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 #if 0 215 /* The file is still active but all its names have been removed 216 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 217 * it is about to die. */ 218 if (node->tn_links < 1) 219 return (ENOENT); 220 #endif 221 222 /* If the file is marked append-only, deny write requests. */ 223 if ((node->tn_flags & APPEND) && 224 (mode & (FWRITE | O_APPEND)) == FWRITE) { 225 error = EPERM; 226 } else { 227 return (vop_stdopen(v)); 228 } 229 return error; 230 } 231 232 /* --------------------------------------------------------------------- */ 233 234 static int 235 tmpfs_close(struct vop_close_args *v) 236 { 237 struct vnode *vp = v->a_vp; 238 struct tmpfs_node *node; 239 240 node = VP_TO_TMPFS_NODE(vp); 241 242 if (node->tn_links > 0) { 243 /* 244 * Update node times. No need to do it if the node has 245 * been deleted, because it will vanish after we return. 246 */ 247 tmpfs_update(vp); 248 } 249 250 return vop_stdclose(v); 251 } 252 253 /* --------------------------------------------------------------------- */ 254 255 int 256 tmpfs_access(struct vop_access_args *v) 257 { 258 struct vnode *vp = v->a_vp; 259 int error; 260 struct tmpfs_node *node; 261 262 node = VP_TO_TMPFS_NODE(vp); 263 264 switch (vp->v_type) { 265 case VDIR: 266 /* FALLTHROUGH */ 267 case VLNK: 268 /* FALLTHROUGH */ 269 case VREG: 270 if ((v->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 271 error = EROFS; 272 goto out; 273 } 274 break; 275 276 case VBLK: 277 /* FALLTHROUGH */ 278 case VCHR: 279 /* FALLTHROUGH */ 280 case VSOCK: 281 /* FALLTHROUGH */ 282 case VFIFO: 283 break; 284 285 default: 286 error = EINVAL; 287 goto out; 288 } 289 290 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 291 error = EPERM; 292 goto out; 293 } 294 295 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0); 296 297 out: 298 299 return error; 300 } 301 302 /* --------------------------------------------------------------------- */ 303 304 int 305 tmpfs_getattr(struct vop_getattr_args *v) 306 { 307 struct vnode *vp = v->a_vp; 308 struct vattr *vap = v->a_vap; 309 struct tmpfs_node *node; 310 311 node = VP_TO_TMPFS_NODE(vp); 312 313 lwkt_gettoken(&vp->v_mount->mnt_token); 314 tmpfs_update(vp); 315 316 vap->va_type = vp->v_type; 317 vap->va_mode = node->tn_mode; 318 vap->va_nlink = node->tn_links; 319 vap->va_uid = node->tn_uid; 320 vap->va_gid = node->tn_gid; 321 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 322 vap->va_fileid = node->tn_id; 323 vap->va_size = node->tn_size; 324 vap->va_blocksize = PAGE_SIZE; 325 vap->va_atime.tv_sec = node->tn_atime; 326 vap->va_atime.tv_nsec = node->tn_atimensec; 327 vap->va_mtime.tv_sec = node->tn_mtime; 328 vap->va_mtime.tv_nsec = node->tn_mtimensec; 329 vap->va_ctime.tv_sec = node->tn_ctime; 330 vap->va_ctime.tv_nsec = node->tn_ctimensec; 331 vap->va_gen = node->tn_gen; 332 vap->va_flags = node->tn_flags; 333 if (vp->v_type == VBLK || vp->v_type == VCHR) 334 { 335 vap->va_rmajor = umajor(node->tn_rdev); 336 vap->va_rminor = uminor(node->tn_rdev); 337 } 338 vap->va_bytes = round_page(node->tn_size); 339 vap->va_filerev = 0; 340 341 lwkt_reltoken(&vp->v_mount->mnt_token); 342 343 return 0; 344 } 345 346 /* --------------------------------------------------------------------- */ 347 348 int 349 tmpfs_setattr(struct vop_setattr_args *v) 350 { 351 struct vnode *vp = v->a_vp; 352 struct vattr *vap = v->a_vap; 353 struct ucred *cred = v->a_cred; 354 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 355 int error = 0; 356 int kflags = 0; 357 358 if (error == 0 && (vap->va_flags != VNOVAL)) { 359 error = tmpfs_chflags(vp, vap->va_flags, cred); 360 kflags |= NOTE_ATTRIB; 361 } 362 363 if (error == 0 && (vap->va_size != VNOVAL)) { 364 if (vap->va_size > node->tn_size) 365 kflags |= NOTE_WRITE | NOTE_EXTEND; 366 else 367 kflags |= NOTE_WRITE; 368 error = tmpfs_chsize(vp, vap->va_size, cred); 369 } 370 371 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 372 vap->va_gid != (gid_t)VNOVAL)) { 373 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 374 kflags |= NOTE_ATTRIB; 375 } 376 377 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 378 error = tmpfs_chmod(vp, vap->va_mode, cred); 379 kflags |= NOTE_ATTRIB; 380 } 381 382 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 383 