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/unistd.h> 49 #include <sys/vfsops.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 #include <vm/swap_pager.h> 57 58 #include <vfs/fifofs/fifo.h> 59 #include <vfs/tmpfs/tmpfs_vnops.h> 60 #include <vfs/tmpfs/tmpfs.h> 61 62 MALLOC_DECLARE(M_TMPFS); 63 64 static __inline 65 void 66 tmpfs_knote(struct vnode *vp, int flags) 67 { 68 if (flags) 69 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 70 } 71 72 73 /* --------------------------------------------------------------------- */ 74 75 static int 76 tmpfs_nresolve(struct vop_nresolve_args *v) 77 { 78 struct vnode *dvp = v->a_dvp; 79 struct vnode *vp = NULL; 80 struct namecache *ncp = v->a_nch->ncp; 81 struct tmpfs_node *tnode; 82 83 int error; 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode; 86 87 dnode = VP_TO_TMPFS_DIR(dvp); 88 89 de = tmpfs_dir_lookup(dnode, NULL, ncp); 90 if (de == NULL) { 91 error = ENOENT; 92 } else { 93 /* 94 * Allocate a vnode for the node we found. 95 */ 96 tnode = de->td_node; 97 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 98 LK_EXCLUSIVE | LK_RETRY, &vp); 99 if (error) 100 goto out; 101 KKASSERT(vp); 102 } 103 104 out: 105 /* 106 * Store the result of this lookup in the cache. Avoid this if the 107 * request was for creation, as it does not improve timings on 108 * emprical tests. 109 */ 110 if (vp) { 111 vn_unlock(vp); 112 cache_setvp(v->a_nch, vp); 113 vrele(vp); 114 } else if (error == ENOENT) { 115 cache_setvp(v->a_nch, NULL); 116 } 117 return error; 118 } 119 120 static int 121 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) 122 { 123 struct vnode *dvp = v->a_dvp; 124 struct vnode **vpp = v->a_vpp; 125 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); 126 struct ucred *cred = v->a_cred; 127 int error; 128 129 *vpp = NULL; 130 /* Check accessibility of requested node as a first step. */ 131 error = VOP_ACCESS(dvp, VEXEC, cred); 132 if (error != 0) 133 return error; 134 135 if (dnode->tn_dir.tn_parent != NULL) { 136 /* Allocate a new vnode on the matching entry. */ 137 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 138 LK_EXCLUSIVE | LK_RETRY, vpp); 139 140 if (*vpp) 141 vn_unlock(*vpp); 142 } 143 144 return (*vpp == NULL) ? ENOENT : 0; 145 } 146 147 /* --------------------------------------------------------------------- */ 148 149 static int 150 tmpfs_ncreate(struct vop_ncreate_args *v) 151 { 152 struct vnode *dvp = v->a_dvp; 153 struct vnode **vpp = v->a_vpp; 154 struct namecache *ncp = v->a_nch->ncp; 155 struct vattr *vap = v->a_vap; 156 struct ucred *cred = v->a_cred; 157 int error; 158 159 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 160 161 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 162 if (error == 0) { 163 cache_setunresolved(v->a_nch); 164 cache_setvp(v->a_nch, *vpp); 165 tmpfs_knote(dvp, NOTE_WRITE); 166 } 167 168 return error; 169 } 170 /* --------------------------------------------------------------------- */ 171 172 static int 173 tmpfs_nmknod(struct vop_nmknod_args *v) 174 { 175 struct vnode *dvp = v->a_dvp; 176 struct vnode **vpp = v->a_vpp; 177 struct namecache *ncp = v->a_nch->ncp; 178 struct vattr *vap = v->a_vap; 179 struct ucred *cred = v->a_cred; 180 int error; 181 182 if (vap->va_type != VBLK && vap->va_type != VCHR && 183 vap->va_type != VFIFO) 184 return EINVAL; 185 186 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 187 if (error == 0) { 188 cache_setunresolved(v->a_nch); 189 cache_setvp(v->a_nch, *vpp); 190 tmpfs_knote(dvp, NOTE_WRITE); 191 } 192 193 return error; 194 } 195 196 /* --------------------------------------------------------------------- */ 197 198 static int 199 tmpfs_open(struct vop_open_args *v) 200 { 201 struct vnode *vp = v->a_vp; 202 int mode = v->a_mode; 203 204 int error; 205 struct tmpfs_node *node; 206 207 node = VP_TO_TMPFS_NODE(vp); 208 209 /* The file is still active but all its names have been removed 210 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 211 * it is about to die. */ 212 if (node->tn_links < 1) 213 return (ENOENT); 214 215 /* If the file is marked append-only, deny write requests. */ 216 if ((node->tn_flags & APPEND) && 217 (mode & (FWRITE | O_APPEND)) == FWRITE) { 218 error = EPERM; 219 } else { 220 return (vop_stdopen(v)); 221 } 222 return error; 223 } 224 225 /* --------------------------------------------------------------------- */ 226 227 static int 228 tmpfs_close(struct vop_close_args *v) 229 { 230 struct vnode *vp = v->a_vp; 231 struct tmpfs_node *node; 232 233 node = VP_TO_TMPFS_NODE(vp); 234 235 if (node->tn_links > 0) { 236 /* Update node times. No need to do it if the node has 237 * been deleted, because it will vanish after we return. */ 238 tmpfs_update(vp); 239 } 240 241 return vop_stdclose(v); 242 } 243 244 /* --------------------------------------------------------------------- */ 245 246 int 247 tmpfs_access(struct vop_access_args *v) 248 { 249 struct vnode *vp = v->a_vp; 250 int error; 251 struct tmpfs_node *node; 252 253 node = VP_TO_TMPFS_NODE(vp); 254 255 switch (vp->v_type) { 256 case VDIR: 257 /* FALLTHROUGH */ 258 case VLNK: 259 /* FALLTHROUGH */ 260 case VREG: 261 if ((v->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 