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 #if 0 64 #include <vfs/tmpfs/tmpfs.h> 65 #endif 66 #include "tmpfs.h" 67 68 static void tmpfs_strategy_done(struct bio *bio); 69 70 static __inline 71 void 72 tmpfs_knote(struct vnode *vp, int flags) 73 { 74 if (flags) 75 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 76 } 77 78 79 /* --------------------------------------------------------------------- */ 80 81 static int 82 tmpfs_nresolve(struct vop_nresolve_args *v) 83 { 84 struct vnode *dvp = v->a_dvp; 85 struct vnode *vp = NULL; 86 struct namecache *ncp = v->a_nch->ncp; 87 struct tmpfs_node *tnode; 88 struct mount *mp; 89 90 int error; 91 struct tmpfs_dirent *de; 92 struct tmpfs_node *dnode; 93 94 mp = dvp->v_mount; 95 lwkt_gettoken(&mp->mnt_token); 96 97 dnode = VP_TO_TMPFS_DIR(dvp); 98 99 de = tmpfs_dir_lookup(dnode, NULL, ncp); 100 if (de == NULL) { 101 error = ENOENT; 102 } else { 103 /* 104 * Allocate a vnode for the node we found. 105 */ 106 tnode = de->td_node; 107 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 108 LK_EXCLUSIVE | LK_RETRY, &vp); 109 if (error) 110 goto out; 111 KKASSERT(vp); 112 } 113 114 out: 115 /* 116 * Store the result of this lookup in the cache. Avoid this if the 117 * request was for creation, as it does not improve timings on 118 * emprical tests. 119 */ 120 if (vp) { 121 vn_unlock(vp); 122 cache_setvp(v->a_nch, vp); 123 vrele(vp); 124 } else if (error == ENOENT) { 125 cache_setvp(v->a_nch, NULL); 126 } 127 128 lwkt_reltoken(&mp->mnt_token); 129 return (error); 130 } 131 132 static int 133 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v) 134 { 135 struct vnode *dvp = v->a_dvp; 136 struct vnode **vpp = v->a_vpp; 137 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp); 138 struct ucred *cred = v->a_cred; 139 struct mount *mp; 140 int error; 141 142 *vpp = NULL; 143 144 mp = dvp->v_mount; 145 lwkt_gettoken(&mp->mnt_token); 146 147 /* Check accessibility of requested node as a first step. */ 148 error = VOP_ACCESS(dvp, VEXEC, cred); 149 if (error != 0) { 150 lwkt_reltoken(&mp->mnt_token); 151 return error; 152 } 153 154 if (dnode->tn_dir.tn_parent != NULL) { 155 /* Allocate a new vnode on the matching entry. */ 156 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 157 LK_EXCLUSIVE | LK_RETRY, vpp); 158 159 if (*vpp) 160 vn_unlock(*vpp); 161 } 162 163 lwkt_reltoken(&mp->mnt_token); 164 165 return (*vpp == NULL) ? ENOENT : 0; 166 } 167 168 /* --------------------------------------------------------------------- */ 169 170 static int 171 tmpfs_ncreate(struct vop_ncreate_args *v) 172 { 173 struct vnode *dvp = v->a_dvp; 174 struct vnode **vpp = v->a_vpp; 175 struct namecache *ncp = v->a_nch->ncp; 176 struct vattr *vap = v->a_vap; 177 struct ucred *cred = v->a_cred; 178 struct mount *mp; 179 int error; 180 181 mp = dvp->v_mount; 182 lwkt_gettoken(&mp->mnt_token); 183 184 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 185 186 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 187 if (error == 0) { 188 cache_setunresolved(v->a_nch); 189 cache_setvp(v->a_nch, *vpp); 190 tmpfs_knote(dvp, NOTE_WRITE); 191 } 192 193 lwkt_reltoken(&mp->mnt_token); 194 195 return (error); 196 } 197 /* --------------------------------------------------------------------- */ 198 199 static int 200 tmpfs_nmknod(struct vop_nmknod_args *v) 201 { 202 struct vnode *dvp = v->a_dvp; 203 struct vnode **vpp = v->a_vpp; 204 struct namecache *ncp = v->a_nch->ncp; 205 struct vattr *vap = v->a_vap; 206 struct ucred *cred = v->a_cred; 207 struct mount *mp = dvp->v_mount; 208 int error; 209 210 lwkt_gettoken(&mp->mnt_token); 211 212 if (vap->va_type != VBLK && vap->va_type != VCHR && 213 vap->va_type != VFIFO) { 214 lwkt_reltoken(&mp->mnt_token); 215 return (EINVAL); 216 } 217 218 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 219 if (error == 0) { 220 cache_setunresolved(v->a_nch); 221 cache_setvp(v->a_nch, *vpp); 222 tmpfs_knote(dvp, NOTE_WRITE); 223 } 224 225 lwkt_reltoken(&mp->mnt_token); 226 227 return error; 228 } 229 230 /* --------------------------------------------------------------------- */ 231 232 static int 233 tmpfs_open(struct vop_open_args *v) 234 { 235 struct vnode *vp = v->a_vp; 236 int mode = v->a_mode; 237 struct mount *mp = vp->v_mount; 238 struct tmpfs_node *node; 239 int error; 240 241 lwkt_gettoken(&mp->mnt_token); 242 node = VP_TO_TMPFS_NODE(vp); 243 244 #if 0 245 /* The file is still active but all its names have been removed 246 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 247 * it is about to die. */ 248 if (node->tn_links < 1) 249 return (ENOENT); 250 #endif 251 252 /* If the file is marked append-only, deny write requests. */ 253 if ((node->tn_flags & APPEND) && 254 (mode & (FWRITE | O_APPEND)) == FWRITE) { 255 error = EPERM; 256 } else { 257 error = (vop_stdopen(v)); 258 } 259 260 lwkt_reltoken(&mp->mnt_token); 261 return (error); 262 } 263 264 /* --------------------------------------------------------------------- */ 265 266 static int 267 tmpfs_close(struct vop_close_args *v) 268 { 269 struct vnode *vp = v->a_vp; 270 struct tmpfs_node *node; 271 int error; 272 273 lwkt_gettoken(&vp->v_mount->mnt_token); 274 node = VP_TO_TMPFS_NODE(vp); 275 276 if (node->tn_links > 0) { 277 /* 278 * Update node times. No need to do it if the node has 279 * been deleted, because it will vanish after we return. 