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); 457 if (bp == NULL) 458 { 459 lwkt_gettoken(&vp->v_mount->mnt_token); 460 error = bread(vp, base_offset, BSIZE, &bp); 461 if (error) { 462 brelse(bp); 463 lwkt_reltoken(&vp->v_mount->mnt_token); 464 kprintf("tmpfs_read bread error %d\n", error); 465 break; 466 } 467 lwkt_reltoken(&vp->v_mount->mnt_token); 468 } 469 470 /* 471 * Figure out how many bytes we can actually copy this loop. 472 */ 473 len = BSIZE - offset; 474 if (len > uio->uio_resid) 475 len = uio->uio_resid; 476 if (len > node->tn_size - uio->uio_offset) 477 len = (size_t)(node->tn_size - uio->uio_offset); 478 479 error = uiomove((char *)bp->b_data + offset, len, uio); 480 bqrelse(bp); 481 if (error) { 482 kprintf("tmpfs_read uiomove error %d\n", error); 483 break; 484 } 485 } 486 487 TMPFS_NODE_LOCK(node); 488 node->tn_status |= TMPFS_NODE_ACCESSED; 489 TMPFS_NODE_UNLOCK(node); 490 491 return(error); 492 } 493 494 static int 495 tmpfs_write (struct vop_write_args *ap) 496 { 497 struct buf *bp; 498 struct vnode *vp = ap->a_vp; 499 struct uio *uio = ap->a_uio; 500 struct thread *td = uio->uio_td; 501 struct tmpfs_node *node; 502 boolean_t extended; 503 off_t oldsize; 504 int error; 505 off_t base_offset; 506 size_t offset; 507 size_t len; 508 struct rlimit limit; 509 int trivial = 0; 510 int kflags = 0; 511 512 error = 0; 513 if (uio->uio_resid == 0) { 514 return error; 515 } 516 517 node = VP_TO_TMPFS_NODE(vp); 518 519 if (vp->v_type != VREG) 520 return (EINVAL); 521 522 lwkt_gettoken(&vp->v_mount->mnt_token); 523 524 oldsize = node->tn_size; 525 if (ap->a_ioflag & IO_APPEND) 526 uio->uio_offset = node->tn_size; 527 528 /* 529 * Check for illegal write offsets. 530 */ 531 if (uio->uio_offset + uio->uio_resid > 532 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 533 lwkt_reltoken(&vp->v_mount->mnt_token); 534 return (EFBIG); 535 } 536 537 if (vp->v_type == VREG && td != NULL) { 538 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 539 if (error != 0) { 540 lwkt_reltoken(&vp->v_mount->mnt_token); 541 return error; 542 } 543 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 544 ksignal(td->td_proc, SIGXFSZ); 545 lwkt_reltoken(&vp->v_mount->mnt_token); 546 return (EFBIG); 547 } 548 } 549 550 551 /* 552 * Extend the file's size if necessary 553 */ 554 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 555 556 while (uio->uio_resid > 0) { 557 /* 558 * Use buffer cache I/O (via tmpfs_strategy) 559 */ 560 offset = (size_t)uio->uio_offset & BMASK; 561 base_offset = (off_t)uio->uio_offset - offset; 562 len = BSIZE - offset; 563 if (len > uio->uio_resid) 564 len = uio->uio_resid; 565 566 if ((uio->uio_offset + len) > node->tn_size) { 567 trivial = (uio->uio_offset <= node->tn_size); 568 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); 569 if (error) 570 break; 571 } 572 573 /* 574 * Read to fill in any gaps. Theoretically we could 575 * optimize this if the write covers the entire buffer 576 * and is not a UIO_NOCOPY write, however this can lead 577 * to a security violation exposing random kernel memory 578 * (whatever junk was in the backing VM pages before). 579 * 580 * So just use bread() to do the right thing. 581 */ 582 error = bread(vp, base_offset, BSIZE, &bp); 583 error = uiomove((char *)bp->b_data + offset, len, uio); 584 if (error) { 585 kprintf("tmpfs_write uiomove error %d\n", error); 586 brelse(bp); 587 break; 588 } 589 590 if (uio->uio_offset > node->tn_size) { 591 node->tn_size = uio->uio_offset; 592 kflags |= NOTE_EXTEND; 593 } 594 kflags |= NOTE_WRITE; 595 596 /* 597 * Always try to flush the page if the request is coming 598 * from the pageout daemon (IO_ASYNC), else buwrite() the 599 * buffer. 600 * 601 * buwrite() dirties the underlying VM pages instead of 602 * dirtying the buffer, releasing the buffer as a clean 603 * buffer. This allows tmpfs to use essentially all 604 * available memory to cache file data. If we used bdwrite() 605 * the buffer cache would wind up flushing the data to 606 * swap too quickly. 