1 /*- 2 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 7 * 2005 program. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 37 #include <sys/kernel.h> 38 #include <sys/kern_syscall.h> 39 #include <sys/param.h> 40 #include <sys/fcntl.h> 41 #include <sys/lockf.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/resourcevar.h> 45 #include <sys/sched.h> 46 #include <sys/stat.h> 47 #include <sys/systm.h> 48 #include <sys/sysctl.h> 49 #include <sys/unistd.h> 50 #include <sys/vfsops.h> 51 #include <sys/vnode.h> 52 #include <sys/mountctl.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_extern.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_page.h> 58 #include <vm/vm_pageout.h> 59 #include <vm/vm_pager.h> 60 #include <vm/swap_pager.h> 61 62 #include <sys/buf2.h> 63 #include <vm/vm_page2.h> 64 65 #include <vfs/fifofs/fifo.h> 66 #include <vfs/tmpfs/tmpfs_vnops.h> 67 #include "tmpfs.h" 68 69 static void tmpfs_strategy_done(struct bio *bio); 70 static void tmpfs_move_pages(vm_object_t src, vm_object_t dst); 71 72 static int tmpfs_cluster_enable = 1; 73 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "TMPFS filesystem"); 74 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, cluster_enable, CTLFLAG_RW, 75 &tmpfs_cluster_enable, 0, ""); 76 77 static __inline 78 void 79 tmpfs_knote(struct vnode *vp, int flags) 80 { 81 if (flags) 82 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 83 } 84 85 86 /* --------------------------------------------------------------------- */ 87 88 static int 89 tmpfs_nresolve(struct vop_nresolve_args *ap) 90 { 91 struct vnode *dvp = ap->a_dvp; 92 struct vnode *vp = NULL; 93 struct namecache *ncp = ap->a_nch->ncp; 94 struct tmpfs_node *tnode; 95 struct tmpfs_dirent *de; 96 struct tmpfs_node *dnode; 97 int error; 98 99 dnode = VP_TO_TMPFS_DIR(dvp); 100 101 TMPFS_NODE_LOCK_SH(dnode); 102 loop: 103 de = tmpfs_dir_lookup(dnode, NULL, ncp); 104 if (de == NULL) { 105 error = ENOENT; 106 } else { 107 /* 108 * Allocate a vnode for the node we found. Use 109 * tmpfs_alloc_vp()'s deadlock handling mode. 110 */ 111 tnode = de->td_node; 112 error = tmpfs_alloc_vp(dvp->v_mount, dnode, tnode, 113 LK_EXCLUSIVE | LK_RETRY, &vp); 114 if (error == EAGAIN) 115 goto loop; 116 if (error) 117 goto out; 118 KKASSERT(vp); 119 } 120 121 out: 122 TMPFS_NODE_UNLOCK(dnode); 123 124 if ((dnode->tn_status & TMPFS_NODE_ACCESSED) == 0) { 125 TMPFS_NODE_LOCK(dnode); 126 dnode->tn_status |= TMPFS_NODE_ACCESSED; 127 TMPFS_NODE_UNLOCK(dnode); 128 } 129 130 /* 131 * Store the result of this lookup in the cache. Avoid this if the 132 * request was for creation, as it does not improve timings on 133 * emprical tests. 134 */ 135 if (vp) { 136 vn_unlock(vp); 137 cache_setvp(ap->a_nch, vp); 138 vrele(vp); 139 } else if (error == ENOENT) { 140 cache_setvp(ap->a_nch, NULL); 141 } 142 return (error); 143 } 144 145 static int 146 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 147 { 148 struct vnode *dvp = ap->a_dvp; 149 struct vnode **vpp = ap->a_vpp; 150 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); 151 struct ucred *cred = ap->a_cred; 152 int error; 153 154 *vpp = NULL; 155 156 /* Check accessibility of requested node as a first step. */ 157 error = VOP_ACCESS(dvp, VEXEC, cred); 158 if (error != 0) 159 return error; 160 161 if (dnode->tn_dir.tn_parent != NULL) { 162 /* Allocate a new vnode on the matching entry. */ 163 error = tmpfs_alloc_vp(dvp->v_mount, 164 NULL, dnode->tn_dir.tn_parent, 165 LK_EXCLUSIVE | LK_RETRY, vpp); 166 167 if (*vpp) 168 vn_unlock(*vpp); 169 } 170 return (*vpp == NULL) ? ENOENT : 0; 171 } 172 173 /* --------------------------------------------------------------------- */ 174 175 static int 176 tmpfs_ncreate(struct vop_ncreate_args *ap) 177 { 178 struct vnode *dvp = ap->a_dvp; 179 struct vnode **vpp = ap->a_vpp; 180 struct namecache *ncp = ap->a_nch->ncp; 181 struct vattr *vap = ap->a_vap; 182 struct ucred *cred = ap->a_cred; 183 int error; 184 185 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 186 187 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 188 if (error == 0) { 189 cache_setunresolved(ap->a_nch); 190 cache_setvp(ap->a_nch, *vpp); 191 tmpfs_knote(dvp, NOTE_WRITE); 192 } 193 return (error); 194 } 195 /* --------------------------------------------------------------------- */ 196 197 static int 198 tmpfs_nmknod(struct vop_nmknod_args *ap) 199 { 200 struct vnode *dvp = ap->a_dvp; 201 struct vnode **vpp = ap->a_vpp; 202 struct namecache *ncp = ap->a_nch->ncp; 203 struct vattr *vap = ap->a_vap; 204 struct ucred *cred = ap->a_cred; 205 int error; 206 207 if (vap->va_type != VBLK && vap->va_type != VCHR && 208 vap->va_type != VFIFO) { 209 return (EINVAL); 210 } 211 212 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 213 if (error == 0) { 214 cache_setunresolved(ap->a_nch); 215 cache_setvp(ap->a_nch, *vpp); 216 tmpfs_knote(dvp, NOTE_WRITE); 217 } 218 return error; 219 } 220 221 /* --------------------------------------------------------------------- */ 222 223 static int 224 tmpfs_open(struct vop_open_args *ap) 225 { 226 struct vnode *vp = ap->a_vp; 227 int mode = ap->a_mode; 228 struct tmpfs_node *node; 229 int error; 230 231 node = VP_TO_TMPFS_NODE(vp); 232 233 #if 0 234 /* The file is still active but all its names have been removed 235 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 236 * it is about to die. */ 237 if (node->tn_links < 1) 238 return (ENOENT); 239 #endif 240 241 /* If the file is marked append-only, deny write requests. */ 242 if ((node->tn_flags & APPEND) && 243 (mode & (FWRITE | O_APPEND)) == FWRITE) { 244 error = EPERM; 245 } else { 246 if (node->tn_reg.tn_pages_in_aobj) { 247 TMPFS_NODE_LOCK(node); 248 if (node->tn_reg.tn_pages_in_aobj) { 249 tmpfs_move_pages(node->tn_reg.tn_aobj, 250 vp->v_object); 251 node->tn_reg.tn_pages_in_aobj = 0; 252 } 253 TMPFS_NODE_UNLOCK(node); 254 } 255 error = vop_stdopen(ap); 256 } 257 258 return (error); 259 } 260 261 /* --------------------------------------------------------------------- */ 262 263 static int 264 tmpfs_close(struct vop_close_args *ap) 265 { 266 struct vnode *vp = ap->a_vp; 267 struct tmpfs_node *node; 268 int error; 269 270 node = VP_TO_TMPFS_NODE(vp); 271 272 if (node->tn_links > 0) { 273 /* 274 * Update node times. No need to do it if the node has 275 * been deleted, because it will vanish after we return. 