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 <sys/mplock2.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_object.h> 56 #include <vm/vm_page.h> 57 #include <vm/vm_pager.h> 58 #include <vm/swap_pager.h> 59 60 #include <vfs/fifofs/fifo.h> 61 #include <vfs/tmpfs/tmpfs_vnops.h> 62 #include <vfs/tmpfs/tmpfs.h> 63 64 MALLOC_DECLARE(M_TMPFS); 65 66 static __inline 67 void 68 tmpfs_knote(struct vnode *vp, int flags) 69 { 70 if (flags) 71 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 72 } 73 74 75 /* --------------------------------------------------------------------- */ 76 77 static int 78 tmpfs_nresolve(struct vop_nresolve_args *v) 79 { 80 struct vnode *dvp = v->a_dvp; 81 struct vnode *vp = NULL; 82 struct namecache *ncp = v->a_nch->ncp; 83 struct tmpfs_node *tnode; 84 85 int error; 86 struct tmpfs_dirent *de; 87 struct tmpfs_node *dnode; 88 89 dnode = VP_TO_TMPFS_DIR(dvp); 90 91 de = tmpfs_dir_lookup(dnode, NULL, ncp); 92 if (de == NULL) { 93 error = ENOENT; 94 } else { 95 /* 96 * Allocate a vnode for the node we found. 97 */ 98 tnode = de->td_node; 99 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 100 LK_EXCLUSIVE | LK_RETRY, &vp); 101 if (error) 102 goto out; 103 KKASSERT(vp); 104 } 105 106 out: 107 /* 108 * Store the result of this lookup in the cache. Avoid this if the 109 * request was for creation, as it does not improve timings on 110 * emprical tests. 111 */ 112 if (vp) { 113 vn_unlock(vp); 114 cache_setvp(v->a_nch, vp); 115 vrele(vp); 116 } else if (error == ENOENT) { 117 cache_setvp(v->a_nch, NULL); 118 } 119 return error; 120 } 121 122 static int 123 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) 124 { 125 struct vnode *dvp = v->a_dvp; 126 struct vnode **vpp = v->a_vpp; 127 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); 128 struct ucred *cred = v->a_cred; 129 int error; 130 131 *vpp = NULL; 132 /* Check accessibility of requested node as a first step. */ 133 error = VOP_ACCESS(dvp, VEXEC, cred); 134 if (error != 0) 135 return error; 136 137 if (dnode->tn_dir.tn_parent != NULL) { 138 /* Allocate a new vnode on the matching entry. */ 139 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 140 LK_EXCLUSIVE | LK_RETRY, vpp); 141 142 if (*vpp) 143 vn_unlock(*vpp); 144 } 145 146 return (*vpp == NULL) ? ENOENT : 0; 147 } 148 149 /* --------------------------------------------------------------------- */ 150 151 static int 152 tmpfs_ncreate(struct vop_ncreate_args *v) 153 { 154 struct vnode *dvp = v->a_dvp; 155 struct vnode **vpp = v->a_vpp; 156 struct namecache *ncp = v->a_nch->ncp; 157 struct vattr *vap = v->a_vap; 158 struct ucred *cred = v->a_cred; 159 int error; 160 161 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 162 163 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 164 if (error == 0) { 165 cache_setunresolved(v->a_nch); 166 cache_setvp(v->a_nch, *vpp); 167 tmpfs_knote(dvp, NOTE_WRITE); 168 } 169 170 return error; 171 } 172 /* --------------------------------------------------------------------- */ 173 174 static int 175 tmpfs_nmknod(struct vop_nmknod_args *v) 176 { 177 struct vnode *dvp = v->a_dvp; 178 struct vnode **vpp = v->a_vpp; 179 struct namecache *ncp = v->a_nch->ncp; 180 struct vattr *vap = v->a_vap; 181 struct ucred *cred = v->a_cred; 182 int error; 183 184 if (vap->va_type != VBLK && vap->va_type != VCHR && 185 vap->va_type != VFIFO) 186 return EINVAL; 187 188 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 189 if (error == 0) { 190 cache_setunresolved(v->a_nch); 191 cache_setvp(v->a_nch, *vpp); 192 tmpfs_knote(dvp, NOTE_WRITE); 193 } 194 195 return error; 196 } 197 198 /* --------------------------------------------------------------------- */ 199 200 static int 201 tmpfs_open(struct vop_open_args *v) 202 { 203 struct vnode *vp = v->a_vp; 204 int mode = v->a_mode; 205 206 int error; 207 struct tmpfs_node *node; 208 209 node = VP_TO_TMPFS_NODE(vp); 210 211 /* The file is still active but all its names have been removed 212 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 213 * it is about to die. */ 214 if (node->tn_links < 1) 215 return (ENOENT); 216 217 /* If the file is marked append-only, deny write requests. */ 218 if ((node->tn_flags & APPEND) && 219 (mode & (FWRITE | O_APPEND)) == FWRITE) { 220 error = EPERM; 221 } else { 222 return (vop_stdopen(v)); 223 } 224 return error; 225 } 226 227 /* --------------------------------------------------------------------- */ 228 229 static int 230 tmpfs_close(struct vop_close_args *v) 231 { 232 struct vnode *vp = v->a_vp; 233 struct tmpfs_node *node; 234 235 node = VP_TO_TMPFS_NODE(vp); 236 237 if (node->tn_links > 0) { 238 /* Update node times. No need to do it if the node has 239 * been deleted, because it will vanish after we return. */ 240 tmpfs_update(vp); 241 } 242 243 return vop_stdclose(v); 244 } 245 246 /* --------------------------------------------------------------------- */ 247 248 int 249 tmpfs_access(struct vop_access_args *v) 250 { 251 struct vnode *vp = v->a_vp; 252 int error; 253 struct tmpfs_node *node; 254 255 node = VP_TO_TMPFS_NODE(vp); 256 257 switch (vp->v_type) { 258 case VDIR: 259 /* FALLTHROUGH */ 260 case VLNK: 261 /* FALLTHROUGH */ 262 case VREG: 