607 */ 608 bp->b_flags |= B_AGE; 609 if (ap->a_ioflag & IO_ASYNC) { 610 bawrite(bp); 611 } else { 612 buwrite(bp); 613 } 614 615 if (bp->b_error) { 616 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 617 break; 618 } 619 } 620 621 if (error) { 622 if (extended) { 623 (void)tmpfs_reg_resize(vp, oldsize, trivial); 624 kflags &= ~NOTE_EXTEND; 625 } 626 goto done; 627 } 628 629 /* 630 * Currently we don't set the mtime on files modified via mmap() 631 * because we can't tell the difference between those modifications 632 * and an attempt by the pageout daemon to flush tmpfs pages to 633 * swap. 634 * 635 * This is because in order to defer flushes as long as possible 636 * buwrite() works by marking the underlying VM pages dirty in 637 * order to be able to dispose of the buffer cache buffer without 638 * flushing it. 639 */ 640 TMPFS_NODE_LOCK(node); 641 if (uio->uio_segflg != UIO_NOCOPY) 642 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED; 643 if (extended) 644 node->tn_status |= TMPFS_NODE_CHANGED; 645 646 if (node->tn_mode & (S_ISUID | S_ISGID)) { 647 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 648 node->tn_mode &= ~(S_ISUID | S_ISGID); 649 } 650 TMPFS_NODE_UNLOCK(node); 651 done: 652 653 tmpfs_knote(vp, kflags); 654 655 656 lwkt_reltoken(&vp->v_mount->mnt_token); 657 return(error); 658 } 659 660 static int 661 tmpfs_advlock (struct vop_advlock_args *ap) 662 { 663 struct tmpfs_node *node; 664 struct vnode *vp = ap->a_vp; 665 666 node = VP_TO_TMPFS_NODE(vp); 667 668 return (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 669 } 670 671 /* 672 * The strategy function is typically only called when memory pressure 673 * forces the system to attempt to pageout pages. It can also be called 674 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write 675 * operations 676 */ 677 static int 678 tmpfs_strategy(struct vop_strategy_args *ap) 679 { 680 struct bio *bio = ap->a_bio; 681 struct bio *nbio; 682 struct buf *bp = bio->bio_buf; 683 struct vnode *vp = ap->a_vp; 684 struct tmpfs_node *node; 685 vm_object_t uobj; 686 vm_page_t m; 687 int i; 688 689 if (vp->v_type != VREG) { 690 bp->b_resid = bp->b_bcount; 691 bp->b_flags |= B_ERROR | B_INVAL; 692 bp->b_error = EINVAL; 693 biodone(bio); 694 return(0); 695 } 696 697 lwkt_gettoken(&vp->v_mount->mnt_token); 698 node = VP_TO_TMPFS_NODE(vp); 699 700 uobj = node->tn_reg.tn_aobj; 701 702 /* 703 * Don't bother flushing to swap if there is no swap, just 704 * ensure that the pages are marked as needing a commit (still). 705 */ 706 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { 707 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 708 m = bp->b_xio.xio_pages[i]; 709 vm_page_need_commit(m); 710 } 711 bp->b_resid = 0; 712 bp->b_error = 0; 713 biodone(bio); 714 } else { 715 nbio = push_bio(bio); 716 nbio->bio_done = tmpfs_strategy_done; 717 nbio->bio_offset = bio->bio_offset; 718 swap_pager_strategy(uobj, nbio); 719 } 720 721 lwkt_reltoken(&vp->v_mount->mnt_token); 722 return 0; 723 } 724 725 /* 726 * If we were unable to commit the pages to swap make sure they are marked 727 * as needing a commit (again). If we were, clear the flag to allow the 728 * pages to be freed. 729 */ 730 static void 731 tmpfs_strategy_done(struct bio *bio) 732 { 733 struct buf *bp; 734 vm_page_t m; 735 int i; 736 737 bp = bio->bio_buf; 738 739 if (bp->b_flags & B_ERROR) { 740 bp->b_flags &= ~B_ERROR; 741 bp->b_error = 0; 742 bp->b_resid = 0; 743 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 744 m = bp->b_xio.xio_pages[i]; 745 vm_page_need_commit(m); 746 } 747 } else { 748 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 749 m = bp->b_xio.xio_pages[i]; 750 vm_page_clear_commit(m); 751 } 752 } 753 bio = pop_bio(bio); 754 biodone(bio); 755 } 756 757 static int 758 tmpfs_bmap(struct vop_bmap_args *ap) 759 { 760 if (ap->a_doffsetp != NULL) 761 *ap->a_doffsetp = ap->a_loffset; 762 if (ap->a_runp != NULL) 763 *ap->a_runp = 0; 764 if (ap->a_runb != NULL) 765 *ap->a_runb = 0; 766 767 return 0; 768 } 769 770 /* --------------------------------------------------------------------- */ 771 772 static int 773 tmpfs_nremove(struct vop_nremove_args *v) 774 { 775 struct vnode *dvp = v->a_dvp; 776 struct namecache *ncp = v->a_nch->ncp; 777 struct vnode *vp; 778 int error; 779 struct tmpfs_dirent *de; 780 struct tmpfs_mount *tmp; 781 struct tmpfs_node *dnode; 782 struct tmpfs_node *node; 783 784 /* 785 * We have to acquire the vp from v->a_nch because we will likely 786 * unresolve the namecache entry, and a vrele/vput is needed to 787 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 788 * 789 * We