276 */ 277 tmpfs_update(vp); 278 } 279 280 error = vop_stdclose(ap); 281 282 return (error); 283 } 284 285 /* --------------------------------------------------------------------- */ 286 287 int 288 tmpfs_access(struct vop_access_args *ap) 289 { 290 struct vnode *vp = ap->a_vp; 291 int error; 292 struct tmpfs_node *node; 293 294 node = VP_TO_TMPFS_NODE(vp); 295 296 switch (vp->v_type) { 297 case VDIR: 298 /* FALLTHROUGH */ 299 case VLNK: 300 /* FALLTHROUGH */ 301 case VREG: 302 if ((ap->a_mode & VWRITE) && 303 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 304 error = EROFS; 305 goto out; 306 } 307 break; 308 309 case VBLK: 310 /* FALLTHROUGH */ 311 case VCHR: 312 /* FALLTHROUGH */ 313 case VSOCK: 314 /* FALLTHROUGH */ 315 case VFIFO: 316 break; 317 318 default: 319 error = EINVAL; 320 goto out; 321 } 322 323 if ((ap->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 324 error = EPERM; 325 goto out; 326 } 327 328 error = vop_helper_access(ap, node->tn_uid, node->tn_gid, 329 node->tn_mode, 0); 330 out: 331 return error; 332 } 333 334 /* --------------------------------------------------------------------- */ 335 336 int 337 tmpfs_getattr(struct vop_getattr_args *ap) 338 { 339 struct vnode *vp = ap->a_vp; 340 struct vattr *vap = ap->a_vap; 341 struct tmpfs_node *node; 342 343 node = VP_TO_TMPFS_NODE(vp); 344 345 tmpfs_update(vp); 346 347 TMPFS_NODE_LOCK_SH(node); 348 vap->va_type = vp->v_type; 349 vap->va_mode = node->tn_mode; 350 vap->va_nlink = node->tn_links; 351 vap->va_uid = node->tn_uid; 352 vap->va_gid = node->tn_gid; 353 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 354 vap->va_fileid = node->tn_id; 355 vap->va_size = node->tn_size; 356 vap->va_blocksize = PAGE_SIZE; 357 vap->va_atime.tv_sec = node->tn_atime; 358 vap->va_atime.tv_nsec = node->tn_atimensec; 359 vap->va_mtime.tv_sec = node->tn_mtime; 360 vap->va_mtime.tv_nsec = node->tn_mtimensec; 361 vap->va_ctime.tv_sec = node->tn_ctime; 362 vap->va_ctime.tv_nsec = node->tn_ctimensec; 363 vap->va_gen = node->tn_gen; 364 vap->va_flags = node->tn_flags; 365 if (vp->v_type == VBLK || vp->v_type == VCHR) { 366 vap->va_rmajor = umajor(node->tn_rdev); 367 vap->va_rminor = uminor(node->tn_rdev); 368 } 369 vap->va_bytes = round_page(node->tn_size); 370 vap->va_filerev = 0; 371 TMPFS_NODE_UNLOCK(node); 372 373 return 0; 374 } 375 376 /* --------------------------------------------------------------------- */ 377 378 int 379 tmpfs_setattr(struct vop_setattr_args *ap) 380 { 381 struct vnode *vp = ap->a_vp; 382 struct vattr *vap = ap->a_vap; 383 struct ucred *cred = ap->a_cred; 384 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 385 int error = 0; 386 int kflags = 0; 387 388 TMPFS_NODE_LOCK(node); 389 if (error == 0 && (vap->va_flags != VNOVAL)) { 390 error = tmpfs_chflags(vp, vap->va_flags, cred); 391 kflags |= NOTE_ATTRIB; 392 } 393 394 if (error == 0 && (vap->va_size != VNOVAL)) { 395 /* restore any saved pages before proceeding */ 396 if (node->tn_reg.tn_pages_in_aobj) { 397 tmpfs_move_pages(node->tn_reg.tn_aobj, vp->v_object); 398 node->tn_reg.tn_pages_in_aobj = 0; 399 } 400 if (vap->va_size > node->tn_size) 401 kflags |= NOTE_WRITE | NOTE_EXTEND; 402 else 403 kflags |= NOTE_WRITE; 404 error = tmpfs_chsize(vp, vap->va_size, cred); 405 } 406 407 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 408 vap->va_gid != (gid_t)VNOVAL)) { 409 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 410 kflags |= NOTE_ATTRIB; 411 } 412 413 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 414 error = tmpfs_chmod(vp, vap->va_mode, cred); 415 kflags |= NOTE_ATTRIB; 416 } 417 418 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 419 vap->va_atime.tv_nsec != VNOVAL) || 420 (vap->va_mtime.tv_sec != VNOVAL && 421 vap->va_mtime.tv_nsec != VNOVAL) )) { 422 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 423 vap->va_vaflags, cred); 424 kflags |= NOTE_ATTRIB; 425 } 426 427 /* 428 * Update the node times. We give preference to the error codes 429 * generated by this function rather than the ones that may arise 430 * from tmpfs_update. 431 */ 432 tmpfs_update(vp); 433 TMPFS_NODE_UNLOCK(node); 434 tmpfs_knote(vp, kflags); 435 436 return (error); 437 } 438 439 /* --------------------------------------------------------------------- */ 440 441 /* 442 * fsync is usually a NOP, but we must take action when unmounting or 443 * when recycling. 444 */ 445 static int 446 tmpfs_fsync(struct vop_fsync_args *ap) 447 { 448 struct tmpfs_node *node; 449 struct vnode *vp = ap->a_vp; 450 451 node = VP_TO_TMPFS_NODE(vp); 452 453 /* 454 * tmpfs vnodes typically remain dirty, avoid long syncer scans 455 * by forcing removal from the syncer list. 456 */ 457 vn_syncer_remove(vp, 1); 458 459 tmpfs_update(vp); 460 if (vp->v_type == VREG) { 461 if (vp->v_flag & VRECLAIMED) { 462 if (node->tn_links == 0) 463 tmpfs_truncate(vp, 0); 464 else 465 vfsync(ap->a_vp, ap->a_waitfor, 1, NULL, NULL); 466 } 467 } 468 469 return 0; 470 } 471 472 /* --------------------------------------------------------------------- */ 473 474 static int 475 tmpfs_read(struct vop_read_args *ap) 476 { 477 struct buf *bp; 478 struct vnode *vp = ap->a_vp; 479 struct uio *uio = ap->a_uio; 480 struct tmpfs_node *node; 481 off_t base_offset; 482 size_t offset; 483 size_t len; 484 size_t resid; 485 int error; 486 int seqcount; 487 488 /* 489 * Check the basics 490 */ 491 if (uio->uio_offset < 0) 492 return (EINVAL); 493 if (vp->v_type != VREG) 494 return (EINVAL); 495 496 /* 497 * Extract node, try to shortcut the operation through 498 * the VM page cache, allowing us to avoid buffer cache 499 * overheads. 500 */ 501 node = VP_TO_TMPFS_NODE(vp); 502 resid = uio->uio_resid; 503 seqcount = ap->a_ioflag >> 16; 504 error = vop_helper_read_shortcut(ap); 505 if (error) 506 return error; 507 if (uio->uio_resid == 0) { 508 if (resid) 509 goto finished; 510 return error; 511 } 512 513 /* 514 * restore any saved pages before proceeding 515 */ 516 if (node->tn_reg.tn_pages_in_aobj) { 517 TMPFS_NODE_LOCK(node); 518 if (node->tn_reg.tn_pages_in_aobj) { 519 tmpfs_move_pages(node->tn_reg.tn_aobj, vp->v_object); 520 node->tn_reg.tn_pages_in_aobj = 0; 521 } 522 TMPFS_NODE_UNLOCK(node); 523 } 524 525 /* 526 * Fall-through to our normal read code. 527 */ 528 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 529 /* 530 * Use buffer cache I/O (via tmpfs_strategy) 531 */ 532 offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64; 533 base_offset = (off_t)uio->uio_offset - offset; 534 bp = getcacheblk(vp, base_offset, TMPFS_BLKSIZE, GETBLK_KVABIO); 535 if (bp == NULL) { 536 if (tmpfs_cluster_enable) { 537 error = cluster_readx(vp, node->tn_size, 538 base_offset, 539 TMPFS_BLKSIZE, 540 B_NOTMETA | B_KVABIO, 541 uio->uio_resid, 542 seqcount * MAXBSIZE, 543 &bp); 544 } else { 545 error = bread_kvabio(vp, base_offset, 546 TMPFS_BLKSIZE, &bp); 547 } 548 if (error) { 549 brelse(bp); 550 kprintf("tmpfs_read bread error %d\n", error); 551 break; 552 } 553 554 /* 555 * tmpfs pretty much fiddles directly with the VM 556 * system, don't let it exhaust it or we won't play 557 * nice with other processes. 558 * 559 * Only do this if the VOP is coming from a normal 560 * read/write. The VM system handles the case for 561 * UIO_NOCOPY. 