263 if ((v->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 264 error = EROFS; 265 goto out; 266 } 267 break; 268 269 case VBLK: 270 /* FALLTHROUGH */ 271 case VCHR: 272 /* FALLTHROUGH */ 273 case VSOCK: 274 /* FALLTHROUGH */ 275 case VFIFO: 276 break; 277 278 default: 279 error = EINVAL; 280 goto out; 281 } 282 283 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 284 error = EPERM; 285 goto out; 286 } 287 288 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0); 289 290 out: 291 292 return error; 293 } 294 295 /* --------------------------------------------------------------------- */ 296 297 int 298 tmpfs_getattr(struct vop_getattr_args *v) 299 { 300 struct vnode *vp = v->a_vp; 301 struct vattr *vap = v->a_vap; 302 struct tmpfs_node *node; 303 304 node = VP_TO_TMPFS_NODE(vp); 305 306 lwkt_gettoken(&vp->v_mount->mnt_token); 307 tmpfs_update(vp); 308 309 vap->va_type = vp->v_type; 310 vap->va_mode = node->tn_mode; 311 vap->va_nlink = node->tn_links; 312 vap->va_uid = node->tn_uid; 313 vap->va_gid = node->tn_gid; 314 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 315 vap->va_fileid = node->tn_id; 316 vap->va_size = node->tn_size; 317 vap->va_blocksize = PAGE_SIZE; 318 vap->va_atime.tv_sec = node->tn_atime; 319 vap->va_atime.tv_nsec = node->tn_atimensec; 320 vap->va_mtime.tv_sec = node->tn_mtime; 321 vap->va_mtime.tv_nsec = node->tn_mtimensec; 322 vap->va_ctime.tv_sec = node->tn_ctime; 323 vap->va_ctime.tv_nsec = node->tn_ctimensec; 324 vap->va_gen = node->tn_gen; 325 vap->va_flags = node->tn_flags; 326 if (vp->v_type == VBLK || vp->v_type == VCHR) 327 { 328 vap->va_rmajor = umajor(node->tn_rdev); 329 vap->va_rminor = uminor(node->tn_rdev); 330 } 331 vap->va_bytes = round_page(node->tn_size); 332 vap->va_filerev = 0; 333 334 lwkt_reltoken(&vp->v_mount->mnt_token); 335 336 return 0; 337 } 338 339 /* --------------------------------------------------------------------- */ 340 341 int 342 tmpfs_setattr(struct vop_setattr_args *v) 343 { 344 struct vnode *vp = v->a_vp; 345 struct vattr *vap = v->a_vap; 346 struct ucred *cred = v->a_cred; 347 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 348 int error = 0; 349 int kflags = 0; 350 351 if (error == 0 && (vap->va_flags != VNOVAL)) { 352 error = tmpfs_chflags(vp, vap->va_flags, cred); 353 kflags |= NOTE_ATTRIB; 354 } 355 356 if (error == 0 && (vap->va_size != VNOVAL)) { 357 if (vap->va_size > node->tn_size) 358 kflags |= NOTE_WRITE | NOTE_EXTEND; 359 else 360 kflags |= NOTE_WRITE; 361 error = tmpfs_chsize(vp, vap->va_size, cred); 362 } 363 364 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 365 vap->va_gid != (gid_t)VNOVAL)) { 366 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 367 kflags |= NOTE_ATTRIB; 368 } 369 370 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 371 error = tmpfs_chmod(vp, vap->va_mode, cred); 372 kflags |= NOTE_ATTRIB; 373 } 374 375 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 376 vap->va_atime.tv_nsec != VNOVAL) || 377 (vap->va_mtime.tv_sec != VNOVAL && 378 vap->va_mtime.tv_nsec != VNOVAL) )) { 379 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 380 vap->va_vaflags, cred); 381 kflags |= NOTE_ATTRIB; 382 } 383 384 /* Update the node times. We give preference to the error codes 385 * generated by this function rather than the ones that may arise 386 * from tmpfs_update. */ 387 tmpfs_update(vp); 388 tmpfs_knote(vp, kflags); 389 390 return error; 391 } 392 393 /* --------------------------------------------------------------------- */ 394 395 /* 396 * fsync is usually a NOP, but we must take action when unmounting or 397 * when recycling. 398 */ 399 static int 400 tmpfs_fsync(struct vop_fsync_args *v) 401 { 402 struct tmpfs_mount *tmp; 403 struct tmpfs_node *node; 404 struct vnode *vp = v->a_vp; 405 406 tmp = VFS_TO_TMPFS(vp->v_mount); 407 node = VP_TO_TMPFS_NODE(vp); 408 409 tmpfs_update(vp); 410 if (vp->v_type == VREG) { 411 if (vp->v_flag & VRECLAIMED) { 412 if (node->tn_links == 0) 413 tmpfs_truncate(vp, 0); 414 else 415 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); 416 } 417 } 418 return 0; 419 } 420 421 /* --------------------------------------------------------------------- */ 422 423 static int 424 tmpfs_read (struct vop_read_args *ap) 425 { 426 struct buf *bp; 427 struct vnode *vp = ap->a_vp; 428 struct uio *uio = ap->a_uio; 429 struct tmpfs_node *node; 430 off_t base_offset; 431 size_t offset; 432 size_t len; 433 int error; 434 435 error = 0; 436 if (uio->uio_resid == 0) { 437 return error; 438 } 439 440 node = VP_TO_TMPFS_NODE(vp); 441 442 if (uio->uio_offset < 0) 443 return (EINVAL); 444 if (vp->v_type != VREG) 445 return (EINVAL); 446 447 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 448 /* 449 * Use buffer cache I/O (via tmpfs_strategy) 450 */ 451 offset = (size_t)uio->uio_offset & BMASK; 452 base_offset = (off_t)uio->uio_offset - offset; 453 bp = getcacheblk(vp, base_offset, BSIZE); 454 if (bp == NULL) 455 { 456 lwkt_gettoken(&vp->v_mount->mnt_token); 457 error = bread(vp, base_offset, BSIZE, &bp); 458 if (error) { 459 brelse(bp); 460 lwkt_reltoken(&vp->v_mount->mnt_token); 461 kprintf("tmpfs_read bread error %d\n", error); 462 break; 463 } 464 