262 error = EROFS; 263 goto out; 264 } 265 break; 266 267 case VBLK: 268 /* FALLTHROUGH */ 269 case VCHR: 270 /* FALLTHROUGH */ 271 case VSOCK: 272 /* FALLTHROUGH */ 273 case VFIFO: 274 break; 275 276 default: 277 error = EINVAL; 278 goto out; 279 } 280 281 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 282 error = EPERM; 283 goto out; 284 } 285 286 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0); 287 288 out: 289 290 return error; 291 } 292 293 /* --------------------------------------------------------------------- */ 294 295 int 296 tmpfs_getattr(struct vop_getattr_args *v) 297 { 298 struct vnode *vp = v->a_vp; 299 struct vattr *vap = v->a_vap; 300 struct tmpfs_node *node; 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 lwkt_gettoken(&vp->v_mount->mnt_token); 305 tmpfs_update(vp); 306 307 vap->va_type = vp->v_type; 308 vap->va_mode = node->tn_mode; 309 vap->va_nlink = node->tn_links; 310 vap->va_uid = node->tn_uid; 311 vap->va_gid = node->tn_gid; 312 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 313 vap->va_fileid = node->tn_id; 314 vap->va_size = node->tn_size; 315 vap->va_blocksize = PAGE_SIZE; 316 vap->va_atime.tv_sec = node->tn_atime; 317 vap->va_atime.tv_nsec = node->tn_atimensec; 318 vap->va_mtime.tv_sec = node->tn_mtime; 319 vap->va_mtime.tv_nsec = node->tn_mtimensec; 320 vap->va_ctime.tv_sec = node->tn_ctime; 321 vap->va_ctime.tv_nsec = node->tn_ctimensec; 322 vap->va_gen = node->tn_gen; 323 vap->va_flags = node->tn_flags; 324 if (vp->v_type == VBLK || vp->v_type == VCHR) 325 { 326 vap->va_rmajor = umajor(node->tn_rdev); 327 vap->va_rminor = uminor(node->tn_rdev); 328 } 329 vap->va_bytes = round_page(node->tn_size); 330 vap->va_filerev = 0; 331 332 lwkt_reltoken(&vp->v_mount->mnt_token); 333 334 return 0; 335 } 336 337 /* --------------------------------------------------------------------- */ 338 339 int 340 tmpfs_setattr(struct vop_setattr_args *v) 341 { 342 struct vnode *vp = v->a_vp; 343 struct vattr *vap = v->a_vap; 344 struct ucred *cred = v->a_cred; 345 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 346 int error = 0; 347 int kflags = 0; 348 349 if (error == 0 && (vap->va_flags != VNOVAL)) { 350 error = tmpfs_chflags(vp, vap->va_flags, cred); 351 kflags |= NOTE_ATTRIB; 352 } 353 354 if (error == 0 && (vap->va_size != VNOVAL)) { 355 if (vap->va_size > node->tn_size) 356 kflags |= NOTE_WRITE | NOTE_EXTEND; 357 else 358 kflags |= NOTE_WRITE; 359 error = tmpfs_chsize(vp, vap->va_size, cred); 360 } 361 362 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 363 vap->va_gid != (gid_t)VNOVAL)) { 364 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 365 kflags |= NOTE_ATTRIB; 366 } 367 368 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 369 error = tmpfs_chmod(vp, vap->va_mode, cred); 370 kflags |= NOTE_ATTRIB; 371 } 372 373 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 374 vap->va_atime.tv_nsec != VNOVAL) || 375 (vap->va_mtime.tv_sec != VNOVAL && 376 vap->va_mtime.tv_nsec != VNOVAL) )) { 377 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 378 vap->va_vaflags, cred); 379 kflags |= NOTE_ATTRIB; 380 } 381 382 /* Update the node times. We give preference to the error codes 383 * generated by this function rather than the ones that may arise 384 * from tmpfs_update. */ 385 tmpfs_update(vp); 386 tmpfs_knote(vp, kflags); 387 388 return error; 389 } 390 391 /* --------------------------------------------------------------------- */ 392 393 /* 394 * fsync is usually a NOP, but we must take action when unmounting or 395 * when recycling. 396 */ 397 static int 398 tmpfs_fsync(struct vop_fsync_args *v) 399 { 400 struct tmpfs_mount *tmp; 401 struct tmpfs_node *node; 402 struct vnode *vp = v->a_vp; 403 404 tmp = VFS_TO_TMPFS(vp->v_mount); 405 node = VP_TO_TMPFS_NODE(vp); 406 407 tmpfs_update(vp); 408 if (vp->v_type == VREG) { 409 if (vp->v_flag & VRECLAIMED) { 410 if (node->tn_links == 0) 411 tmpfs_truncate(vp, 0); 412 else 413 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); 414 } 415 } 416 return 0; 417 } 418 419 /* --------------------------------------------------------------------- */ 420 421 static int 422 tmpfs_read (struct vop_read_args *ap) 423 { 424 struct buf *bp; 425 struct vnode *vp = ap->a_vp; 426 struct uio *uio = ap->a_uio; 427 struct tmpfs_node *node; 428 off_t base_offset; 429 size_t offset; 430 size_t len; 431 int error; 432 433 error = 0; 434 if (uio->uio_resid == 0) { 435 return error; 436 } 437 438 node = VP_TO_TMPFS_NODE(vp); 439 440 if (uio->uio_offset < 0) 441 return (EINVAL); 442 if (vp->v_type != VREG) 443 return (EINVAL); 444 445 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 446 /* 447 * Use buffer cache I/O (via tmpfs_strategy) 448 */ 449 offset = (size_t)uio->uio_offset & BMASK; 450 base_offset = (off_t)uio->uio_offset - offset; 451 bp = getcacheblk(vp, base_offset, BSIZE); 452 if (bp == NULL) 453 { 454 lwkt_gettoken(&vp->v_mount->mnt_token); 455 error = bread(vp, base_offset, BSIZE, &bp); 456 if (error) { 457 brelse(bp); 458 lwkt_reltoken(&vp->v_mount->mnt_token); 459 kprintf("tmpfs_read bread error %d\n", error); 460 break; 461 } 462 lwkt_reltoken(&vp->v_mount->mnt_token); 463 } 464 465 /* 466 * Figure out how many bytes we can actually copy this loop. 467 */ 468 len = BSIZE - offset; 469 if (len > uio->uio_resid) 470 len = uio->uio_resid; 471 if (len > node->tn_size - uio->uio_offset) 472 len = (size_t)(node->tn_size - uio->uio_offset); 473 474 error = uiomove((char *)bp->b_data + offset, len, uio); 475 bqrelse(bp); 476 if (error) { 477 kprintf("tmpfs_read uiomove error %d\n", error); 478 break; 479 } 480 } 481 482 TMPFS_NODE_LOCK(node); 483 node->tn_status |= TMPFS_NODE_ACCESSED; 484 TMPFS_NODE_UNLOCK(node); 485 486 return(error); 487 } 488 489 static int 490 tmpfs_write (struct vop_write_args *ap) 491 { 492 struct buf *bp; 493 struct vnode *vp = ap->a_vp; 494 struct uio *uio = ap->a_uio; 495 struct thread *td = uio->uio_td; 496 struct tmpfs_node *node; 497 boolean_t extended; 498 off_t oldsize; 499 int error; 500 off_t base_offset; 501 size_t offset; 502 size_t len; 503 struct rlimit limit; 504 int trivial = 0; 505 int kflags = 0; 506 507 error = 0; 508 if (uio->uio_resid == 0) { 509 return error; 510 } 511 512 node = VP_TO_TMPFS_NODE(vp); 513 514 if (vp->v_type != VREG) 515 return (EINVAL); 516 517 lwkt_gettoken(&vp->v_mount->mnt_token); 518 519 oldsize = node->tn_size; 520 if (ap->a_ioflag & IO_APPEND) 521 uio->uio_offset = node->tn_size; 522 523 /* 524 * Check for illegal write offsets. 525 */ 526 if (uio->uio_offset + uio->uio_resid > 527 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 528 lwkt_reltoken(&vp->v_mount->mnt_token); 529 return (EFBIG); 530 } 531 532 if (vp->v_type == VREG && td != NULL) { 533 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 534 if (error != 0) { 535 lwkt_reltoken(&vp->v_mount->mnt_token); 536 return error; 537 } 538 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 539 ksignal(td->td_proc, SIGXFSZ); 540 lwkt_reltoken(&vp->v_mount->mnt_token); 541 return (EFBIG); 542 } 543 } 544 545 546 /* 547 * Extend the file's size if necessary 548 */ 549 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 550 551 while (uio->uio_resid > 0) { 552 /* 553 * Use buffer cache I/O (via tmpfs_strategy) 554 */ 555 offset = (size_t)uio->uio_offset & BMASK; 556 base_offset = (off_t)uio->uio_offset - offset; 557 len = BSIZE - offset; 558 if (len > uio->uio_resid) 559 len = uio->uio_resid; 560 561 if ((uio->uio_offset + len) > node->tn_size) { 562 trivial = (uio->uio_offset <= node->tn_size); 563 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); 564 if (error) 565 break; 566 } 567 568 /* 569 * Read to fill in any gaps. Theoretically we could 570 * optimize this if the write covers the entire buffer 571 * and is not a UIO_NOCOPY write, however this can lead 572 * to a security violation exposing random kernel memory 573 * (whatever junk was in the backing VM pages before). 574 * 575 * So just use bread() to do the right thing. 576 */ 577 error = bread(vp, base_offset, BSIZE, &bp); 578 error = uiomove((char *)bp->b_data + offset, len, uio); 579 if (error) { 580 kprintf("tmpfs_write uiomove error %d\n", error); 581 brelse(bp); 582 break; 583 } 584 585 if (uio->uio_offset > node->tn_size) { 586 node->tn_size = uio->uio_offset; 587 kflags |= NOTE_EXTEND; 588 } 589 kflags |= NOTE_WRITE; 590 591 /* 592 * The data has been loaded into the buffer, write it out. 593 * 594 * We want tmpfs to be able to use all available ram, not 595 * just the buffer cache, so if not explicitly paging we 596 * use buwrite() to leave the buffer clean but mark all the 597 * VM pages valid+dirty. 598 * 599 * When the kernel is paging, either via normal pageout 600 * operation or when cleaning the object during a recycle, 601 * the underlying VM pages are going to get thrown away 602 * so we MUST write them to swap. 603 * 604 * XXX unfortunately this catches msync() system calls too 605 * for the moment. 606 */ 607 if (vm_swap_size == 0) { 608 /* 609 * if swap isn't configured yet, force a buwrite() to 610 * avoid problems further down the line, due to flushing 611 * to swap. 612 */ 613 buwrite(bp); 614 } else { 615 if (ap->a_ioflag & IO_SYNC) { 616 bwrite(bp); 617 } else if ((ap->a_ioflag & IO_ASYNC) || 618 (uio->uio_segflg == UIO_NOCOPY)) { 619 bawrite(bp); 620 } else { 621 buwrite(bp); 622 } 623 } 624 625 if (bp->b_error) { 626 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 627 break; 628 } 629 } 630 631 if (error) { 632 if (extended) { 633 (void)tmpfs_reg_resize(vp, oldsize, trivial); 634 kflags &= ~NOTE_EXTEND; 635 } 636 goto done; 637 } 638 639 TMPFS_NODE_LOCK(node); 640 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 641 (extended? TMPFS_NODE_CHANGED : 0); 642 643 if (node->tn_mode & (S_ISUID | S_ISGID)) { 644 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 645 node->tn_mode &= ~(S_ISUID | S_ISGID); 646 } 647 TMPFS_NODE_UNLOCK(node); 648 done: 649 650 tmpfs_knote(vp, kflags); 651 652 653 lwkt_reltoken(&vp->v_mount->mnt_token); 654 return(error); 655 } 656 657 static int 658 tmpfs_advlock (struct vop_advlock_args *ap) 659 { 660 struct tmpfs_node *node; 661 struct vnode *vp = ap->a_vp; 662 663 node = VP_TO_TMPFS_NODE(vp); 664 665 return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 666 } 667 668 static int 669 tmpfs_strategy(struct vop_strategy_args *ap) 670 { 671 struct bio *bio = ap->a_bio; 672 struct buf *bp = bio->bio_buf; 673 struct vnode *vp = ap->a_vp; 674 struct tmpfs_node *node; 675 vm_object_t uobj; 676 677 if (vp->v_type != VREG) { 678 bp->b_resid = bp->b_bcount; 679 bp->b_flags |= B_ERROR | B_INVAL; 680 bp->b_error = EINVAL; 681 biodone(bio); 682 return(0); 683 } 684 685 lwkt_gettoken(&vp->v_mount->mnt_token); 686 node = VP_TO_TMPFS_NODE(vp); 687 688 uobj = node->tn_reg.tn_aobj; 689 690 /* 691 * Call swap_pager_strategy to read or write between the VM 692 * object and the buffer cache. 