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 #include <sys/mountctl.h> 52 53 #include <vm/vm.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_page.h> 56 #include <vm/vm_pager.h> 57 #include <vm/swap_pager.h> 58 59 #include <sys/buf2.h> 60 61 #include <vfs/fifofs/fifo.h> 62 #include <vfs/tmpfs/tmpfs_vnops.h> 63 #include <vfs/tmpfs/tmpfs.h> 64 65 MALLOC_DECLARE(M_TMPFS); 66 67 static void tmpfs_strategy_done(struct bio *bio); 68 69 static __inline 70 void 71 tmpfs_knote(struct vnode *vp, int flags) 72 { 73 if (flags) 74 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 75 } 76 77 78 /* --------------------------------------------------------------------- */ 79 80 static int 81 tmpfs_nresolve(struct vop_nresolve_args *v) 82 { 83 struct vnode *dvp = v->a_dvp; 84 struct vnode *vp = NULL; 85 struct namecache *ncp = v->a_nch->ncp; 86 struct tmpfs_node *tnode; 87 88 int error; 89 struct tmpfs_dirent *de; 90 struct tmpfs_node *dnode; 91 92 dnode = VP_TO_TMPFS_DIR(dvp); 93 94 de = tmpfs_dir_lookup(dnode, NULL, ncp); 95 if (de == NULL) { 96 error = ENOENT; 97 } else { 98 /* 99 * Allocate a vnode for the node we found. 100 */ 101 tnode = de->td_node; 102 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 103 LK_EXCLUSIVE | LK_RETRY, &vp); 104 if (error) 105 goto out; 106 KKASSERT(vp); 107 } 108 109 out: 110 /* 111 * Store the result of this lookup in the cache. Avoid this if the 112 * request was for creation, as it does not improve timings on 113 * emprical tests. 114 */ 115 if (vp) { 116 vn_unlock(vp); 117 cache_setvp(v->a_nch, vp); 118 vrele(vp); 119 } else if (error == ENOENT) { 120 cache_setvp(v->a_nch, NULL); 121 } 122 return error; 123 } 124 125 static int 126 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) 127 { 128 struct vnode *dvp = v->a_dvp; 129 struct vnode **vpp = v->a_vpp; 130 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); 131 struct ucred *cred = v->a_cred; 132 int error; 133 134 *vpp = NULL; 135 /* Check accessibility of requested node as a first step. */ 136 error = VOP_ACCESS(dvp, VEXEC, cred); 137 if (error != 0) 138 return error; 139 140 if (dnode->tn_dir.tn_parent != NULL) { 141 /* Allocate a new vnode on the matching entry. */ 142 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 143 LK_EXCLUSIVE | LK_RETRY, vpp); 144 145 if (*vpp) 146 vn_unlock(*vpp); 147 } 148 149 return (*vpp == NULL) ? ENOENT : 0; 150 } 151 152 /* --------------------------------------------------------------------- */ 153 154 static int 155 tmpfs_ncreate(struct vop_ncreate_args *v) 156 { 157 struct vnode *dvp = v->a_dvp; 158 struct vnode **vpp = v->a_vpp; 159 struct namecache *ncp = v->a_nch->ncp; 160 struct vattr *vap = v->a_vap; 161 struct ucred *cred = v->a_cred; 162 int error; 163 164 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 165 166 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 167 if (error == 0) { 168 cache_setunresolved(v->a_nch); 169 cache_setvp(v->a_nch, *vpp); 170 tmpfs_knote(dvp, NOTE_WRITE); 171 } 172 173 return error; 174 } 175 /* --------------------------------------------------------------------- */ 176 177 static int 178 tmpfs_nmknod(struct vop_nmknod_args *v) 179 { 180 struct vnode *dvp = v->a_dvp; 181 struct vnode **vpp = v->a_vpp; 182 struct namecache *ncp = v->a_nch->ncp; 183 struct vattr *vap = v->a_vap; 184 struct ucred *cred = v->a_cred; 185 int error; 186 187 if (vap->va_type != VBLK && vap->va_type != VCHR && 188 vap->va_type != VFIFO) 189 return EINVAL; 190 191 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 192 if (error == 0) { 193 cache_setunresolved(v->a_nch); 194 cache_setvp(v->a_nch, *vpp); 195 tmpfs_knote(dvp, NOTE_WRITE); 196 } 197 198 return error; 199 } 200 201 /* --------------------------------------------------------------------- */ 202 203 static int 204 tmpfs_open(struct vop_open_args *v) 205 { 206 struct vnode *vp = v->a_vp; 207 int mode = v->a_mode; 208 209 int error; 210 struct tmpfs_node *node; 211 212 node = VP_TO_TMPFS_NODE(vp); 213 214 /* The file is still active but all its names have been removed 215 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 216 * it is about to die. */ 217 if (node->tn_links < 1) 218 return (ENOENT); 219 220 /* If the file is marked append-only, deny write requests. */ 221 if ((node->tn_flags & APPEND) && 222 (mode & (FWRITE | O_APPEND)) == FWRITE) { 223 error = EPERM; 224 } else { 225 return (vop_stdopen(v)); 226 } 227 return error; 228 } 229 230 /* --------------------------------------------------------------------- */ 231 232 static int 233 tmpfs_close(struct vop_close_args *v) 234 { 235 struct vnode *vp = v->a_vp; 236 struct tmpfs_node *node; 237 238 node = VP_TO_TMPFS_NODE(vp); 239 240 if (node->tn_links > 0) { 241 /* Update node times. No need to do it if the node has 242 * been deleted, because it will vanish after we return. */ 243 tmpfs_update(vp); 244 } 245 246 return vop_stdclose(v); 247 } 248 249 /* --------------------------------------------------------------------- */ 250 251 int 252 tmpfs_access(struct vop_access_args *v) 253 { 254 struct vnode *vp = v->a_vp; 255 int error; 256 struct tmpfs_node *node; 257 258 node = VP_TO_TMPFS_NODE(vp); 259 260 switch (vp->v_type) { 261 case VDIR: 262 /* FALLTHROUGH */ 263 case VLNK: 264 /* FALLTHROUGH */ 265 case VREG: 266 if ((v->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 267 error = EROFS; 268 goto out; 269 } 270 break; 271 272 case VBLK: 273 /* FALLTHROUGH */ 274 