lwkt_reltoken(&vp->v_mount->mnt_token); 465 } 466 467 /* 468 * Figure out how many bytes we can actually copy this loop. 469 */ 470 len = BSIZE - offset; 471 if (len > uio->uio_resid) 472 len = uio->uio_resid; 473 if (len > node->tn_size - uio->uio_offset) 474 len = (size_t)(node->tn_size - uio->uio_offset); 475 476 error = uiomove((char *)bp->b_data + offset, len, uio); 477 bqrelse(bp); 478 if (error) { 479 kprintf("tmpfs_read uiomove error %d\n", error); 480 break; 481 } 482 } 483 484 TMPFS_NODE_LOCK(node); 485 node->tn_status |= TMPFS_NODE_ACCESSED; 486 TMPFS_NODE_UNLOCK(node); 487 488 return(error); 489 } 490 491 static int 492 tmpfs_write (struct vop_write_args *ap) 493 { 494 struct buf *bp; 495 struct vnode *vp = ap->a_vp; 496 struct uio *uio = ap->a_uio; 497 struct thread *td = uio->uio_td; 498 struct tmpfs_node *node; 499 boolean_t extended; 500 off_t oldsize; 501 int error; 502 off_t base_offset; 503 size_t offset; 504 size_t len; 505 struct rlimit limit; 506 int trivial = 0; 507 int kflags = 0; 508 509 error = 0; 510 if (uio->uio_resid == 0) { 511 return error; 512 } 513 514 node = VP_TO_TMPFS_NODE(vp); 515 516 if (vp->v_type != VREG) 517 return (EINVAL); 518 519 lwkt_gettoken(&vp->v_mount->mnt_token); 520 521 oldsize = node->tn_size; 522 if (ap->a_ioflag & IO_APPEND) 523 uio->uio_offset = node->tn_size; 524 525 /* 526 * Check for illegal write offsets. 527 */ 528 if (uio->uio_offset + uio->uio_resid > 529 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 530 lwkt_reltoken(&vp->v_mount->mnt_token); 531 return (EFBIG); 532 } 533 534 if (vp->v_type == VREG && td != NULL) { 535 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 536 if (error != 0) { 537 lwkt_reltoken(&vp->v_mount->mnt_token); 538 return error; 539 } 540 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 541 ksignal(td->td_proc, SIGXFSZ); 542 lwkt_reltoken(&vp->v_mount->mnt_token); 543 return (EFBIG); 544 } 545 } 546 547 548 /* 549 * Extend the file's size if necessary 550 */ 551 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 552 553 get_mplock(); 554 555 while (uio->uio_resid > 0) { 556 /* 557 * Use buffer cache I/O (via tmpfs_strategy) 558 */ 559 offset = (size_t)uio->uio_offset & BMASK; 560 base_offset = (off_t)uio->uio_offset - offset; 561 len = BSIZE - offset; 562 if (len > uio->uio_resid) 563 len = uio->uio_resid; 564 565 if ((uio->uio_offset + len) > node->tn_size) { 566 trivial = (uio->uio_offset <= node->tn_size); 567 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); 568 if (error) 569 break; 570 } 571 572 /* 573 * Read to fill in any gaps. Theoretically we could 574 * optimize this if the write covers the entire buffer 575 * and is not a UIO_NOCOPY write, however this can lead 576 * to a security violation exposing random kernel memory 577 * (whatever junk was in the backing VM pages before). 578 * 579 * So just use bread() to do the right thing. 580 */ 581 error = bread(vp, base_offset, BSIZE, &bp); 582 error = uiomove((char *)bp->b_data + offset, len, uio); 583 if (error) { 584 kprintf("tmpfs_write uiomove error %d\n", error); 585 brelse(bp); 586 break; 587 } 588 589 if (uio->uio_offset > node->tn_size) { 590 node->tn_size = uio->uio_offset; 591 kflags |= NOTE_EXTEND; 592 } 593 kflags |= NOTE_WRITE; 594 595 /* 596 * The data has been loaded into the buffer, write it out. 597 * 598 * We want tmpfs to be able to use all available ram, not 599 * just the buffer cache, so if not explicitly paging we 600 * use buwrite() to leave the buffer clean but mark all the 601 * VM pages valid+dirty. 602 * 603 * When the kernel is paging, either via normal pageout 604 * operation or when cleaning the object during a recycle, 605 * the underlying VM pages are going to get thrown away 606 * so we MUST write them to swap. 607 * 608 * XXX unfortunately this catches msync() system calls too 609 * for the moment. 610 */ 611 if (vm_swap_size == 0) { 612 /* 613 * if swap isn't configured yet, force a buwrite() to 614 * avoid problems further down the line, due to flushing 615 * to swap. 616 */ 617 buwrite(bp); 618 } else { 619 if (ap->a_ioflag & IO_SYNC) { 620 bwrite(bp); 621 } else if ((ap->a_ioflag & IO_ASYNC) || 622 (uio->uio_segflg == UIO_NOCOPY)) { 623 bawrite(bp); 624 } else { 625 buwrite(bp); 626 } 627 } 628 629 if (bp->b_error) { 630 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 631 break; 632 } 633 } 634 635 rel_mplock(); 636 637 if (error) { 638 if (extended) { 639 (void)tmpfs_reg_resize(vp, oldsize, trivial); 640 kflags &= ~NOTE_EXTEND; 641 } 642 goto done; 643 } 644 645 TMPFS_NODE_LOCK(node); 646 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 647 (extended? TMPFS_NODE_CHANGED : 0); 648 649 if (node->tn_mode & (S_ISUID | S_ISGID)) { 650 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 651 node->tn_mode &= ~(S_ISUID | S_ISGID); 652 } 653 TMPFS_NODE_UNLOCK(node); 654 done: 655 656 tmpfs_knote(vp, kflags); 657 658 659 lwkt_reltoken(&vp->v_mount->mnt_token); 660 return(error); 661 } 662 663 static int 664 tmpfs_advlock (struct vop_advlock_args *ap) 665 { 666 struct tmpfs_node *node; 667 struct vnode *vp = ap->a_vp; 668 669 node = VP_TO_TMPFS_NODE(vp); 670 671 return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 672 } 673 674 static int 675 tmpfs_strategy(struct vop_strategy_args *ap) 676 { 677 struct bio *bio = ap->a_bio; 678 struct buf *bp = bio->bio_buf; 679 struct vnode *vp = ap->a_vp; 680 struct tmpfs_node *node; 681 vm_object_t uobj; 682 683 if (vp->v_type != VREG) { 684 bp->b_resid = bp->b_bcount; 685 bp->b_flags |= B_ERROR | B_INVAL; 686 bp->b_error = EINVAL; 687 biodone(bio); 688 return(0); 689 } 690 691 lwkt_gettoken(&vp->v_mount->mnt_token); 692 node = VP_TO_TMPFS_NODE(vp); 693 694 uobj = node->tn_reg.tn_aobj; 695 696 /* 697 * Call swap_pager_strategy to read or write between the VM 698 * object and the buffer cache. 