693 */ 694 swap_pager_strategy(uobj, bio); 695 696 lwkt_reltoken(&vp->v_mount->mnt_token); 697 return 0; 698 } 699 700 static int 701 tmpfs_bmap(struct vop_bmap_args *ap) 702 { 703 if (ap->a_doffsetp != NULL) 704 *ap->a_doffsetp = ap->a_loffset; 705 if (ap->a_runp != NULL) 706 *ap->a_runp = 0; 707 if (ap->a_runb != NULL) 708 *ap->a_runb = 0; 709 710 return 0; 711 } 712 713 /* --------------------------------------------------------------------- */ 714 715 static int 716 tmpfs_nremove(struct vop_nremove_args *v) 717 { 718 struct vnode *dvp = v->a_dvp; 719 struct namecache *ncp = v->a_nch->ncp; 720 struct vnode *vp; 721 int error; 722 struct tmpfs_dirent *de; 723 struct tmpfs_mount *tmp; 724 struct tmpfs_node *dnode; 725 struct tmpfs_node *node; 726 727 /* 728 * We have to acquire the vp from v->a_nch because 729 * we will likely unresolve the namecache entry, and 730 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim 731 * sequence to recover space from the file. 732 */ 733 error = cache_vref(v->a_nch, v->a_cred, &vp); 734 KKASSERT(error == 0); 735 736 if (vp->v_type == VDIR) { 737 error = EISDIR; 738 goto out; 739 } 740 741 dnode = VP_TO_TMPFS_DIR(dvp); 742 node = VP_TO_TMPFS_NODE(vp); 743 tmp = VFS_TO_TMPFS(vp->v_mount); 744 de = tmpfs_dir_lookup(dnode, node, ncp); 745 if (de == NULL) { 746 error = ENOENT; 747 goto out; 748 } 749 750 /* Files marked as immutable or append-only cannot be deleted. */ 751 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 752 (dnode->tn_flags & APPEND)) { 753 error = EPERM; 754 goto out; 755 } 756 757 /* Remove the entry from the directory; as it is a file, we do not 758 * have to change the number of hard links of the directory. */ 759 tmpfs_dir_detach(dnode, de); 760 761 /* Free the directory entry we just deleted. Note that the node 762 * referred by it will not be removed until the vnode is really 763 * reclaimed. */ 764 tmpfs_free_dirent(tmp, de); 765 766 if (node->tn_links > 0) { 767 TMPFS_NODE_LOCK(node); 768 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 769 TMPFS_NODE_MODIFIED; 770 TMPFS_NODE_UNLOCK(node); 771 } 772 773 cache_setunresolved(v->a_nch); 774 cache_setvp(v->a_nch, NULL); 775 tmpfs_knote(vp, NOTE_DELETE); 776 /*cache_inval_vp(vp, CINV_DESTROY);*/ 777 tmpfs_knote(dvp, NOTE_WRITE); 778 error = 0; 779 780 out: 781 vrele(vp); 782 783 return error; 784 } 785 786 /* --------------------------------------------------------------------- */ 787 788 static int 789 tmpfs_nlink(struct vop_nlink_args *v) 790 { 791 struct vnode *dvp = v->a_dvp; 792 struct vnode *vp = v->a_vp; 793 struct namecache *ncp = v->a_nch->ncp; 794 struct tmpfs_dirent *de; 795 struct tmpfs_node *node; 796 struct tmpfs_node *dnode; 797 int error; 798 799 KKASSERT(dvp != vp); /* XXX When can this be false? */ 800 801 node = VP_TO_TMPFS_NODE(vp); 802 dnode = VP_TO_TMPFS_NODE(dvp); 803 804 /* XXX: Why aren't the following two tests done by the caller? */ 805 806 /* Hard links of directories are forbidden. */ 807 if (vp->v_type == VDIR) { 808 error = EPERM; 809 goto out; 810 } 811 812 /* Cannot create cross-device links. */ 813 if (dvp->v_mount != vp->v_mount) { 814 error = EXDEV; 815 goto out; 816 } 817 818 /* Ensure that we do not overflow the maximum number of links imposed 819 * by the system. */ 820 KKASSERT(node->tn_links <= LINK_MAX); 821 if (node->tn_links == LINK_MAX) { 822 error = EMLINK; 823 goto out; 824 } 825 826 /* We cannot create links of files marked immutable or append-only. */ 827 if (node->tn_flags & (IMMUTABLE | APPEND)) { 828 error = EPERM; 829 goto out; 830 } 831 832 /* Allocate a new directory entry to represent the node. */ 833 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 834 ncp->nc_name, ncp->nc_nlen, &de); 835 if (error != 0) 836 goto out; 837 838 /* Insert the new directory entry into the appropriate directory. */ 839 tmpfs_dir_attach(dnode, de); 840 841 /* vp link count has changed, so update node times. */ 842 843 TMPFS_NODE_LOCK(node); 844 node->tn_status |= TMPFS_NODE_CHANGED; 845 TMPFS_NODE_UNLOCK(node); 846 tmpfs_update(vp); 847 848 tmpfs_knote(vp, NOTE_LINK); 849 cache_setunresolved(v->a_nch); 850 cache_setvp(v->a_nch, vp); 851 tmpfs_knote(dvp, NOTE_WRITE); 852 error = 0; 853 854 out: 855 return error; 856 } 857 858 /* --------------------------------------------------------------------- */ 859 860 static int 861 tmpfs_nrename(struct vop_nrename_args *v) 862 { 863 struct vnode *fdvp = v->a_fdvp; 864 struct namecache *fncp = v->a_fnch->ncp; 865 struct vnode *fvp = fncp->nc_vp; 866 struct vnode *tdvp = v->a_tdvp; 867 struct namecache *tncp = v->a_tnch->ncp; 868 struct vnode *tvp = tncp->nc_vp; 869 struct tmpfs_dirent *de; 870 struct tmpfs_mount *tmp; 871 struct tmpfs_node *fdnode; 872 struct tmpfs_node *fnode; 873 struct tmpfs_node *tnode; 874 struct tmpfs_node *tdnode; 875 char *newname; 876 char *oldname; 877 int error; 878 879 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 880 881 /* Disallow cross-device renames. 