280 */ 281 tmpfs_update(vp); 282 } 283 284 error = vop_stdclose(v); 285 286 lwkt_reltoken(&vp->v_mount->mnt_token); 287 288 return (error); 289 } 290 291 /* --------------------------------------------------------------------- */ 292 293 int 294 tmpfs_access(struct vop_access_args *v) 295 { 296 struct vnode *vp = v->a_vp; 297 int error; 298 struct tmpfs_node *node; 299 300 lwkt_gettoken(&vp->v_mount->mnt_token); 301 node = VP_TO_TMPFS_NODE(vp); 302 303 switch (vp->v_type) { 304 case VDIR: 305 /* FALLTHROUGH */ 306 case VLNK: 307 /* FALLTHROUGH */ 308 case VREG: 309 if ((v->a_mode & VWRITE) && 310 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vop_helper_access(v, node->tn_uid, node->tn_gid, 336 node->tn_mode, 0); 337 338 out: 339 lwkt_reltoken(&vp->v_mount->mnt_token); 340 return error; 341 } 342 343 /* --------------------------------------------------------------------- */ 344 345 int 346 tmpfs_getattr(struct vop_getattr_args *v) 347 { 348 struct vnode *vp = v->a_vp; 349 struct vattr *vap = v->a_vap; 350 struct tmpfs_node *node; 351 352 lwkt_gettoken(&vp->v_mount->mnt_token); 353 node = VP_TO_TMPFS_NODE(vp); 354 355 tmpfs_update(vp); 356 357 vap->va_type = vp->v_type; 358 vap->va_mode = node->tn_mode; 359 vap->va_nlink = node->tn_links; 360 vap->va_uid = node->tn_uid; 361 vap->va_gid = node->tn_gid; 362 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 363 vap->va_fileid = node->tn_id; 364 vap->va_size = node->tn_size; 365 vap->va_blocksize = PAGE_SIZE; 366 vap->va_atime.tv_sec = node->tn_atime; 367 vap->va_atime.tv_nsec = node->tn_atimensec; 368 vap->va_mtime.tv_sec = node->tn_mtime; 369 vap->va_mtime.tv_nsec = node->tn_mtimensec; 370 vap->va_ctime.tv_sec = node->tn_ctime; 371 vap->va_ctime.tv_nsec = node->tn_ctimensec; 372 vap->va_gen = node->tn_gen; 373 vap->va_flags = node->tn_flags; 374 if (vp->v_type == VBLK || vp->v_type == VCHR) 375 { 376 vap->va_rmajor = umajor(node->tn_rdev); 377 vap->va_rminor = uminor(node->tn_rdev); 378 } 379 vap->va_bytes = round_page(node->tn_size); 380 vap->va_filerev = 0; 381 382 lwkt_reltoken(&vp->v_mount->mnt_token); 383 384 return 0; 385 } 386 387 /* --------------------------------------------------------------------- */ 388 389 int 390 tmpfs_setattr(struct vop_setattr_args *v) 391 { 392 struct vnode *vp = v->a_vp; 393 struct vattr *vap = v->a_vap; 394 struct ucred *cred = v->a_cred; 395 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 396 int error = 0; 397 int kflags = 0; 398 399 lwkt_gettoken(&vp->v_mount->mnt_token); 400 if (error == 0 && (vap->va_flags != VNOVAL)) { 401 error = tmpfs_chflags(vp, vap->va_flags, cred); 402 kflags |= NOTE_ATTRIB; 403 } 404 405 if (error == 0 && (vap->va_size != VNOVAL)) { 406 if (vap->va_size > node->tn_size) 407 kflags |= NOTE_WRITE | NOTE_EXTEND; 408 else 409 kflags |= NOTE_WRITE; 410 error = tmpfs_chsize(vp, vap->va_size, cred); 411 } 412 413 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL || 414 vap->va_gid != (gid_t)VNOVAL)) { 415 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred); 416 kflags |= NOTE_ATTRIB; 417 } 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) { 420 error = tmpfs_chmod(vp, vap->va_mode, cred); 421 kflags |= NOTE_ATTRIB; 422 } 423 424 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 425 vap->va_atime.tv_nsec != VNOVAL) || 426 (vap->va_mtime.tv_sec != VNOVAL && 427 vap->va_mtime.tv_nsec != VNOVAL) )) { 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 vap->va_vaflags, cred); 430 kflags |= NOTE_ATTRIB; 431 } 432 433 /* Update the node times. We give preference to the error codes 434 * generated by this function rather than the ones that may arise 435 * from tmpfs_update. */ 436 tmpfs_update(vp); 437 tmpfs_knote(vp, kflags); 438 439 lwkt_reltoken(&vp->v_mount->mnt_token); 440 441 return (error); 442 } 443 444 /* --------------------------------------------------------------------- */ 445 446 /* 447 * fsync is usually a NOP, but we must take action when unmounting or 448 * when recycling. 449 */ 450 static int 451 tmpfs_fsync(struct vop_fsync_args *v) 452 { 453 struct tmpfs_node *node; 454 struct vnode *vp = v->a_vp; 455 456 lwkt_gettoken(&vp->v_mount->mnt_token); 457 node = VP_TO_TMPFS_NODE(vp); 458 459 tmpfs_update(vp); 460 if (vp->v_type == VREG) { 461 if (vp->v_flag & VRECLAIMED) { 462 if (node->tn_links == 0) 463 tmpfs_truncate(vp, 0); 464 else 465 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL); 466 } 467 } 468 469 lwkt_reltoken(&vp->v_mount->mnt_token); 470 return 0; 471 } 472 473 /* --------------------------------------------------------------------- */ 474 475 static int 476 tmpfs_read (struct vop_read_args *ap) 477 { 478 struct buf *bp; 479 struct vnode *vp = ap->a_vp; 480 struct uio *uio = ap->a_uio; 481 struct tmpfs_node *node; 482 off_t base_offset; 483 size_t offset; 484 size_t len; 485 size_t resid; 486 int error; 487 488 /* 489 * Check the basics 490 */ 491 if (uio->uio_offset < 0) 492 return (EINVAL); 493 if (vp->v_type != VREG) 494 return (EINVAL); 495 496 /* 497 * Extract node, try to shortcut the operation through 498 * the VM page cache, allowing us to avoid buffer cache 499 * overheads. 500 */ 501 node = VP_TO_TMPFS_NODE(vp); 502 resid = uio->uio_resid; 503 error = vop_helper_read_shortcut(ap); 504 if (error) 505 return error; 506 if (uio->uio_resid == 0) { 507 if (resid) 508 goto finished; 509 return error; 510 } 511 512 /* 513 * Fall-through to our normal read code. 514 */ 515 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) { 516 /* 517 * Use buffer cache I/O (via tmpfs_strategy) 518 */ 519 offset = (size_t)uio->uio_offset & BMASK; 520 base_offset = (off_t)uio->uio_offset - offset; 521 bp = getcacheblk(vp, base_offset, BSIZE, 0); 522 if (bp == NULL) { 523 lwkt_gettoken(&vp->v_mount->mnt_token); 524 error = bread(vp, base_offset, BSIZE, &bp); 525 if (error) { 526 brelse(bp); 527 lwkt_reltoken(&vp->v_mount->mnt_token); 528 kprintf("tmpfs_read bread error %d\n", error); 529 break; 530 } 531 lwkt_reltoken(&vp->v_mount->mnt_token); 532 } 533 534 /* 535 * Figure out how many bytes we can actually copy