vap->va_atime.tv_nsec != VNOVAL) || 384 (vap->va_mtime.tv_sec != VNOVAL && 385 vap->va_mtime.tv_nsec != VNOVAL) )) { 386 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 387 vap->va_vaflags, cred); 388 kflags |= NOTE_ATTRIB; 389 } 390 391 /* Update the node times. We give preference to the error codes 392 * generated by this function rather than the ones that may arise 393 * from tmpfs_update. */ 394 tmpfs_update(vp); 395 tmpfs_knote(vp, kflags); 396 397 return error; 398 } 399 400 /* --------------------------------------------------------------------- */ 401 402 /* 403 * fsync is usually a NOP, but we must take action when unmounting or 404 * when recycling. 405 */ 406 static int 407 tmpfs_fsync(struct vop_fsync_args *v) 408 { 409 struct tmpfs_node *node; 410 struct vnode *vp = v->a_vp; 411 412 node = VP_TO_TMPFS_NODE(vp); 413 414 tmpfs_update(vp); 415 if (vp->v_type == VREG) { 416 if (vp->v_flag & VRECLAIMED) { 417 if (node->tn_links == 0) 418 tmpfs_truncate(vp, 0); 419 else 420 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); 421 } 422 } 423 return 0; 424 } 425 426 /* --------------------------------------------------------------------- */ 427 428 static int 429 tmpfs_read (struct vop_read_args *ap) 430 { 431 struct buf *bp; 432 struct vnode *vp = ap->a_vp; 433 struct uio *uio = ap->a_uio; 434 struct tmpfs_node *node; 435 off_t base_offset; 436 size_t offset; 437 size_t len; 438 int error; 439 440 error = 0; 441 if (uio->uio_resid == 0) { 442 return error; 443 } 444 445 node = VP_TO_TMPFS_NODE(vp); 446 447 if (uio->uio_offset < 0) 448 return (EINVAL); 449 if (vp->v_type != VREG) 450 return (EINVAL); 451 452 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 453 /* 454 * Use buffer cache I/O (via tmpfs_strategy) 455 */ 456 offset = (size_t)uio->uio_offset & BMASK; 457 base_offset = (off_t)uio->uio_offset - offset; 458 bp = getcacheblk(vp, base_offset, BSIZE, 0); 459 if (bp == NULL) { 460 lwkt_gettoken(&vp->v_mount->mnt_token); 461 error = bread(vp, base_offset, BSIZE, &bp); 462 if (error) { 463 brelse(bp); 464 lwkt_reltoken(&vp->v_mount->mnt_token); 465 kprintf("tmpfs_read bread error %d\n", error); 466 break; 467 } 468 lwkt_reltoken(&vp->v_mount->mnt_token); 469 } 470 471 /* 472 * Figure out how many bytes we can actually copy this loop. 473 */ 474 len = BSIZE - offset; 475 if (len > uio->uio_resid) 476 len = uio->uio_resid; 477 if (len > node->tn_size - uio->uio_offset) 478 len = (size_t)(node->tn_size - uio->uio_offset); 479 480 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 481 bqrelse(bp); 482 if (error) { 483 kprintf("tmpfs_read uiomove error %d\n", error); 484 break; 485 } 486 } 487 488 TMPFS_NODE_LOCK(node); 489 node->tn_status |= TMPFS_NODE_ACCESSED; 490 TMPFS_NODE_UNLOCK(node); 491 492 return(error); 493 } 494 495 static int 496 tmpfs_write (struct vop_write_args *ap) 497 { 498 struct buf *bp; 499 struct vnode *vp = ap->a_vp; 500 struct uio *uio = ap->a_uio; 501 struct thread *td = uio->uio_td; 502 struct tmpfs_node *node; 503 boolean_t extended; 504 off_t oldsize; 505 int error; 506 off_t base_offset; 507 size_t offset; 508 size_t len; 509 struct rlimit limit; 510 int trivial = 0; 511 int kflags = 0; 512 513 error = 0; 514 if (uio->uio_resid == 0) { 515 return error; 516 } 517 518 node = VP_TO_TMPFS_NODE(vp); 519 520 if (vp->v_type != VREG) 521 return (EINVAL); 522 523 lwkt_gettoken(&vp->v_mount->mnt_token); 524 525 oldsize = node->tn_size; 526 if (ap->a_ioflag & IO_APPEND) 527 uio->uio_offset = node->tn_size; 528 529 /* 530 * Check for illegal write offsets. 531 */ 532 if (uio->uio_offset + uio->uio_resid > 533 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 534 lwkt_reltoken(&vp->v_mount->mnt_token); 535 return (EFBIG); 536 } 537 538 if (vp->v_type == VREG && td != NULL) { 539 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 540 if (error != 0) { 541 lwkt_reltoken(&vp->v_mount->mnt_token); 542 return error; 543 } 544 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 545 ksignal(td->td_proc, SIGXFSZ); 546 lwkt_reltoken(&vp->v_mount->mnt_token); 547 return (EFBIG); 548 } 549 } 550 551 552 /* 553 * Extend the file's size if necessary 554 */ 555 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 556 557 while (uio->uio_resid > 0) { 558 /* 559 * Use buffer cache I/O (via tmpfs_strategy) 560 */ 561 offset = (size_t)uio->uio_offset & BMASK; 562 base_offset = (off_t)uio->uio_offset - offset; 563 len = BSIZE - offset; 564 if (len > uio->uio_resid) 565 len = uio->uio_resid; 566 567 if ((uio->uio_offset + len) > node->tn_size) { 568 trivial = (uio->uio_offset <= node->tn_size); 569 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); 570 if (error) 571 break; 572 } 573 574 /* 575 * Read to fill in any gaps. Theoretically we could 576 * optimize this if the write covers the entire buffer 577 * and is not a UIO_NOCOPY write, however this can lead 578 * to a security violation exposing random kernel memory 579 * (whatever junk was in the backing VM pages before). 580 * 581 * So just use bread() to do the right thing. 582 */ 583 error = bread(vp, base_offset, BSIZE, &bp); 584 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 585 if (error) { 586 kprintf("tmpfs_write uiomove error %d\n", error); 587 brelse(bp); 588 break; 589 } 590 591 if (uio->uio_offset > node->tn_size) { 592 node->tn_size = uio->uio_offset; 593 kflags |= NOTE_EXTEND; 594 } 595 kflags |= NOTE_WRITE; 596 597 /* 598 * Always try to flush the page if the request is coming 599 * from the pageout daemon (IO_ASYNC), else buwrite() the 600 * buffer. 601 * 602 * buwrite() dirties the underlying VM pages instead of 603 * dirtying the buffer, releasing the buffer as a clean 604 * buffer. This allows tmpfs to use essentially all 605 * available memory to cache file data. If we used bdwrite() 606 * the buffer cache would wind up flushing the data to 607 * swap too quickly. 608 */ 609 bp->b_flags |= B_AGE; 610 if (ap->a_ioflag & IO_ASYNC) { 611 bawrite(bp); 612 } else { 613 buwrite(bp); 614 } 615 616 if (bp->b_error) { 617 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 618 break; 619 } 620 } 621 622 if (error) { 623 if (extended) { 624 (void)tmpfs_reg_resize(vp, oldsize, trivial); 625 kflags &= ~NOTE_EXTEND; 626 } 627 goto done; 628 } 629 630 /* 631 * Currently we don't set the mtime on files modified via mmap() 632 * because we can't tell the difference between those modifications 633 * and an attempt by the pageout daemon to flush tmpfs pages to 634 * swap. 635 * 636 * This is because in order to defer flushes as long as possible 637 * buwrite() works by marking the underlying VM pages dirty in 638 * order to be able to dispose of the buffer cache buffer without 639 * flushing it. 640 */ 641 TMPFS_NODE_LOCK(node); 642 if (uio->uio_segflg != UIO_NOCOPY) 643 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED; 644 if (extended) 645 node->tn_status |= TMPFS_NODE_CHANGED; 646 647 if (node->tn_mode & (S_ISUID | S_ISGID)) { 648 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 649 node->tn_mode &= ~(S_ISUID | S_ISGID); 650 } 651 TMPFS_NODE_UNLOCK(node); 652 done: 653 654 tmpfs_knote(vp, kflags); 655 656 657 lwkt_reltoken(&vp->v_mount->mnt_token); 658 return(error); 659 } 660 661 static int 662 tmpfs_advlock (struct vop_advlock_args *ap) 663 { 664 struct tmpfs_node *node; 665 struct vnode *vp = ap->a_vp; 666 667 node = VP_TO_TMPFS_NODE(vp); 668 669 return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 670 } 671 672 /* 673 * The strategy function is typically only called when memory pressure 674 * forces the system to attempt to pageout pages. It can also be called 675 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write 676 * operations 677 */ 678 static int 679 tmpfs_strategy(struct vop_strategy_args *ap) 680 { 681 struct bio *bio = ap->a_bio; 682 struct bio *nbio; 683 struct buf *bp = bio->bio_buf; 684 struct vnode *vp = ap->a_vp; 685 struct tmpfs_node *node; 686 vm_object_t uobj; 687 vm_page_t m; 688 int i; 689 690 if (vp->v_type != VREG) { 691 bp->b_resid = bp->b_bcount; 692 bp->b_flags |= B_ERROR | B_INVAL; 693 bp->b_error = EINVAL; 694 biodone(bio); 695 return(0); 696 } 697 698 lwkt_gettoken(&vp->v_mount->mnt_token); 699 node = VP_TO_TMPFS_NODE(vp); 700 701 uobj = node->tn_reg.tn_aobj; 702 703 /* 704 * Don't bother flushing to swap if there is no swap, just 705 * ensure that the pages are marked as needing a commit (still). 