562 */ 563 if (uio->uio_segflg != UIO_NOCOPY) 564 vm_wait_nominal(); 565 } 566 bp->b_flags |= B_CLUSTEROK; 567 bkvasync(bp); 568 569 /* 570 * Figure out how many bytes we can actually copy this loop. 571 */ 572 len = TMPFS_BLKSIZE - offset; 573 if (len > uio->uio_resid) 574 len = uio->uio_resid; 575 if (len > node->tn_size - uio->uio_offset) 576 len = (size_t)(node->tn_size - uio->uio_offset); 577 578 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 579 bqrelse(bp); 580 if (error) { 581 kprintf("tmpfs_read uiomove error %d\n", error); 582 break; 583 } 584 } 585 586 finished: 587 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { 588 TMPFS_NODE_LOCK(node); 589 node->tn_status |= TMPFS_NODE_ACCESSED; 590 TMPFS_NODE_UNLOCK(node); 591 } 592 return (error); 593 } 594 595 static int 596 tmpfs_write(struct vop_write_args *ap) 597 { 598 struct buf *bp; 599 struct vnode *vp = ap->a_vp; 600 struct uio *uio = ap->a_uio; 601 struct thread *td = uio->uio_td; 602 struct tmpfs_node *node; 603 boolean_t extended; 604 off_t oldsize; 605 int error; 606 off_t base_offset; 607 size_t offset; 608 size_t len; 609 struct rlimit limit; 610 int trivial = 0; 611 int kflags = 0; 612 int seqcount; 613 614 error = 0; 615 if (uio->uio_resid == 0) { 616 return error; 617 } 618 619 node = VP_TO_TMPFS_NODE(vp); 620 621 if (vp->v_type != VREG) 622 return (EINVAL); 623 seqcount = ap->a_ioflag >> 16; 624 625 TMPFS_NODE_LOCK(node); 626 627 /* 628 * restore any saved pages before proceeding 629 */ 630 if (node->tn_reg.tn_pages_in_aobj) { 631 tmpfs_move_pages(node->tn_reg.tn_aobj, vp->v_object); 632 node->tn_reg.tn_pages_in_aobj = 0; 633 } 634 635 oldsize = node->tn_size; 636 if (ap->a_ioflag & IO_APPEND) 637 uio->uio_offset = node->tn_size; 638 639 /* 640 * Check for illegal write offsets. 641 */ 642 if (uio->uio_offset + uio->uio_resid > 643 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 644 error = EFBIG; 645 goto done; 646 } 647 648 /* 649 * NOTE: Ignore if UIO does not come from a user thread (e.g. VN). 650 */ 651 if (vp->v_type == VREG && td != NULL && td->td_lwp != NULL) { 652 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 653 if (error) 654 goto done; 655 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 656 ksignal(td->td_proc, SIGXFSZ); 657 error = EFBIG; 658 goto done; 659 } 660 } 661 662 /* 663 * Extend the file's size if necessary 664 */ 665 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 666 667 while (uio->uio_resid > 0) { 668 /* 669 * Don't completely blow out running buffer I/O 670 * when being hit from the pageout daemon. 671 */ 672 if (uio->uio_segflg == UIO_NOCOPY && 673 (ap->a_ioflag & IO_RECURSE) == 0) { 674 bwillwrite(TMPFS_BLKSIZE); 675 } 676 677 /* 678 * Use buffer cache I/O (via tmpfs_strategy) 679 */ 680 offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64; 681 base_offset = (off_t)uio->uio_offset - offset; 682 len = TMPFS_BLKSIZE - offset; 683 if (len > uio->uio_resid) 684 len = uio->uio_resid; 685 686 if ((uio->uio_offset + len) > node->tn_size) { 687 trivial = (uio->uio_offset <= node->tn_size); 688 error = tmpfs_reg_resize(vp, uio->uio_offset + len, 689 trivial); 690 if (error) 691 break; 692 } 693 694 /* 695 * Read to fill in any gaps. Theoretically we could 696 * optimize this if the write covers the entire buffer 697 * and is not a UIO_NOCOPY write, however this can lead 698 * to a security violation exposing random kernel memory 699 * (whatever junk was in the backing VM pages before). 700 * 701 * So just use bread() to do the right thing. 702 */ 703 error = bread_kvabio(vp, base_offset, TMPFS_BLKSIZE, &bp); 704 bkvasync(bp); 705 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 706 if (error) { 707 kprintf("tmpfs_write uiomove error %d\n", error); 708 brelse(bp); 709 break; 710 } 711 712 if (uio->uio_offset > node->tn_size) { 713 node->tn_size = uio->uio_offset; 714 kflags |= NOTE_EXTEND; 715 } 716 kflags |= NOTE_WRITE; 717 718 /* 719 * Always try to flush the page in the UIO_NOCOPY case. This 720 * can come from the pageout daemon or during vnode eviction. 721 * It is not necessarily going to be marked IO_ASYNC/IO_SYNC. 722 * 723 * For the normal case we buwrite(), dirtying the underlying 724 * VM pages instead of dirtying the buffer and releasing the 725 * buffer as a clean buffer. This allows tmpfs to use 726 * essentially all available memory to cache file data. 727 * If we used bdwrite() the buffer cache would wind up 728 * flushing the data to swap too quickly. 729 * 730 * But because tmpfs can seriously load the VM system we 731 * fall-back to using bdwrite() when free memory starts 732 * to get low. This shifts the load away from the VM system 733 * and makes tmpfs act more like a normal filesystem with 734 * regards to disk activity. 735 * 736 * tmpfs pretty much fiddles directly with the VM 737 * system, don't let it exhaust it or we won't play 738 * nice with other processes. Only do this if the 739 * VOP is coming from a normal read/write. The VM system 740 * handles the case for UIO_NOCOPY. 741 */ 742 bp->b_flags |= B_CLUSTEROK; 743 if (uio->uio_segflg == UIO_NOCOPY) { 744 /* 745 * Flush from the pageout daemon, deal with 746 * potentially very heavy tmpfs write activity 747 * causing long stalls in the pageout daemon 748 * before pages get to free/cache. 749 * 750 * (a) Under severe pressure setting B_DIRECT will 751 * cause a buffer release to try to free the 752 * underlying pages. 753 * 754 * (b) Under modest memory pressure the B_RELBUF 755 * alone is sufficient to get the pages moved 756 * to the cache. We could also force this by 757 * setting B_NOTMETA but that might have other 758 * unintended side-effects (e.g. setting 759 * PG_NOTMETA on the VM page). 760 * 761 * Hopefully this will unblock the VM system more 762 * quickly under extreme tmpfs write load. 763 */ 764 if (vm_page_count_min(vm_page_free_hysteresis)) 765 bp->b_flags |= B_DIRECT; 766 bp->b_flags |= B_AGE | B_RELBUF; 767 bp->b_act_count = 0; /* buffer->deactivate pgs */ 768 cluster_awrite(bp); 769 } else if (vm_page_count_target()) { 770 /* 771 * Normal (userland) write but we are low on memory, 772 * run the buffer the buffer cache. 773 */ 774 bp->b_act_count = 0; /* buffer->deactivate pgs */ 775 bdwrite(bp); 776 } else { 777 /* 778 * Otherwise run the buffer directly through to the 779 * backing VM store. 