this loop. 536 */ 537 len = BSIZE - offset; 538 if (len > uio->uio_resid) 539 len = uio->uio_resid; 540 if (len > node->tn_size - uio->uio_offset) 541 len = (size_t)(node->tn_size - uio->uio_offset); 542 543 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 544 bqrelse(bp); 545 if (error) { 546 kprintf("tmpfs_read uiomove error %d\n", error); 547 break; 548 } 549 } 550 551 finished: 552 TMPFS_NODE_LOCK(node); 553 node->tn_status |= TMPFS_NODE_ACCESSED; 554 TMPFS_NODE_UNLOCK(node); 555 556 return (error); 557 } 558 559 static int 560 tmpfs_write (struct vop_write_args *ap) 561 { 562 struct buf *bp; 563 struct vnode *vp = ap->a_vp; 564 struct uio *uio = ap->a_uio; 565 struct thread *td = uio->uio_td; 566 struct tmpfs_node *node; 567 boolean_t extended; 568 off_t oldsize; 569 int error; 570 off_t base_offset; 571 size_t offset; 572 size_t len; 573 struct rlimit limit; 574 int trivial = 0; 575 int kflags = 0; 576 577 error = 0; 578 if (uio->uio_resid == 0) { 579 return error; 580 } 581 582 node = VP_TO_TMPFS_NODE(vp); 583 584 if (vp->v_type != VREG) 585 return (EINVAL); 586 587 lwkt_gettoken(&vp->v_mount->mnt_token); 588 589 oldsize = node->tn_size; 590 if (ap->a_ioflag & IO_APPEND) 591 uio->uio_offset = node->tn_size; 592 593 /* 594 * Check for illegal write offsets. 595 */ 596 if (uio->uio_offset + uio->uio_resid > 597 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) { 598 lwkt_reltoken(&vp->v_mount->mnt_token); 599 return (EFBIG); 600 } 601 602 /* 603 * NOTE: Ignore if UIO does not come from a user thread (e.g. VN). 604 */ 605 if (vp->v_type == VREG && td != NULL && td->td_lwp != NULL) { 606 error = kern_getrlimit(RLIMIT_FSIZE, &limit); 607 if (error != 0) { 608 lwkt_reltoken(&vp->v_mount->mnt_token); 609 return error; 610 } 611 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) { 612 ksignal(td->td_proc, SIGXFSZ); 613 lwkt_reltoken(&vp->v_mount->mnt_token); 614 return (EFBIG); 615 } 616 } 617 618 619 /* 620 * Extend the file's size if necessary 621 */ 622 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size); 623 624 while (uio->uio_resid > 0) { 625 /* 626 * Use buffer cache I/O (via tmpfs_strategy) 627 */ 628 offset = (size_t)uio->uio_offset & BMASK; 629 base_offset = (off_t)uio->uio_offset - offset; 630 len = BSIZE - offset; 631 if (len > uio->uio_resid) 632 len = uio->uio_resid; 633 634 if ((uio->uio_offset + len) > node->tn_size) { 635 trivial = (uio->uio_offset <= node->tn_size); 636 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial); 637 if (error) 638 break; 639 } 640 641 /* 642 * Read to fill in any gaps. Theoretically we could 643 * optimize this if the write covers the entire buffer 644 * and is not a UIO_NOCOPY write, however this can lead 645 * to a security violation exposing random kernel memory 646 * (whatever junk was in the backing VM pages before). 647 * 648 * So just use bread() to do the right thing. 649 */ 650 error = bread(vp, base_offset, BSIZE, &bp); 651 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio); 652 if (error) { 653 kprintf("tmpfs_write uiomove error %d\n", error); 654 brelse(bp); 655 break; 656 } 657 658 if (uio->uio_offset > node->tn_size) { 659 node->tn_size = uio->uio_offset; 660 kflags |= NOTE_EXTEND; 661 } 662 kflags |= NOTE_WRITE; 663 664 /* 665 * Always try to flush the page in the UIO_NOCOPY case. This 666 * can come from the pageout daemon or during vnode eviction. 667 * It is not necessarily going to be marked IO_ASYNC/IO_SYNC. 668 * 669 * For the normal case we buwrite(), dirtying the underlying 670 * VM pages instead of dirtying the buffer and releasing the 671 * buffer as a clean buffer. This allows tmpfs to use 672 * essentially all available memory to cache file data. 673 * If we used bdwrite() the buffer cache would wind up 674 * flushing the data to swap too quickly. 675 */ 676 bp->b_flags |= B_AGE; 677 if (uio->uio_segflg == UIO_NOCOPY) { 678 bawrite(bp); 679 } else { 680 buwrite(bp); 681 } 682 683 if (bp->b_error) { 684 kprintf("tmpfs_write bwrite error %d\n", bp->b_error); 685 break; 686 } 687 } 688 689 if (error) { 690 if (extended) { 691 (void)tmpfs_reg_resize(vp, oldsize, trivial); 692 kflags &= ~NOTE_EXTEND; 693 } 694 goto done; 695 } 696 697 /* 698 * Currently we don't set the mtime on files modified via mmap() 699 * because we can't tell the difference between those modifications 700 * and an attempt by the pageout daemon to flush tmpfs pages to 701 * swap. 702 * 703 * This is because in order to defer flushes as long as possible 704 * buwrite() works by marking the underlying VM pages dirty in 705 * order to be able to dispose of the buffer cache buffer without 706 * flushing it. 707 */ 708 TMPFS_NODE_LOCK(node); 709 if (uio->uio_segflg != UIO_NOCOPY) 710 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED; 711 if (extended) 712 node->tn_status |= TMPFS_NODE_CHANGED; 713 714 if (node->tn_mode & (S_ISUID | S_ISGID)) { 715 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) 716 node->tn_mode &= ~(S_ISUID | S_ISGID); 717 } 718 TMPFS_NODE_UNLOCK(node); 719 done: 720 721 tmpfs_knote(vp, kflags); 722 723 lwkt_reltoken(&vp->v_mount->mnt_token); 724 return(error); 725 } 726 727 static int 728 tmpfs_advlock (struct vop_advlock_args *ap) 729 { 730 struct tmpfs_node *node; 731 struct vnode *vp = ap->a_vp; 732 int error; 733 734 lwkt_gettoken(&vp->v_mount->mnt_token); 735 node = VP_TO_TMPFS_NODE(vp); 736 737 error = (lf_advlock(ap, &node->tn_advlock, node->tn_size)); 738 lwkt_reltoken(&vp->v_mount->mnt_token); 739 740 return (error); 741 } 742 743 /* 744 * The strategy function is typically only called when memory pressure 745 * forces the system to attempt to pageout pages. It can also be called 746 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write 747 * operations 748 */ 749 static int 750 tmpfs_strategy(struct vop_strategy_args *ap) 751 { 752 struct bio *bio = ap->a_bio; 753 struct bio *nbio; 754 struct buf *bp = bio->bio_buf; 755 struct vnode *vp = ap->a_vp; 756 struct tmpfs_node *node; 757 vm_object_t uobj; 758 vm_page_t m; 759 int i; 760 761 if (vp->v_type != VREG) { 762 bp->b_resid = bp->b_bcount; 763 bp->b_flags |= B_ERROR | B_INVAL; 764 bp->b_error = EINVAL; 765 biodone(bio); 766 return(0); 767 } 768 769 lwkt_gettoken(&vp->v_mount->mnt_token); 770 node = VP_TO_TMPFS_NODE(vp); 771 772 uobj = node->tn_reg.tn_aobj; 773 774 /* 775 * Don't bother flushing to swap if there is no swap, just 776 * ensure that the pages are marked as needing a commit (still). 