882 * XXX Why isn't this done by the caller? */ 883 if (fvp->v_mount != tdvp->v_mount || 884 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 885 error = EXDEV; 886 goto out; 887 } 888 889 tmp = VFS_TO_TMPFS(tdvp->v_mount); 890 tdnode = VP_TO_TMPFS_DIR(tdvp); 891 892 /* If source and target are the same file, there is nothing to do. */ 893 if (fvp == tvp) { 894 error = 0; 895 goto out; 896 } 897 898 fdnode = VP_TO_TMPFS_DIR(fdvp); 899 fnode = VP_TO_TMPFS_NODE(fvp); 900 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 901 902 /* Avoid manipulating '.' and '..' entries. */ 903 if (de == NULL) { 904 error = ENOENT; 905 goto out_locked; 906 } 907 KKASSERT(de->td_node == fnode); 908 909 /* 910 * If replacing an entry in the target directory and that entry 911 * is a directory, it must be empty. 912 * 913 * Kern_rename gurantees the destination to be a directory 914 * if the source is one (it does?). 915 */ 916 if (tvp != NULL) { 917 KKASSERT(tnode != NULL); 918 919 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 920 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 921 error = EPERM; 922 goto out_locked; 923 } 924 925 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 926 if (tnode->tn_size > 0) { 927 error = ENOTEMPTY; 928 goto out_locked; 929 } 930 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 931 error = ENOTDIR; 932 goto out_locked; 933 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 934 error = EISDIR; 935 goto out_locked; 936 } else { 937 KKASSERT(fnode->tn_type != VDIR && 938 tnode->tn_type != VDIR); 939 } 940 } 941 942 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 943 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 944 error = EPERM; 945 goto out_locked; 946 } 947 948 /* 949 * Ensure that we have enough memory to hold the new name, if it 950 * has to be changed. 951 */ 952 if (fncp->nc_nlen != tncp->nc_nlen || 953 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 954 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 955 M_WAITOK | M_NULLOK); 956 if (newname == NULL) { 957 error = ENOSPC; 958 goto out_locked; 959 } 960 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 961 newname[tncp->nc_nlen] = '\0'; 962 } else { 963 newname = NULL; 964 } 965 966 /* 967 * Unlink entry from source directory. Note that the kernel has 968 * already checked for illegal recursion cases (renaming a directory 969 * into a subdirectory of itself). 970 */ 971 if (fdnode != tdnode) 972 tmpfs_dir_detach(fdnode, de); 973 974 /* 975 * Handle any name change. Swap with newname, we will 976 * deallocate it at the end. 977 */ 978 if (newname != NULL) { 979 #if 0 980 TMPFS_NODE_LOCK(fnode); 981 fnode->tn_status |= TMPFS_NODE_CHANGED; 982 TMPFS_NODE_UNLOCK(fnode); 983 #endif 984 oldname = de->td_name; 985 de->td_name = newname; 986 de->td_namelen = (uint16_t)tncp->nc_nlen; 987 newname = oldname; 988 } 989 990 /* 991 * Link entry to target directory. If the entry 992 * represents a directory move the parent linkage 993 * as well. 994 */ 995 if (fdnode != tdnode) { 996 if (de->td_node->tn_type == VDIR) { 997 TMPFS_VALIDATE_DIR(fnode); 998 999 TMPFS_NODE_LOCK(tdnode); 1000 tdnode->tn_links++; 1001 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1002 TMPFS_NODE_UNLOCK(tdnode); 1003 1004 TMPFS_NODE_LOCK(fnode); 1005 fnode->tn_dir.tn_parent = tdnode; 1006 fnode->tn_status |= TMPFS_NODE_CHANGED; 1007 TMPFS_NODE_UNLOCK(fnode); 1008 1009 TMPFS_NODE_LOCK(fdnode); 1010 fdnode->tn_links--; 1011 fdnode->tn_status |= TMPFS_NODE_MODIFIED; 1012 TMPFS_NODE_UNLOCK(fdnode); 1013 } 1014 tmpfs_dir_attach(tdnode, de); 1015 } else { 1016 TMPFS_NODE_LOCK(tdnode); 1017 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1018 TMPFS_NODE_UNLOCK(tdnode); 1019 } 1020 1021 /* 1022 * If we are overwriting an entry, we have to remove the old one 1023 * from the target directory. 1024 */ 1025 if (tvp != NULL) { 1026 /* Remove the old entry from the target directory. */ 1027 de = tmpfs_dir_lookup(tdnode, tnode, tncp); 1028 tmpfs_dir_detach(tdnode, de); 1029 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1030 1031 /* 1032 * Free the directory entry we just deleted. Note that the 1033 * node referred by it will not be removed until the vnode is 1034 * really reclaimed. 