699 */ 700 swap_pager_strategy(uobj, bio); 701 702 lwkt_reltoken(&vp->v_mount->mnt_token); 703 return 0; 704 } 705 706 static int 707 tmpfs_bmap(struct vop_bmap_args *ap) 708 { 709 if (ap->a_doffsetp != NULL) 710 *ap->a_doffsetp = ap->a_loffset; 711 if (ap->a_runp != NULL) 712 *ap->a_runp = 0; 713 if (ap->a_runb != NULL) 714 *ap->a_runb = 0; 715 716 return 0; 717 } 718 719 /* --------------------------------------------------------------------- */ 720 721 static int 722 tmpfs_nremove(struct vop_nremove_args *v) 723 { 724 struct vnode *dvp = v->a_dvp; 725 struct namecache *ncp = v->a_nch->ncp; 726 struct vnode *vp; 727 int error; 728 struct tmpfs_dirent *de; 729 struct tmpfs_mount *tmp; 730 struct tmpfs_node *dnode; 731 struct tmpfs_node *node; 732 733 /* 734 * We have to acquire the vp from v->a_nch because 735 * we will likely unresolve the namecache entry, and 736 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim 737 * sequence to recover space from the file. 738 */ 739 error = cache_vref(v->a_nch, v->a_cred, &vp); 740 KKASSERT(error == 0); 741 742 if (vp->v_type == VDIR) { 743 error = EISDIR; 744 goto out; 745 } 746 747 dnode = VP_TO_TMPFS_DIR(dvp); 748 node = VP_TO_TMPFS_NODE(vp); 749 tmp = VFS_TO_TMPFS(vp->v_mount); 750 de = tmpfs_dir_lookup(dnode, node, ncp); 751 if (de == NULL) { 752 error = ENOENT; 753 goto out; 754 } 755 756 /* Files marked as immutable or append-only cannot be deleted. */ 757 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 758 (dnode->tn_flags & APPEND)) { 759 error = EPERM; 760 goto out; 761 } 762 763 /* Remove the entry from the directory; as it is a file, we do not 764 * have to change the number of hard links of the directory. */ 765 tmpfs_dir_detach(dnode, de); 766 767 /* Free the directory entry we just deleted. Note that the node 768 * referred by it will not be removed until the vnode is really 769 * reclaimed. */ 770 tmpfs_free_dirent(tmp, de); 771 772 if (node->tn_links > 0) { 773 TMPFS_NODE_LOCK(node); 774 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 775 TMPFS_NODE_MODIFIED; 776 TMPFS_NODE_UNLOCK(node); 777 } 778 779 cache_setunresolved(v->a_nch); 780 cache_setvp(v->a_nch, NULL); 781 tmpfs_knote(vp, NOTE_DELETE); 782 /*cache_inval_vp(vp, CINV_DESTROY);*/ 783 tmpfs_knote(dvp, NOTE_WRITE); 784 error = 0; 785 786 out: 787 vrele(vp); 788 789 return error; 790 } 791 792 /* --------------------------------------------------------------------- */ 793 794 static int 795 tmpfs_nlink(struct vop_nlink_args *v) 796 { 797 struct vnode *dvp = v->a_dvp; 798 struct vnode *vp = v->a_vp; 799 struct namecache *ncp = v->a_nch->ncp; 800 struct tmpfs_dirent *de; 801 struct tmpfs_node *node; 802 struct tmpfs_node *dnode; 803 int error; 804 805 KKASSERT(dvp != vp); /* XXX When can this be false? */ 806 807 node = VP_TO_TMPFS_NODE(vp); 808 dnode = VP_TO_TMPFS_NODE(dvp); 809 810 /* XXX: Why aren't the following two tests done by the caller? */ 811 812 /* Hard links of directories are forbidden. */ 813 if (vp->v_type == VDIR) { 814 error = EPERM; 815 goto out; 816 } 817 818 /* Cannot create cross-device links. */ 819 if (dvp->v_mount != vp->v_mount) { 820 error = EXDEV; 821 goto out; 822 } 823 824 /* Ensure that we do not overflow the maximum number of links imposed 825 * by the system. */ 826 KKASSERT(node->tn_links <= LINK_MAX); 827 if (node->tn_links == LINK_MAX) { 828 error = EMLINK; 829 goto out; 830 } 831 832 /* We cannot create links of files marked immutable or append-only. */ 833 if (node->tn_flags & (IMMUTABLE | APPEND)) { 834 error = EPERM; 835 goto out; 836 } 837 838 /* Allocate a new directory entry to represent the node. */ 839 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 840 ncp->nc_name, ncp->nc_nlen, &de); 841 if (error != 0) 842 goto out; 843 844 /* Insert the new directory entry into the appropriate directory. */ 845 tmpfs_dir_attach(dnode, de); 846 847 /* vp link count has changed, so update node times. */ 848 849 TMPFS_NODE_LOCK(node); 850 node->tn_status |= TMPFS_NODE_CHANGED; 851 TMPFS_NODE_UNLOCK(node); 852 tmpfs_update(vp); 853 854 tmpfs_knote(vp, NOTE_LINK); 855 cache_setunresolved(v->a_nch); 856 cache_setvp(v->a_nch, vp); 857 tmpfs_knote(dvp, NOTE_WRITE); 858 error = 0; 859 860 out: 861 return error; 862 } 863 864 /* --------------------------------------------------------------------- */ 865 866 static int 867 tmpfs_nrename(struct vop_nrename_args *v) 868 { 869 struct vnode *fdvp = v->a_fdvp; 870 struct namecache *fncp = v->a_fnch->ncp; 871 struct vnode *fvp = fncp->nc_vp; 872 struct vnode *tdvp = v->a_tdvp; 873 struct namecache *tncp = v->a_tnch->ncp; 874 struct vnode *tvp = tncp->nc_vp; 875 struct tmpfs_dirent *de; 876 struct tmpfs_mount *tmp; 877 struct tmpfs_node *fdnode; 878 struct tmpfs_node *fnode; 879 struct tmpfs_node *tnode; 880 struct tmpfs_node *tdnode; 881 char *newname; 882 char *oldname; 883 int error; 884 885 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 886 887 /* Disallow cross-device renames. 