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