case VCHR: 275 /* FALLTHROUGH */ 276 case VSOCK: 277 /* FALLTHROUGH */ 278 case VFIFO: 279 break; 280 281 default: 282 error = EINVAL; 283 goto out; 284 } 285 286 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 287 error = EPERM; 288 goto out; 289 } 290 291 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0); 292 293 out: 294 295 return error; 296 } 297 298 /* --------------------------------------------------------------------- */ 299 300 int 301 tmpfs_getattr(struct vop_getattr_args *v) 302 { 303 struct vnode *vp = v->a_vp; 304 struct vattr *vap = v->a_vap; 305 struct tmpfs_node *node; 306 307 node = VP_TO_TMPFS_NODE(vp); 308 309 lwkt_gettoken(&vp->v_mount->mnt_token); 310 tmpfs_update(vp); 311 312 vap->va_type = vp->v_type; 313 vap->va_mode = node->tn_mode; 314 vap->va_nlink = node->tn_links; 315 vap->va_uid = node->tn_uid; 316 vap->va_gid = node->tn_gid; 317 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 318 vap->va_fileid = node->tn_id; 319 vap->va_size = node->tn_size; 320 vap->va_blocksize = PAGE_SIZE; 321 vap->va_atime.tv_sec = node->tn_atime; 322 vap->va_atime.tv_nsec = node->tn_atimensec; 323 vap->va_mtime.tv_sec = node->tn_mtime; 324 vap->va_mtime.tv_nsec = node->tn_mtimensec; 325 vap->va_ctime.tv_sec = node->tn_ctime; 326 vap->va_ctime.tv_nsec = node->tn_ctimensec; 327 vap->va_gen = node->tn_gen; 328 vap->va_flags = node->tn_flags; 329 if (vp->v_type == VBLK || vp->v_type == VCHR) 330 { 331 vap->va_rmajor = umajor(node->tn_rdev); 332 vap->va_rminor = uminor(node->tn_rdev); 333 } 334 vap->va_bytes = round_page(node->tn_size); 335 vap->va_filerev = 0; 336 337 lwkt_reltoken(&vp->v_mount->mnt_token); 338 339 return 0; 340 } 341 342 /* --------------------------------------------------------------------- */ 343 344 int 345 tmpfs_setattr(struct vop_setattr_args *v) 346 { 347 struct vnode *vp = v->a_vp; 348 struct vattr *vap = v->a_vap; 349 struct ucred *cred = v->a_cred; 350 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 351 int error = 0; 352 int kflags = 0; 353 354 if (error == 0 && (vap->va_flags != VNOVAL)) { 355 error = tmpfs_chflags(vp, vap->va_flags, cred); 356 kflags |= NOTE_ATTRIB; 357 } 358 359 if (error == 0 && (vap->va_size != VNOVAL)) { 360 if (vap->va_size > node->tn_size) 361 kflags |= NOTE_WRITE | NOTE_EXTEND; 362 else 363 kflags |= NOTE_WRITE; 364 error = tmpfs_chsize(vp, vap->va_size, cred); 365 } 366 367 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 368 vap->va_gid != (gid_t)VNOVAL)) { 369 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 370 kflags |= NOTE_ATTRIB; 371 } 372 373 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 374 error = tmpfs_chmod(vp, vap->va_mode, cred); 375 kflags |= NOTE_ATTRIB; 376 } 377 378 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 379 vap->va_atime.tv_nsec != VNOVAL) || 380 (vap->va_mtime.tv_sec != VNOVAL && 381 vap->va_mtime.tv_nsec != VNOVAL) )) { 382 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 383 vap->va_vaflags, cred); 384 kflags |= NOTE_ATTRIB; 385 } 386 387 /* Update the node times. We give preference to the error codes 388 * generated by this function rather than the ones that may arise 389 * from tmpfs_update. */ 390 tmpfs_update(vp); 391 tmpfs_knote(vp, kflags); 392 393 return error; 394 } 395 396 /* --------------------------------------------------------------------- */ 397 398 /* 399 * fsync is usually a NOP, but we must take action when unmounting or 400 * when recycling. 401 */ 402 static int 403 tmpfs_fsync(struct vop_fsync_args *v) 404 { 405 struct tmpfs_mount *tmp; 406 struct tmpfs_node *node; 407 struct vnode *vp = v->a_vp; 408 409 tmp = VFS_TO_TMPFS(vp->v_mount); 410 node = VP_TO_TMPFS_NODE(vp); 411 412 tmpfs_update(vp); 413 if (vp->v_type == VREG) { 414 if (vp->v_flag & VRECLAIMED) { 415 if (node->tn_links == 0) 416 tmpfs_truncate(vp, 0); 417 else 418 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); 419 } 420 } 421 return 0; 422 } 423 424 /* --------------------------------------------------------------------- */ 425 426 static int 427 tmpfs_read (struct vop_read_args *ap) 428 { 429 struct buf *bp; 430 struct vnode *vp = ap->a_vp; 431 struct uio *uio = ap->a_uio; 432 struct tmpfs_node *node; 433 off_t base_offset; 434 size_t offset; 435 size_t len; 436 int error; 437 438 error = 0; 439 if (uio->uio_resid == 0) { 440 return error; 441 } 442 443 node = VP_TO_TMPFS_NODE(vp); 444 445 if (uio->uio_offset < 0) 446 return (EINVAL); 447 if (vp->v_type != VREG) 448 return (EINVAL); 449 450 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 451 /* 452 * Use buffer cache I/O (via tmpfs_strategy) 453 */ 454 offset = (size_t)uio->uio_offset & BMASK; 455 base_offset = (off_t)uio->uio_offset - offset; 456 bp = getcacheblk(vp, base_offset, BSIZE, 0); 457 if (bp == NULL) { 458 lwkt_gettoken(&vp->v_mount->mnt_token); 459 error = bread(vp, base_offset, BSIZE, &bp); 460 if (error) { 461 brelse(bp); 462 lwkt_reltoken(&vp->v_mount->mnt_token); 463 kprintf("tmpfs_read bread error %d\n", error); 464 break; 465 } 466 lwkt_reltoken(&vp->v_mount->mnt_token); 467 } 468 469 /* 470 * Figure out how many bytes we can actually copy this loop. 471 */ 472 len = BSIZE - offset; 473 if (len > uio->uio_resid) 474 len = uio->uio_resid; 475 if (len > node->tn_size - uio->uio_offset) 476 len = (size_t)(node->tn_size - uio->uio_offset); 477 478 error = uiomove((char *)bp->b_data + offset, len, uio); 479 bqrelse(bp); 480 if (error) { 481 kprintf("tmpfs_read