have to use vget to clear any inactive state on the vnode, 790 * otherwise the vnode may remain inactive and thus tmpfs_inactive 791 * will not get called when we release it. 792 */ 793 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 794 KKASSERT(error == 0); 795 vn_unlock(vp); 796 797 if (vp->v_type == VDIR) { 798 error = EISDIR; 799 goto out; 800 } 801 802 dnode = VP_TO_TMPFS_DIR(dvp); 803 node = VP_TO_TMPFS_NODE(vp); 804 tmp = VFS_TO_TMPFS(vp->v_mount); 805 de = tmpfs_dir_lookup(dnode, node, ncp); 806 if (de == NULL) { 807 error = ENOENT; 808 goto out; 809 } 810 811 /* Files marked as immutable or append-only cannot be deleted. */ 812 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 813 (dnode->tn_flags & APPEND)) { 814 error = EPERM; 815 goto out; 816 } 817 818 /* Remove the entry from the directory; as it is a file, we do not 819 * have to change the number of hard links of the directory. */ 820 tmpfs_dir_detach(dnode, de); 821 822 /* Free the directory entry we just deleted. Note that the node 823 * referred by it will not be removed until the vnode is really 824 * reclaimed. */ 825 tmpfs_free_dirent(tmp, de); 826 827 if (node->tn_links > 0) { 828 TMPFS_NODE_LOCK(node); 829 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 830 TMPFS_NODE_MODIFIED; 831 TMPFS_NODE_UNLOCK(node); 832 } 833 834 cache_setunresolved(v->a_nch); 835 cache_setvp(v->a_nch, NULL); 836 tmpfs_knote(vp, NOTE_DELETE); 837 /*cache_inval_vp(vp, CINV_DESTROY);*/ 838 tmpfs_knote(dvp, NOTE_WRITE); 839 error = 0; 840 841 out: 842 vrele(vp); 843 844 return error; 845 } 846 847 /* --------------------------------------------------------------------- */ 848 849 static int 850 tmpfs_nlink(struct vop_nlink_args *v) 851 { 852 struct vnode *dvp = v->a_dvp; 853 struct vnode *vp = v->a_vp; 854 struct namecache *ncp = v->a_nch->ncp; 855 struct tmpfs_dirent *de; 856 struct tmpfs_node *node; 857 struct tmpfs_node *dnode; 858 int error; 859 860 KKASSERT(dvp != vp); /* XXX When can this be false? */ 861 862 node = VP_TO_TMPFS_NODE(vp); 863 dnode = VP_TO_TMPFS_NODE(dvp); 864 865 /* XXX: Why aren't the following two tests done by the caller? */ 866 867 /* Hard links of directories are forbidden. */ 868 if (vp->v_type == VDIR) { 869 error = EPERM; 870 goto out; 871 } 872 873 /* Cannot create cross-device links. */ 874 if (dvp->v_mount != vp->v_mount) { 875 error = EXDEV; 876 goto out; 877 } 878 879 /* Ensure that we do not overflow the maximum number of links imposed 880 * by the system. */ 881 KKASSERT(node->tn_links <= LINK_MAX); 882 if (node->tn_links == LINK_MAX) { 883 error = EMLINK; 884 goto out; 885 } 886 887 /* We cannot create links of files marked immutable or append-only. */ 888 if (node->tn_flags & (IMMUTABLE | APPEND)) { 889 error = EPERM; 890 goto out; 891 } 892 893 /* Allocate a new directory entry to represent the node. */ 894 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 895 ncp->nc_name, ncp->nc_nlen, &de); 896 if (error != 0) 897 goto out; 898 899 /* Insert the new directory entry into the appropriate directory. */ 900 tmpfs_dir_attach(dnode, de); 901 902 /* vp link count has changed, so update node times. */ 903 904 TMPFS_NODE_LOCK(node); 905 node->tn_status |= TMPFS_NODE_CHANGED; 906 TMPFS_NODE_UNLOCK(node); 907 tmpfs_update(vp); 908 909 tmpfs_knote(vp, NOTE_LINK); 910 cache_setunresolved(v->a_nch); 911 cache_setvp(v->a_nch, vp); 912 tmpfs_knote(dvp, NOTE_WRITE); 913 error = 0; 914 915 out: 916 return error; 917 } 918 919 /* --------------------------------------------------------------------- */ 920 921 static int 922 tmpfs_nrename(struct vop_nrename_args *v) 923 { 924 struct vnode *fdvp = v->a_fdvp; 925 struct namecache *fncp = v->a_fnch->ncp; 926 struct vnode *fvp = fncp->nc_vp; 927 struct vnode *tdvp = v->a_tdvp; 928 struct namecache *tncp = v->a_tnch->ncp; 929 struct vnode *tvp; 930 struct tmpfs_dirent *de; 931 struct tmpfs_mount *tmp; 932 struct tmpfs_node *fdnode; 933 struct tmpfs_node *fnode; 934 struct tmpfs_node *tnode; 935 struct tmpfs_node *tdnode; 936 char *newname; 937 char *oldname; 938 int error; 939 940 /* 941 * Because tvp can get overwritten we have to vget it instead of 942 * just vref or use it, otherwise it's VINACTIVE flag may not get 943 * cleared and the node won't get destroyed. 