777 */ 778 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) { 779 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 780 m = bp->b_xio.xio_pages[i]; 781 vm_page_need_commit(m); 782 } 783 bp->b_resid = 0; 784 bp->b_error = 0; 785 biodone(bio); 786 } else { 787 nbio = push_bio(bio); 788 nbio->bio_done = tmpfs_strategy_done; 789 nbio->bio_offset = bio->bio_offset; 790 swap_pager_strategy(uobj, nbio); 791 } 792 793 lwkt_reltoken(&vp->v_mount->mnt_token); 794 return 0; 795 } 796 797 /* 798 * If we were unable to commit the pages to swap make sure they are marked 799 * as needing a commit (again). If we were, clear the flag to allow the 800 * pages to be freed. 801 */ 802 static void 803 tmpfs_strategy_done(struct bio *bio) 804 { 805 struct buf *bp; 806 vm_page_t m; 807 int i; 808 809 bp = bio->bio_buf; 810 811 if (bp->b_flags & B_ERROR) { 812 bp->b_flags &= ~B_ERROR; 813 bp->b_error = 0; 814 bp->b_resid = 0; 815 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 816 m = bp->b_xio.xio_pages[i]; 817 vm_page_need_commit(m); 818 } 819 } else { 820 for (i = 0; i < bp->b_xio.xio_npages; ++i) { 821 m = bp->b_xio.xio_pages[i]; 822 vm_page_clear_commit(m); 823 } 824 } 825 bio = pop_bio(bio); 826 biodone(bio); 827 } 828 829 static int 830 tmpfs_bmap(struct vop_bmap_args *ap) 831 { 832 if (ap->a_doffsetp != NULL) 833 *ap->a_doffsetp = ap->a_loffset; 834 if (ap->a_runp != NULL) 835 *ap->a_runp = 0; 836 if (ap->a_runb != NULL) 837 *ap->a_runb = 0; 838 839 return 0; 840 } 841 842 /* --------------------------------------------------------------------- */ 843 844 static int 845 tmpfs_nremove(struct vop_nremove_args *v) 846 { 847 struct vnode *dvp = v->a_dvp; 848 struct namecache *ncp = v->a_nch->ncp; 849 struct vnode *vp; 850 int error; 851 struct tmpfs_dirent *de; 852 struct tmpfs_mount *tmp; 853 struct tmpfs_node *dnode; 854 struct tmpfs_node *node; 855 struct mount *mp; 856 857 mp = dvp->v_mount; 858 859 lwkt_gettoken(&mp->mnt_token); 860 861 /* 862 * We have to acquire the vp from v->a_nch because we will likely 863 * unresolve the namecache entry, and a vrele/vput is needed to 864 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 865 * 866 * We have to use vget to clear any inactive state on the vnode, 867 * otherwise the vnode may remain inactive and thus tmpfs_inactive 868 * will not get called when we release it. 869 */ 870 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 871 KKASSERT(vp->v_mount == dvp->v_mount); 872 KKASSERT(error == 0); 873 vn_unlock(vp); 874 875 if (vp->v_type == VDIR) { 876 error = EISDIR; 877 goto out; 878 } 879 880 dnode = VP_TO_TMPFS_DIR(dvp); 881 node = VP_TO_TMPFS_NODE(vp); 882 tmp = VFS_TO_TMPFS(vp->v_mount); 883 de = tmpfs_dir_lookup(dnode, node, ncp); 884 if (de == NULL) { 885 error = ENOENT; 886 goto out; 887 } 888 889 /* Files marked as immutable or append-only cannot be deleted. */ 890 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 891 (dnode->tn_flags & APPEND)) { 892 error = EPERM; 893 goto out; 894 } 895 896 /* Remove the entry from the directory; as it is a file, we do not 897 * have to change the number of hard links of the directory. */ 898 tmpfs_dir_detach(dnode, de); 899 900 /* Free the directory entry we just deleted. Note that the node 901 * referred by it will not be removed until the vnode is really 902 * reclaimed. */ 903 tmpfs_free_dirent(tmp, de); 904 905 if (node->tn_links > 0) { 906 TMPFS_NODE_LOCK(node); 907 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 908 TMPFS_NODE_MODIFIED; 909 TMPFS_NODE_UNLOCK(node); 910 } 911 912 cache_unlink(v->a_nch); 913 tmpfs_knote(vp, NOTE_DELETE); 914 tmpfs_knote(dvp, NOTE_WRITE); 915 error = 0; 916 917 out: 918 vrele(vp); 919 lwkt_reltoken(&mp->mnt_token); 920 921 return error; 922 } 923 924 /* --------------------------------------------------------------------- */ 925 926 static int 927 tmpfs_nlink(struct vop_nlink_args *v) 928 { 929 struct vnode *dvp = v->a_dvp; 930 struct vnode *vp = v->a_vp; 931 struct namecache *ncp = v->a_nch->ncp; 932 struct tmpfs_dirent *de; 933 struct tmpfs_node *node; 934 struct tmpfs_node *dnode; 935 struct mount *mp; 936 int error; 937 938 if (dvp->v_mount != vp->v_mount) 939 return(EXDEV); 940 mp = dvp->v_mount; 941 942 lwkt_gettoken(&mp->mnt_token); 943 KKASSERT(dvp != vp); /* XXX When can this be false? */ 944 945 node = VP_TO_TMPFS_NODE(vp); 946 dnode = VP_TO_TMPFS_NODE(dvp); 947 948 /* XXX: Why aren't the following two tests done by the caller? */ 949 950 /* Hard links of directories are forbidden. */ 951 if (vp->v_type == VDIR) { 952 error = EPERM; 953 goto out; 954 } 955 956 /* Cannot create cross-device links. */ 957 if (dvp->v_mount != vp->v_mount) { 958 error = EXDEV; 959 goto out; 960 } 961 962 /* Ensure that we do not overflow the maximum number of links imposed 963 * by the system. */ 964 KKASSERT(node->tn_links <= LINK_MAX); 965 if (node->tn_links == LINK_MAX) { 966 error = EMLINK; 967 goto out; 968 } 969 970 /* We cannot create links