uiomove error %d\n", error); 482 break; 483 } 484 } 485 486 TMPFS_NODE_LOCK(node); 487 node->tn_status |= TMPFS_NODE_ACCESSED; 488 TMPFS_NODE_UNLOCK(node); 489 490 return(error); 491 } 492 493 static int 494 tmpfs_write (struct vop_write_args *ap) 495 { 496 struct buf *bp; 497 struct vnode *vp = ap->a_vp; 498 struct uio *uio = ap->a_uio; 499 struct thread *td = uio->uio_td; 500 struct tmpfs_node *node; 501 boolean_t extended; 502 off_t oldsize; 503 int error; 504 off_t base_offset; 505 size_t offset; 506 size_t len; 507 struct rlimit limit; 508 int trivial = 0; 509 int kflags = 0; 510 511 error = 0; 512 if (uio->uio_resid == 0) { 513 return error; 514 } 515 516 node = VP_TO_TMPFS_NODE(vp); 517 518 if (vp->v_type != VREG) 519 return (EINVAL); 520 521 lwkt_gettoken(&vp->v_mount->mnt_token); 522 523 oldsize = node->tn_size; 524 if (ap->a_ioflag & IO_APPEND) 525 uio->uio_offset = node->tn_size; 526 527 /* 528 * Check for illegal write offsets. 529 */ 530 if (uio->uio_offset + uio->uio_resid > 531 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 532 lwkt_reltoken(&vp->v_mount->mnt_token); 533 return (EFBIG); 534 } 535 536 if (vp->v_type == VREG && td != NULL) { 537 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 538 if (error != 0) { 539 lwkt_reltoken(&vp->v_mount->mnt_token); 540 return error; 541 } 542 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 543 ksignal(td->td_proc, SIGXFSZ); 544 lwkt_reltoken(&vp->v_mount->mnt_token); 545 return (EFBIG); 546 } 547 } 548 549 550 /* 551 * Extend the file's size if necessary 552 */ 553 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 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 * Always try to flush the page if the request is coming 597 * from the pageout daemon (IO_ASYNC), else buwrite() the 598 * buffer. 599 * 600 * buwrite() dirties the underlying VM pages instead of 601 * dirtying the buffer, releasing the buffer as a clean 602 * buffer. This allows tmpfs to use essentially all 603 * available memory to cache file data. If we used bdwrite() 604 * the buffer cache would wind up flushing the data to 605 * swap too quickly. 606 */ 607 bp->b_flags |= B_AGE; 608 if (ap->a_ioflag & IO_ASYNC) { 609 bawrite(bp); 610 } else { 611 buwrite(bp); 612 } 613 614 if (bp->b_error) { 615 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 616 break; 617 } 618 } 619 620 if (error) { 621 if (extended) { 622 (void)tmpfs_reg_resize(vp, oldsize, trivial); 623 kflags &= ~NOTE_EXTEND; 624 } 625 goto done; 626 } 627 628 /* 629 * Currently we don't set the mtime on files modified via mmap() 630 * because we can't tell the difference between those modifications 631 * and an attempt by the pageout daemon to flush tmpfs pages to 632 * swap. 633 * 634 * This is because in order to defer flushes as long as possible 635 * buwrite() works by marking the underlying VM pages dirty in 636 * order to be able to dispose of the buffer cache buffer without 637 * flushing it. 638 */ 639 TMPFS_NODE_LOCK(node); 640 if (uio->uio_segflg != UIO_NOCOPY) 641 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED; 642 if (extended) 643 node->tn_status |= TMPFS_NODE_CHANGED; 644 645 if (node->tn_mode & (S_ISUID | S_ISGID)) { 646 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 647 node->tn_mode &= ~(S_ISUID | S_ISGID); 648 } 649 TMPFS_NODE_UNLOCK(node); 650 done: 651 652 tmpfs_knote(vp, kflags); 653 654 655 lwkt_reltoken(&vp->v_mount->mnt_token); 656 return(error); 657 } 658 659 static int 660 tmpfs_advlock (struct vop_advlock_args *ap) 661 { 662 struct tmpfs_node *node; 663 struct vnode *vp = ap->a_vp; 664 665 node = VP_TO_TMPFS_NODE(vp); 666 667 return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 668 } 669 670 /* 671 * The strategy function is typically only called when memory pressure 672 * forces the system to attempt to pageout pages. It can also be called 673 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write 674 * operations 675 */ 676 static int 677 tmpfs_strategy(struct vop_strategy_args *ap) 678 { 679 struct bio *bio = ap->a_bio; 680 struct bio *nbio; 681 struct buf *bp = bio->bio_buf; 682 struct vnode *vp = ap->a_vp; 683 struct tmpfs_node *node; 684 vm_object_t uobj; 685 vm_page_t m; 686 int i; 687 688 if (vp->v_type != VREG) { 689 bp->b_resid = bp->b_bcount; 690 bp->b_flags |= B_ERROR | B_INVAL; 691 bp->b_error = EINVAL; 692 biodone(bio); 693 return(0); 694 } 695 696 lwkt_gettoken(&vp->v_mount->mnt_token); 697 node = VP_TO_TMPFS_NODE(vp); 698 699 uobj = node->tn_reg.tn_aobj; 700 701 /* 702 * Don't bother flushing to swap if there is no swap, just 703 * ensure that the pages are marked as needing a commit (still). 704 */ 705 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { 706 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 707 m = bp->b_xio.xio_pages[i]; 708 vm_page_need_commit(m); 709 } 710 bp->b_resid = 0; 711 bp->b_error = 0; 712 biodone(bio); 713 } else { 714 nbio = push_bio(bio); 715 nbio->bio_done = tmpfs_strategy_done; 716 nbio->bio_offset = bio->bio_offset; 717 swap_pager_strategy(uobj, nbio); 718 } 719 720 lwkt_reltoken(&vp->v_mount->mnt_token); 721 return 0; 722 } 723 724 /* 725 * If we were unable to commit the pages to swap make sure they are marked 726 * as needing a commit (again). If we were, clear the flag to allow the 727 * pages to be freed. 