1035 */ 1036 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de); 1037 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1038 } 1039 1040 /* 1041 * Finish up 1042 */ 1043 if (newname) { 1044 kfree(newname, tmp->tm_name_zone); 1045 newname = NULL; 1046 } 1047 cache_rename(v->a_fnch, v->a_tnch); 1048 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1049 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1050 if (fnode->tn_vnode) 1051 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1052 error = 0; 1053 1054 out_locked: 1055 ; 1056 1057 out: 1058 /* Release target nodes. */ 1059 /* XXX: I don't understand when tdvp can be the same as tvp, but 1060 * other code takes care of this... */ 1061 if (tdvp == tvp) 1062 vrele(tdvp); 1063 1064 return error; 1065 } 1066 1067 /* --------------------------------------------------------------------- */ 1068 1069 static int 1070 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1071 { 1072 struct vnode *dvp = v->a_dvp; 1073 struct vnode **vpp = v->a_vpp; 1074 struct namecache *ncp = v->a_nch->ncp; 1075 struct vattr *vap = v->a_vap; 1076 struct ucred *cred = v->a_cred; 1077 int error; 1078 1079 KKASSERT(vap->va_type == VDIR); 1080 1081 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1082 if (error == 0) { 1083 cache_setunresolved(v->a_nch); 1084 cache_setvp(v->a_nch, *vpp); 1085 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1086 } 1087 1088 return error; 1089 } 1090 1091 /* --------------------------------------------------------------------- */ 1092 1093 static int 1094 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1095 { 1096 struct vnode *dvp = v->a_dvp; 1097 struct namecache *ncp = v->a_nch->ncp; 1098 struct vnode *vp; 1099 struct tmpfs_dirent *de; 1100 struct tmpfs_mount *tmp; 1101 struct tmpfs_node *dnode; 1102 struct tmpfs_node *node; 1103 int error; 1104 1105 /* 1106 * We have to acquire the vp from v->a_nch because 1107 * we will likely unresolve the namecache entry, and 1108 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim 1109 * sequence. 1110 */ 1111 error = cache_vref(v->a_nch, v->a_cred, &vp); 1112 KKASSERT(error == 0); 1113 1114 /* 1115 * Prevalidate so we don't hit an assertion later 1116 */ 1117 if (vp->v_type != VDIR) { 1118 error = ENOTDIR; 1119 goto out; 1120 } 1121 1122 tmp = VFS_TO_TMPFS(dvp->v_mount); 1123 dnode = VP_TO_TMPFS_DIR(dvp); 1124 node = VP_TO_TMPFS_DIR(vp); 1125 1126 /* Directories with more than two entries ('.' and '..') cannot be 1127 * removed. */ 1128 if (node->tn_size > 0) { 1129 error = ENOTEMPTY; 1130 goto out; 1131 } 1132 1133 if ((dnode->tn_flags & APPEND) 1134 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1135 error = EPERM; 1136 goto out; 1137 } 1138 1139 /* This invariant holds only if we are not trying to remove "..". 1140 * We checked for that above so this is safe now. */ 1141 KKASSERT(node->tn_dir.tn_parent == dnode); 1142 1143 /* Get the directory entry associated with node (vp). This was 1144 * filled by tmpfs_lookup while looking up the entry. */ 1145 de = tmpfs_dir_lookup(dnode, node, ncp); 1146 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1147 ncp->nc_name, 1148 ncp->nc_nlen)); 1149 1150 /* Check flags to see if we are allowed to remove the directory. */ 1151 if ((dnode->tn_flags & APPEND) || 1152 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1153 error = EPERM; 1154 goto out; 1155 } 1156 1157 1158 /* Detach the directory entry from the directory (dnode). */ 1159 tmpfs_dir_detach(dnode, de); 1160 1161 /* No vnode should be allocated for this entry from this point */ 1162 TMPFS_NODE_LOCK(node); 1163 TMPFS_ASSERT_ELOCKED(node); 1164 TMPFS_NODE_LOCK(dnode); 1165 TMPFS_ASSERT_ELOCKED(dnode); 1166 1167 #if 0 1168 /* handled by tmpfs_free_node */ 1169 KKASSERT(node->tn_links > 0); 1170 node->tn_links--; 1171 node->tn_dir.tn_parent = NULL; 1172 #endif 1173 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1174 TMPFS_NODE_MODIFIED; 1175 1176 #if 0 1177 /* handled by tmpfs_free_node */ 1178 KKASSERT(dnode->tn_links > 0); 1179 dnode->tn_links--; 1180 #endif 1181 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1182 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1183 1184 TMPFS_NODE_UNLOCK(dnode); 1185 TMPFS_NODE_UNLOCK(node); 1186 1187 /* Free the directory entry we just deleted. Note that the node 1188 * referred by it will not be removed until the vnode is really 1189 * reclaimed. */ 1190 tmpfs_free_dirent(tmp, de); 1191 1192 /* Release the deleted vnode (will destroy the node, notify 1193 * interested parties and clean it from the cache). */ 1194 1195 TMPFS_NODE_LOCK(dnode); 1196 dnode->tn_status |= TMPFS_NODE_CHANGED; 1197 TMPFS_NODE_UNLOCK(dnode); 1198 tmpfs_update(dvp); 1199 1200 cache_setunresolved(v->a_nch); 1201 cache_setvp(v->a_nch, NULL); 1202 /*cache_inval_vp(vp, CINV_DESTROY);*/ 1203 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1204 error = 0; 1205 1206 out: 1207 vrele(vp); 1208 1209 return error; 1210 } 1211 1212 /* --------------------------------------------------------------------- */ 1213 1214 static int 1215 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1216 { 1217 struct vnode *dvp = v->a_dvp; 1218 struct vnode **vpp = v->a_vpp; 1219 struct namecache *ncp = v->a_nch->ncp; 1220 struct vattr *vap = v->a_vap; 1221 struct ucred *cred = v->a_cred; 1222 char *target = v->a_target; 1223 int error; 1224 1225 vap->va_type = VLNK; 1226 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1227 if (error == 0) { 1228 tmpfs_knote(*vpp, NOTE_WRITE); 1229 cache_setunresolved(v->a_nch); 1230 cache_setvp(v->a_nch, *vpp); 1231 } 1232 1233 return error; 1234 } 1235 1236 /* --------------------------------------------------------------------- */ 1237 1238 static int 1239 tmpfs_readdir(struct vop_readdir_args *v) 1240 { 1241 struct vnode *vp = v->a_vp; 1242 struct uio *uio = v->a_uio; 