706 */ 707 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { 708 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 709 m = bp->b_xio.xio_pages[i]; 710 vm_page_need_commit(m); 711 } 712 bp->b_resid = 0; 713 bp->b_error = 0; 714 biodone(bio); 715 } else { 716 nbio = push_bio(bio); 717 nbio->bio_done = tmpfs_strategy_done; 718 nbio->bio_offset = bio->bio_offset; 719 swap_pager_strategy(uobj, nbio); 720 } 721 722 lwkt_reltoken(&vp->v_mount->mnt_token); 723 return 0; 724 } 725 726 /* 727 * If we were unable to commit the pages to swap make sure they are marked 728 * as needing a commit (again). If we were, clear the flag to allow the 729 * pages to be freed. 730 */ 731 static void 732 tmpfs_strategy_done(struct bio *bio) 733 { 734 struct buf *bp; 735 vm_page_t m; 736 int i; 737 738 bp = bio->bio_buf; 739 740 if (bp->b_flags & B_ERROR) { 741 bp->b_flags &= ~B_ERROR; 742 bp->b_error = 0; 743 bp->b_resid = 0; 744 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 745 m = bp->b_xio.xio_pages[i]; 746 vm_page_need_commit(m); 747 } 748 } else { 749 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 750 m = bp->b_xio.xio_pages[i]; 751 vm_page_clear_commit(m); 752 } 753 } 754 bio = pop_bio(bio); 755 biodone(bio); 756 } 757 758 static int 759 tmpfs_bmap(struct vop_bmap_args *ap) 760 { 761 if (ap->a_doffsetp != NULL) 762 *ap->a_doffsetp = ap->a_loffset; 763 if (ap->a_runp != NULL) 764 *ap->a_runp = 0; 765 if (ap->a_runb != NULL) 766 *ap->a_runb = 0; 767 768 return 0; 769 } 770 771 /* --------------------------------------------------------------------- */ 772 773 static int 774 tmpfs_nremove(struct vop_nremove_args *v) 775 { 776 struct vnode *dvp = v->a_dvp; 777 struct namecache *ncp = v->a_nch->ncp; 778 struct vnode *vp; 779 int error; 780 struct tmpfs_dirent *de; 781 struct tmpfs_mount *tmp; 782 struct tmpfs_node *dnode; 783 struct tmpfs_node *node; 784 785 /* 786 * We have to acquire the vp from v->a_nch because we will likely 787 * unresolve the namecache entry, and a vrele/vput is needed to 788 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 789 * 790 * We have to use vget to clear any inactive state on the vnode, 791 * otherwise the vnode may remain inactive and thus tmpfs_inactive 792 * will not get called when we release it. 793 */ 794 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 795 KKASSERT(error == 0); 796 vn_unlock(vp); 797 798 if (vp->v_type == VDIR) { 799 error = EISDIR; 800 goto out; 801 } 802 803 dnode = VP_TO_TMPFS_DIR(dvp); 804 node = VP_TO_TMPFS_NODE(vp); 805 tmp = VFS_TO_TMPFS(vp->v_mount); 806 de = tmpfs_dir_lookup(dnode, node, ncp); 807 if (de == NULL) { 808 error = ENOENT; 809 goto out; 810 } 811 812 /* Files marked as immutable or append-only cannot be deleted. */ 813 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 814 (dnode->tn_flags & APPEND)) { 815 error = EPERM; 816 goto out; 817 } 818 819 /* Remove the entry from the directory; as it is a file, we do not 820 * have to change the number of hard links of the directory. */ 821 tmpfs_dir_detach(dnode, de); 822 823 /* Free the directory entry we just deleted. Note that the node 824 * referred by it will not be removed until the vnode is really 825 * reclaimed. */ 826 tmpfs_free_dirent(tmp, de); 827 828 if (node->tn_links > 0) { 829 TMPFS_NODE_LOCK(node); 830 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 831 TMPFS_NODE_MODIFIED; 832 TMPFS_NODE_UNLOCK(node); 833 } 834 835 cache_unlink(v->a_nch); 836 tmpfs_knote(vp, NOTE_DELETE); 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, *tde; 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 } else { 1045 RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de); 1046 } 1047 1048 /* 1049 * Handle any name change. Swap with newname, we will 1050 * deallocate it at the end. 1051 */ 1052 if (newname != NULL) { 1053 #if 0 1054 TMPFS_NODE_LOCK(fnode); 1055 fnode->tn_status |= TMPFS_NODE_CHANGED; 1056 TMPFS_NODE_UNLOCK(fnode); 1057 #endif 1058 oldname = de->td_name; 1059 de->td_name = newname; 1060 de->td_namelen = (uint16_t)tncp->nc_nlen; 1061 newname = oldname; 1062 } 1063 1064 /* 1065 * If we are overwriting an entry, we have to remove the old one 1066 * from the target directory. 1067 */ 1068 if (tvp != NULL) { 1069 /* Remove the old entry from the target directory. */ 1070 tde = tmpfs_dir_lookup(tdnode, tnode, tncp); 1071 tmpfs_dir_detach(tdnode, tde); 1072 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1073 1074 /* 1075 * Free the directory entry we just deleted. Note that the 1076 * node referred by it will not be removed until the vnode is 1077 * really reclaimed. 