of files marked immutable or append-only. */ 971 if (node->tn_flags & (IMMUTABLE | APPEND)) { 972 error = EPERM; 973 goto out; 974 } 975 976 /* Allocate a new directory entry to represent the node. */ 977 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 978 ncp->nc_name, ncp->nc_nlen, &de); 979 if (error != 0) 980 goto out; 981 982 /* Insert the new directory entry into the appropriate directory. */ 983 tmpfs_dir_attach(dnode, de); 984 985 /* vp link count has changed, so update node times. */ 986 987 TMPFS_NODE_LOCK(node); 988 node->tn_status |= TMPFS_NODE_CHANGED; 989 TMPFS_NODE_UNLOCK(node); 990 tmpfs_update(vp); 991 992 tmpfs_knote(vp, NOTE_LINK); 993 cache_setunresolved(v->a_nch); 994 cache_setvp(v->a_nch, vp); 995 tmpfs_knote(dvp, NOTE_WRITE); 996 error = 0; 997 998 out: 999 lwkt_reltoken(&mp->mnt_token); 1000 return error; 1001 } 1002 1003 /* --------------------------------------------------------------------- */ 1004 1005 static int 1006 tmpfs_nrename(struct vop_nrename_args *v) 1007 { 1008 struct vnode *fdvp = v->a_fdvp; 1009 struct namecache *fncp = v->a_fnch->ncp; 1010 struct vnode *fvp = fncp->nc_vp; 1011 struct vnode *tdvp = v->a_tdvp; 1012 struct namecache *tncp = v->a_tnch->ncp; 1013 struct vnode *tvp; 1014 struct tmpfs_dirent *de, *tde; 1015 struct tmpfs_mount *tmp; 1016 struct tmpfs_node *fdnode; 1017 struct tmpfs_node *fnode; 1018 struct tmpfs_node *tnode; 1019 struct tmpfs_node *tdnode; 1020 struct mount *mp; 1021 char *newname; 1022 char *oldname; 1023 int error; 1024 1025 mp = fdvp->v_mount; 1026 KKASSERT(fdvp->v_mount == fvp->v_mount); 1027 1028 lwkt_gettoken(&mp->mnt_token); 1029 /* 1030 * Because tvp can get overwritten we have to vget it instead of 1031 * just vref or use it, otherwise it's VINACTIVE flag may not get 1032 * cleared and the node won't get destroyed. 1033 */ 1034 error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp); 1035 if (error == 0) { 1036 tnode = VP_TO_TMPFS_NODE(tvp); 1037 vn_unlock(tvp); 1038 } else { 1039 tnode = NULL; 1040 } 1041 1042 /* Disallow cross-device renames. 1043 * XXX Why isn't this done by the caller? */ 1044 if (fvp->v_mount != tdvp->v_mount || 1045 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1046 error = EXDEV; 1047 goto out; 1048 } 1049 1050 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1051 tdnode = VP_TO_TMPFS_DIR(tdvp); 1052 1053 /* If source and target are the same file, there is nothing to do. */ 1054 if (fvp == tvp) { 1055 error = 0; 1056 goto out; 1057 } 1058 1059 fdnode = VP_TO_TMPFS_DIR(fdvp); 1060 fnode = VP_TO_TMPFS_NODE(fvp); 1061 de = tmpfs_dir_lookup(fdnode, fnode, fncp); 1062 1063 /* Avoid manipulating '.' and '..' entries. */ 1064 if (de == NULL) { 1065 error = ENOENT; 1066 goto out_locked; 1067 } 1068 KKASSERT(de->td_node == fnode); 1069 1070 /* 1071 * If replacing an entry in the target directory and that entry 1072 * is a directory, it must be empty. 1073 * 1074 * Kern_rename gurantees the destination to be a directory 1075 * if the source is one (it does?). 1076 */ 1077 if (tvp != NULL) { 1078 KKASSERT(tnode != NULL); 1079 1080 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1081 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1082 error = EPERM; 1083 goto out_locked; 1084 } 1085 1086 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1087 if (tnode->tn_size > 0) { 1088 error = ENOTEMPTY; 1089 goto out_locked; 1090 } 1091 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1092 error = ENOTDIR; 1093 goto out_locked; 1094 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1095 error = EISDIR; 1096 goto out_locked; 1097 } else { 1098 KKASSERT(fnode->tn_type != VDIR && 1099 tnode->tn_type != VDIR); 1100 } 1101 } 1102 1103 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1104 (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1105 error = EPERM; 1106 goto out_locked; 1107 } 1108 1109 /* 1110 * Ensure that we have enough memory to hold the new name, if it 1111 * has to be changed. 1112 */ 1113 if (fncp->nc_nlen != tncp->nc_nlen || 1114 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { 1115 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, 1116 M_WAITOK | M_NULLOK); 1117 if (newname == NULL) { 1118 error = ENOSPC; 1119 goto out_locked; 1120 } 1121 bcopy(tncp->nc_name, newname, tncp->nc_nlen); 1122 newname[tncp->nc_nlen] = '\0'; 1123 } else { 1124 newname = NULL; 1125 } 1126 1127 /* 1128 * Unlink entry from source directory. Note that the kernel has 1129 * already checked for illegal recursion cases (renaming a directory 1130 * into a subdirectory of itself). 1131 */ 1132 if (fdnode != tdnode) { 1133 tmpfs_dir_detach(fdnode, de); 1134 } else { 1135 RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de); 1136 } 1137 1138 /* 1139 * Handle any name change. Swap with newname, we will 1140 * deallocate it at the end. 1141 */ 1142 if (newname != NULL) { 1143 #if 0 1144 TMPFS_NODE_LOCK(fnode); 1145 fnode->tn_status |= TMPFS_NODE_CHANGED; 1146 TMPFS_NODE_UNLOCK(fnode); 1147 #endif 1148 oldname = de->td_name; 1149 de->td_name = newname; 1150 de->td_namelen = (uint16_t)tncp->nc_nlen; 1151 newname = oldname; 1152 } 1153 1154 /* 1155 * If we are overwriting an entry, we have to remove the old one 1156 * from the target directory. 1157 */ 1158 if (tvp != NULL) { 1159 /* Remove the old entry from the target directory. */ 1160 tde = tmpfs_dir_lookup(tdnode, tnode, tncp); 1161 tmpfs_dir_detach(tdnode, tde); 1162 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); 1163 1164 /* 1165 * Free the directory entry we just deleted. Note that the 1166 * node referred by it will not be removed until the vnode is 1167 * really reclaimed. 