780 */ 781 buwrite(bp); 782 /*vm_wait_nominal();*/ 783 } 784 785 if (bp->b_error) { 786 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 787 break; 788 } 789 } 790 791 if (error) { 792 if (extended) { 793 (void)tmpfs_reg_resize(vp, oldsize, trivial); 794 kflags &= ~NOTE_EXTEND; 795 } 796 goto done; 797 } 798 799 /* 800 * Currently we don't set the mtime on files modified via mmap() 801 * because we can't tell the difference between those modifications 802 * and an attempt by the pageout daemon to flush tmpfs pages to 803 * swap. 804 * 805 * This is because in order to defer flushes as long as possible 806 * buwrite() works by marking the underlying VM pages dirty in 807 * order to be able to dispose of the buffer cache buffer without 808 * flushing it. 809 */ 810 if (uio->uio_segflg == UIO_NOCOPY) { 811 if (vp->v_flag & VLASTWRITETS) { 812 node->tn_mtime = vp->v_lastwrite_ts.tv_sec; 813 node->tn_mtimensec = vp->v_lastwrite_ts.tv_nsec; 814 } 815 } else { 816 node->tn_status |= TMPFS_NODE_MODIFIED; 817 vclrflags(vp, VLASTWRITETS); 818 } 819 820 if (extended) 821 node->tn_status |= TMPFS_NODE_CHANGED; 822 823 if (node->tn_mode & (S_ISUID | S_ISGID)) { 824 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 825 node->tn_mode &= ~(S_ISUID | S_ISGID); 826 } 827 done: 828 TMPFS_NODE_UNLOCK(node); 829 if (kflags) 830 tmpfs_knote(vp, kflags); 831 832 return(error); 833 } 834 835 static int 836 tmpfs_advlock(struct vop_advlock_args *ap) 837 { 838 struct tmpfs_node *node; 839 struct vnode *vp = ap->a_vp; 840 int error; 841 842 node = VP_TO_TMPFS_NODE(vp); 843 error = (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 844 845 return (error); 846 } 847 848 /* 849 * The strategy function is typically only called when memory pressure 850 * forces the system to attempt to pageout pages. It can also be called 851 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write 852 * operations 853 * 854 * We set VKVABIO for VREG files so bp->b_data may not be synchronized to 855 * our cpu. swap_pager_strategy() is all we really use, and it directly 856 * supports this. 857 */ 858 static int 859 tmpfs_strategy(struct vop_strategy_args *ap) 860 { 861 struct bio *bio = ap->a_bio; 862 struct bio *nbio; 863 struct buf *bp = bio->bio_buf; 864 struct vnode *vp = ap->a_vp; 865 struct tmpfs_node *node; 866 vm_object_t uobj; 867 vm_page_t m; 868 int i; 869 870 if (vp->v_type != VREG) { 871 bp->b_resid = bp->b_bcount; 872 bp->b_flags |= B_ERROR | B_INVAL; 873 bp->b_error = EINVAL; 874 biodone(bio); 875 return(0); 876 } 877 878 node = VP_TO_TMPFS_NODE(vp); 879 880 uobj = node->tn_reg.tn_aobj; 881 882 /* 883 * Don't bother flushing to swap if there is no swap, just 884 * ensure that the pages are marked as needing a commit (still). 885 */ 886 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { 887 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 888 m = bp->b_xio.xio_pages[i]; 889 vm_page_need_commit(m); 890 } 891 bp->b_resid = 0; 892 bp->b_error = 0; 893 biodone(bio); 894 } else { 895 nbio = push_bio(bio); 896 nbio->bio_done = tmpfs_strategy_done; 897 nbio->bio_offset = bio->bio_offset; 898 swap_pager_strategy(uobj, nbio); 899 } 900 return 0; 901 } 902 903 /* 904 * If we were unable to commit the pages to swap make sure they are marked 905 * as needing a commit (again). If we were, clear the flag to allow the 906 * pages to be freed. 907 * 908 * Do not error-out the buffer. In particular, vinvalbuf() needs to 909 * always work. 910 */ 911 static void 912 tmpfs_strategy_done(struct bio *bio) 913 { 914 struct buf *bp; 915 vm_page_t m; 916 int i; 917 918 bp = bio->bio_buf; 919 920 if (bp->b_flags & B_ERROR) { 921 bp->b_flags &= ~B_ERROR; 922 bp->b_error = 0; 923 bp->b_resid = 0; 924 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 925 m = bp->b_xio.xio_pages[i]; 926 vm_page_need_commit(m); 927 } 928 } else { 929 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 930 m = bp->b_xio.xio_pages[i]; 931 vm_page_clear_commit(m); 932 } 933 } 934 bio = pop_bio(bio); 935 biodone(bio); 936 } 937 938 static int 939 tmpfs_bmap(struct vop_bmap_args *ap) 940 { 941 if (ap->a_doffsetp != NULL) 942 *ap->a_doffsetp = ap->a_loffset; 943 if (ap->a_runp != NULL) 944 *ap->a_runp = 0; 945 if (ap->a_runb != NULL) 946 *ap->a_runb = 0; 947 948 return 0; 949 } 950 951 /* --------------------------------------------------------------------- */ 952 953 static int 954 tmpfs_nremove(struct vop_nremove_args *ap) 955 { 956 struct vnode *dvp = ap->a_dvp; 957 struct namecache *ncp = ap->a_nch->ncp; 958 struct vnode *vp; 959 int error; 960 struct tmpfs_dirent *de; 961 struct tmpfs_mount *tmp; 962 struct tmpfs_node *dnode; 963 struct tmpfs_node *node; 964 965 /* 966 * We have to acquire the vp from ap->a_nch because we will likely 967 * unresolve the namecache entry, and a vrele/vput is needed to 968 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 969 * 970 * We have to use vget to clear any inactive state on the vnode, 971 * otherwise the vnode may remain inactive and thus tmpfs_inactive 972 * will not get called when we release it. 973 */ 974 error = cache_vget(ap->a_nch, ap->a_cred, LK_SHARED, &vp); 975 KKASSERT(vp->v_mount == dvp->v_mount); 976 KKASSERT(error == 0); 977 vn_unlock(vp); 978 979 if (vp->v_type == VDIR) { 980 error = EISDIR; 981 goto out2; 982 } 983 984 dnode = VP_TO_TMPFS_DIR(dvp); 985 node = VP_TO_TMPFS_NODE(vp); 986 tmp = VFS_TO_TMPFS(vp->v_mount); 987 988 TMPFS_NODE_LOCK(dnode); 989 de = tmpfs_dir_lookup(dnode, node, ncp); 990 if (de == NULL) { 991 error = ENOENT; 992 TMPFS_NODE_UNLOCK(dnode); 993 goto out; 994 } 995 996 /* Files marked as immutable or append-only cannot be deleted. */ 997 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 998 (dnode->tn_flags & APPEND)) { 999 error = EPERM; 1000 TMPFS_NODE_UNLOCK(dnode); 1001 goto out; 1002 } 1003 1004 /* Remove the entry from the directory; as it is a file, we do not 1005 * have to change the number of hard links of the directory. */ 1006 tmpfs_dir_detach(dnode, de); 1007 TMPFS_NODE_UNLOCK(dnode); 1008 1009 /* Free the directory entry we just deleted. Note that the node 1010 * referred by it will not be removed until the vnode is really 1011 * reclaimed. */ 1012 tmpfs_free_dirent(tmp, de); 1013 1014 if (node->tn_links > 0) { 1015 TMPFS_NODE_LOCK(node); 1016 node->tn_status |= TMPFS_NODE_CHANGED; 1017 TMPFS_NODE_UNLOCK(node); 1018 } 1019 1020 cache_unlink(ap->a_nch); 1021 tmpfs_knote(vp, NOTE_DELETE); 1022 error = 0; 1023 1024 out: 1025 if (error == 0) 1026 tmpfs_knote(dvp, NOTE_WRITE); 1027 out2: 1028 vrele(vp); 1029 1030 return error; 1031 } 1032 1033 /* --------------------------------------------------------------------- */ 1034 1035 static int 1036 tmpfs_nlink(struct vop_nlink_args *ap) 1037 { 1038 struct vnode *dvp = ap->a_dvp; 1039 struct vnode *vp = ap->a_vp; 1040 struct namecache *ncp = ap->a_nch->ncp; 1041 struct tmpfs_dirent *de; 1042 struct tmpfs_node *node; 1043 struct tmpfs_node *dnode; 1044 int error; 1045 1046 KKASSERT(dvp != vp); /* XXX When can this be false? */ 1047 1048 node = VP_TO_TMPFS_NODE(vp); 1049 dnode = VP_TO_TMPFS_NODE(dvp); 1050 TMPFS_NODE_LOCK(dnode); 1051 1052 /* XXX: Why aren't the following two tests done by the caller? */ 1053 1054 /* Hard links of