1078 */ 1079 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1080 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1081 } 1082 1083 /* 1084 * Link entry to target directory. If the entry 1085 * represents a directory move the parent linkage 1086 * as well. 1087 */ 1088 if (fdnode != tdnode) { 1089 if (de->td_node->tn_type == VDIR) { 1090 TMPFS_VALIDATE_DIR(fnode); 1091 } 1092 tmpfs_dir_attach(tdnode, de); 1093 } else { 1094 TMPFS_NODE_LOCK(tdnode); 1095 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1096 RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de); 1097 TMPFS_NODE_UNLOCK(tdnode); 1098 } 1099 1100 /* 1101 * Finish up 1102 */ 1103 if (newname) { 1104 kfree(newname, tmp->tm_name_zone); 1105 newname = NULL; 1106 } 1107 cache_rename(v->a_fnch, v->a_tnch); 1108 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1109 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1110 if (fnode->tn_vnode) 1111 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1112 error = 0; 1113 1114 out_locked: 1115 ; 1116 1117 out: 1118 if (tvp) 1119 vrele(tvp); 1120 1121 return error; 1122 } 1123 1124 /* --------------------------------------------------------------------- */ 1125 1126 static int 1127 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1128 { 1129 struct vnode *dvp = v->a_dvp; 1130 struct vnode **vpp = v->a_vpp; 1131 struct namecache *ncp = v->a_nch->ncp; 1132 struct vattr *vap = v->a_vap; 1133 struct ucred *cred = v->a_cred; 1134 int error; 1135 1136 KKASSERT(vap->va_type == VDIR); 1137 1138 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1139 if (error == 0) { 1140 cache_setunresolved(v->a_nch); 1141 cache_setvp(v->a_nch, *vpp); 1142 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1143 } 1144 1145 return error; 1146 } 1147 1148 /* --------------------------------------------------------------------- */ 1149 1150 static int 1151 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1152 { 1153 struct vnode *dvp = v->a_dvp; 1154 struct namecache *ncp = v->a_nch->ncp; 1155 struct vnode *vp; 1156 struct tmpfs_dirent *de; 1157 struct tmpfs_mount *tmp; 1158 struct tmpfs_node *dnode; 1159 struct tmpfs_node *node; 1160 int error; 1161 1162 /* 1163 * We have to acquire the vp from v->a_nch because we will likely 1164 * unresolve the namecache entry, and a vrele/vput is needed to 1165 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 1166 * 1167 * We have to use vget to clear any inactive state on the vnode, 1168 * otherwise the vnode may remain inactive and thus tmpfs_inactive 1169 * will not get called when we release it. 1170 */ 1171 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 1172 KKASSERT(error == 0); 1173 vn_unlock(vp); 1174 1175 /* 1176 * Prevalidate so we don't hit an assertion later 1177 */ 1178 if (vp->v_type != VDIR) { 1179 error = ENOTDIR; 1180 goto out; 1181 } 1182 1183 tmp = VFS_TO_TMPFS(dvp->v_mount); 1184 dnode = VP_TO_TMPFS_DIR(dvp); 1185 node = VP_TO_TMPFS_DIR(vp); 1186 1187 /* Directories with more than two entries ('.' and '..') cannot be 1188 * removed. */ 1189 if (node->tn_size > 0) { 1190 error = ENOTEMPTY; 1191 goto out; 1192 } 1193 1194 if ((dnode->tn_flags & APPEND) 1195 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1196 error = EPERM; 1197 goto out; 1198 } 1199 1200 /* This invariant holds only if we are not trying to remove "..". 1201 * We checked for that above so this is safe now. */ 1202 KKASSERT(node->tn_dir.tn_parent == dnode); 1203 1204 /* Get the directory entry associated with node (vp). This was 1205 * filled by tmpfs_lookup while looking up the entry. */ 1206 de = tmpfs_dir_lookup(dnode, node, ncp); 1207 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1208 ncp->nc_name, 1209 ncp->nc_nlen)); 1210 1211 /* Check flags to see if we are allowed to remove the directory. */ 1212 if ((dnode->tn_flags & APPEND) || 1213 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1214 error = EPERM; 1215 goto out; 1216 } 1217 1218 1219 /* Detach the directory entry from the directory (dnode). */ 1220 tmpfs_dir_detach(dnode, de); 1221 1222 /* No vnode should be allocated for this entry from this point */ 1223 TMPFS_NODE_LOCK(node); 1224 TMPFS_ASSERT_ELOCKED(node); 1225 TMPFS_NODE_LOCK(dnode); 1226 TMPFS_ASSERT_ELOCKED(dnode); 1227 1228 /* 1229 * Must set parent linkage to