728 */ 729 static void 730 tmpfs_strategy_done(struct bio *bio) 731 { 732 struct buf *bp; 733 vm_page_t m; 734 int i; 735 736 bp = bio->bio_buf; 737 738 if (bp->b_flags & B_ERROR) { 739 bp->b_flags &= ~B_ERROR; 740 bp->b_error = 0; 741 bp->b_resid = 0; 742 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 743 m = bp->b_xio.xio_pages[i]; 744 vm_page_need_commit(m); 745 } 746 } else { 747 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 748 m = bp->b_xio.xio_pages[i]; 749 vm_page_clear_commit(m); 750 } 751 } 752 bio = pop_bio(bio); 753 biodone(bio); 754 } 755 756 static int 757 tmpfs_bmap(struct vop_bmap_args *ap) 758 { 759 if (ap->a_doffsetp != NULL) 760 *ap->a_doffsetp = ap->a_loffset; 761 if (ap->a_runp != NULL) 762 *ap->a_runp = 0; 763 if (ap->a_runb != NULL) 764 *ap->a_runb = 0; 765 766 return 0; 767 } 768 769 /* --------------------------------------------------------------------- */ 770 771 static int 772 tmpfs_nremove(struct vop_nremove_args *v) 773 { 774 struct vnode *dvp = v->a_dvp; 775 struct namecache *ncp = v->a_nch->ncp; 776 struct vnode *vp; 777 int error; 778 struct tmpfs_dirent *de; 779 struct tmpfs_mount *tmp; 780 struct tmpfs_node *dnode; 781 struct tmpfs_node *node; 782 783 /* 784 * We have to acquire the vp from v->a_nch because we will likely 785 * unresolve the namecache entry, and a vrele/vput is needed to 786 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 787 * 788 * We have to use vget to clear any inactive state on the vnode, 789 * otherwise the vnode may remain inactive and thus tmpfs_inactive 790 * will not get called when we release it. 791 */ 792 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 793 KKASSERT(error == 0); 794 vn_unlock(vp); 795 796 if (vp->v_type == VDIR) { 797 error = EISDIR; 798 goto out; 799 } 800 801 dnode = VP_TO_TMPFS_DIR(dvp); 802 node = VP_TO_TMPFS_NODE(vp); 803 tmp = VFS_TO_TMPFS(vp->v_mount); 804 de = tmpfs_dir_lookup(dnode, node, ncp); 805 if (de == NULL) { 806 error = ENOENT; 807 goto out; 808 } 809 810 /* Files marked as immutable or append-only cannot be deleted. */ 811 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 812 (dnode->tn_flags & APPEND)) { 813 error = EPERM; 814 goto out; 815 } 816 817 /* Remove the entry from the directory; as it is a file, we do not 818 * have to change the number of hard links of the directory. */ 819 tmpfs_dir_detach(dnode, de); 820 821 /* Free the directory entry we just deleted. Note that the node 822 * referred by it will not be removed until the vnode is really 823 * reclaimed. */ 824 tmpfs_free_dirent(tmp, de); 825 826 if (node->tn_links > 0) { 827 TMPFS_NODE_LOCK(node); 828 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 829 TMPFS_NODE_MODIFIED; 830 TMPFS_NODE_UNLOCK(node); 831 } 832 833 cache_setunresolved(v->a_nch); 834 cache_setvp(v->a_nch, NULL); 835 tmpfs_knote(vp, NOTE_DELETE); 836 /*cache_inval_vp(vp, CINV_DESTROY);*/ 837 tmpfs_knote(dvp, NOTE_WRITE); 838 error = 0; 839 840 out: 841 vrele(vp); 842 843 return error; 844 } 845 846 /* --------------------------------------------------------------------- */ 847 848 static int 849 tmpfs_nlink(struct vop_nlink_args *v) 850 { 851 struct vnode *dvp = v->a_dvp; 852 struct vnode *vp = v->a_vp; 853 struct namecache *ncp = v->a_nch->ncp; 854 struct tmpfs_dirent *de; 855 struct tmpfs_node *node; 856 struct tmpfs_node *dnode; 857 int error; 858 859 KKASSERT(dvp != vp); /* XXX When can this be false? */ 860 861 node = VP_TO_TMPFS_NODE(vp); 862 dnode = VP_TO_TMPFS_NODE(dvp); 863 864 /* XXX: Why aren't the following two tests done by the caller? */ 865 866 /* Hard links of directories are forbidden. */ 867 if (vp->v_type == VDIR) { 868 error = EPERM; 869 goto out; 870 } 871 872 /* Cannot create cross-device links. */ 873 if (dvp->v_mount != vp->v_mount) { 874 error = EXDEV; 875 goto out; 876 } 877 878 /* Ensure that we do not overflow the maximum number of links imposed 879 * by the system. */ 880 KKASSERT(node->tn_links <= LINK_MAX); 881 if (node->tn_links == LINK_MAX) { 882 error = EMLINK; 883 goto out; 884 } 885 886 /* We cannot create links of files marked immutable or append-only. */ 887 if (node->tn_flags & (IMMUTABLE | APPEND)) { 888 error = EPERM; 889 goto out; 890 } 891 892 /* Allocate a new directory entry to represent the node. */ 893 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 894 ncp->nc_name, ncp->nc_nlen, &de); 895 if (error != 0) 896 goto out; 897 898 /* Insert the new directory entry into the appropriate directory. */ 899 tmpfs_dir_attach(dnode, de); 900 901 /* vp link count has changed, so update node times. */ 902 903 TMPFS_NODE_LOCK(node); 904 node->tn_status |= TMPFS_NODE_CHANGED; 905 TMPFS_NODE_UNLOCK(node); 906 tmpfs_update(vp); 907 908 tmpfs_knote(vp, NOTE_LINK); 909 cache_setunresolved(v->a_nch); 910 cache_setvp(v->a_nch, vp); 911 tmpfs_knote(dvp, NOTE_WRITE); 912 error = 0; 913 914 out: 915 return error; 916 } 917 918 /* --------------------------------------------------------------------- */ 919 920 static int 921 tmpfs_nrename(struct vop_nrename_args *v) 922 { 923 struct vnode *fdvp = v->a_fdvp; 924 struct namecache *fncp = v->a_fnch->ncp; 925 struct vnode *fvp = fncp->nc_vp; 926 struct vnode *tdvp = v->a_tdvp; 927 struct namecache *tncp = v->a_tnch->ncp; 928 struct vnode *tvp; 929 struct tmpfs_dirent *de; 930 struct tmpfs_mount *tmp; 931 struct tmpfs_node *fdnode; 932 struct tmpfs_node *fnode; 933 struct tmpfs_node *tnode; 934 struct tmpfs_node *tdnode; 935 char *newname; 936 char *oldname; 937 int error; 938 939 /* 940 * Because tvp can get overwritten we have to vget it instead of 941 * just vref or use it, otherwise it's VINACTIVE flag may not get 942 * cleared and the node won't get destroyed. 