1243 int *eofflag = v->a_eofflag; 1244 off_t **cookies = v->a_cookies; 1245 int *ncookies = v->a_ncookies; 1246 struct tmpfs_mount *tmp; 1247 int error; 1248 off_t startoff; 1249 off_t cnt = 0; 1250 struct tmpfs_node *node; 1251 1252 /* This operation only makes sense on directory nodes. */ 1253 if (vp->v_type != VDIR) 1254 return ENOTDIR; 1255 1256 tmp = VFS_TO_TMPFS(vp->v_mount); 1257 node = VP_TO_TMPFS_DIR(vp); 1258 startoff = uio->uio_offset; 1259 1260 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1261 error = tmpfs_dir_getdotdent(node, uio); 1262 if (error != 0) 1263 goto outok; 1264 cnt++; 1265 } 1266 1267 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1268 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1269 if (error != 0) 1270 goto outok; 1271 cnt++; 1272 } 1273 1274 error = tmpfs_dir_getdents(node, uio, &cnt); 1275 1276 outok: 1277 KKASSERT(error >= -1); 1278 1279 if (error == -1) 1280 error = 0; 1281 1282 if (eofflag != NULL) 1283 *eofflag = 1284 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1285 1286 /* Update NFS-related variables. */ 1287 if (error == 0 && cookies != NULL && ncookies != NULL) { 1288 off_t i; 1289 off_t off = startoff; 1290 struct tmpfs_dirent *de = NULL; 1291 1292 *ncookies = cnt; 1293 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1294 1295 for (i = 0; i < cnt; i++) { 1296 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1297 if (off == TMPFS_DIRCOOKIE_DOT) { 1298 off = TMPFS_DIRCOOKIE_DOTDOT; 1299 } else { 1300 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1301 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1302 } else if (de != NULL) { 1303 de = TAILQ_NEXT(de, td_entries); 1304 } else { 1305 de = tmpfs_dir_lookupbycookie(node, 1306 off); 1307 KKASSERT(de != NULL); 1308 de = TAILQ_NEXT(de, td_entries); 1309 } 1310 if (de == NULL) 1311 off = TMPFS_DIRCOOKIE_EOF; 1312 else 1313 off = tmpfs_dircookie(de); 1314 } 1315 1316 (*cookies)[i] = off; 1317 } 1318 KKASSERT(uio->uio_offset == off); 1319 } 1320 1321 return error; 1322 } 1323 1324 /* --------------------------------------------------------------------- */ 1325 1326 static int 1327 tmpfs_readlink(struct vop_readlink_args *v) 1328 { 1329 struct vnode *vp = v->a_vp; 1330 struct uio *uio = v->a_uio; 1331 1332 int error; 1333 struct tmpfs_node *node; 1334 1335 KKASSERT(uio->uio_offset == 0); 1336 KKASSERT(vp->v_type == VLNK); 1337 1338 node = VP_TO_TMPFS_NODE(vp); 1339 1340 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1341 uio); 1342 TMPFS_NODE_LOCK(node); 1343 node->tn_status |= TMPFS_NODE_ACCESSED; 1344 TMPFS_NODE_UNLOCK(node); 1345 1346 return error; 1347 } 1348 1349 /* --------------------------------------------------------------------- */ 1350 1351 static int 1352 tmpfs_inactive(struct vop_inactive_args *v) 1353 { 1354 struct vnode *vp = v->a_vp; 1355 1356 struct tmpfs_node *node; 1357 1358 node = VP_TO_TMPFS_NODE(vp); 1359 1360 /* 1361 * Get rid of unreferenced deleted vnodes sooner rather than 1362 * later so the data memory can be recovered immediately. 1363 * 1364 * We must truncate the vnode to prevent the normal reclamation 1365 * path from flushing the data for the removed file to disk. 1366 */ 1367 TMPFS_NODE_LOCK(node); 1368 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1369 (node->tn_links == 0 || 1370 (node->tn_links == 1 && node->tn_type == VDIR && 1371 node->tn_dir.tn_parent))) 1372 { 1373 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1374 TMPFS_NODE_UNLOCK(node); 1375 if (node->tn_type == VREG) 1376 tmpfs_truncate(vp, 0); 1377 vrecycle(vp); 1378 } else { 1379 TMPFS_NODE_UNLOCK(node); 1380 } 1381 1382 return 0; 1383 } 1384 1385 /* --------------------------------------------------------------------- */ 1386 1387 int 1388 tmpfs_reclaim(struct vop_reclaim_args *v) 1389 { 1390 struct vnode *vp = v->a_vp; 1391 struct tmpfs_mount *tmp; 1392 struct tmpfs_node *node; 1393 1394 node = VP_TO_TMPFS_NODE(vp); 1395 tmp = VFS_TO_TMPFS(vp->v_mount); 1396 1397 tmpfs_free_vp(vp); 1398 1399 /* 1400 * If the node referenced by this vnode was deleted by the 1401 * user, we must free its associated data structures now that 1402 * the vnode is being reclaimed. 1403 * 1404 * Directories have an extra link ref. 1405 */ 1406 TMPFS_NODE_LOCK(node); 1407 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1408 (node->tn_links == 0 || 1409 (node->tn_links == 1 && node->tn_type == VDIR && 1410 node->tn_dir.tn_parent))) 1411 { 1412 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1413 tmpfs_free_node(tmp, node); 1414 /* eats the lock */ 1415 } else { 1416 TMPFS_NODE_UNLOCK(node); 1417 } 1418 1419 KKASSERT(vp->v_data == NULL); 1420 return 0; 1421 } 1422 1423 /* --------------------------------------------------------------------- */ 1424 1425 static int 1426 tmpfs_print(struct vop_print_args *v) 1427 { 1428 struct vnode *vp = v->a_vp; 1429 1430 struct tmpfs_node *node; 1431 1432 node = VP_TO_TMPFS_NODE(vp); 1433 1434 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1435 node, node->tn_flags, node->tn_links); 1436 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1437 node->tn_mode, node->tn_uid, node->tn_gid, 1438 (uintmax_t)node->tn_size, node->tn_status); 1439 