NULL (tested by ncreate to disallow 1230 * the creation of new files/dirs in a deleted directory) 1231 */ 1232 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1233 TMPFS_NODE_MODIFIED; 1234 1235 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1236 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1237 1238 TMPFS_NODE_UNLOCK(dnode); 1239 TMPFS_NODE_UNLOCK(node); 1240 1241 /* Free the directory entry we just deleted. Note that the node 1242 * referred by it will not be removed until the vnode is really 1243 * reclaimed. */ 1244 tmpfs_free_dirent(tmp, de); 1245 1246 /* Release the deleted vnode (will destroy the node, notify 1247 * interested parties and clean it from the cache). */ 1248 1249 TMPFS_NODE_LOCK(dnode); 1250 dnode->tn_status |= TMPFS_NODE_CHANGED; 1251 TMPFS_NODE_UNLOCK(dnode); 1252 tmpfs_update(dvp); 1253 1254 cache_unlink(v->a_nch); 1255 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1256 error = 0; 1257 1258 out: 1259 vrele(vp); 1260 1261 return error; 1262 } 1263 1264 /* --------------------------------------------------------------------- */ 1265 1266 static int 1267 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1268 { 1269 struct vnode *dvp = v->a_dvp; 1270 struct vnode **vpp = v->a_vpp; 1271 struct namecache *ncp = v->a_nch->ncp; 1272 struct vattr *vap = v->a_vap; 1273 struct ucred *cred = v->a_cred; 1274 char *target = v->a_target; 1275 int error; 1276 1277 vap->va_type = VLNK; 1278 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1279 if (error == 0) { 1280 tmpfs_knote(*vpp, NOTE_WRITE); 1281 cache_setunresolved(v->a_nch); 1282 cache_setvp(v->a_nch, *vpp); 1283 } 1284 1285 return error; 1286 } 1287 1288 /* --------------------------------------------------------------------- */ 1289 1290 static int 1291 tmpfs_readdir(struct vop_readdir_args *v) 1292 { 1293 struct vnode *vp = v->a_vp; 1294 struct uio *uio = v->a_uio; 1295 int *eofflag = v->a_eofflag; 1296 off_t **cookies = v->a_cookies; 1297 int *ncookies = v->a_ncookies; 1298 struct tmpfs_mount *tmp; 1299 int error; 1300 off_t startoff; 1301 off_t cnt = 0; 1302 struct tmpfs_node *node; 1303 1304 /* This operation only makes sense on directory nodes. */ 1305 if (vp->v_type != VDIR) 1306 return ENOTDIR; 1307 1308 tmp = VFS_TO_TMPFS(vp->v_mount); 1309 node = VP_TO_TMPFS_DIR(vp); 1310 startoff = uio->uio_offset; 1311 1312 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1313 error = tmpfs_dir_getdotdent(node, uio); 1314 if (error != 0) 1315 goto outok; 1316 cnt++; 1317 } 1318 1319 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1320 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1321 if (error != 0) 1322 goto outok; 1323 cnt++; 1324 } 1325 1326 error = tmpfs_dir_getdents(node, uio, &cnt); 1327 1328 outok: 1329 KKASSERT(error >= -1); 1330 1331 if (error == -1) 1332 error = 0; 1333 1334 if (eofflag != NULL) 1335 *eofflag = 1336 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1337 1338 /* Update NFS-related variables. */ 1339 if (error == 0 && cookies != NULL && ncookies != NULL) { 1340 off_t i; 1341 off_t off = startoff; 1342 struct tmpfs_dirent *de = NULL; 1343 1344 *ncookies = cnt; 1345 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1346 1347 for (i = 0; i < cnt; i++) { 1348 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1349 if (off == TMPFS_DIRCOOKIE_DOT) { 1350 off = TMPFS_DIRCOOKIE_DOTDOT; 1351 } else { 1352 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1353 de = RB_MIN(tmpfs_dirtree, &node->tn_dir.tn_dirtree); 1354 } else if (de != NULL) { 1355 de = RB_NEXT(tmpfs_dirtree, &node->tn_dir.tn_dirtree, de); 1356 } else { 1357 de = tmpfs_dir_lookupbycookie(node, 1358 off); 1359 KKASSERT(de != NULL); 1360 de = RB_NEXT(tmpfs_dirtree, &node->tn_dir.tn_dirtree, de); 1361 } 1362 if (de == NULL) 1363 off = TMPFS_DIRCOOKIE_EOF; 1364 else 1365 off = tmpfs_dircookie(de); 1366 } 1367 1368 (*cookies)[i] = off; 1369 } 1370 KKASSERT(uio->uio_offset == off); 1371 } 1372 1373 return error; 1374 } 1375 1376 /* --------------------------------------------------------------------- */ 1377 1378 static int 1379 tmpfs_readlink(struct vop_readlink_args *v) 1380 { 1381 struct vnode *vp = v->a_vp; 1382 struct uio *uio = v->a_uio; 1383 1384 int error; 1385 struct tmpfs_node *node; 1386 1387 KKASSERT(uio->uio_offset == 0); 1388 KKASSERT(vp->v_type == VLNK); 1389 1390 node = VP_TO_TMPFS_NODE(vp); 1391 1392 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1393 uio); 1394 TMPFS_NODE_LOCK(node); 1395 node->tn_status |= TMPFS_NODE_ACCESSED; 1396 TMPFS_NODE_UNLOCK(node); 1397 1398 return error; 1399 } 1400 1401 /* --------------------------------------------------------------------- */ 1402 1403 static int 1404 tmpfs_inactive(struct vop_inactive_args *v) 1405 { 1406 struct vnode *vp = v->a_vp; 1407 struct tmpfs_node *node; 1408 1409 node = VP_TO_TMPFS_NODE(vp); 1410 1411 /* 1412 * Degenerate case 1413 */ 1414 if (node == NULL) { 1415 vrecycle(vp); 1416 return(0); 1417 } 1418 1419 /* 1420 * Get rid of unreferenced deleted vnodes sooner rather than 1421 * later so the data memory can be recovered immediately. 1422 * 1423 * We must truncate the vnode to prevent the normal reclamation 1424 * path from flushing the data for the removed file to disk. 1425 */ 1426 TMPFS_NODE_LOCK(node); 1427 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1428 node->tn_links == 0) 1429 { 1430 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1431 TMPFS_NODE_UNLOCK(node); 1432 if (node->tn_type == VREG) 1433 tmpfs_truncate(vp, 0); 1434 vrecycle(vp); 1435 } else { 1436 TMPFS_NODE_UNLOCK(node); 1437 } 1438 1439 return 0; 1440 } 1441 1442 /* --------------------------------------------------------------------- */ 1443 1444 int 1445 tmpfs_reclaim(struct vop_reclaim_args *v) 1446 { 1447 struct vnode *vp = v->a_vp; 1448 struct tmpfs_mount *tmp; 1449 struct tmpfs_node *node; 1450 1451 node = VP_TO_TMPFS_NODE(vp); 1452 tmp = VFS_TO_TMPFS(vp->v_mount); 1453 1454 tmpfs_free_vp(vp); 1455 1456 /* 1457 * If the node referenced by this vnode was deleted by the 1458 * user, we must free its associated data structures now that 1459 * the vnode is being reclaimed. 1460 * 1461 * Directories have an extra link ref. 1462 */ 1463 TMPFS_NODE_LOCK(node); 1464 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1465 node->tn_links == 0) { 1466 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1467 tmpfs_free_node(tmp, node); 1468 /* eats the lock */ 1469 } else { 1470 TMPFS_NODE_UNLOCK(node); 1471 } 1472 1473 KKASSERT(vp->v_data == NULL); 1474 return 0; 1475 } 1476 1477 /* --------------------------------------------------------------------- */ 1478 1479 static int 1480 tmpfs_mountctl(struct vop_mountctl_args *ap) 1481 { 1482 struct tmpfs_mount *tmp; 1483 struct mount *mp; 1484 int rc; 1485 1486 switch (ap->a_op) { 1487 case (MOUNTCTL_SET_EXPORT): 1488 mp = ap->a_head.a_ops->head.vv_mount; 1489 tmp = (struct tmpfs_mount *) mp->mnt_data; 1490 1491 if (ap->a_ctllen != sizeof(struct export_args)) 1492 rc = (EINVAL); 1493 else 1494 rc = vfs_export(mp, &tmp->tm_export, 1495 (const struct export_args *) ap->a_ctl); 1496 break; 1497 default: 1498 rc = vop_stdmountctl(ap); 1499 break; 1500 } 1501 return (rc); 1502 } 1503 1504 /* --------------------------------------------------------------------- */ 1505 1506 static int 1507 tmpfs_print(struct vop_print_args *v) 1508 { 1509 struct vnode *vp = v->a_vp; 1510 1511 struct tmpfs_node *node; 1512 1513 node = VP_TO_TMPFS_NODE(vp); 1514 1515 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1516 node, node->tn_flags, node->tn_links); 1517 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1518 node->tn_mode, node->tn_uid, node->tn_gid, 1519 (uintmax_t)node->tn_size, node->tn_status); 1520 1521 if (vp->v_type == VFIFO) 1522 fifo_printinfo(vp); 1523 1524 kprintf("\n"); 1525 1526 return 0; 1527 } 1528 1529 /* --------------------------------------------------------------------- */ 1530 1531 static int 1532 tmpfs_pathconf(struct vop_pathconf_args *v) 1533 { 1534 int name = v->a_name; 1535 register_t *retval = v->a_retval; 1536 1537 int error; 1538 1539 error = 0; 1540 1541 switch (name) { 1542 case _PC_LINK_MAX: 1543 *retval = LINK_MAX; 1544 break; 1545 1546 case _PC_NAME_MAX: 1547 *retval = NAME_MAX; 1548 break; 1549 1550 case _PC_PATH_MAX: 1551 *retval = PATH_MAX; 1552 break; 1553 1554 case _PC_PIPE_BUF: 1555 *retval = PIPE_BUF; 1556 break; 1557 1558 case _PC_CHOWN_RESTRICTED: 1559 *retval = 1; 1560 break; 1561 1562 case _PC_NO_TRUNC: 1563 *retval = 1; 1564 break; 1565 1566 case _PC_SYNC_IO: 1567 *retval = 1; 1568 break; 1569 1570 case _PC_FILESIZEBITS: 1571 *retval = 0; /* XXX Don't know which