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