1168 */ 1169 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1170 /*cache_inval_vp(tvp, CINV_DESTROY);*/ 1171 } 1172 1173 /* 1174 * Link entry to target directory. If the entry 1175 * represents a directory move the parent linkage 1176 * as well. 1177 */ 1178 if (fdnode != tdnode) { 1179 if (de->td_node->tn_type == VDIR) { 1180 TMPFS_VALIDATE_DIR(fnode); 1181 } 1182 tmpfs_dir_attach(tdnode, de); 1183 } else { 1184 TMPFS_NODE_LOCK(tdnode); 1185 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1186 RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de); 1187 TMPFS_NODE_UNLOCK(tdnode); 1188 } 1189 1190 /* 1191 * Finish up 1192 */ 1193 if (newname) { 1194 kfree(newname, tmp->tm_name_zone); 1195 newname = NULL; 1196 } 1197 cache_rename(v->a_fnch, v->a_tnch); 1198 tmpfs_knote(v->a_fdvp, NOTE_WRITE); 1199 tmpfs_knote(v->a_tdvp, NOTE_WRITE); 1200 if (fnode->tn_vnode) 1201 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); 1202 error = 0; 1203 1204 out_locked: 1205 ; 1206 1207 out: 1208 if (tvp) 1209 vrele(tvp); 1210 1211 lwkt_reltoken(&mp->mnt_token); 1212 1213 return error; 1214 } 1215 1216 /* --------------------------------------------------------------------- */ 1217 1218 static int 1219 tmpfs_nmkdir(struct vop_nmkdir_args *v) 1220 { 1221 struct vnode *dvp = v->a_dvp; 1222 struct vnode **vpp = v->a_vpp; 1223 struct namecache *ncp = v->a_nch->ncp; 1224 struct vattr *vap = v->a_vap; 1225 struct ucred *cred = v->a_cred; 1226 struct mount *mp; 1227 int error; 1228 1229 mp = dvp->v_mount; 1230 1231 lwkt_gettoken(&mp->mnt_token); 1232 KKASSERT(vap->va_type == VDIR); 1233 1234 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL); 1235 if (error == 0) { 1236 cache_setunresolved(v->a_nch); 1237 cache_setvp(v->a_nch, *vpp); 1238 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1239 } 1240 1241 lwkt_reltoken(&mp->mnt_token); 1242 1243 return error; 1244 } 1245 1246 /* --------------------------------------------------------------------- */ 1247 1248 static int 1249 tmpfs_nrmdir(struct vop_nrmdir_args *v) 1250 { 1251 struct vnode *dvp = v->a_dvp; 1252 struct namecache *ncp = v->a_nch->ncp; 1253 struct vnode *vp; 1254 struct tmpfs_dirent *de; 1255 struct tmpfs_mount *tmp; 1256 struct tmpfs_node *dnode; 1257 struct tmpfs_node *node; 1258 struct mount *mp; 1259 int error; 1260 1261 mp = dvp->v_mount; 1262 lwkt_gettoken(&mp->mnt_token); 1263 1264 /* 1265 * We have to acquire the vp from v->a_nch because we will likely 1266 * unresolve the namecache entry, and a vrele/vput is needed to 1267 * trigger the tmpfs_inactive/tmpfs_reclaim sequence. 1268 * 1269 * We have to use vget to clear any inactive state on the vnode, 1270 * otherwise the vnode may remain inactive and thus tmpfs_inactive 1271 * will not get called when we release it. 1272 */ 1273 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp); 1274 KKASSERT(error == 0); 1275 vn_unlock(vp); 1276 1277 /* 1278 * Prevalidate so we don't hit an assertion later 1279 */ 1280 if (vp->v_type != VDIR) { 1281 error = ENOTDIR; 1282 goto out; 1283 } 1284 1285 tmp = VFS_TO_TMPFS(dvp->v_mount); 1286 dnode = VP_TO_TMPFS_DIR(dvp); 1287 node = VP_TO_TMPFS_DIR(vp); 1288 1289 /* Directories with more than two entries ('.' and '..') cannot be 1290 * removed. */ 1291 if (node->tn_size > 0) { 1292 error = ENOTEMPTY; 1293 goto out; 1294 } 1295 1296 if ((dnode->tn_flags & APPEND) 1297 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1298 error = EPERM; 1299 goto out; 1300 } 1301 1302 /* This invariant holds only if we are not trying to remove "..". 1303 * We checked for that above so this is safe now. */ 1304 KKASSERT(node->tn_dir.tn_parent == dnode); 1305 1306 /* Get the directory entry associated with node (vp). This was 1307 * filled by tmpfs_lookup while looking up the entry. */ 1308 de = tmpfs_dir_lookup(dnode, node, ncp); 1309 KKASSERT(TMPFS_DIRENT_MATCHES(de, 1310 ncp->nc_name, 1311 ncp->nc_nlen)); 1312 1313 /* Check flags to see if we are allowed to remove the directory. */ 1314 if ((dnode->tn_flags & APPEND) || 1315 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1316 error = EPERM; 1317 goto out; 1318 } 1319 1320 1321 /* Detach the directory entry from the directory (dnode). */ 1322 tmpfs_dir_detach(dnode, de); 1323 1324 /* No vnode should be allocated for this entry from this point */ 1325 TMPFS_NODE_LOCK(node); 1326 TMPFS_ASSERT_ELOCKED(node); 1327 TMPFS_NODE_LOCK(dnode); 1328 TMPFS_ASSERT_ELOCKED(dnode); 1329 1330 /* 1331 * Must set parent linkage to NULL (tested by ncreate to disallow 1332 * the creation of new files/dirs in a deleted directory) 1333 */ 1334 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1335 TMPFS_NODE_MODIFIED; 1336 1337 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1338 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1339 1340 TMPFS_NODE_UNLOCK(dnode); 1341 TMPFS_NODE_UNLOCK(node); 1342 1343 /* Free the directory entry we just deleted. Note that the node 1344 * referred by it will not be removed until the vnode is really 1345 * reclaimed. */ 1346 tmpfs_free_dirent(tmp, de); 1347 1348 /* Release the deleted vnode (will destroy the node, notify 1349 * interested parties and clean it from the cache). */ 1350 1351 TMPFS_NODE_LOCK(dnode); 1352 dnode->tn_status |= TMPFS_NODE_CHANGED; 1353 TMPFS_NODE_UNLOCK(dnode); 1354 tmpfs_update(dvp); 1355 1356 cache_unlink(v->a_nch); 1357 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 1358 error = 0; 1359 1360 out: 1361 vrele(vp); 1362 1363 lwkt_reltoken(&mp->mnt_token); 1364 1365 return error; 1366 } 1367 1368 /* --------------------------------------------------------------------- */ 1369 1370 static int 1371 tmpfs_nsymlink(struct vop_nsymlink_args *v) 1372 { 1373 struct vnode *dvp = v->a_dvp; 1374 struct vnode **vpp = v->a_vpp; 1375 struct namecache *ncp = v->a_nch->ncp; 1376 struct vattr *vap = v->a_vap; 1377 struct ucred *cred = v->a_cred; 1378 char *target = v->a_target; 1379 struct mount *mp = dvp->v_mount; 1380 int error; 1381 1382 lwkt_gettoken(&mp->mnt_token); 1383 vap->va_type = VLNK; 1384 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target); 1385 if (error == 0) { 1386 tmpfs_knote(*vpp, NOTE_WRITE); 1387 cache_setunresolved(v->a_nch); 1388 cache_setvp(v->a_nch, *vpp); 1389 } 1390 1391 lwkt_reltoken(&mp->mnt_token); 1392 1393 return error; 1394 } 1395 1396 /* --------------------------------------------------------------------- */ 1397 1398 static int 1399 tmpfs_readdir(struct vop_readdir_args *v) 1400 { 1401 struct vnode *vp = v->a_vp; 1402 struct uio *uio = v->a_uio; 1403 int *eofflag = v->a_eofflag; 1404 off_t **cookies = v->a_cookies; 1405 int *ncookies = v->a_ncookies; 1406 struct tmpfs_mount *tmp; 1407 int error; 1408 off_t startoff; 1409 off_t cnt = 0; 1410 struct tmpfs_node *node; 1411 struct mount *mp = vp->v_mount; 1412 1413 lwkt_gettoken(&mp->mnt_token); 1414 1415 /* This operation only makes sense on directory nodes. */ 1416 if (vp->v_type != VDIR) { 1417 lwkt_reltoken(&mp->mnt_token); 1418 return ENOTDIR; 1419 } 1420 1421 tmp = VFS_TO_TMPFS(vp->v_mount); 1422 node = VP_TO_TMPFS_DIR(vp); 1423 startoff = uio->uio_offset; 1424 1425 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1426 error = tmpfs_dir_getdotdent(node, uio); 1427 if (error != 0) 1428 goto outok; 1429 cnt++; 1430 } 1431 1432 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1433 error = tmpfs_dir_getdotdotdent(tmp, node, uio); 1434 if (error != 0) 1435 goto outok; 1436 cnt++; 1437 } 1438 1439 error = tmpfs_dir_getdents(node, uio, &cnt); 1440 1441 outok: 1442 KKASSERT(error >= -1); 1443 1444 if (error == -1) 1445 error = 0; 1446 1447 if (eofflag != NULL) 1448 *eofflag = 1449 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1450 1451 /* Update NFS-related variables. */ 1452 if (error == 0 && cookies != NULL && ncookies != NULL) { 1453 off_t i; 1454 off_t off = startoff; 1455 struct tmpfs_dirent *de = NULL; 1456 1457 *ncookies = cnt; 1458 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1459 1460 for (i = 0; i < cnt; i++) { 1461 KKASSERT(off != TMPFS_DIRCOOKIE_EOF); 1462 if (off == TMPFS_DIRCOOKIE_DOT) { 1463 off = TMPFS_DIRCOOKIE_DOTDOT; 1464 } else { 1465 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1466 de = RB_MIN(tmpfs_dirtree, &node->tn_dir.tn_dirtree); 1467 } else if (de != NULL) { 1468 de = RB_NEXT(tmpfs_dirtree, &node->tn_dir.tn_dirtree, de); 1469 } else { 1470 de = tmpfs_dir_lookupbycookie(node, 1471 off); 1472 KKASSERT(de != NULL); 1473 de = RB_NEXT(tmpfs_dirtree, &node->tn_dir.tn_dirtree, de); 1474 } 1475 if (de == NULL) 1476 off = TMPFS_DIRCOOKIE_EOF; 1477 else 1478 off = tmpfs_dircookie(de); 1479 } 1480 1481 (*cookies)[i] = off; 1482 } 1483 KKASSERT(uio->uio_offset == off); 1484 } 1485 1486 lwkt_reltoken(&mp->mnt_token); 1487 1488 return error; 1489 } 1490 1491 /* --------------------------------------------------------------------- */ 1492 1493 static int 1494 tmpfs_readlink(struct vop_readlink_args *v) 1495 { 1496 struct vnode *vp = v->a_vp; 1497 struct uio *uio = v->a_uio; 1498 struct mount *mp = vp->v_mount; 1499 int error; 1500 struct tmpfs_node *node; 1501 1502 lwkt_gettoken(&mp->mnt_token); 1503 1504 KKASSERT(uio->uio_offset == 0); 1505 KKASSERT(vp->v_type == VLNK); 1506 1507 node = VP_TO_TMPFS_NODE(vp); 1508 1509 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1510 uio); 1511 TMPFS_NODE_LOCK(node); 1512 node->tn_status |= TMPFS_NODE_ACCESSED; 1513 TMPFS_NODE_UNLOCK(node); 1514 1515 lwkt_reltoken(&mp->mnt_token); 1516 1517 return error; 1518 } 1519 1520 /* --------------------------------------------------------------------- */ 1521 1522 static int 1523 tmpfs_inactive(struct vop_inactive_args *v) 1524 { 1525 struct vnode *vp = v->a_vp; 1526 struct tmpfs_node *node; 1527 struct mount *mp; 1528 1529 mp = vp->v_mount; 1530 lwkt_gettoken(&mp->mnt_token); 1531 node = VP_TO_TMPFS_NODE(vp); 1532 1533 /* 1534 * Degenerate case 1535 */ 1536 if (node == NULL) { 1537 vrecycle(vp); 1538 lwkt_reltoken(&mp->mnt_token); 1539 return(0); 1540 } 1541 1542 /* 1543 * Get rid of unreferenced deleted vnodes sooner rather than 1544 * later so the data memory can be recovered immediately. 1545 * 1546 * We must truncate the vnode to prevent the normal reclamation 1547 * path from flushing the data for the removed file to disk. 1548 */ 1549 TMPFS_NODE_LOCK(node); 1550 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1551 node->tn_links == 0) 1552 { 1553 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1554 TMPFS_NODE_UNLOCK(node); 1555 if (node->tn_type == VREG) 1556 tmpfs_truncate(vp, 0); 1557 vrecycle(vp); 1558 } else { 1559 TMPFS_NODE_UNLOCK(node); 1560 } 1561 lwkt_reltoken(&mp->mnt_token); 1562 1563 return 0; 1564 } 1565 1566 /* --------------------------------------------------------------------- */ 1567 1568 int 1569 tmpfs_reclaim(struct vop_reclaim_args *v) 1570 { 1571 struct vnode *vp = v->a_vp; 1572 struct tmpfs_mount *tmp; 1573 struct tmpfs_node *node; 1574 struct mount *mp; 1575 1576 mp = vp->v_mount; 1577 lwkt_gettoken(&mp->mnt_token); 1578 1579 node = VP_TO_TMPFS_NODE(vp); 1580 tmp = VFS_TO_TMPFS(vp->v_mount); 1581 KKASSERT(mp == tmp->tm_mount); 1582 1583 tmpfs_free_vp(vp); 1584 1585 /* 1586 * If the node referenced by this vnode was deleted by the 1587 * user, we must free its associated data structures now that 1588 * the vnode is being reclaimed. 