdnode) 1158 VOP_UNLOCK(fdvp, 0); 1159 1160out: 1161 /* Release target nodes. */ 1162 /* XXX: I don't understand when tdvp can be the same as tvp, but 1163 * other code takes care of this... */ 1164 if (tdvp == tvp) 1165 vrele(tdvp); 1166 else 1167 vput(tdvp); 1168 if (tvp != NULL) 1169 vput(tvp); 1170 1171 /* Release source nodes. */ 1172 vrele(fdvp); 1173 vrele(fvp); 1174 1175 return error; 1176} 1177 1178/* --------------------------------------------------------------------- */ 1179 1180static int 1181tmpfs_mkdir(struct vop_mkdir_args *v) 1182{ 1183 struct vnode *dvp = v->a_dvp; 1184 struct vnode **vpp = v->a_vpp; 1185 struct componentname *cnp = v->a_cnp; 1186 struct vattr *vap = v->a_vap; 1187 1188 MPASS(vap->va_type == VDIR); 1189 1190 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1191} 1192 1193/* --------------------------------------------------------------------- */ 1194 1195static int 1196tmpfs_rmdir(struct vop_rmdir_args *v) 1197{ 1198 struct vnode *dvp = v->a_dvp; 1199 struct vnode *vp = v->a_vp; 1200 1201 int error; 1202 struct tmpfs_dirent *de; 1203 struct tmpfs_mount *tmp; 1204 struct tmpfs_node *dnode; 1205 struct tmpfs_node *node; 1206 1207 MPASS(VOP_ISLOCKED(dvp)); 1208 MPASS(VOP_ISLOCKED(vp)); 1209 1210 tmp = VFS_TO_TMPFS(dvp->v_mount); 1211 dnode = VP_TO_TMPFS_DIR(dvp); 1212 node = VP_TO_TMPFS_DIR(vp); 1213 1214 /* Directories with more than two entries ('.' and '..') cannot be 1215 * removed. */ 1216 if (node->tn_size > 0) { 1217 error = ENOTEMPTY; 1218 goto out; 1219 } 1220 1221 if ((dnode->tn_flags & APPEND) 1222 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1223 error = EPERM; 1224 goto out; 1225 } 1226 1227 /* This invariant holds only if we are not trying to remove "..". 1228 * We checked for that above so this is safe now. */ 1229 MPASS(node->tn_dir.tn_parent == dnode); 1230 1231 /* Get the directory entry associated with node (vp). This was 1232 * filled by tmpfs_lookup while looking up the entry. */ 1233 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1234 MPASS(TMPFS_DIRENT_MATCHES(de, 1235 v->a_cnp->cn_nameptr, 1236 v->a_cnp->cn_namelen)); 1237 1238 /* Check flags to see if we are allowed to remove the directory. */ 1239 if (dnode->tn_flags & APPEND 1240 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1241 error = EPERM; 1242 goto out; 1243 } 1244 1245 1246 /* Detach the directory entry from the directory (dnode). */ 1247 tmpfs_dir_detach(dvp, de); 1248 if (v->a_cnp->cn_flags & DOWHITEOUT) 1249 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1250 1251 /* No vnode should be allocated for this entry from this point */ 1252 TMPFS_NODE_LOCK(node); 1253 TMPFS_ASSERT_ELOCKED(node); 1254 node->tn_links--; 1255 node->tn_dir.tn_parent = NULL; 1256 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1257 TMPFS_NODE_MODIFIED; 1258 1259 TMPFS_NODE_UNLOCK(node); 1260 1261 TMPFS_NODE_LOCK(dnode); 1262 TMPFS_ASSERT_ELOCKED(dnode); 1263 dnode->tn_links--; 1264 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1265 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1266 TMPFS_NODE_UNLOCK(dnode); 1267 1268 cache_purge(dvp); 1269 cache_purge(vp); 1270 1271 /* Free the directory entry we just deleted. Note that the node 1272 * referred by it will not be removed until the vnode is really 1273 * reclaimed. */ 1274 tmpfs_free_dirent(tmp, de, TRUE); 1275 1276 /* Release the deleted vnode (will destroy the node, notify 1277 * interested parties and clean it from the cache). */ 1278 1279 dnode->tn_status |= TMPFS_NODE_CHANGED; 1280 tmpfs_update(dvp); 1281 1282 error = 0; 1283 1284out: 1285 return error; 1286} 1287 1288/* --------------------------------------------------------------------- */ 1289 1290static int 1291tmpfs_symlink(struct vop_symlink_args *v) 1292{ 1293 struct vnode *dvp = v->a_dvp; 1294 struct vnode **vpp = v->a_vpp; 1295 struct componentname *cnp = v->a_cnp; 1296 struct vattr *vap = v->a_vap; 1297 char *target = v->a_target; 1298 1299#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1300 