888 * XXX Why isn't this done by the caller? */ 889 if (fvp->v_mount != tdvp->v_mount || 890 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 891 error = EXDEV; 892 goto out; 893 } 894 895 tmp = VFS_TO_TMPFS(tdvp->v_mount); 896 tdnode = VP_TO_TMPFS_DIR(tdvp); 897 898 /* If source and target are the same file, there is nothing to do. */ 899 if (fvp == tvp) { 900 error = 0; 901 goto out; 902 } 903 904 fdnode = VP_TO_TMPFS_DIR(fdvp); 905 fnode = VP_TO_TMPFS_NODE(fvp); 906 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 907 908 /* Avoid manipulating '.' and '..' entries. */ 909 if (de == NULL) { 910 error = ENOENT; 911 goto out_locked; 912 } 913 KKASSERT(de->td_node == fnode); 914 915 /* 916 * If replacing an entry in the target directory and that entry 917 * is a directory, it must be empty. 918 * 919 * Kern_rename gurantees the destination to be a directory 920 * if the source is one (it does?). 921 */ 922 if (tvp != NULL) { 923 KKASSERT(tnode != NULL); 924 925 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 926 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 927 error = EPERM; 928 goto out_locked; 929 } 930 931 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 932 if (tnode->tn_size > 0) { 933 error = ENOTEMPTY; 934 goto out_locked; 935 } 936 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 937 error = ENOTDIR; 938 goto out_locked; 939 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 940 error = EISDIR; 941 goto out_locked; 942 } else { 943 KKASSERT(fnode->tn_type != VDIR && 944 tnode->tn_type != VDIR); 945 } 946 } 947 948 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 949 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 950 error = EPERM; 951 goto out_locked; 952 } 953 954 /* 955 * Ensure that we have enough memory to hold the new name, if it 956 * has to be changed. 957 */ 958 if (fncp->nc_nlen != tncp->nc_nlen || 959 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 960 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 961 M_WAITOK | M_NULLOK); 962 if (newname == NULL) { 963 error = ENOSPC; 964 goto out_locked; 965 } 966 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 967 newname[tncp->nc_nlen] = '\0'; 968 } else { 969 newname = NULL; 970 } 971 972 /* 973 * Unlink entry from source directory. Note that the kernel has 974 * already checked for illegal recursion cases (renaming a directory 975 * into a subdirectory of itself). 976 */ 977 if (fdnode != tdnode) 978 tmpfs_dir_detach(fdnode, de); 979 980 /* 981 * Handle any name change. Swap with newname, we will 982 * deallocate it at the end. 983 */ 984 if (newname != NULL) { 985 #if 0 986 TMPFS_NODE_LOCK(fnode); 987 fnode->tn_status |= TMPFS_NODE_CHANGED; 988 TMPFS_NODE_UNLOCK(fnode); 989 #endif 990 oldname = de->td_name; 991 de->td_name = newname; 992 de->td_namelen = (uint16_t)tncp->nc_nlen; 993 newname = oldname; 994 } 995 996 /* 997 * Link entry to target directory. If the entry 998 * represents a directory move the parent linkage 999 * as well. 1000 */ 1001 if (fdnode != tdnode) { 1002 if (de->td_node->tn_type == VDIR) { 1003 TMPFS_VALIDATE_DIR(fnode); 1004 1005 TMPFS_NODE_LOCK(tdnode); 1006 tdnode->tn_links++; 1007 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1008 TMPFS_NODE_UNLOCK(tdnode); 1009 1010 TMPFS_NODE_LOCK(fnode); 1011 fnode->tn_dir.tn_parent = tdnode; 1012 fnode->tn_status |= TMPFS_NODE_CHANGED; 1013 TMPFS_NODE_UNLOCK(fnode); 1014 1015 TMPFS_NODE_LOCK(fdnode); 1016 fdnode->tn_links--; 1017 fdnode->tn_status |= TMPFS_NODE_MODIFIED; 1018 TMPFS_NODE_UNLOCK(fdnode); 1019 } 1020 tmpfs_dir_attach(tdnode, de); 1021 } else { 1022 TMPFS_NODE_LOCK(tdnode); 1023 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1024 TMPFS_NODE_UNLOCK(tdnode); 1025 } 1026 1027 /* 1028 * If we are overwriting an entry, we have to remove the old one 1029 * from the target directory. 1030 */ 1031 if (tvp != NULL) { 1032 /* Remove the old entry from the target directory. */ 1033 de = tmpfs_dir_lookup(tdnode, tnode, tncp); 1034 tmpfs_dir_detach(tdnode, de); 1035 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1036 1037 /* 1038 * Free the directory entry we just deleted. Note that the 1039 * node referred by it will not be removed until the vnode is 1040 * really reclaimed. 