directories are forbidden. */ 1055 if (vp->v_type == VDIR) { 1056 error = EPERM; 1057 goto out; 1058 } 1059 1060 /* Cannot create cross-device links. */ 1061 if (dvp->v_mount != vp->v_mount) { 1062 error = EXDEV; 1063 goto out; 1064 } 1065 1066 /* Ensure that we do not overflow the maximum number of links imposed 1067 * by the system. */ 1068 KKASSERT(node->tn_links <= LINK_MAX); 1069 if (node->tn_links >= LINK_MAX) { 1070 error = EMLINK; 1071 goto out; 1072 } 1073 1074 /* We cannot create links of files marked immutable or append-only. */ 1075 if (node->tn_flags & (IMMUTABLE | APPEND)) { 1076 error = EPERM; 1077 goto out; 1078 } 1079 1080 /* Allocate a new directory entry to represent the node. */ 1081 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 1082 ncp->nc_name, ncp->nc_nlen, &de); 1083 if (error != 0) 1084 goto out; 1085 1086 /* Insert the new directory entry into the appropriate directory. */ 1087 tmpfs_dir_attach(dnode, de); 1088 1089 /* vp link count has changed, so update node times. */ 1090 1091 TMPFS_NODE_LOCK(node); 1092 node->tn_status |= TMPFS_NODE_CHANGED; 1093 TMPFS_NODE_UNLOCK(node); 1094 tmpfs_update(vp); 1095 1096 tmpfs_knote(vp, NOTE_LINK); 1097 cache_setunresolved(ap->a_nch); 1098 cache_setvp(ap->a_nch, vp); 1099 error = 0; 1100 1101 out: 1102 TMPFS_NODE_UNLOCK(dnode); 1103 if (error == 0) 1104 tmpfs_knote(dvp, NOTE_WRITE); 1105 return error; 1106 } 1107 1108 /* --------------------------------------------------------------------- */ 1109 1110 static int 1111 tmpfs_nrename(struct vop_nrename_args *ap) 1112 { 1113 struct vnode *fdvp = ap->a_fdvp; 1114 struct namecache *fncp = ap->a_fnch->ncp; 1115 struct vnode *fvp = fncp->nc_vp; 1116 struct vnode *tdvp = ap->a_tdvp; 1117 struct namecache *tncp = ap->a_tnch->ncp; 1118 struct vnode *tvp; 1119 struct tmpfs_dirent *de, *tde; 1120 struct tmpfs_mount *tmp; 1121 struct tmpfs_node *fdnode; 1122 struct tmpfs_node *fnode; 1123 struct tmpfs_node *tnode; 1124 struct tmpfs_node *tdnode; 1125 char *newname; 1126 char *oldname; 1127 int error; 1128 1129 KKASSERT(fdvp->v_mount == fvp->v_mount); 1130 1131 /* 1132 * Because tvp can get overwritten we have to vget it instead of 1133 * just vref or use it, otherwise it's VINACTIVE flag may not get 1134 * cleared and the node won't get destroyed. 1135 */ 1136 error = cache_vget(ap->a_tnch, ap->a_cred, LK_SHARED, &tvp); 1137 if (error == 0) { 1138 tnode = VP_TO_TMPFS_NODE(tvp); 1139 vn_unlock(tvp); 1140 } else { 1141 tnode = NULL; 1142 } 1143 1144 /* Disallow cross-device renames. 1145 * XXX Why isn't this done by the caller? */ 1146 if (fvp->v_mount != tdvp->v_mount || 1147 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1148 error = EXDEV; 1149 goto out; 1150 } 1151 1152 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1153 tdnode = VP_TO_TMPFS_DIR(tdvp); 1154 1155 /* If source and target are the same file, there is nothing to do. */ 1156 if (fvp == tvp) { 1157 error = 0; 1158 goto out; 1159 } 1160 1161 fdnode = VP_TO_TMPFS_DIR(fdvp); 1162 fnode = VP_TO_TMPFS_NODE(fvp); 1163 TMPFS_NODE_LOCK(fdnode); 1164 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 1165 TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */ 1166 1167 /* Avoid manipulating '.' and '..' entries. */ 1168 if (de == NULL) { 1169 error = ENOENT; 1170 goto out_locked; 1171 } 1172 KKASSERT(de->td_node == fnode); 1173 1174 /* 1175 * If replacing an entry in the target directory and that entry 1176 * is a directory, it must be empty. 1177 * 1178 * Kern_rename gurantees the destination to be a directory 1179 * if the source is one (it does?). 1180 */ 1181 if (tvp != NULL) { 1182 KKASSERT(tnode != NULL); 1183 1184 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1185 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1186 error = EPERM; 1187 goto out_locked; 1188 } 1189 1190 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1191 if (tnode->tn_size > 0) { 1192 error = ENOTEMPTY; 1193 goto out_locked; 1194 } 1195 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1196 error = ENOTDIR; 1197 goto out_locked; 1198 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1199 error = EISDIR; 1200 goto out_locked; 1201 } else { 1202 KKASSERT(fnode->tn_type != VDIR && 1203 tnode->tn_type != VDIR); 1204 } 1205 } 1206 1207 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1208 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1209 error = EPERM; 1210 goto out_locked; 1211 } 1212 1213 /* 1214 * Ensure that we have enough memory to hold the new name, if it 1215 * has to be changed. 1216 */ 1217 if (fncp->nc_nlen != tncp->nc_nlen || 1218 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 1219 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 1220 M_WAITOK | M_NULLOK); 1221 if (newname == NULL) { 1222 error = ENOSPC; 1223 goto out_locked; 1224 } 1225 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 1226 newname[tncp->nc_nlen] = '\0'; 1227 } else { 1228 newname = NULL; 1229 } 1230 1231 /* 1232 * Unlink entry from source directory. Note that the kernel has 1233 * already checked for illegal recursion cases (renaming a directory 1234 * into a subdirectory of itself). 1235 */ 1236 if (fdnode != tdnode) { 1237 tmpfs_dir_detach(fdnode, de); 1238 } else { 1239 /* XXX depend on namecache lock */ 1240 TMPFS_NODE_LOCK(fdnode); 1241 KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp)); 1242 RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de); 1243 RB_REMOVE(tmpfs_dirtree_cookie, 1244 &fdnode->tn_dir.tn_cookietree, de); 1245 TMPFS_NODE_UNLOCK(fdnode); 1246 } 1247 1248 /* 1249 * Handle any name change. Swap with newname, we will 1250 * deallocate it at the end. 1251 */ 1252 if (newname != NULL) { 1253 #if 0 1254 TMPFS_NODE_LOCK(fnode); 1255 fnode->tn_status |= TMPFS_NODE_CHANGED; 1256 TMPFS_NODE_UNLOCK(fnode); 1257 #endif 1258 oldname = de->td_name; 1259 de->td_name = newname; 1260 de->td_namelen = (uint16_t)tncp->nc_nlen; 1261 newname = oldname; 1262 } 1263 1264 /* 1265 * If we are overwriting an entry, we have to remove the old one 1266 * from the target directory. 1267 */ 1268 if (tvp != NULL) { 1269 /* Remove the old entry from the target directory. */ 1270 TMPFS_NODE_LOCK(tdnode); 1271 tde = tmpfs_dir_lookup(tdnode, tnode, tncp); 1272 tmpfs_dir_detach(tdnode, tde); 1273 TMPFS_NODE_UNLOCK(tdnode); 1274 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1275 1276 /* 1277 * Free the directory entry we just deleted. Note that the 1278 * node referred by it will not be removed until the vnode is 1279 * really reclaimed. 