944 */ 945 error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp); 946 if (error == 0) { 947 tnode = VP_TO_TMPFS_NODE(tvp); 948 vn_unlock(tvp); 949 } else { 950 tnode = NULL; 951 } 952 953 /* Disallow cross-device renames. 954 * XXX Why isn't this done by the caller? */ 955 if (fvp->v_mount != tdvp->v_mount || 956 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 957 error = EXDEV; 958 goto out; 959 } 960 961 tmp = VFS_TO_TMPFS(tdvp->v_mount); 962 tdnode = VP_TO_TMPFS_DIR(tdvp); 963 964 /* If source and target are the same file, there is nothing to do. */ 965 if (fvp == tvp) { 966 error = 0; 967 goto out; 968 } 969 970 fdnode = VP_TO_TMPFS_DIR(fdvp); 971 fnode = VP_TO_TMPFS_NODE(fvp); 972 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 973 974 /* Avoid manipulating '.' and '..' entries. */ 975 if (de == NULL) { 976 error = ENOENT; 977 goto out_locked; 978 } 979 KKASSERT(de->td_node == fnode); 980 981 /* 982 * If replacing an entry in the target directory and that entry 983 * is a directory, it must be empty. 984 * 985 * Kern_rename gurantees the destination to be a directory 986 * if the source is one (it does?). 987 */ 988 if (tvp != NULL) { 989 KKASSERT(tnode != NULL); 990 991 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 992 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 993 error = EPERM; 994 goto out_locked; 995 } 996 997 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 998 if (tnode->tn_size > 0) { 999 error = ENOTEMPTY; 1000 goto out_locked; 1001 } 1002 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1003 error = ENOTDIR; 1004 goto out_locked; 1005 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1006 error = EISDIR; 1007 goto out_locked; 1008 } else { 1009 KKASSERT(fnode->tn_type != VDIR && 1010 tnode->tn_type != VDIR); 1011 } 1012 } 1013 1014 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1015 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1016 error = EPERM; 1017 goto out_locked; 1018 } 1019 1020 /* 1021 * Ensure that we have enough memory to hold the new name, if it 1022 * has to be changed. 1023 */ 1024 if (fncp->nc_nlen != tncp->nc_nlen || 1025 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 1026 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 1027 M_WAITOK | M_NULLOK); 1028 if (newname == NULL) { 1029 error = ENOSPC; 1030 goto out_locked; 1031 } 1032 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 1033 newname[tncp->nc_nlen] = '\0'; 1034 } else { 1035 newname = NULL; 1036 } 1037 1038 /* 1039 * Unlink entry from source directory. Note that the kernel has 1040 * already checked for illegal recursion cases (renaming a directory 1041 * into a subdirectory of itself). 1042 */ 1043 if (fdnode != tdnode) 1044 tmpfs_dir_detach(fdnode, de); 1045 1046 /* 1047 * Handle any name change. Swap with newname, we will 1048 * deallocate it at the end. 1049 */ 1050 if (newname != NULL) { 1051 #if 0 1052 TMPFS_NODE_LOCK(fnode); 1053 fnode->tn_status |= TMPFS_NODE_CHANGED; 1054 TMPFS_NODE_UNLOCK(fnode); 1055 #endif 1056 oldname = de->td_name; 1057 de->td_name = newname; 1058 de->td_namelen = (uint16_t)tncp->nc_nlen; 1059 newname = oldname; 1060 } 1061 1062 /* 1063 * Link entry to target directory. If the entry 1064 * represents a directory move the parent linkage 1065 * as well. 1066 */ 1067 if (fdnode != tdnode) { 1068 if (de->td_node->tn_type == VDIR) { 1069 TMPFS_VALIDATE_DIR(fnode); 1070 1071 TMPFS_NODE_LOCK(tdnode); 1072 tdnode->tn_links++; 1073 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1074 TMPFS_NODE_UNLOCK(tdnode); 1075 1076 TMPFS_NODE_LOCK(fnode); 1077 fnode->tn_dir.tn_parent = tdnode; 1078 fnode->tn_status |= TMPFS_NODE_CHANGED; 1079 TMPFS_NODE_UNLOCK(fnode); 1080 1081 TMPFS_NODE_LOCK(fdnode); 1082 fdnode->tn_links--; 1083 fdnode->tn_status |= TMPFS_NODE_MODIFIED; 1084 TMPFS_NODE_UNLOCK(fdnode); 1085 } 1086 tmpfs_dir_attach(tdnode, de); 1087 } else { 1088 TMPFS_NODE_LOCK(tdnode); 1089 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1090 TMPFS_NODE_UNLOCK(tdnode); 1091 } 1092 1093 /* 1094 * If we are overwriting an entry, we have to remove the old one 1095 * from the target directory. 1096 */ 1097 if (tvp != NULL) { 1098 /* Remove the old entry from the target directory. */ 1099 de = tmpfs_dir_lookup(tdnode, tnode, tncp); 1100 tmpfs_dir_detach(tdnode, de); 1101 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1102 1103 /* 1104 * Free the directory entry we just deleted. Note that the 1105 * node referred by it will not be removed until the vnode is 1106 * really reclaimed. 