1041 */ 1042 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de); 1043 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1044 } 1045 1046 /* 1047 * Finish up 1048 */ 1049 if (newname) { 1050 kfree(newname, tmp->tm_name_zone); 1051 newname = NULL; 1052 } 1053 cache_rename(v->a_fnch, v->a_tnch); 1054 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1055 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1056 if (fnode->tn_vnode) 1057 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1058 error = 0; 1059 1060 out_locked: 1061 ; 1062 1063 out: 1064 /* Release target nodes. */ 1065 /* XXX: I don't understand when tdvp can be the same as tvp, but 1066 * other code takes care of this... */ 1067 if (tdvp == tvp) 1068 vrele(tdvp); 1069 1070 return error; 1071 } 1072 1073 /* --------------------------------------------------------------------- */ 1074 1075 static int 1076 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1077 { 1078 struct vnode *dvp = v->a_dvp; 1079 struct vnode **vpp = v->a_vpp; 1080 struct namecache *ncp = v->a_nch->ncp; 1081 struct vattr *vap = v->a_vap; 1082 struct ucred *cred = v->a_cred; 1083 int error; 1084 1085 KKASSERT(vap->va_type == VDIR); 1086 1087 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1088 if (error == 0) { 1089 cache_setunresolved(v->a_nch); 1090 cache_setvp(v->a_nch, *vpp); 1091 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1092 } 1093 1094 return error; 1095 } 1096 1097 /* --------------------------------------------------------------------- */ 1098 1099 static int 1100 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1101 { 1102 struct vnode *dvp = v->a_dvp; 1103 struct namecache *ncp = v->a_nch->ncp; 1104 struct vnode *vp; 1105 struct tmpfs_dirent *de; 1106 struct tmpfs_mount *tmp; 1107 struct tmpfs_node *dnode; 1108 struct tmpfs_node *node; 1109 int error; 1110 1111 /* 1112 * We have to acquire the vp from v->a_nch because 1113 * we will likely unresolve the namecache entry, and 1114 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim 1115 * sequence. 1116 */ 1117 error = cache_vref(v->a_nch, v->a_cred, &vp); 1118 KKASSERT(error == 0); 1119 1120 /* 1121 * Prevalidate so we don't hit an assertion later 1122 */ 1123 if (vp->v_type != VDIR) { 1124 error = ENOTDIR; 1125 goto out; 1126 } 1127 1128 tmp = VFS_TO_TMPFS(dvp->v_mount); 1129 dnode = VP_TO_TMPFS_DIR(dvp); 1130 node = VP_TO_TMPFS_DIR(vp); 1131 1132 /* Directories with more than two entries ('.' and '..') cannot be 1133 * removed. */ 1134 if (node->tn_size > 0) { 1135 error = ENOTEMPTY; 1136 goto out; 1137 } 1138 1139 if ((dnode->tn_flags & APPEND) 1140 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1141 error = EPERM; 1142 goto out; 1143 } 1144 1145 /* This invariant holds only if we are not trying to remove "..". 1146 * We checked for that above so this is safe now. */ 1147 KKASSERT(node->tn_dir.tn_parent == dnode); 1148 1149 /* Get the directory entry associated with node (vp). This was 1150 * filled by tmpfs_lookup while looking up the entry. */ 1151 de = tmpfs_dir_lookup(dnode, node, ncp); 1152 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1153 ncp->nc_name, 1154 ncp->nc_nlen)); 1155 1156 /* Check flags to see if we are allowed to remove the directory. */ 1157 if ((dnode->tn_flags & APPEND) || 1158 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1159 error = EPERM; 1160 goto out; 1161 } 1162 1163 1164 /* Detach the directory entry from the directory (dnode). */ 1165 tmpfs_dir_detach(dnode, de); 1166 1167 /* No vnode should be allocated for this entry from this point */ 1168 TMPFS_NODE_LOCK(node); 1169 TMPFS_ASSERT_ELOCKED(node); 1170 TMPFS_NODE_LOCK(dnode); 1171 TMPFS_ASSERT_ELOCKED(dnode); 1172 1173 #if 0 1174 /* handled by tmpfs_free_node */ 1175 KKASSERT(node->tn_links > 0); 1176 node->tn_links--; 1177 node->tn_dir.tn_parent = NULL; 1178 #endif 1179 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1180 TMPFS_NODE_MODIFIED; 1181 1182 #if 0 1183 /* handled by tmpfs_free_node */ 1184 KKASSERT(dnode->tn_links > 0); 1185 dnode->tn_links--; 1186 #endif 1187 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1188 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1189 1190 TMPFS_NODE_UNLOCK(dnode); 1191 TMPFS_NODE_UNLOCK(node); 1192 1193 /* Free the directory entry we just deleted. Note that the node 1194 * referred by it will not be removed until the vnode is really 1195 * reclaimed. */ 1196 tmpfs_free_dirent(tmp, de); 1197 1198 /* Release the deleted vnode (will destroy the node, notify 1199 * interested parties and clean it from the cache). */ 1200 1201 TMPFS_NODE_LOCK(dnode); 1202 dnode->tn_status |= TMPFS_NODE_CHANGED; 1203 TMPFS_NODE_UNLOCK(dnode); 1204 tmpfs_update(dvp); 1205 1206 cache_setunresolved(v->a_nch); 1207 cache_setvp(v->a_nch, NULL); 1208 /*cache_inval_vp(vp, CINV_DESTROY);*/ 1209 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1210 error = 0; 1211 1212 out: 1213 vrele(vp); 1214 1215 return error; 1216 } 1217 1218 /* --------------------------------------------------------------------- */ 1219 1220 static int 1221 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1222 { 1223 struct vnode *dvp = v->a_dvp; 1224 struct vnode **vpp = v->a_vpp; 1225 struct namecache *ncp = v->a_nch->ncp; 1226 struct vattr *vap = v->a_vap; 1227 struct ucred *cred = v->a_cred; 1228 char *target = v->a_target; 1229 int error; 1230 1231 vap->va_type = VLNK; 1232 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1233 if (error == 0) { 1234 tmpfs_knote(*vpp, NOTE_WRITE); 1235 cache_setunresolved(v->a_nch); 1236 cache_setvp(v->a_nch, *vpp); 1237 } 1238 1239 return error; 1240 } 1241 1242 /* --------------------------------------------------------------------- */ 1243 1244 static int 1245 