1280 */ 1281 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1282 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1283 } 1284 1285 /* 1286 * Link entry to target directory. If the entry 1287 * represents a directory move the parent linkage 1288 * as well. 1289 */ 1290 if (fdnode != tdnode) { 1291 if (de->td_node->tn_type == VDIR) { 1292 TMPFS_VALIDATE_DIR(fnode); 1293 } 1294 tmpfs_dir_attach(tdnode, de); 1295 } else { 1296 TMPFS_NODE_LOCK(tdnode); 1297 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1298 RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de); 1299 RB_INSERT(tmpfs_dirtree_cookie, 1300 &tdnode->tn_dir.tn_cookietree, de); 1301 TMPFS_NODE_UNLOCK(tdnode); 1302 } 1303 1304 /* 1305 * Finish up 1306 */ 1307 if (newname) { 1308 kfree(newname, tmp->tm_name_zone); 1309 newname = NULL; 1310 } 1311 cache_rename(ap->a_fnch, ap->a_tnch); 1312 tmpfs_knote(ap->a_fdvp, NOTE_WRITE); 1313 tmpfs_knote(ap->a_tdvp, NOTE_WRITE); 1314 if (fnode->tn_vnode) 1315 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1316 error = 0; 1317 1318 out_locked: 1319 ; 1320 out: 1321 if (tvp) 1322 vrele(tvp); 1323 return error; 1324 } 1325 1326 /* --------------------------------------------------------------------- */ 1327 1328 static int 1329 tmpfs_nmkdir(struct vop_nmkdir_args *ap) 1330 { 1331 struct vnode *dvp = ap->a_dvp; 1332 struct vnode **vpp = ap->a_vpp; 1333 struct namecache *ncp = ap->a_nch->ncp; 1334 struct vattr *vap = ap->a_vap; 1335 struct ucred *cred = ap->a_cred; 1336 int error; 1337 1338 KKASSERT(vap->va_type == VDIR); 1339 1340 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1341 if (error == 0) { 1342 cache_setunresolved(ap->a_nch); 1343 cache_setvp(ap->a_nch, *vpp); 1344 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1345 } 1346 return error; 1347 } 1348 1349 /* --------------------------------------------------------------------- */ 1350 1351 static int 1352 tmpfs_nrmdir(struct vop_nrmdir_args *ap) 1353 { 1354 struct vnode *dvp = ap->a_dvp; 1355 struct namecache *ncp = ap->a_nch->ncp; 1356 struct vnode *vp; 1357 struct tmpfs_dirent *de; 1358 struct tmpfs_mount *tmp; 1359 struct tmpfs_node *dnode; 1360 struct tmpfs_node *node; 1361 int error; 1362 1363 /* 1364 * We have to acquire the vp from ap->a_nch because we will likely 1365 * unresolve the namecache entry, and a vrele/vput is needed to 1366 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 1367 * 1368 * We have to use vget to clear any inactive state on the vnode, 1369 * otherwise the vnode may remain inactive and thus tmpfs_inactive 1370 * will not get called when we release it. 1371 */ 1372 error = cache_vget(ap->a_nch, ap->a_cred, LK_SHARED, &vp); 1373 KKASSERT(error == 0); 1374 vn_unlock(vp); 1375 1376 /* 1377 * Prevalidate so we don't hit an assertion later 1378 */ 1379 if (vp->v_type != VDIR) { 1380 error = ENOTDIR; 1381 goto out; 1382 } 1383 1384 tmp = VFS_TO_TMPFS(dvp->v_mount); 1385 dnode = VP_TO_TMPFS_DIR(dvp); 1386 node = VP_TO_TMPFS_DIR(vp); 1387 1388 /* 1389 * Directories with more than two entries ('.' and '..') cannot 1390 * be removed. 1391 */ 1392 if (node->tn_size > 0) { 1393 error = ENOTEMPTY; 1394 goto out; 1395 } 1396 1397 if ((dnode->tn_flags & APPEND) 1398 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1399 error = EPERM; 1400 goto out; 1401 } 1402 1403 /* 1404 * This invariant holds only if we are not trying to 1405 * remove "..". We checked for that above so this is safe now. 1406 */ 1407 KKASSERT(node->tn_dir.tn_parent == dnode); 1408 1409 /* 1410 * Get the directory entry associated with node (vp). This 1411 * was filled by tmpfs_lookup while looking up the entry. 1412 */ 1413 TMPFS_NODE_LOCK(dnode); 1414 de = tmpfs_dir_lookup(dnode, node, ncp); 1415 KKASSERT(TMPFS_DIRENT_MATCHES(de, ncp->nc_name, ncp->nc_nlen)); 1416 1417 /* Check flags to see if we are allowed to remove the directory. */ 1418 if ((dnode->tn_flags & APPEND) || 1419 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1420 error = EPERM; 1421 TMPFS_NODE_UNLOCK(dnode); 1422 goto out; 1423 } 1424 1425 /* Detach the directory entry from the directory (dnode). */ 1426 tmpfs_dir_detach(dnode, de); 1427 TMPFS_NODE_UNLOCK(dnode); 1428 1429 /* No vnode should be allocated for this entry from this point */ 1430 TMPFS_NODE_LOCK(dnode); 1431 TMPFS_ASSERT_ELOCKED(dnode); 1432 TMPFS_NODE_LOCK(node); 1433 TMPFS_ASSERT_ELOCKED(node); 1434 1435 /* 1436 * Must set parent linkage to NULL (tested by ncreate to disallow 1437 * the creation of new files/dirs in a deleted directory) 1438 */ 1439 node->tn_status |= TMPFS_NODE_CHANGED; 1440 1441 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1442 TMPFS_NODE_MODIFIED; 1443 1444 TMPFS_NODE_UNLOCK(node); 1445 TMPFS_NODE_UNLOCK(dnode); 1446 1447 /* Free the directory entry we just deleted. Note that the node 1448 * referred by it will not be removed until the vnode is really 1449 * reclaimed. */ 1450 tmpfs_free_dirent(tmp, de); 1451 1452 /* Release the deleted vnode (will destroy the node, notify 1453 * interested parties and clean it from the cache). */ 1454 1455 TMPFS_NODE_LOCK(dnode); 1456 dnode->tn_status |= TMPFS_NODE_CHANGED; 1457 TMPFS_NODE_UNLOCK(dnode); 1458 tmpfs_update(dvp); 1459 1460 cache_unlink(ap->a_nch); 1461 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1462 error = 0; 1463 1464 out: 1465 vrele(vp); 1466 1467 return error; 1468 } 1469 1470 /* --------------------------------------------------------------------- */ 1471 1472 static int 1473 tmpfs_nsymlink(struct vop_nsymlink_args *ap) 1474 { 1475 struct vnode *dvp = ap->a_dvp; 1476 struct vnode **vpp = ap->a_vpp; 1477 struct namecache *ncp = ap->a_nch->ncp; 1478 struct vattr *vap = ap->a_vap; 1479 struct ucred *cred = ap->a_cred; 1480 char *target = ap->a_target; 1481 int error; 1482 1483 vap->va_type = VLNK; 1484 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1485 if (error == 0) { 1486 tmpfs_knote(*vpp, NOTE_WRITE); 1487 cache_setunresolved(ap->a_nch); 1488 cache_setvp(ap->a_nch, *vpp); 1489 } 1490 return error; 1491 } 1492 1493 /* --------------------------------------------------------------------- */ 1494 1495 static int 1496 tmpfs_readdir(struct vop_readdir_args *ap) 1497 { 1498 struct vnode *vp = ap->a_vp; 1499 struct uio *uio = ap->a_uio; 1500 int *eofflag = ap->a_eofflag; 1501 off_t **cookies = ap->a_cookies; 1502 int *ncookies = ap->a_ncookies; 1503 struct tmpfs_mount *tmp; 1504 int error; 1505 off_t startoff; 1506 off_t cnt = 0; 1507 struct tmpfs_node *node; 1508 1509 /* This operation only makes sense on directory nodes. */ 1510 if (vp->v_type != VDIR) { 1511 return ENOTDIR; 1512 } 1513 1514 tmp = VFS_TO_TMPFS(vp->v_mount); 1515 node = VP_TO_TMPFS_DIR(vp); 1516 startoff = uio->uio_offset; 1517 1518 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1519 error = tmpfs_dir_getdotdent(node, uio); 1520 if (error != 0) { 1521 TMPFS_NODE_LOCK_SH(node); 1522 goto outok; 1523 } 1524 cnt++; 1525 } 1526 1527 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1528 /* may lock parent, cannot hold node lock */ 1529 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1530 