1107 */ 1108 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de); 1109 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1110 } 1111 1112 /* 1113 * Finish up 1114 */ 1115 if (newname) { 1116 kfree(newname, tmp->tm_name_zone); 1117 newname = NULL; 1118 } 1119 cache_rename(v->a_fnch, v->a_tnch); 1120 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1121 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1122 if (fnode->tn_vnode) 1123 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1124 error = 0; 1125 1126 out_locked: 1127 ; 1128 1129 out: 1130 if (tvp) 1131 vrele(tvp); 1132 1133 return error; 1134 } 1135 1136 /* --------------------------------------------------------------------- */ 1137 1138 static int 1139 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1140 { 1141 struct vnode *dvp = v->a_dvp; 1142 struct vnode **vpp = v->a_vpp; 1143 struct namecache *ncp = v->a_nch->ncp; 1144 struct vattr *vap = v->a_vap; 1145 struct ucred *cred = v->a_cred; 1146 int error; 1147 1148 KKASSERT(vap->va_type == VDIR); 1149 1150 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1151 if (error == 0) { 1152 cache_setunresolved(v->a_nch); 1153 cache_setvp(v->a_nch, *vpp); 1154 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1155 } 1156 1157 return error; 1158 } 1159 1160 /* --------------------------------------------------------------------- */ 1161 1162 static int 1163 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1164 { 1165 struct vnode *dvp = v->a_dvp; 1166 struct namecache *ncp = v->a_nch->ncp; 1167 struct vnode *vp; 1168 struct tmpfs_dirent *de; 1169 struct tmpfs_mount *tmp; 1170 struct tmpfs_node *dnode; 1171 struct tmpfs_node *node; 1172 int error; 1173 1174 /* 1175 * We have to acquire the vp from v->a_nch because we will likely 1176 * unresolve the namecache entry, and a vrele/vput is needed to 1177 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 1178 * 1179 * We have to use vget to clear any inactive state on the vnode, 1180 * otherwise the vnode may remain inactive and thus tmpfs_inactive 1181 * will not get called when we release it. 1182 */ 1183 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 1184 KKASSERT(error == 0); 1185 vn_unlock(vp); 1186 1187 /* 1188 * Prevalidate so we don't hit an assertion later 1189 */ 1190 if (vp->v_type != VDIR) { 1191 error = ENOTDIR; 1192 goto out; 1193 } 1194 1195 tmp = VFS_TO_TMPFS(dvp->v_mount); 1196 dnode = VP_TO_TMPFS_DIR(dvp); 1197 node = VP_TO_TMPFS_DIR(vp); 1198 1199 /* Directories with more than two entries ('.' and '..') cannot be 1200 * removed. */ 1201 if (node->tn_size > 0) { 1202 error = ENOTEMPTY; 1203 goto out; 1204 } 1205 1206 if ((dnode->tn_flags & APPEND) 1207 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1208 error = EPERM; 1209 goto out; 1210 } 1211 1212 /* This invariant holds only if we are not trying to remove "..". 1213 * We checked for that above so this is safe now. */ 1214 KKASSERT(node->tn_dir.tn_parent == dnode); 1215 1216 /* Get the directory entry associated with node (vp). This was 1217 * filled by tmpfs_lookup while looking up the entry. */ 1218 de = tmpfs_dir_lookup(dnode, node, ncp); 1219 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1220 ncp->nc_name, 1221 ncp->nc_nlen)); 1222 1223 /* Check flags to see if we are allowed to remove the directory. */ 1224 if ((dnode->tn_flags & APPEND) || 1225 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1226 error = EPERM; 1227 goto out; 1228 } 1229 1230 1231 /* Detach the directory entry from the directory (dnode). */ 1232 tmpfs_dir_detach(dnode, de); 1233 1234 /* No vnode should be allocated for this entry from this point */ 1235 TMPFS_NODE_LOCK(node); 1236 TMPFS_ASSERT_ELOCKED(node); 1237 TMPFS_NODE_LOCK(dnode); 1238 TMPFS_ASSERT_ELOCKED(dnode); 1239 1240 #if 0 1241 /* handled by tmpfs_free_node */ 1242 KKASSERT(node->tn_links > 0); 1243 node->tn_links--; 1244 node->tn_dir.tn_parent = NULL; 1245 #endif 1246 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1247 TMPFS_NODE_MODIFIED; 1248 1249 #if 0 1250 /* handled by tmpfs_free_node */ 1251 KKASSERT(dnode->tn_links > 0); 1252 dnode->tn_links--; 1253 #endif 1254 