943 */ 944 error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp); 945 if (error == 0) { 946 tnode = VP_TO_TMPFS_NODE(tvp); 947 vn_unlock(tvp); 948 } else { 949 tnode = NULL; 950 } 951 952 /* Disallow cross-device renames. 953 * XXX Why isn't this done by the caller? */ 954 if (fvp->v_mount != tdvp->v_mount || 955 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 956 error = EXDEV; 957 goto out; 958 } 959 960 tmp = VFS_TO_TMPFS(tdvp->v_mount); 961 tdnode = VP_TO_TMPFS_DIR(tdvp); 962 963 /* If source and target are the same file, there is nothing to do. */ 964 if (fvp == tvp) { 965 error = 0; 966 goto out; 967 } 968 969 fdnode = VP_TO_TMPFS_DIR(fdvp); 970 fnode = VP_TO_TMPFS_NODE(fvp); 971 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 972 973 /* Avoid manipulating '.' and '..' entries. */ 974 if (de == NULL) { 975 error = ENOENT; 976 goto out_locked; 977 } 978 KKASSERT(de->td_node == fnode); 979 980 /* 981 * If replacing an entry in the target directory and that entry 982 * is a directory, it must be empty. 983 * 984 * Kern_rename gurantees the destination to be a directory 985 * if the source is one (it does?). 986 */ 987 if (tvp != NULL) { 988 KKASSERT(tnode != NULL); 989 990 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 991 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 992 error = EPERM; 993 goto out_locked; 994 } 995 996 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 997 if (tnode->tn_size > 0) { 998 error = ENOTEMPTY; 999 goto out_locked; 1000 } 1001 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1002 error = ENOTDIR; 1003 goto out_locked; 1004 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1005 error = EISDIR; 1006 goto out_locked; 1007 } else { 1008 KKASSERT(fnode->tn_type != VDIR && 1009 tnode->tn_type != VDIR); 1010 } 1011 } 1012 1013 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1014 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1015 error = EPERM; 1016 goto out_locked; 1017 } 1018 1019 /* 1020 * Ensure that we have enough memory to hold the new name, if it 1021 * has to be changed. 1022 */ 1023 if (fncp->nc_nlen != tncp->nc_nlen || 1024 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 1025 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 1026 M_WAITOK | M_NULLOK); 1027 if (newname == NULL) { 1028 error = ENOSPC; 1029 goto out_locked; 1030 } 1031 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 1032 newname[tncp->nc_nlen] = '\0'; 1033 } else { 1034 newname = NULL; 1035 } 1036 1037 /* 1038 * Unlink entry from source directory. Note that the kernel has 1039 * already checked for illegal recursion cases (renaming a directory 1040 * into a subdirectory of itself). 1041 */ 1042 if (fdnode != tdnode) 1043 tmpfs_dir_detach(fdnode, de); 1044 1045 /* 1046 * Handle any name change. Swap with newname, we will 1047 * deallocate it at the end. 1048 */ 1049 if (newname != NULL) { 1050 #if 0 1051 TMPFS_NODE_LOCK(fnode); 1052 fnode->tn_status |= TMPFS_NODE_CHANGED; 1053 TMPFS_NODE_UNLOCK(fnode); 1054 #endif 1055 oldname = de->td_name; 1056 de->td_name = newname; 1057 de->td_namelen = (uint16_t)tncp->nc_nlen; 1058 newname = oldname; 1059 } 1060 1061 /* 1062 * Link entry to target directory. If the entry 1063 * represents a directory move the parent linkage 1064 * as well. 1065 */ 1066 if (fdnode != tdnode) { 1067 if (de->td_node->tn_type == VDIR) { 1068 TMPFS_VALIDATE_DIR(fnode); 1069 1070 TMPFS_NODE_LOCK(tdnode); 1071 tdnode->tn_links++; 1072 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1073 TMPFS_NODE_UNLOCK(tdnode); 1074 1075 TMPFS_NODE_LOCK(fnode); 1076 fnode->tn_dir.tn_parent = tdnode; 1077 fnode->tn_status |= TMPFS_NODE_CHANGED; 1078 TMPFS_NODE_UNLOCK(fnode); 1079 1080 TMPFS_NODE_LOCK(fdnode); 1081 fdnode->tn_links--; 1082 fdnode->tn_status |= TMPFS_NODE_MODIFIED; 1083 TMPFS_NODE_UNLOCK(fdnode); 1084 } 1085 tmpfs_dir_attach(tdnode, de); 1086 } else { 1087 TMPFS_NODE_LOCK(tdnode); 1088 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1089 TMPFS_NODE_UNLOCK(tdnode); 1090 } 1091 1092 /* 1093 * If we are overwriting an entry, we have to remove the old one 1094 * from the target directory. 1095 */ 1096 if (tvp != NULL) { 1097 /* Remove the old entry from the target directory. */ 1098 de = tmpfs_dir_lookup(tdnode, tnode, tncp); 1099 tmpfs_dir_detach(tdnode, de); 1100 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1101 1102 /* 1103 * Free the directory entry we just deleted. Note that the 1104 * node referred by it will not be removed until the vnode is 1105 * really reclaimed. 