if (error != 0) { 1531 TMPFS_NODE_LOCK_SH(node); 1532 goto outok; 1533 } 1534 cnt++; 1535 } 1536 1537 TMPFS_NODE_LOCK_SH(node); 1538 error = tmpfs_dir_getdents(node, uio, &cnt); 1539 1540 outok: 1541 KKASSERT(error >= -1); 1542 1543 if (error == -1) 1544 error = 0; 1545 1546 if (eofflag != NULL) 1547 *eofflag = 1548 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1549 1550 /* Update NFS-related variables. */ 1551 if (error == 0 && cookies != NULL && ncookies != NULL) { 1552 off_t i; 1553 off_t off = startoff; 1554 struct tmpfs_dirent *de = NULL; 1555 1556 *ncookies = cnt; 1557 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1558 1559 for (i = 0; i < cnt; i++) { 1560 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1561 if (off == TMPFS_DIRCOOKIE_DOT) { 1562 off = TMPFS_DIRCOOKIE_DOTDOT; 1563 } else { 1564 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1565 de = RB_MIN(tmpfs_dirtree_cookie, 1566 &node->tn_dir.tn_cookietree); 1567 } else if (de != NULL) { 1568 de = RB_NEXT(tmpfs_dirtree_cookie, 1569 &node->tn_dir.tn_cookietree, de); 1570 } else { 1571 de = tmpfs_dir_lookupbycookie(node, 1572 off); 1573 KKASSERT(de != NULL); 1574 de = RB_NEXT(tmpfs_dirtree_cookie, 1575 &node->tn_dir.tn_cookietree, de); 1576 } 1577 if (de == NULL) 1578 off = TMPFS_DIRCOOKIE_EOF; 1579 else 1580 off = tmpfs_dircookie(de); 1581 } 1582 (*cookies)[i] = off; 1583 } 1584 KKASSERT(uio->uio_offset == off); 1585 } 1586 TMPFS_NODE_UNLOCK(node); 1587 1588 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { 1589 TMPFS_NODE_LOCK(node); 1590 node->tn_status |= TMPFS_NODE_ACCESSED; 1591 TMPFS_NODE_UNLOCK(node); 1592 } 1593 return error; 1594 } 1595 1596 /* --------------------------------------------------------------------- */ 1597 1598 static int 1599 tmpfs_readlink(struct vop_readlink_args *ap) 1600 { 1601 struct vnode *vp = ap->a_vp; 1602 struct uio *uio = ap->a_uio; 1603 int error; 1604 struct tmpfs_node *node; 1605 1606 KKASSERT(uio->uio_offset == 0); 1607 KKASSERT(vp->v_type == VLNK); 1608 1609 node = VP_TO_TMPFS_NODE(vp); 1610 TMPFS_NODE_LOCK_SH(node); 1611 error = uiomove(node->tn_link, 1612 MIN(node->tn_size, uio->uio_resid), uio); 1613 TMPFS_NODE_UNLOCK(node); 1614 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) { 1615 TMPFS_NODE_LOCK(node); 1616 node->tn_status |= TMPFS_NODE_ACCESSED; 1617 TMPFS_NODE_UNLOCK(node); 1618 } 1619 return error; 1620 } 1621 1622 /* --------------------------------------------------------------------- */ 1623 1624 static int 1625 tmpfs_inactive(struct vop_inactive_args *ap) 1626 { 1627 struct vnode *vp = ap->a_vp; 1628 struct tmpfs_node *node; 1629 struct mount *mp; 1630 1631 mp = vp->v_mount; 1632 lwkt_gettoken(&mp->mnt_token); 1633 node = VP_TO_TMPFS_NODE(vp); 1634 1635 /* 1636 * Degenerate case 1637 */ 1638 if (node == NULL) { 1639 vrecycle(vp); 1640 lwkt_reltoken(&mp->mnt_token); 1641 return(0); 1642 } 1643 1644 /* 1645 * Get rid of unreferenced deleted vnodes sooner rather than 1646 * later so the data memory can be recovered immediately. 1647 * 1648 * We must truncate the vnode to prevent the normal reclamation 1649 * path from flushing the data for the removed file to disk. 1650 */ 1651 TMPFS_NODE_LOCK(node); 1652 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1653 node->tn_links == 0) 1654 { 1655 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1656 TMPFS_NODE_UNLOCK(node); 1657 if (node->tn_type == VREG) 1658 tmpfs_truncate(vp, 0); 1659 vrecycle(vp); 1660 } else { 1661 /* 1662 * We must retain any VM pages belonging to the vnode's 1663 * object as the vnode will destroy the object during a 1664 * later reclaim. We call vinvalbuf(V_SAVE) to clean 1665 * out the buffer cache. 1666 * 1667 * On DragonFlyBSD, vnodes are not immediately deactivated 1668 * on the 1->0 refs, so this is a relatively optimal 1669 * operation. We have to do this in tmpfs_inactive() 1670 * because the pages will have already been thrown away 1671 * at the time tmpfs_reclaim() is called. 1672 */ 1673 if (node->tn_type == VREG && 1674 node->tn_reg.tn_pages_in_aobj == 0) { 1675 vinvalbuf(vp, V_SAVE, 0, 0); 1676 KKASSERT(RB_EMPTY(&vp->v_rbdirty_tree)); 1677 KKASSERT(RB_EMPTY(&vp->v_rbclean_tree)); 1678 tmpfs_move_pages(vp->v_object, node->tn_reg.tn_aobj); 1679 node->tn_reg.tn_pages_in_aobj = 1; 1680 } 1681 1682 TMPFS_NODE_UNLOCK(node); 1683 } 1684 lwkt_reltoken(&mp->mnt_token); 1685 1686 return 0; 1687 } 1688 1689 /* --------------------------------------------------------------------- */ 1690 1691 int 1692 tmpfs_reclaim(struct vop_reclaim_args *ap) 1693 { 1694 struct vnode *vp = ap->a_vp; 1695 struct tmpfs_mount *tmp; 1696 struct tmpfs_node *node; 1697 struct mount *mp; 1698 1699 mp = vp->v_mount; 1700 lwkt_gettoken(&mp->mnt_token); 1701 1702 node = VP_TO_TMPFS_NODE(vp); 1703 tmp = VFS_TO_TMPFS(vp->v_mount); 1704 KKASSERT(mp == tmp->tm_mount); 1705 1706 tmpfs_free_vp(vp); 1707 1708 /* 1709 * If the node referenced by this vnode was deleted by the 1710 * user, we must free its associated data structures now that 1711 * the vnode is being reclaimed. 1712 * 1713 * Directories have an extra link ref. 1714 */ 1715 TMPFS_NODE_LOCK(node); 1716 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1717 node->tn_links == 0) { 1718 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1719 tmpfs_free_node(tmp, node); 1720 /* eats the lock */ 1721 } else { 1722 TMPFS_NODE_UNLOCK(node); 1723 } 1724 lwkt_reltoken(&mp->mnt_token); 1725 1726 KKASSERT(vp->v_data == NULL); 1727 return 0; 1728 } 1729 1730 /* --------------------------------------------------------------------- */ 1731 1732 static int 1733 tmpfs_mountctl(struct vop_mountctl_args *ap) 1734 { 1735 struct tmpfs_mount *tmp; 1736 struct mount *mp; 1737 int rc; 1738 1739 mp = ap->a_head.a_ops->head.vv_mount; 1740 lwkt_gettoken(&mp->mnt_token); 1741 1742 switch (ap->a_op) { 1743 case (MOUNTCTL_SET_EXPORT): 1744 tmp = (struct tmpfs_mount *) mp->mnt_data; 1745 1746 if (ap->a_ctllen != sizeof(struct export_args)) 1747 rc = (EINVAL); 1748 else 1749 rc = vfs_export(mp, &tmp->tm_export, 1750 (const struct export_args *) ap->a_ctl); 1751 break; 1752 default: 1753 rc = vop_stdmountctl(ap); 1754 break; 1755 } 1756 1757 lwkt_reltoken(&mp->mnt_token); 1758 return (rc); 1759 } 1760 1761 /* --------------------------------------------------------------------- */ 1762 1763 static int 1764 tmpfs_print(struct vop_print_args *ap) 1765 { 1766 struct vnode *vp = ap->a_vp; 1767 1768 struct tmpfs_node *node; 1769 1770 node = VP_TO_TMPFS_NODE(vp); 1771 1772 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1773 node, node->tn_flags, node->tn_links); 1774 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1775 node->tn_mode, node->tn_uid, node->tn_gid, 1776 (uintmax_t)node->tn_size, node->tn_status); 1777 1778 if (vp->v_type == VFIFO) 1779 fifo_printinfo(vp); 1780 1781 kprintf("\n"); 1782 1783 return 0; 1784 } 1785 1786 /* --------------------------------------------------------------------- */ 1787 1788 static int 1789 tmpfs_pathconf(struct vop_pathconf_args *ap) 1790 { 1791 struct vnode *vp = ap->a_vp; 1792 int name = ap->a_name; 1793 register_t *retval = ap->a_retval; 1794 struct tmpfs_mount *tmp; 1795 int error; 1796 1797 error = 0; 1798 1799 switch (name) { 1800 case _PC_CHOWN_RESTRICTED: 1801 *retval = 1; 1802 break; 1803 1804 case _PC_FILESIZEBITS: 1805 tmp = VFS_TO_TMPFS(vp->v_mount); 1806 *retval = max(32, flsll(tmp->tm_pages_max * PAGE_SIZE) + 1); 1807 break; 1808 1809 case _PC_LINK_MAX: 1810 *retval = LINK_MAX; 1811 break; 1812 1813 case _PC_NAME_MAX: 1814 *retval = NAME_MAX; 1815 break; 1816 1817 case _PC_NO_TRUNC: 1818 *retval = 1; 1819 break; 1820 1821 case _PC_PATH_MAX: 1822 *retval = PATH_MAX; 1823 break; 1824 1825 case _PC_PIPE_BUF: 1826 *retval = PIPE_BUF; 1827 break; 1828 1829 case _PC_SYNC_IO: 1830 *retval = 1; 1831 break; 1832 1833 case _PC_2_SYMLINKS: 1834 *retval = 1; 1835 break; 1836 1837 default: 1838 error = EINVAL; 1839 } 1840 1841 return error; 1842 } 1843 1844 /************************************************************************ 1845 * KQFILTER OPS * 1846 ************************************************************************/ 1847 1848 static void filt_tmpfsdetach(struct knote *kn); 1849 static int filt_tmpfsread(struct knote *kn, long hint); 1850 static int filt_tmpfswrite(struct knote *kn, long hint); 1851 static int filt_tmpfsvnode(struct knote *kn, long hint); 1852 1853 static struct filterops tmpfsread_filtops = 1854 { FILTEROP_ISFD | FILTEROP_MPSAFE, 1855 NULL, filt_tmpfsdetach, filt_tmpfsread }; 1856 static struct filterops tmpfswrite_filtops = 1857 { FILTEROP_ISFD | FILTEROP_MPSAFE, 1858 NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1859 static struct filterops tmpfsvnode_filtops = 1860 { FILTEROP_ISFD | FILTEROP_MPSAFE, 1861 NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1862 1863 static int 1864 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1865 { 1866 struct vnode *vp = ap->a_vp; 1867 struct knote *kn = ap->a_kn; 1868 1869 switch (kn->kn_filter) { 1870 case EVFILT_READ: 1871 kn->kn_fop = &tmpfsread_filtops; 1872 break; 1873 case EVFILT_WRITE: 1874 kn->kn_fop = &tmpfswrite_filtops; 1875 break; 1876 case EVFILT_VNODE: 1877 kn->kn_fop = &tmpfsvnode_filtops; 1878 break; 1879 default: 1880 return (EOPNOTSUPP); 1881 } 1882 1883 kn->kn_hook = (caddr_t)vp; 1884 1885 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1886 1887 return(0); 1888 } 1889 1890 static void 1891 filt_tmpfsdetach(struct knote *kn) 1892 { 1893 struct vnode *vp = (void *)kn->kn_hook; 1894 1895 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1896 } 1897 1898 static int 1899 filt_tmpfsread(struct knote *kn, long hint) 1900 { 1901 struct vnode *vp = (void *)kn->kn_hook; 1902 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1903 off_t off; 1904 1905 if (hint == NOTE_REVOKE) { 1906 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1907 return(1); 1908 } 1909 1910 /* 1911 * Interlock against MP races when performing this function. 1912 */ 1913 TMPFS_NODE_LOCK_SH(node); 1914 off = node->tn_size - kn->kn_fp->f_offset; 1915 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1916 if (kn->kn_sfflags & NOTE_OLDAPI) { 1917 TMPFS_NODE_UNLOCK(node); 1918 return(1); 1919 } 1920 if (kn->kn_data == 0) { 1921 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1922 } 1923 TMPFS_NODE_UNLOCK(node); 1924 return (kn->kn_data != 0); 1925 } 1926 1927 static int 1928 filt_tmpfswrite(struct knote *kn, long hint) 1929 { 1930 if (hint == NOTE_REVOKE) 1931 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1932 kn->kn_data = 0; 1933 return (1); 1934 } 1935 1936 static int 1937 filt_tmpfsvnode(struct knote *kn, long hint) 1938 { 1939 if (kn->kn_sfflags & hint) 1940 kn->kn_fflags |= hint; 1941 if (hint == NOTE_REVOKE) { 1942 kn->kn_flags |= (EV_EOF | EV_NODATA); 1943 return (1); 1944 } 1945 return (kn->kn_fflags != 0); 1946 } 1947 1948 /* 1949 * Helper to move VM pages between objects 1950 * 1951 * NOTE: The vm_page_rename() dirties the page, so we can clear the 1952 * PG_NEED_COMMIT flag. If the pages are being moved into tn_aobj, 1953 * the pageout daemon will be able to page them out. 1954 */ 1955 static int 1956 tmpfs_move_pages_callback(vm_page_t p, void *data) 1957 { 1958 struct rb_vm_page_scan_info *info = data; 1959 vm_pindex_t pindex; 1960 1961 pindex = p->pindex; 1962 if (vm_page_busy_try(p, TRUE)) { 1963 vm_page_sleep_busy(p, TRUE, "tpgmov"); 1964 info->error = -1; 1965 return -1; 1966 } 1967 if (p->object != info->object || p->pindex != pindex) { 1968 vm_page_wakeup(p); 1969 info->error = -1; 1970 return -1; 1971 } 1972 vm_page_rename(p, info->backing_object, pindex); 1973 vm_page_clear_commit(p); 1974 vm_page_wakeup(p); 1975 /* page automaticaly made dirty */ 1976 1977 return 0; 1978 } 1979 1980 static 1981 void 1982 tmpfs_move_pages(vm_object_t src, vm_object_t dst) 1983 { 1984 struct rb_vm_page_scan_info info; 1985 1986 vm_object_hold(src); 1987 vm_object_hold(dst); 1988 info.object = src; 1989 info.backing_object = dst; 1990 do { 1991 info.error = 1; 1992 vm_page_rb_tree_RB_SCAN(&src->rb_memq, NULL, 1993 tmpfs_move_pages_callback, &info); 1994 } while (info.error < 0); 1995 vm_object_drop(dst); 1996 vm_object_drop(src); 1997 } 1998 1999 /* --------------------------------------------------------------------- */ 2000 2001 /* 2002 * vnode operations vector used for files stored in a tmpfs file system. 2003 */ 2004 struct vop_ops tmpfs_vnode_vops = { 2005 .vop_default = vop_defaultop, 2006 .vop_getpages = vop_stdgetpages, 2007 .vop_putpages = vop_stdputpages, 2008 .vop_ncreate = tmpfs_ncreate, 2009 .vop_nresolve = tmpfs_nresolve, 2010 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 2011 .vop_nmknod = tmpfs_nmknod, 2012 .vop_open = tmpfs_open, 2013 .vop_close = tmpfs_close, 2014 .vop_access = tmpfs_access, 2015 .vop_getattr = tmpfs_getattr, 2016 .vop_setattr = tmpfs_setattr, 2017 .vop_read = tmpfs_read, 2018 .vop_write = tmpfs_write, 2019 .vop_fsync = tmpfs_fsync, 2020 .vop_mountctl = tmpfs_mountctl, 2021 .vop_nremove = tmpfs_nremove, 2022 .vop_nlink = tmpfs_nlink, 2023 .vop_nrename = tmpfs_nrename, 2024 .vop_nmkdir = tmpfs_nmkdir, 2025 .vop_nrmdir = tmpfs_nrmdir, 2026 .vop_nsymlink = tmpfs_nsymlink, 2027 .vop_readdir = tmpfs_readdir, 2028 .vop_readlink = tmpfs_readlink, 2029 .vop_inactive = tmpfs_inactive, 2030 .vop_reclaim = tmpfs_reclaim, 2031 .vop_print = tmpfs_print, 2032 .vop_pathconf = tmpfs_pathconf, 2033 .vop_bmap = tmpfs_bmap, 2034 .vop_strategy = tmpfs_strategy, 2035 .vop_advlock = tmpfs_advlock, 2036 .vop_kqfilter = tmpfs_kqfilter 2037 }; 2038