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1255 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1256 1257 TMPFS_NODE_UNLOCK(dnode); 1258 TMPFS_NODE_UNLOCK(node); 1259 1260 /* Free the directory entry we just deleted. Note that the node 1261 * referred by it will not be removed until the vnode is really 1262 * reclaimed. */ 1263 tmpfs_free_dirent(tmp, de); 1264 1265 /* Release the deleted vnode (will destroy the node, notify 1266 * interested parties and clean it from the cache). */ 1267 1268 TMPFS_NODE_LOCK(dnode); 1269 dnode->tn_status |= TMPFS_NODE_CHANGED; 1270 TMPFS_NODE_UNLOCK(dnode); 1271 tmpfs_update(dvp); 1272 1273 cache_setunresolved(v->a_nch); 1274 cache_setvp(v->a_nch, NULL); 1275 /*cache_inval_vp(vp, CINV_DESTROY);*/ 1276 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1277 error = 0; 1278 1279 out: 1280 vrele(vp); 1281 1282 return error; 1283 } 1284 1285 /* --------------------------------------------------------------------- */ 1286 1287 static int 1288 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1289 { 1290 struct vnode *dvp = v->a_dvp; 1291 struct vnode **vpp = v->a_vpp; 1292 struct namecache *ncp = v->a_nch->ncp; 1293 struct vattr *vap = v->a_vap; 1294 struct ucred *cred = v->a_cred; 1295 char *target = v->a_target; 1296 int error; 1297 1298 vap->va_type = VLNK; 1299 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1300 if (error == 0) { 1301 tmpfs_knote(*vpp, NOTE_WRITE); 1302 cache_setunresolved(v->a_nch); 1303 cache_setvp(v->a_nch, *vpp); 1304 } 1305 1306 return error; 1307 } 1308 1309 /* --------------------------------------------------------------------- */ 1310 1311 static int 1312 tmpfs_readdir(struct vop_readdir_args *v) 1313 { 1314 struct vnode *vp = v->a_vp; 1315 struct uio *uio = v->a_uio; 1316 int *eofflag = v->a_eofflag; 1317 off_t **cookies = v->a_cookies; 1318 int *ncookies = v->a_ncookies; 1319 struct tmpfs_mount *tmp; 1320 int error; 1321 off_t startoff; 1322 off_t cnt = 0; 1323 struct tmpfs_node *node; 1324 1325 /* This operation only makes sense on directory nodes. */ 1326 if (vp->v_type != VDIR) 1327 return ENOTDIR; 1328 1329 tmp = VFS_TO_TMPFS(vp->v_mount); 1330 node = VP_TO_TMPFS_DIR(vp); 1331 startoff = uio->uio_offset; 1332 1333 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1334 error = tmpfs_dir_getdotdent(node, uio); 1335 if (error != 0) 1336 goto outok; 1337 cnt++; 1338 } 1339 1340 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1341 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1342 if (error != 0) 1343 goto outok; 1344 cnt++; 1345 } 1346 1347 error = tmpfs_dir_getdents(node, uio, &cnt); 1348 1349 outok: 1350 KKASSERT(error >= -1); 1351 1352 if (error == -1) 1353 error = 0; 1354 1355 if (eofflag != NULL) 1356 *eofflag = 1357 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1358 1359 /* Update NFS-related variables. */ 1360 if (error == 0 && cookies != NULL && ncookies != NULL) { 1361 off_t i; 1362 off_t off = startoff; 1363 struct tmpfs_dirent *de = NULL; 1364 1365 *ncookies = cnt; 1366 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1367 1368 for (i = 0; i < cnt; i++) { 1369 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1370 if (off == TMPFS_DIRCOOKIE_DOT) { 1371 off = TMPFS_DIRCOOKIE_DOTDOT; 1372 } else { 1373 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1374 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1375 } else if (de != NULL) { 1376 de = TAILQ_NEXT(de, td_entries); 1377 } else { 1378 de = tmpfs_dir_lookupbycookie(node, 1379 off); 1380 KKASSERT(de != NULL); 1381 de = TAILQ_NEXT(de, td_entries); 1382 } 1383 if (de == NULL) 1384 off = TMPFS_DIRCOOKIE_EOF; 1385 else 1386 off = tmpfs_dircookie(de); 1387 } 1388 1389 (*cookies)[i] = off; 1390 } 1391 KKASSERT(uio->uio_offset == off); 1392 } 1393 1394 return error; 1395 } 1396 1397 /* --------------------------------------------------------------------- */ 1398 1399 static int 1400 tmpfs_readlink(struct vop_readlink_args *v) 1401 { 1402 struct vnode *vp = v->a_vp; 1403 struct uio *uio = v->a_uio; 1404 1405 int error; 1406 struct tmpfs_node *node; 1407 1408 KKASSERT(uio->uio_offset == 0); 1409 KKASSERT(vp->v_type == VLNK); 1410 1411 node = VP_TO_TMPFS_NODE(vp); 1412 1413 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1414 uio); 1415 TMPFS_NODE_LOCK(node); 1416 node->tn_status |= TMPFS_NODE_ACCESSED; 1417 TMPFS_NODE_UNLOCK(node); 1418 1419 return error; 1420 } 1421 1422 /* --------------------------------------------------------------------- */ 1423 1424 static int 1425 tmpfs_inactive(struct vop_inactive_args *v) 1426 { 1427 struct vnode *vp = v->a_vp; 1428 struct tmpfs_node *node; 1429 1430 node = VP_TO_TMPFS_NODE(vp); 1431 1432 /* 1433 * Degenerate case 1434 */ 1435 if (node == NULL) { 1436 vrecycle(vp); 1437 return(0); 1438 } 1439 1440 /* 1441 * Get rid of unreferenced deleted vnodes sooner rather than 1442 * later so the data memory can be recovered immediately. 