value should I return. */ 1572 break; 1573 1574 default: 1575 error = EINVAL; 1576 } 1577 1578 return error; 1579 } 1580 1581 /************************************************************************ 1582 * KQFILTER OPS * 1583 ************************************************************************/ 1584 1585 static void filt_tmpfsdetach(struct knote *kn); 1586 static int filt_tmpfsread(struct knote *kn, long hint); 1587 static int filt_tmpfswrite(struct knote *kn, long hint); 1588 static int filt_tmpfsvnode(struct knote *kn, long hint); 1589 1590 static struct filterops tmpfsread_filtops = 1591 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1592 static struct filterops tmpfswrite_filtops = 1593 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1594 static struct filterops tmpfsvnode_filtops = 1595 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1596 1597 static int 1598 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1599 { 1600 struct vnode *vp = ap->a_vp; 1601 struct knote *kn = ap->a_kn; 1602 1603 switch (kn->kn_filter) { 1604 case EVFILT_READ: 1605 kn->kn_fop = &tmpfsread_filtops; 1606 break; 1607 case EVFILT_WRITE: 1608 kn->kn_fop = &tmpfswrite_filtops; 1609 break; 1610 case EVFILT_VNODE: 1611 kn->kn_fop = &tmpfsvnode_filtops; 1612 break; 1613 default: 1614 return (EOPNOTSUPP); 1615 } 1616 1617 kn->kn_hook = (caddr_t)vp; 1618 1619 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1620 1621 return(0); 1622 } 1623 1624 static void 1625 filt_tmpfsdetach(struct knote *kn) 1626 { 1627 struct vnode *vp = (void *)kn->kn_hook; 1628 1629 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1630 } 1631 1632 static int 1633 filt_tmpfsread(struct knote *kn, long hint) 1634 { 1635 struct vnode *vp = (void *)kn->kn_hook; 1636 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1637 off_t off; 1638 1639 if (hint == NOTE_REVOKE) { 1640 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1641 return(1); 1642 } 1643 1644 /* 1645 * Interlock against MP races when performing this function. 1646 */ 1647 lwkt_gettoken(&vp->v_mount->mnt_token); 1648 off = node->tn_size - kn->kn_fp->f_offset; 1649 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1650 if (kn->kn_sfflags & NOTE_OLDAPI) { 1651 lwkt_reltoken(&vp->v_mount->mnt_token); 1652 return(1); 1653 } 1654 1655 if (kn->kn_data == 0) { 1656 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1657 } 1658 lwkt_reltoken(&vp->v_mount->mnt_token); 1659 return (kn->kn_data != 0); 1660 } 1661 1662 static int 1663 filt_tmpfswrite(struct knote *kn, long hint) 1664 { 1665 if (hint == NOTE_REVOKE) 1666 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1667 kn->kn_data = 0; 1668 return (1); 1669 } 1670 1671 static int 1672 filt_tmpfsvnode(struct knote *kn, long hint) 1673 { 1674 if (kn->kn_sfflags & hint) 1675 kn->kn_fflags |= hint; 1676 if (hint == NOTE_REVOKE) { 1677 kn->kn_flags |= (EV_EOF | EV_NODATA); 1678 return (1); 1679 } 1680 return (kn->kn_fflags != 0); 1681 } 1682 1683 1684 /* --------------------------------------------------------------------- */ 1685 1686 /* 1687 * vnode operations vector used for files stored in a tmpfs file system. 1688 */ 1689 struct vop_ops tmpfs_vnode_vops = { 1690 .vop_default = vop_defaultop, 1691 .vop_getpages = vop_stdgetpages, 1692 .vop_putpages = vop_stdputpages, 1693 .vop_ncreate = tmpfs_ncreate, 1694 .vop_nresolve = tmpfs_nresolve, 1695 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1696 .vop_nmknod = tmpfs_nmknod, 1697 .vop_open = tmpfs_open, 1698 .vop_close = tmpfs_close, 1699 .vop_access = tmpfs_access, 1700 .vop_getattr = tmpfs_getattr, 1701 .vop_setattr = tmpfs_setattr, 1702 .vop_read = tmpfs_read, 1703 .vop_write = tmpfs_write, 1704 .vop_fsync = tmpfs_fsync, 1705 .vop_mountctl = tmpfs_mountctl, 1706 .vop_nremove = tmpfs_nremove, 1707 .vop_nlink = tmpfs_nlink, 1708 .vop_nrename = tmpfs_nrename, 1709 .vop_nmkdir = tmpfs_nmkdir, 1710 .vop_nrmdir = tmpfs_nrmdir, 1711 .vop_nsymlink = tmpfs_nsymlink, 1712 .vop_readdir = tmpfs_readdir, 1713 .vop_readlink = tmpfs_readlink, 1714 .vop_inactive = tmpfs_inactive, 1715 .vop_reclaim = tmpfs_reclaim, 1716 .vop_print = tmpfs_print, 1717 .vop_pathconf = tmpfs_pathconf, 1718 .vop_bmap = tmpfs_bmap, 1719 .vop_strategy = tmpfs_strategy, 1720 .vop_advlock = tmpfs_advlock, 1721 .vop_kqfilter = tmpfs_kqfilter 1722 }; 1723