1440 if (vp->v_type == VFIFO) 1441 fifo_printinfo(vp); 1442 1443 kprintf("\n"); 1444 1445 return 0; 1446 } 1447 1448 /* --------------------------------------------------------------------- */ 1449 1450 static int 1451 tmpfs_pathconf(struct vop_pathconf_args *v) 1452 { 1453 int name = v->a_name; 1454 register_t *retval = v->a_retval; 1455 1456 int error; 1457 1458 error = 0; 1459 1460 switch (name) { 1461 case _PC_LINK_MAX: 1462 *retval = LINK_MAX; 1463 break; 1464 1465 case _PC_NAME_MAX: 1466 *retval = NAME_MAX; 1467 break; 1468 1469 case _PC_PATH_MAX: 1470 *retval = PATH_MAX; 1471 break; 1472 1473 case _PC_PIPE_BUF: 1474 *retval = PIPE_BUF; 1475 break; 1476 1477 case _PC_CHOWN_RESTRICTED: 1478 *retval = 1; 1479 break; 1480 1481 case _PC_NO_TRUNC: 1482 *retval = 1; 1483 break; 1484 1485 case _PC_SYNC_IO: 1486 *retval = 1; 1487 break; 1488 1489 case _PC_FILESIZEBITS: 1490 *retval = 0; /* XXX Don't know which value should I return. */ 1491 break; 1492 1493 default: 1494 error = EINVAL; 1495 } 1496 1497 return error; 1498 } 1499 1500 /************************************************************************ 1501 * KQFILTER OPS * 1502 ************************************************************************/ 1503 1504 static void filt_tmpfsdetach(struct knote *kn); 1505 static int filt_tmpfsread(struct knote *kn, long hint); 1506 static int filt_tmpfswrite(struct knote *kn, long hint); 1507 static int filt_tmpfsvnode(struct knote *kn, long hint); 1508 1509 static struct filterops tmpfsread_filtops = 1510 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1511 static struct filterops tmpfswrite_filtops = 1512 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1513 static struct filterops tmpfsvnode_filtops = 1514 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1515 1516 static int 1517 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1518 { 1519 struct vnode *vp = ap->a_vp; 1520 struct knote *kn = ap->a_kn; 1521 1522 switch (kn->kn_filter) { 1523 case EVFILT_READ: 1524 kn->kn_fop = &tmpfsread_filtops; 1525 break; 1526 case EVFILT_WRITE: 1527 kn->kn_fop = &tmpfswrite_filtops; 1528 break; 1529 case EVFILT_VNODE: 1530 kn->kn_fop = &tmpfsvnode_filtops; 1531 break; 1532 default: 1533 return (EOPNOTSUPP); 1534 } 1535 1536 kn->kn_hook = (caddr_t)vp; 1537 1538 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1539 1540 return(0); 1541 } 1542 1543 static void 1544 filt_tmpfsdetach(struct knote *kn) 1545 { 1546 struct vnode *vp = (void *)kn->kn_hook; 1547 1548 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1549 } 1550 1551 static int 1552 filt_tmpfsread(struct knote *kn, long hint) 1553 { 1554 struct vnode *vp = (void *)kn->kn_hook; 1555 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1556 off_t off; 1557 1558 if (hint == NOTE_REVOKE) { 1559 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 1560 return(1); 1561 } 1562 1563 /* 1564 * Interlock against MP races when performing this function. 1565 */ 1566 lwkt_gettoken(&vp->v_mount->mnt_token); 1567 off = node->tn_size - kn->kn_fp->f_offset; 1568 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1569 if (kn->kn_sfflags & NOTE_OLDAPI) { 1570 lwkt_reltoken(&vp->v_mount->mnt_token); 1571 return(1); 1572 } 1573 1574 if (kn->kn_data == 0) { 1575 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1576 } 1577 lwkt_reltoken(&vp->v_mount->mnt_token); 1578 return (kn->kn_data != 0); 1579 } 1580 1581 static int 1582 filt_tmpfswrite(struct knote *kn, long hint) 1583 { 1584 if (hint == NOTE_REVOKE) 1585 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 1586 kn->kn_data = 0; 1587 return (1); 1588 } 1589 1590 static int 1591 filt_tmpfsvnode(struct knote *kn, long hint) 1592 { 1593 if (kn->kn_sfflags & hint) 1594 kn->kn_fflags |= hint; 1595 if (hint == NOTE_REVOKE) { 1596 kn->kn_flags |= EV_EOF; 1597 return (1); 1598 } 1599 return (kn->kn_fflags != 0); 1600 } 1601 1602 1603 /* --------------------------------------------------------------------- */ 1604 1605 /* 1606 * vnode operations vector used for files stored in a tmpfs file system. 1607 */ 1608 struct vop_ops tmpfs_vnode_vops = { 1609 .vop_default = vop_defaultop, 1610 .vop_getpages = vop_stdgetpages, 1611 .vop_putpages = vop_stdputpages, 1612 .vop_ncreate = tmpfs_ncreate, 1613 .vop_nresolve = tmpfs_nresolve, 1614 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1615 .vop_nmknod = tmpfs_nmknod, 1616 .vop_open = tmpfs_open, 1617 .vop_close = tmpfs_close, 1618 .vop_access = tmpfs_access, 1619 .vop_getattr = tmpfs_getattr, 1620 .vop_setattr = tmpfs_setattr, 1621 .vop_read = tmpfs_read, 1622 .vop_write = tmpfs_write, 1623 .vop_fsync = tmpfs_fsync, 1624 .vop_nremove = tmpfs_nremove, 1625 .vop_nlink = tmpfs_nlink, 1626 .vop_nrename = tmpfs_nrename, 1627 .vop_nmkdir = tmpfs_nmkdir, 1628 .vop_nrmdir = tmpfs_nrmdir, 1629 .vop_nsymlink = tmpfs_nsymlink, 1630 .vop_readdir = tmpfs_readdir, 1631 .vop_readlink = tmpfs_readlink, 1632 .vop_inactive = tmpfs_inactive, 1633 .vop_reclaim = tmpfs_reclaim, 1634 .vop_print = tmpfs_print, 1635 .vop_pathconf = tmpfs_pathconf, 1636 .vop_bmap = tmpfs_bmap, 1637 .vop_strategy = tmpfs_strategy, 1638 .vop_advlock = tmpfs_advlock, 1639 .vop_kqfilter = tmpfs_kqfilter 1640 }; 1641