1443 * 1444 * We must truncate the vnode to prevent the normal reclamation 1445 * path from flushing the data for the removed file to disk. 1446 */ 1447 TMPFS_NODE_LOCK(node); 1448 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1449 (node->tn_links == 0 || 1450 (node->tn_links == 1 && node->tn_type == VDIR && 1451 node->tn_dir.tn_parent))) 1452 { 1453 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1454 TMPFS_NODE_UNLOCK(node); 1455 if (node->tn_type == VREG) 1456 tmpfs_truncate(vp, 0); 1457 vrecycle(vp); 1458 } else { 1459 TMPFS_NODE_UNLOCK(node); 1460 } 1461 1462 return 0; 1463 } 1464 1465 /* --------------------------------------------------------------------- */ 1466 1467 int 1468 tmpfs_reclaim(struct vop_reclaim_args *v) 1469 { 1470 struct vnode *vp = v->a_vp; 1471 struct tmpfs_mount *tmp; 1472 struct tmpfs_node *node; 1473 1474 node = VP_TO_TMPFS_NODE(vp); 1475 tmp = VFS_TO_TMPFS(vp->v_mount); 1476 1477 tmpfs_free_vp(vp); 1478 1479 /* 1480 * If the node referenced by this vnode was deleted by the 1481 * user, we must free its associated data structures now that 1482 * the vnode is being reclaimed. 1483 * 1484 * Directories have an extra link ref. 1485 */ 1486 TMPFS_NODE_LOCK(node); 1487 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1488 (node->tn_links == 0 || 1489 (node->tn_links == 1 && node->tn_type == VDIR && 1490 node->tn_dir.tn_parent))) 1491 { 1492 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1493 tmpfs_free_node(tmp, node); 1494 /* eats the lock */ 1495 } else { 1496 TMPFS_NODE_UNLOCK(node); 1497 } 1498 1499 KKASSERT(vp->v_data == NULL); 1500 return 0; 1501 } 1502 1503 /* --------------------------------------------------------------------- */ 1504 1505 static int 1506 tmpfs_mountctl(struct vop_mountctl_args *ap) 1507 { 1508 struct tmpfs_mount *tmp; 1509 struct mount *mp; 1510 int rc; 1511 1512 switch (ap->a_op) { 1513 case (MOUNTCTL_SET_EXPORT): 1514 mp = ap->a_head.a_ops->head.vv_mount; 1515 tmp = (struct tmpfs_mount *) mp->mnt_data; 1516 1517 if (ap->a_ctllen != sizeof(struct export_args)) 1518 rc = (EINVAL); 1519 else 1520 rc = vfs_export(mp, &tmp->tm_export, 1521 (const struct export_args *) ap->a_ctl); 1522 break; 1523 default: 1524 rc = vop_stdmountctl(ap); 1525 break; 1526 } 1527 return (rc); 1528 } 1529 1530 /* --------------------------------------------------------------------- */ 1531 1532 static int 1533 tmpfs_print(struct vop_print_args *v) 1534 { 1535 struct vnode *vp = v->a_vp; 1536 1537 struct tmpfs_node *node; 1538 1539 node = VP_TO_TMPFS_NODE(vp); 1540 1541 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1542 node, node->tn_flags, node->tn_links); 1543 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1544 node->tn_mode, node->tn_uid, node->tn_gid, 1545 (uintmax_t)node->tn_size, node->tn_status); 1546 1547 if (vp->v_type == VFIFO) 1548 fifo_printinfo(vp); 1549 1550 kprintf("\n"); 1551 1552 return 0; 1553 } 1554 1555 /* --------------------------------------------------------------------- */ 1556 1557 static int 1558 tmpfs_pathconf(struct vop_pathconf_args *v) 1559 { 1560 int name = v->a_name; 1561 register_t *retval = v->a_retval; 1562 1563 int error; 1564 1565 error = 0; 1566 1567 switch (name) { 1568 case _PC_LINK_MAX: 1569 *retval = LINK_MAX; 1570 break; 1571 1572 case _PC_NAME_MAX: 1573 *retval = NAME_MAX; 1574 break; 1575 1576 case _PC_PATH_MAX: 1577 *retval = PATH_MAX; 1578 break; 1579 1580 case _PC_PIPE_BUF: 1581 *retval = PIPE_BUF; 1582 break; 1583 1584 case _PC_CHOWN_RESTRICTED: 1585 *retval = 1; 1586 break; 1587 1588 case _PC_NO_TRUNC: 1589 *retval = 1; 1590 break; 1591 1592 case _PC_SYNC_IO: 1593 *retval = 1; 1594 break; 1595 1596 case _PC_FILESIZEBITS: 1597 *retval = 0; /* XXX Don't know which