MPASS(vap->va_type == VLNK); 1301#else 1302 vap->va_type = VLNK; 1303#endif 1304 1305 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1306} 1307 1308/* --------------------------------------------------------------------- */ 1309 1310static int 1311tmpfs_readdir(struct vop_readdir_args *v) 1312{ 1313 struct vnode *vp = v->a_vp; 1314 struct uio *uio = v->a_uio; 1315 int *eofflag = v->a_eofflag; 1316 u_long **cookies = v->a_cookies; 1317 int *ncookies = v->a_ncookies; 1318 1319 int error; 1320 off_t startoff; 1321 off_t cnt = 0; 1322 struct tmpfs_node *node; 1323 1324 /* This operation only makes sense on directory nodes. */ 1325 if (vp->v_type != VDIR) 1326 return ENOTDIR; 1327 1328 node = VP_TO_TMPFS_DIR(vp); 1329 1330 startoff = uio->uio_offset; 1331 1332 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1333 error = tmpfs_dir_getdotdent(node, uio); 1334 if (error != 0) 1335 goto outok; 1336 cnt++; 1337 } 1338 1339 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1340 error = tmpfs_dir_getdotdotdent(node, uio); 1341 if (error != 0) 1342 goto outok; 1343 cnt++; 1344 } 1345 1346 error = tmpfs_dir_getdents(node, uio, &cnt); 1347 1348outok: 1349 MPASS(error >= -1); 1350 1351 if (error == -1) 1352 error = 0; 1353 1354 if (eofflag != NULL) 1355 *eofflag = 1356 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1357 1358 /* Update NFS-related variables. */ 1359 if (error == 0 && cookies != NULL && ncookies != NULL) { 1360 off_t i; 1361 off_t off = startoff; 1362 struct tmpfs_dirent *de = NULL; 1363 1364 *ncookies = cnt; 1365 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1366 1367 for (i = 0; i < cnt; i++) { 1368 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1369 if (off == TMPFS_DIRCOOKIE_DOT) { 1370 off = TMPFS_DIRCOOKIE_DOTDOT; 1371 } else { 1372 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1373 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1374 } else if (de != NULL) { 1375 de = TAILQ_NEXT(de, td_entries); 1376 } else { 1377 de = tmpfs_dir_lookupbycookie(node, 1378 off); 1379 MPASS(de != NULL); 1380 de = TAILQ_NEXT(de, td_entries); 1381 } 1382 if (de == NULL) 1383 off = TMPFS_DIRCOOKIE_EOF; 1384 else 1385 off = tmpfs_dircookie(de); 1386 } 1387 1388 (*cookies)[i] = off; 1389 } 1390 MPASS(uio->uio_offset == off); 1391 } 1392 1393 return error; 1394} 1395 1396/* --------------------------------------------------------------------- */ 1397 1398static int 1399tmpfs_readlink(struct vop_readlink_args *v) 1400{ 1401 struct vnode *vp = v->a_vp; 1402 struct uio *uio = v->a_uio; 1403 1404 int error; 1405 struct tmpfs_node *node; 1406 1407 MPASS(uio->uio_offset == 0); 1408 MPASS(vp->v_type == VLNK); 1409 1410 node = VP_TO_TMPFS_NODE(vp); 1411 1412 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1413 uio); 1414 node->tn_status |= TMPFS_NODE_ACCESSED; 1415 1416 return error; 1417} 1418 1419/* --------------------------------------------------------------------- */ 1420 1421static int 1422tmpfs_inactive(struct vop_inactive_args *v) 1423{ 1424 struct vnode *vp = v->a_vp; 1425 struct thread *l = v->a_td; 1426 1427 struct tmpfs_node *node; 1428 1429 MPASS(VOP_ISLOCKED(vp)); 1430 1431 node = VP_TO_TMPFS_NODE(vp); 1432 1433 if (node->tn_links == 0) 1434 vrecycle(vp, l); 1435 1436 return 0; 1437} 1438 1439/* --------------------------------------------------------------------- */ 1440 1441int 1442tmpfs_reclaim(struct vop_reclaim_args *v) 1443{ 1444 struct vnode *vp = v->a_vp; 1445 1446 struct tmpfs_mount *tmp; 1447 struct tmpfs_node *node; 1448 1449 node = VP_TO_TMPFS_NODE(vp); 1450 tmp = VFS_TO_TMPFS(vp->v_mount); 1451 1452 vnode_destroy_vobject(vp); 1453 cache_purge(vp); 1454 1455 TMPFS_NODE_LOCK(node); 1456 TMPFS_ASSERT_ELOCKED(node); 1457 tmpfs_free_vp(vp); 1458 1459 /* If the node referenced by this vnode was deleted by the user, 1460 * we must free its associated data structures (now that the vnode 1461 * is being reclaimed). */ 1462 if (node->tn_links == 0 && 1463 