tmpfs_readdir(struct vop_readdir_args *v) 1246 { 1247 struct vnode *vp = v->a_vp; 1248 struct uio *uio = v->a_uio; 1249 int *eofflag = v->a_eofflag; 1250 off_t **cookies = v->a_cookies; 1251 int *ncookies = v->a_ncookies; 1252 struct tmpfs_mount *tmp; 1253 int error; 1254 off_t startoff; 1255 off_t cnt = 0; 1256 struct tmpfs_node *node; 1257 1258 /* This operation only makes sense on directory nodes. */ 1259 if (vp->v_type != VDIR) 1260 return ENOTDIR; 1261 1262 tmp = VFS_TO_TMPFS(vp->v_mount); 1263 node = VP_TO_TMPFS_DIR(vp); 1264 startoff = uio->uio_offset; 1265 1266 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1267 error = tmpfs_dir_getdotdent(node, uio); 1268 if (error != 0) 1269 goto outok; 1270 cnt++; 1271 } 1272 1273 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1274 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1275 if (error != 0) 1276 goto outok; 1277 cnt++; 1278 } 1279 1280 error = tmpfs_dir_getdents(node, uio, &cnt); 1281 1282 outok: 1283 KKASSERT(error >= -1); 1284 1285 if (error == -1) 1286 error = 0; 1287 1288 if (eofflag != NULL) 1289 *eofflag = 1290 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1291 1292 /* Update NFS-related variables. */ 1293 if (error == 0 && cookies != NULL && ncookies != NULL) { 1294 off_t i; 1295 off_t off = startoff; 1296 struct tmpfs_dirent *de = NULL; 1297 1298 *ncookies = cnt; 1299 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1300 1301 for (i = 0; i < cnt; i++) { 1302 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1303 if (off == TMPFS_DIRCOOKIE_DOT) { 1304 off = TMPFS_DIRCOOKIE_DOTDOT; 1305 } else { 1306 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1307 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1308 } else if (de != NULL) { 1309 de = TAILQ_NEXT(de, td_entries); 1310 } else { 1311 de = tmpfs_dir_lookupbycookie(node, 1312 off); 1313 KKASSERT(de != NULL); 1314 de = TAILQ_NEXT(de, td_entries); 1315 } 1316 if (de == NULL) 1317 off = TMPFS_DIRCOOKIE_EOF; 1318 else 1319 off = tmpfs_dircookie(de); 1320 } 1321 1322 (*cookies)[i] = off; 1323 } 1324 KKASSERT(uio->uio_offset == off); 1325 } 1326 1327 return error; 1328 } 1329 1330 /* --------------------------------------------------------------------- */ 1331 1332 static int 1333 tmpfs_readlink(struct vop_readlink_args *v) 1334 { 1335 struct vnode *vp = v->a_vp; 1336 struct uio *uio = v->a_uio; 1337 1338 int error; 1339 struct tmpfs_node *node; 1340 1341 KKASSERT(uio->uio_offset == 0); 1342 KKASSERT(vp->v_type == VLNK); 1343 1344 node = VP_TO_TMPFS_NODE(vp); 1345 1346 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1347 uio); 1348 TMPFS_NODE_LOCK(node); 1349 node->tn_status |= TMPFS_NODE_ACCESSED; 1350 TMPFS_NODE_UNLOCK(node); 1351 1352 return error; 1353 } 1354 1355 /* --------------------------------------------------------------------- */ 1356 1357 static int 1358 tmpfs_inactive(struct vop_inactive_args *v) 1359 { 1360 struct vnode *vp = v->a_vp; 1361 1362 struct tmpfs_node *node; 1363 1364 node = VP_TO_TMPFS_NODE(vp); 1365 1366 /* 1367 * Get rid of unreferenced deleted vnodes sooner rather than 1368 * later so the data memory can be recovered immediately. 1369 * 1370 * We must truncate the vnode to prevent the normal reclamation 1371 * path from flushing the data for the removed file to disk. 1372 */ 1373 TMPFS_NODE_LOCK(node); 1374 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1375 (node->tn_links == 0 || 1376 (node->tn_links == 1 && node->tn_type == VDIR && 1377 node->tn_dir.tn_parent))) 1378 { 1379 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1380 TMPFS_NODE_UNLOCK(node); 1381 if (node->tn_type == VREG) 1382 tmpfs_truncate(vp, 0); 1383 vrecycle(vp); 1384 } else { 1385 TMPFS_NODE_UNLOCK(node); 1386 } 1387 1388 return 0; 1389 } 1390 1391 /* --------------------------------------------------------------------- */ 1392 1393 int 1394 tmpfs_reclaim(struct vop_reclaim_args *v) 1395 { 1396 struct vnode *vp = v->a_vp; 1397 struct tmpfs_mount *tmp; 1398 struct tmpfs_node *node; 1399 1400 node = VP_TO_TMPFS_NODE(vp); 1401 tmp = VFS_TO_TMPFS(vp->v_mount); 1402 1403 tmpfs_free_vp(vp); 1404 1405 /* 1406 * If the node referenced by this vnode was deleted by the 1407 * user, we must free its associated data structures now that 1408 * the vnode is being reclaimed. 1409 * 1410 * Directories have an extra link ref. 1411 */ 1412 TMPFS_NODE_LOCK(node); 1413 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1414 (node->tn_links == 0 || 1415 (node->tn_links == 1 && node->tn_type == VDIR && 1416 node->tn_dir.tn_parent))) 1417 { 1418 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1419 tmpfs_free_node(tmp, node); 1420 /* eats the lock */ 1421 } else { 1422 TMPFS_NODE_UNLOCK(node); 1423 } 1424 1425 KKASSERT(vp->v_data == NULL); 1426 return 0; 1427 } 1428 1429 /* --------------------------------------------------------------------- */ 1430 1431 static int 1432 tmpfs_print(struct vop_print_args *v) 1433 { 1434 struct vnode *vp = v->a_vp; 1435 1436 struct tmpfs_node *node; 1437 1438 node = VP_TO_TMPFS_NODE(vp); 1439 1440 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1441 node, node->tn_flags, node->tn_links); 1442 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1443 