value should I return. */ 1598 break; 1599 1600 default: 1601 error = EINVAL; 1602 } 1603 1604 return error; 1605 } 1606 1607 /************************************************************************ 1608 * KQFILTER OPS * 1609 ************************************************************************/ 1610 1611 static void filt_tmpfsdetach(struct knote *kn); 1612 static int filt_tmpfsread(struct knote *kn, long hint); 1613 static int filt_tmpfswrite(struct knote *kn, long hint); 1614 static int filt_tmpfsvnode(struct knote *kn, long hint); 1615 1616 static struct filterops tmpfsread_filtops = 1617 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1618 static struct filterops tmpfswrite_filtops = 1619 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1620 static struct filterops tmpfsvnode_filtops = 1621 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1622 1623 static int 1624 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1625 { 1626 struct vnode *vp = ap->a_vp; 1627 struct knote *kn = ap->a_kn; 1628 1629 switch (kn->kn_filter) { 1630 case EVFILT_READ: 1631 kn->kn_fop = &tmpfsread_filtops; 1632 break; 1633 case EVFILT_WRITE: 1634 kn->kn_fop = &tmpfswrite_filtops; 1635 break; 1636 case EVFILT_VNODE: 1637 kn->kn_fop = &tmpfsvnode_filtops; 1638 break; 1639 default: 1640 return (EOPNOTSUPP); 1641 } 1642 1643 kn->kn_hook = (caddr_t)vp; 1644 1645 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1646 1647 return(0); 1648 } 1649 1650 static void 1651 filt_tmpfsdetach(struct knote *kn) 1652 { 1653 struct vnode *vp = (void *)kn->kn_hook; 1654 1655 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1656 } 1657 1658 static int 1659 filt_tmpfsread(struct knote *kn, long hint) 1660 { 1661 struct vnode *vp = (void *)kn->kn_hook; 1662 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1663 off_t off; 1664 1665 if (hint == NOTE_REVOKE) { 1666 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1667 return(1); 1668 } 1669 1670 /* 1671 * Interlock against MP races when performing this function. 1672 */ 1673 lwkt_gettoken(&vp->v_mount->mnt_token); 1674 off = node->tn_size - kn->kn_fp->f_offset; 1675 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1676 if (kn->kn_sfflags & NOTE_OLDAPI) { 1677 lwkt_reltoken(&vp->v_mount->mnt_token); 1678 return(1); 1679 } 1680 1681 if (kn->kn_data == 0) { 1682 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1683 } 1684 lwkt_reltoken(&vp->v_mount->mnt_token); 1685 return (kn->kn_data != 0); 1686 } 1687 1688 static int 1689 filt_tmpfswrite(struct knote *kn, long hint) 1690 { 1691 if (hint == NOTE_REVOKE) 1692 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1693 kn->kn_data = 0; 1694 return (1); 1695 } 1696 1697 static int 1698 filt_tmpfsvnode(struct knote *kn, long hint) 1699 { 1700 if (kn->kn_sfflags & hint) 1701 kn->kn_fflags |= hint; 1702 if (hint == NOTE_REVOKE) { 1703 kn->kn_flags |= (EV_EOF | EV_NODATA); 1704 return (1); 1705 } 1706 return (kn->kn_fflags != 0); 1707 } 1708 1709 1710 /* --------------------------------------------------------------------- */ 1711 1712 /* 1713 * vnode operations vector used for files stored in a tmpfs file system. 1714 */ 1715 struct vop_ops tmpfs_vnode_vops = { 1716 .vop_default = vop_defaultop, 1717 .vop_getpages = vop_stdgetpages, 1718 .vop_putpages = vop_stdputpages, 1719 .vop_ncreate = tmpfs_ncreate, 1720 .vop_nresolve = tmpfs_nresolve, 1721 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1722 .vop_nmknod = tmpfs_nmknod, 1723 .vop_open = tmpfs_open, 1724 .vop_close = tmpfs_close, 1725 .vop_access = tmpfs_access, 1726 .vop_getattr = tmpfs_getattr, 1727 .vop_setattr = tmpfs_setattr, 1728 .vop_read = tmpfs_read, 1729 .vop_write = tmpfs_write, 1730 .vop_fsync = tmpfs_fsync, 1731 .vop_mountctl = tmpfs_mountctl, 1732 .vop_nremove = tmpfs_nremove, 1733 .vop_nlink = tmpfs_nlink, 1734 .vop_nrename = tmpfs_nrename, 1735 .vop_nmkdir = tmpfs_nmkdir, 1736 .vop_nrmdir = tmpfs_nrmdir, 1737 .vop_nsymlink = tmpfs_nsymlink, 1738 .vop_readdir = tmpfs_readdir, 1739 .vop_readlink = tmpfs_readlink, 1740 .vop_inactive = tmpfs_inactive, 1741 .vop_reclaim = tmpfs_reclaim, 1742 .vop_print = tmpfs_print, 1743 .vop_pathconf = tmpfs_pathconf, 1744 .vop_bmap = tmpfs_bmap, 1745 .vop_strategy = tmpfs_strategy, 1746 .vop_advlock = tmpfs_advlock, 1747 .vop_kqfilter = tmpfs_kqfilter 1748 }; 1749