1106 */ 1107 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de); 1108 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1109 } 1110 1111 /* 1112 * Finish up 1113 */ 1114 if (newname) { 1115 kfree(newname, tmp->tm_name_zone); 1116 newname = NULL; 1117 } 1118 cache_rename(v->a_fnch, v->a_tnch); 1119 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1120 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1121 if (fnode->tn_vnode) 1122 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1123 error = 0; 1124 1125 out_locked: 1126 ; 1127 1128 out: 1129 if (tvp) 1130 vrele(tvp); 1131 1132 return error; 1133 } 1134 1135 /* --------------------------------------------------------------------- */ 1136 1137 static int 1138 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1139 { 1140 struct vnode *dvp = v->a_dvp; 1141 struct vnode **vpp = v->a_vpp; 1142 struct namecache *ncp = v->a_nch->ncp; 1143 struct vattr *vap = v->a_vap; 1144 struct ucred *cred = v->a_cred; 1145 int error; 1146 1147 KKASSERT(vap->va_type == VDIR); 1148 1149 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1150 if (error == 0) { 1151 cache_setunresolved(v->a_nch); 1152 cache_setvp(v->a_nch, *vpp); 1153 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1154 } 1155 1156 return error; 1157 } 1158 1159 /* --------------------------------------------------------------------- */ 1160 1161 static int 1162 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1163 { 1164 struct vnode *dvp = v->a_dvp; 1165 struct namecache *ncp = v->a_nch->ncp; 1166 struct vnode *vp; 1167 struct tmpfs_dirent *de; 1168 struct tmpfs_mount *tmp; 1169 struct tmpfs_node *dnode; 1170 struct tmpfs_node *node; 1171 int error; 1172 1173 /* 1174 * We have to acquire the vp from v->a_nch because we will likely 1175 * unresolve the namecache entry, and a vrele/vput is needed to 1176 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 1177 * 1178 * We have to use vget to clear any inactive state on the vnode, 1179 * otherwise the vnode may remain inactive and thus tmpfs_inactive 1180 * will not get called when we release it. 1181 */ 1182 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 1183 KKASSERT(error == 0); 1184 vn_unlock(vp); 1185 1186 /* 1187 * Prevalidate so we don't hit an assertion later 1188 */ 1189 if (vp->v_type != VDIR) { 1190 error = ENOTDIR; 1191 goto out; 1192 } 1193 1194 tmp = VFS_TO_TMPFS(dvp->v_mount); 1195 dnode = VP_TO_TMPFS_DIR(dvp); 1196 node = VP_TO_TMPFS_DIR(vp); 1197 1198 /* Directories with more than two entries ('.' and '..') cannot be 1199 * removed. */ 1200 if (node->tn_size > 0) { 1201 error = ENOTEMPTY; 1202 goto out; 1203 } 1204 1205 if ((dnode->tn_flags & APPEND) 1206 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1207 error = EPERM; 1208 goto out; 1209 } 1210 1211 /* This invariant holds only if we are not trying to remove "..". 1212 * We checked for that above so this is safe now. */ 1213 KKASSERT(node->tn_dir.tn_parent == dnode); 1214 1215 /* Get the directory entry associated with node (vp). This was 1216 * filled by tmpfs_lookup while looking up the entry. */ 1217 de = tmpfs_dir_lookup(dnode, node, ncp); 1218 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1219 ncp->nc_name, 1220 ncp->nc_nlen)); 1221 1222 /* Check flags to see if we are allowed to remove the directory. */ 1223 if ((dnode->tn_flags & APPEND) || 1224 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1225 error = EPERM; 1226 goto out; 1227 } 1228 1229 1230 /* Detach the directory entry from the directory (dnode). */ 1231 tmpfs_dir_detach(dnode, de); 1232 1233 /* No vnode should be allocated for this entry from this point */ 1234 TMPFS_NODE_LOCK(node); 1235 TMPFS_ASSERT_ELOCKED(node); 1236 TMPFS_NODE_LOCK(dnode); 1237 TMPFS_ASSERT_ELOCKED(dnode); 1238 1239 #if 0 1240 /* handled by tmpfs_free_node */ 1241 KKASSERT(node->tn_links > 0); 1242 node->tn_links--; 1243 node->tn_dir.tn_parent = NULL; 1244 #endif 1245 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1246 TMPFS_NODE_MODIFIED; 1247 1248 #if 0 1249 /* handled by tmpfs_free_node */ 1250 KKASSERT(dnode->tn_links > 0); 1251 dnode->tn_links--; 1252 #endif 1253 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1254 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1255 1256 TMPFS_NODE_UNLOCK(dnode); 1257 TMPFS_NODE_UNLOCK(node); 1258 1259 /* Free the directory entry we just deleted. Note that the node 1260 * referred by it will not be removed until the vnode is really 1261 * reclaimed. */ 1262 tmpfs_free_dirent(tmp, de); 1263 1264 /* Release the deleted vnode (will destroy the node, notify 1265 * interested parties and clean it from the cache). */ 1266 1267 TMPFS_NODE_LOCK(dnode); 1268 dnode->tn_status |= TMPFS_NODE_CHANGED; 1269 TMPFS_NODE_UNLOCK(dnode); 1270 tmpfs_update(dvp); 1271 1272 cache_setunresolved(v->a_nch); 1273 cache_setvp(v->a_nch, NULL); 1274 /*cache_inval_vp(vp, CINV_DESTROY);*/ 1275 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1276 error = 0; 1277 1278 out: 1279 vrele(vp); 1280 1281 return error; 1282 } 1283 1284 /* --------------------------------------------------------------------- */ 1285 1286 static int 1287 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1288 { 1289 struct vnode *dvp = v->a_dvp; 1290 struct vnode **vpp = v->a_vpp; 1291 struct namecache *ncp = v->a_nch->ncp; 1292 struct vattr *vap = v->a_vap; 1293 struct ucred *cred = v->a_cred; 1294 char *target = v->a_target; 1295 int error; 1296 1297 vap->va_type = VLNK; 1298 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1299 if (error == 0) { 1300 tmpfs_knote(*vpp, NOTE_WRITE); 1301 cache_setunresolved(v->a_nch); 1302 cache_setvp(v->a_nch, *vpp); 1303 } 1304 1305 return error; 1306 } 1307 1308 /* --------------------------------------------------------------------- */ 1309 1310 static int 1311 tmpfs_readdir(struct vop_readdir_args *v) 1312 { 1313 struct vnode *vp = v->a_vp; 1314 struct uio *uio = v->a_uio; 1315 int *eofflag = v->a_eofflag; 1316 off_t **cookies = v->a_cookies; 1317 int *ncookies = v->a_ncookies; 1318 struct tmpfs_mount *tmp; 1319 int error; 1320 off_t startoff; 1321 off_t cnt = 0; 1322 struct tmpfs_node *node; 1323 1324 /* This operation only makes sense on directory nodes. */ 1325 if (vp->v_type != VDIR) 1326 return ENOTDIR; 1327 1328 tmp = VFS_TO_TMPFS(vp->v_mount); 1329 node = VP_TO_TMPFS_DIR(vp); 1330 startoff = uio->uio_offset; 1331 1332 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1333 error = tmpfs_dir_getdotdent(node, uio); 1334 if (error != 0) 1335 goto outok; 1336 cnt++; 1337 } 1338 1339 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1340 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1341 if (error != 0) 1342 goto outok; 1343 cnt++; 1344 } 1345 1346 error = tmpfs_dir_getdents(node, uio, &cnt); 1347 1348 outok: 1349 KKASSERT(error >= -1); 1350 1351 if (error == -1) 1352 error = 0; 1353 1354 if (eofflag != NULL) 1355 *eofflag = 1356 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1357 1358 /* Update NFS-related variables. */ 1359 if (error == 0 && cookies != NULL && ncookies != NULL) { 1360 off_t i; 1361 off_t off = startoff; 1362 struct tmpfs_dirent *de = NULL; 1363 1364 *ncookies = cnt; 1365 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1366 1367 for (i = 0; i < cnt; i++) { 1368 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1369 if (off == TMPFS_DIRCOOKIE_DOT) { 1370 off = TMPFS_DIRCOOKIE_DOTDOT; 1371 } else { 1372 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1373 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1374 } else if (de != NULL) { 1375 de = TAILQ_NEXT(de, td_entries); 1376 } else { 1377 de = tmpfs_dir_lookupbycookie(node, 1378 off); 1379 KKASSERT(de != NULL); 1380 de = TAILQ_NEXT(de, td_entries); 1381 } 1382 if (de == NULL) 1383 off = TMPFS_DIRCOOKIE_EOF; 1384 else 1385 off = tmpfs_dircookie(de); 1386 } 1387 1388 (*cookies)[i] = off; 1389 } 1390 KKASSERT(uio->uio_offset == off); 1391 } 1392 1393 return error; 1394 } 1395 1396 /* --------------------------------------------------------------------- */ 1397 1398 static int 1399 tmpfs_readlink(struct vop_readlink_args *v) 1400 { 1401 struct vnode *vp = v->a_vp; 1402 struct uio *uio = v->a_uio; 1403 1404 int error; 1405 struct tmpfs_node *node; 1406 1407 KKASSERT(uio->uio_offset == 0); 1408 KKASSERT(vp->v_type == VLNK); 1409 1410 node = VP_TO_TMPFS_NODE(vp); 1411 1412 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1413 uio); 1414 TMPFS_NODE_LOCK(node); 1415 node->tn_status |= TMPFS_NODE_ACCESSED; 1416 TMPFS_NODE_UNLOCK(node); 1417 1418 return error; 1419 } 1420 1421 /* --------------------------------------------------------------------- */ 1422 1423 static int 1424 tmpfs_inactive(struct vop_inactive_args *v) 1425 { 1426 struct vnode *vp = v->a_vp; 1427 struct tmpfs_node *node; 1428 1429 node = VP_TO_TMPFS_NODE(vp); 1430 1431 /* 1432 * Degenerate case 1433 */ 1434 if (node == NULL) { 1435 vrecycle(vp); 1436 return(0); 1437 } 1438 1439 /* 1440 * Get rid of unreferenced deleted vnodes sooner rather than 1441 * later so the data memory can be recovered immediately. 1442 * 1443 * We must truncate the vnode to prevent the normal reclamation 1444 * path from flushing the data for the removed file to disk. 1445 */ 1446 TMPFS_NODE_LOCK(node); 1447 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1448 (node->tn_links == 0 || 1449 (node->tn_links == 1 && node->tn_type == VDIR && 1450 node->tn_dir.tn_parent))) 1451 { 1452 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1453 TMPFS_NODE_UNLOCK(node); 1454 if (node->tn_type == VREG) 1455 tmpfs_truncate(vp, 0); 1456 vrecycle(vp); 1457 } else { 1458 TMPFS_NODE_UNLOCK(node); 1459 } 1460 1461 return 0; 1462 } 1463 1464 /* --------------------------------------------------------------------- */ 1465 1466 int 1467 tmpfs_reclaim(struct vop_reclaim_args *v) 1468 { 1469 struct vnode *vp = v->a_vp; 1470 struct tmpfs_mount *tmp; 1471 struct tmpfs_node *node; 1472 1473 node = VP_TO_TMPFS_NODE(vp); 1474 tmp = VFS_TO_TMPFS(vp->v_mount); 1475 1476 tmpfs_free_vp(vp); 1477 1478 /* 1479 * If the node referenced by this vnode was deleted by the 1480 * user, we must free its associated data structures now that 1481 * the vnode is being reclaimed. 1482 * 1483 * Directories have an extra link ref. 1484 */ 1485 TMPFS_NODE_LOCK(node); 1486 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1487 (node->tn_links == 0 || 1488 (node->tn_links == 1 && node->tn_type == VDIR && 1489 node->tn_dir.tn_parent))) 1490 { 1491 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1492 tmpfs_free_node(tmp, node); 1493 /* eats the lock */ 1494 } else { 1495 TMPFS_NODE_UNLOCK(node); 1496 } 1497 1498 KKASSERT(vp->v_data == NULL); 1499 return 0; 1500 } 1501 1502 /* --------------------------------------------------------------------- */ 1503 1504 static int 1505 tmpfs_mountctl(struct vop_mountctl_args *ap) 1506 { 1507 struct tmpfs_mount *tmp; 1508 struct mount *mp; 1509 int rc; 1510 1511 switch (ap->a_op) { 1512 case (MOUNTCTL_SET_EXPORT): 1513 mp = ap->a_head.a_ops->head.vv_mount; 1514 tmp = (struct tmpfs_mount *) mp->mnt_data; 1515 1516 if (ap->a_ctllen != sizeof(struct export_args)) 1517 rc = (EINVAL); 1518 else 1519 rc = vfs_export(mp, &tmp->tm_export, 1520 (const struct export_args *) ap->a_ctl); 1521 break; 1522 default: 1523 rc = vop_stdmountctl(ap); 1524 break; 1525 } 1526 return (rc); 1527 } 1528 1529 /* --------------------------------------------------------------------- */ 1530 1531 static int 1532 tmpfs_print(struct vop_print_args *v) 1533 { 1534 struct vnode *vp = v->a_vp; 1535 1536 struct tmpfs_node *node; 1537 1538 node = VP_TO_TMPFS_NODE(vp); 1539 1540 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1541 