node->tn_mode, node->tn_uid, node->tn_gid, 1444 (uintmax_t)node->tn_size, node->tn_status); 1445 1446 if (vp->v_type == VFIFO) 1447 fifo_printinfo(vp); 1448 1449 kprintf("\n"); 1450 1451 return 0; 1452 } 1453 1454 /* --------------------------------------------------------------------- */ 1455 1456 static int 1457 tmpfs_pathconf(struct vop_pathconf_args *v) 1458 { 1459 int name = v->a_name; 1460 register_t *retval = v->a_retval; 1461 1462 int error; 1463 1464 error = 0; 1465 1466 switch (name) { 1467 case _PC_LINK_MAX: 1468 *retval = LINK_MAX; 1469 break; 1470 1471 case _PC_NAME_MAX: 1472 *retval = NAME_MAX; 1473 break; 1474 1475 case _PC_PATH_MAX: 1476 *retval = PATH_MAX; 1477 break; 1478 1479 case _PC_PIPE_BUF: 1480 *retval = PIPE_BUF; 1481 break; 1482 1483 case _PC_CHOWN_RESTRICTED: 1484 *retval = 1; 1485 break; 1486 1487 case _PC_NO_TRUNC: 1488 *retval = 1; 1489 break; 1490 1491 case _PC_SYNC_IO: 1492 *retval = 1; 1493 break; 1494 1495 case _PC_FILESIZEBITS: 1496 *retval = 0; /* XXX Don't know which value should I return. */ 1497 break; 1498 1499 default: 1500 error = EINVAL; 1501 } 1502 1503 return error; 1504 } 1505 1506 /************************************************************************ 1507 * KQFILTER OPS * 1508 ************************************************************************/ 1509 1510 static void filt_tmpfsdetach(struct knote *kn); 1511 static int filt_tmpfsread(struct knote *kn, long hint); 1512 static int filt_tmpfswrite(struct knote *kn, long hint); 1513 static int filt_tmpfsvnode(struct knote *kn, long hint); 1514 1515 static struct filterops tmpfsread_filtops = 1516 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1517 static struct filterops tmpfswrite_filtops = 1518 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1519 static struct filterops tmpfsvnode_filtops = 1520 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1521 1522 static int 1523 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1524 { 1525 struct vnode *vp = ap->a_vp; 1526 struct knote *kn = ap->a_kn; 1527 1528 switch (kn->kn_filter) { 1529 case EVFILT_READ: 1530 kn->kn_fop = &tmpfsread_filtops; 1531 break; 1532 case EVFILT_WRITE: 1533 kn->kn_fop = &tmpfswrite_filtops; 1534 break; 1535 case EVFILT_VNODE: 1536 kn->kn_fop = &tmpfsvnode_filtops; 1537 break; 1538 default: 1539 return (EOPNOTSUPP); 1540 } 1541 1542 kn->kn_hook = (caddr_t)vp; 1543 1544 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1545 1546 return(0); 1547 } 1548 1549 static void 1550 filt_tmpfsdetach(struct knote *kn) 1551 { 1552 struct vnode *vp = (void *)kn->kn_hook; 1553 1554 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1555 } 1556 1557 static int 1558 filt_tmpfsread(struct knote *kn, long hint) 1559 { 1560 struct vnode *vp = (void *)kn->kn_hook; 1561 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1562 off_t off; 1563 1564 if (hint == NOTE_REVOKE) { 1565 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 1566 return(1); 1567 } 1568 off = node->tn_size - kn->kn_fp->f_offset; 1569 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1570 if (kn->kn_sfflags & NOTE_OLDAPI) 1571 return(1); 1572 1573 /* 1574 * Handle possible MP race interlock on filter check/write 1575 */ 1576 if (kn->kn_data == 0) { 1577 get_mplock(); 1578 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1579 rel_mplock(); 1580 } 1581 return (kn->kn_data != 0); 1582 } 1583 1584 static int 1585 filt_tmpfswrite(struct knote *kn, long hint) 1586 { 1587 if (hint == NOTE_REVOKE) 1588 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 1589 kn->kn_data = 0; 1590 return (1); 1591 } 1592 1593 static int 1594 filt_tmpfsvnode(struct knote *kn, long hint) 1595 { 1596 if (kn->kn_sfflags & hint) 1597 kn->kn_fflags |= hint; 1598 if (hint == NOTE_REVOKE) { 1599 kn->kn_flags |= EV_EOF; 1600 return (1); 1601 } 1602 return (kn->kn_fflags != 0); 1603 } 1604 1605 1606 /* --------------------------------------------------------------------- */ 1607 1608 /* 1609 * vnode operations vector used for files stored in a tmpfs file system. 1610 */ 1611 struct vop_ops tmpfs_vnode_vops = { 1612 .vop_default = vop_defaultop, 1613 .vop_getpages = vop_stdgetpages, 1614 .vop_putpages = vop_stdputpages, 1615 .vop_ncreate = tmpfs_ncreate, 1616 .vop_nresolve = tmpfs_nresolve, 1617 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1618 .vop_nmknod = tmpfs_nmknod, 1619 .vop_open = tmpfs_open, 1620 .vop_close = tmpfs_close, 1621 .vop_access = tmpfs_access, 1622 .vop_getattr = tmpfs_getattr, 1623 .vop_setattr = tmpfs_setattr, 1624 .vop_read = tmpfs_read, 1625 .vop_write = tmpfs_write, 1626 .vop_fsync = tmpfs_fsync, 1627 .vop_nremove = tmpfs_nremove, 1628 .vop_nlink = tmpfs_nlink, 1629 .vop_nrename = tmpfs_nrename, 1630 .vop_nmkdir = tmpfs_nmkdir, 1631 .vop_nrmdir = tmpfs_nrmdir, 1632 .vop_nsymlink = tmpfs_nsymlink, 1633 .vop_readdir = tmpfs_readdir, 1634 .vop_readlink = tmpfs_readlink, 1635 .vop_inactive = tmpfs_inactive, 1636 .vop_reclaim = tmpfs_reclaim, 1637 .vop_print = tmpfs_print, 1638 .vop_pathconf = tmpfs_pathconf, 1639 .vop_bmap = tmpfs_bmap, 1640 .vop_strategy = tmpfs_strategy, 1641 .vop_advlock = tmpfs_advlock, 1642 .vop_kqfilter = tmpfs_kqfilter 1643 }; 1644