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1464 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1465 TMPFS_NODE_UNLOCK(node); 1466 tmpfs_free_node(tmp, node); 1467 } else 1468 TMPFS_NODE_UNLOCK(node); 1469 1470 MPASS(vp->v_data == NULL); 1471 return 0; 1472} 1473 1474/* --------------------------------------------------------------------- */ 1475 1476static int 1477tmpfs_print(struct vop_print_args *v) 1478{ 1479 struct vnode *vp = v->a_vp; 1480 1481 struct tmpfs_node *node; 1482 1483 node = VP_TO_TMPFS_NODE(vp); 1484 1485 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1486 node, node->tn_flags, node->tn_links); 1487 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1488 ", status 0x%x\n", 1489 node->tn_mode, node->tn_uid, node->tn_gid, 1490 (uintmax_t)node->tn_size, node->tn_status); 1491 1492 if (vp->v_type == VFIFO) 1493 fifo_printinfo(vp); 1494 1495 printf("\n"); 1496 1497 return 0; 1498} 1499 1500/* --------------------------------------------------------------------- */ 1501 1502static int 1503tmpfs_pathconf(struct vop_pathconf_args *v) 1504{ 1505 int name = v->a_name; 1506 register_t *retval = v->a_retval; 1507 1508 int error; 1509 1510 error = 0; 1511 1512 switch (name) { 1513 case _PC_LINK_MAX: 1514 *retval = LINK_MAX; 1515 break; 1516 1517 case _PC_NAME_MAX: 1518 *retval = NAME_MAX; 1519 break; 1520 1521 case _PC_PATH_MAX: 1522 *retval = PATH_MAX; 1523 break; 1524 1525 case _PC_PIPE_BUF: 1526 *retval = PIPE_BUF; 1527 break; 1528 1529 case _PC_CHOWN_RESTRICTED: 1530 *retval = 1; 1531 break; 1532 1533 case _PC_NO_TRUNC: 1534 *retval = 1; 1535 break; 1536 1537 case _PC_SYNC_IO: 1538 *retval = 1; 1539 break; 1540 1541 case _PC_FILESIZEBITS: 1542 *retval = 0; /* XXX Don't know which value should I return. */ 1543 break; 1544 1545 default: 1546 error = EINVAL; 1547 } 1548 1549 return error; 1550} 1551 1552static int 1553tmpfs_vptofh(struct vop_vptofh_args *ap) 1554{ 1555 struct tmpfs_fid *tfhp; 1556 struct tmpfs_node *node; 1557 1558 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1559 node = VP_TO_TMPFS_NODE(ap->a_vp); 1560 1561 tfhp->tf_len = sizeof(struct tmpfs_fid); 1562 tfhp->tf_id = node->tn_id; 1563 tfhp->tf_gen = node->tn_gen; 1564 1565 return (0); 1566} 1567 1568static int 1569tmpfs_whiteout(struct vop_whiteout_args *ap) 1570{ 1571 struct vnode *dvp = ap->a_dvp; 1572 struct componentname *cnp = ap->a_cnp; 1573 struct tmpfs_dirent *de; 1574 1575 switch (ap->a_flags) { 1576 case LOOKUP: 1577 return (0); 1578 case CREATE: 1579 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1580 if (de != NULL) 1581 return (de->td_node == NULL ? 0 : EEXIST); 1582 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1583 case DELETE: 1584 tmpfs_dir_whiteout_remove(dvp, cnp); 1585 return (0); 1586 default: 1587 panic("tmpfs_whiteout: unknown op"); 1588 } 1589} 1590 1591/* --------------------------------------------------------------------- */ 1592 1593/* 1594 * vnode operations vector used for files stored in a tmpfs file system. 1595 */ 1596struct vop_vector tmpfs_vnodeop_entries = { 1597 .vop_default = &default_vnodeops, 1598 .vop_lookup = vfs_cache_lookup, 1599 .vop_cachedlookup = tmpfs_lookup, 1600 .vop_create = tmpfs_create, 1601 .vop_mknod = tmpfs_mknod, 1602 .vop_open = tmpfs_open, 1603 .vop_close = tmpfs_close, 1604 .vop_access = tmpfs_access, 1605 .vop_getattr = tmpfs_getattr, 1606 .vop_setattr = tmpfs_setattr, 1607 .vop_read = tmpfs_read, 1608 .vop_write = tmpfs_write, 1609 .vop_fsync = tmpfs_fsync, 1610 .vop_remove = tmpfs_remove, 1611 .vop_link = tmpfs_link, 1612 .vop_rename = tmpfs_rename, 1613 .vop_mkdir = tmpfs_mkdir, 1614 .vop_rmdir = tmpfs_rmdir, 1615 .vop_symlink = tmpfs_symlink, 1616 .vop_readdir = tmpfs_readdir, 1617 .vop_readlink = tmpfs_readlink, 1618 .vop_inactive = tmpfs_inactive, 1619 .vop_reclaim = tmpfs_reclaim, 1620 .vop_print = tmpfs_print, 1621 .vop_pathconf = tmpfs_pathconf, 1622 .vop_vptofh = tmpfs_vptofh, 1623 .vop_whiteout = tmpfs_whiteout, 1624 .vop_bmap = VOP_EOPNOTSUPP, 1625}; 1626 1627