node, node->tn_flags, node->tn_links); 1542 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1543 node->tn_mode, node->tn_uid, node->tn_gid, 1544 (uintmax_t)node->tn_size, node->tn_status); 1545 1546 if (vp->v_type == VFIFO) 1547 fifo_printinfo(vp); 1548 1549 kprintf("\n"); 1550 1551 return 0; 1552 } 1553 1554 /* --------------------------------------------------------------------- */ 1555 1556 static int 1557 tmpfs_pathconf(struct vop_pathconf_args *v) 1558 { 1559 int name = v->a_name; 1560 register_t *retval = v->a_retval; 1561 1562 int error; 1563 1564 error = 0; 1565 1566 switch (name) { 1567 case _PC_LINK_MAX: 1568 *retval = LINK_MAX; 1569 break; 1570 1571 case _PC_NAME_MAX: 1572 *retval = NAME_MAX; 1573 break; 1574 1575 case _PC_PATH_MAX: 1576 *retval = PATH_MAX; 1577 break; 1578 1579 case _PC_PIPE_BUF: 1580 *retval = PIPE_BUF; 1581 break; 1582 1583 case _PC_CHOWN_RESTRICTED: 1584 *retval = 1; 1585 break; 1586 1587 case _PC_NO_TRUNC: 1588 *retval = 1; 1589 break; 1590 1591 case _PC_SYNC_IO: 1592 *retval = 1; 1593 break; 1594 1595 case _PC_FILESIZEBITS: 1596 *retval = 0; /* XXX Don't know which value should I return. */ 1597 break; 1598 1599 default: 1600 error = EINVAL; 1601 } 1602 1603 return error; 1604 } 1605 1606 /************************************************************************ 1607 * KQFILTER OPS * 1608 ************************************************************************/ 1609 1610 static void filt_tmpfsdetach(struct knote *kn); 1611 static int filt_tmpfsread(struct knote *kn, long hint); 1612 static int filt_tmpfswrite(struct knote *kn, long hint); 1613 static int filt_tmpfsvnode(struct knote *kn, long hint); 1614 1615 static struct filterops tmpfsread_filtops = 1616 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1617 static struct filterops tmpfswrite_filtops = 1618 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1619 static struct filterops tmpfsvnode_filtops = 1620 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1621 1622 static int 1623 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1624 { 1625 struct vnode *vp = ap->a_vp; 1626 struct knote *kn = ap->a_kn; 1627 1628 switch (kn->kn_filter) { 1629 case EVFILT_READ: 1630 kn->kn_fop = &tmpfsread_filtops; 1631 break; 1632 case EVFILT_WRITE: 1633 kn->kn_fop = &tmpfswrite_filtops; 1634 break; 1635 case EVFILT_VNODE: 1636 kn->kn_fop = &tmpfsvnode_filtops; 1637 break; 1638 default: 1639 return (EOPNOTSUPP); 1640 } 1641 1642 kn->kn_hook = (caddr_t)vp; 1643 1644 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1645 1646 return(0); 1647 } 1648 1649 static void 1650 filt_tmpfsdetach(struct knote *kn) 1651 { 1652 struct vnode *vp = (void *)kn->kn_hook; 1653 1654 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1655 } 1656 1657 static int 1658 filt_tmpfsread(struct knote *kn, long hint) 1659 { 1660 struct vnode *vp = (void *)kn->kn_hook; 1661 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1662 off_t off; 1663 1664 if (hint == NOTE_REVOKE) { 1665 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1666 return(1); 1667 } 1668 1669 /* 1670 * Interlock against MP races when performing this function. 1671 */ 1672 lwkt_gettoken(&vp->v_mount->mnt_token); 1673 off = node->tn_size - kn->kn_fp->f_offset; 1674 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1675 if (kn->kn_sfflags & NOTE_OLDAPI) { 1676 lwkt_reltoken(&vp->v_mount->mnt_token); 1677 return(1); 1678 } 1679 1680 if (kn->kn_data == 0) { 1681 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1682 } 1683 lwkt_reltoken(&vp->v_mount->mnt_token); 1684 return (kn->kn_data != 0); 1685 } 1686 1687 static int 1688 filt_tmpfswrite(struct knote *kn, long hint) 1689 { 1690 if (hint == NOTE_REVOKE) 1691 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1692 kn->kn_data = 0; 1693 return (1); 1694 } 1695 1696 static int 1697 filt_tmpfsvnode(struct knote *kn, long hint) 1698 { 1699 if (kn->kn_sfflags & hint) 1700 kn->kn_fflags |= hint; 1701 if (hint == NOTE_REVOKE) { 1702 kn->kn_flags |= (EV_EOF | EV_NODATA); 1703 return (1); 1704 } 1705 return (kn->kn_fflags != 0); 1706 } 1707 1708 1709 /* --------------------------------------------------------------------- */ 1710 1711 /* 1712 * vnode operations vector used for files stored in a tmpfs file system. 1713 */ 1714 struct vop_ops tmpfs_vnode_vops = { 1715 .vop_default = vop_defaultop, 1716 .vop_getpages = vop_stdgetpages, 1717 .vop_putpages = vop_stdputpages, 1718 .vop_ncreate = tmpfs_ncreate, 1719 .vop_nresolve = tmpfs_nresolve, 1720 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1721 .vop_nmknod = tmpfs_nmknod, 1722 .vop_open = tmpfs_open, 1723 .vop_close = tmpfs_close, 1724 .vop_access = tmpfs_access, 1725 .vop_getattr = tmpfs_getattr, 1726 .vop_setattr = tmpfs_setattr, 1727 .vop_read = tmpfs_read, 1728 .vop_write = tmpfs_write, 1729 .vop_fsync = tmpfs_fsync, 1730 .vop_mountctl = tmpfs_mountctl, 1731 .vop_nremove = tmpfs_nremove, 1732 .vop_nlink = tmpfs_nlink, 1733 .vop_nrename = tmpfs_nrename, 1734 .vop_nmkdir = tmpfs_nmkdir, 1735 .vop_nrmdir = tmpfs_nrmdir, 1736 .vop_nsymlink = tmpfs_nsymlink, 1737 .vop_readdir = tmpfs_readdir, 1738 .vop_readlink = tmpfs_readlink, 1739 .vop_inactive = tmpfs_inactive, 1740 .vop_reclaim = tmpfs_reclaim, 1741 .vop_print = tmpfs_print, 1742 .vop_pathconf = tmpfs_pathconf, 1743 .vop_bmap = tmpfs_bmap, 1744 .vop_strategy = tmpfs_strategy, 1745 .vop_advlock = tmpfs_advlock, 1746 .vop_kqfilter = tmpfs_kqfilter 1747 }; 1748