1589 * 1590 * Directories have an extra link ref. 1591 */ 1592 TMPFS_NODE_LOCK(node); 1593 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 && 1594 node->tn_links == 0) { 1595 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1596 tmpfs_free_node(tmp, node); 1597 /* eats the lock */ 1598 } else { 1599 TMPFS_NODE_UNLOCK(node); 1600 } 1601 lwkt_reltoken(&mp->mnt_token); 1602 1603 KKASSERT(vp->v_data == NULL); 1604 return 0; 1605 } 1606 1607 /* --------------------------------------------------------------------- */ 1608 1609 static int 1610 tmpfs_mountctl(struct vop_mountctl_args *ap) 1611 { 1612 struct tmpfs_mount *tmp; 1613 struct mount *mp; 1614 int rc; 1615 1616 mp = ap->a_head.a_ops->head.vv_mount; 1617 lwkt_gettoken(&mp->mnt_token); 1618 1619 switch (ap->a_op) { 1620 case (MOUNTCTL_SET_EXPORT): 1621 tmp = (struct tmpfs_mount *) mp->mnt_data; 1622 1623 if (ap->a_ctllen != sizeof(struct export_args)) 1624 rc = (EINVAL); 1625 else 1626 rc = vfs_export(mp, &tmp->tm_export, 1627 (const struct export_args *) ap->a_ctl); 1628 break; 1629 default: 1630 rc = vop_stdmountctl(ap); 1631 break; 1632 } 1633 1634 lwkt_reltoken(&mp->mnt_token); 1635 return (rc); 1636 } 1637 1638 /* --------------------------------------------------------------------- */ 1639 1640 static int 1641 tmpfs_print(struct vop_print_args *v) 1642 { 1643 struct vnode *vp = v->a_vp; 1644 1645 struct tmpfs_node *node; 1646 1647 node = VP_TO_TMPFS_NODE(vp); 1648 1649 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1650 node, node->tn_flags, node->tn_links); 1651 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n", 1652 node->tn_mode, node->tn_uid, node->tn_gid, 1653 (uintmax_t)node->tn_size, node->tn_status); 1654 1655 if (vp->v_type == VFIFO) 1656 fifo_printinfo(vp); 1657 1658 kprintf("\n"); 1659 1660 return 0; 1661 } 1662 1663 /* --------------------------------------------------------------------- */ 1664 1665 static int 1666 tmpfs_pathconf(struct vop_pathconf_args *v) 1667 { 1668 int name = v->a_name; 1669 register_t *retval = v->a_retval; 1670 1671 int error; 1672 1673 error = 0; 1674 1675 switch (name) { 1676 case _PC_LINK_MAX: 1677 *retval = LINK_MAX; 1678 break; 1679 1680 case _PC_NAME_MAX: 1681 *retval = NAME_MAX; 1682 break; 1683 1684 case _PC_PATH_MAX: 1685 *retval = PATH_MAX; 1686 break; 1687 1688 case _PC_PIPE_BUF: 1689 *retval = PIPE_BUF; 1690 break; 1691 1692 case _PC_CHOWN_RESTRICTED: 1693 *retval = 1; 1694 break; 1695 1696 case _PC_NO_TRUNC: 1697 *retval = 1; 1698 break; 1699 1700 case _PC_SYNC_IO: 1701 *retval = 1; 1702 break; 1703 1704 case _PC_FILESIZEBITS: 1705 *retval = 0; /* XXX Don't know which value should I return. */ 1706 break; 1707 1708 default: 1709 error = EINVAL; 1710 } 1711 1712 return error; 1713 } 1714 1715 /************************************************************************ 1716 * KQFILTER OPS * 1717 ************************************************************************/ 1718 1719 static void filt_tmpfsdetach(struct knote *kn); 1720 static int filt_tmpfsread(struct knote *kn, long hint); 1721 static int filt_tmpfswrite(struct knote *kn, long hint); 1722 static int filt_tmpfsvnode(struct knote *kn, long hint); 1723 1724 static struct filterops tmpfsread_filtops = 1725 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread }; 1726 static struct filterops tmpfswrite_filtops = 1727 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite }; 1728 static struct filterops tmpfsvnode_filtops = 1729 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode }; 1730 1731 static int 1732 tmpfs_kqfilter (struct vop_kqfilter_args *ap) 1733 { 1734 struct vnode *vp = ap->a_vp; 1735 struct knote *kn = ap->a_kn; 1736 1737 switch (kn->kn_filter) { 1738 case EVFILT_READ: 1739 kn->kn_fop = &tmpfsread_filtops; 1740 break; 1741 case EVFILT_WRITE: 1742 kn->kn_fop = &tmpfswrite_filtops; 1743 break; 1744 case EVFILT_VNODE: 1745 kn->kn_fop = &tmpfsvnode_filtops; 1746 break; 1747 default: 1748 return (EOPNOTSUPP); 1749 } 1750 1751 kn->kn_hook = (caddr_t)vp; 1752 1753 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1754 1755 return(0); 1756 } 1757 1758 static void 1759 filt_tmpfsdetach(struct knote *kn) 1760 { 1761 struct vnode *vp = (void *)kn->kn_hook; 1762 1763 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 1764 } 1765 1766 static int 1767 filt_tmpfsread(struct knote *kn, long hint) 1768 { 1769 struct vnode *vp = (void *)kn->kn_hook; 1770 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 1771 off_t off; 1772 1773 if (hint == NOTE_REVOKE) { 1774 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1775 return(1); 1776 } 1777 1778 /* 1779 * Interlock against MP races when performing this function. 1780 */ 1781 lwkt_gettoken(&vp->v_mount->mnt_token); 1782 off = node->tn_size - kn->kn_fp->f_offset; 1783 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1784 if (kn->kn_sfflags & NOTE_OLDAPI) { 1785 lwkt_reltoken(&vp->v_mount->mnt_token); 1786 return(1); 1787 } 1788 1789 if (kn->kn_data == 0) { 1790 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 1791 } 1792 lwkt_reltoken(&vp->v_mount->mnt_token); 1793 return (kn->kn_data != 0); 1794 } 1795 1796 static int 1797 filt_tmpfswrite(struct knote *kn, long hint) 1798 { 1799 if (hint == NOTE_REVOKE) 1800 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 1801 kn->kn_data = 0; 1802 return (1); 1803 } 1804 1805 static int 1806 filt_tmpfsvnode(struct knote *kn, long hint) 1807 { 1808 if (kn->kn_sfflags & hint) 1809 kn->kn_fflags |= hint; 1810 if (hint == NOTE_REVOKE) { 1811 kn->kn_flags |= (EV_EOF | EV_NODATA); 1812 return (1); 1813 } 1814 return (kn->kn_fflags != 0); 1815 } 1816 1817 1818 /* --------------------------------------------------------------------- */ 1819 1820 /* 1821 * vnode operations vector used for files stored in a tmpfs file system. 1822 */ 1823 struct vop_ops tmpfs_vnode_vops = { 1824 .vop_default = vop_defaultop, 1825 .vop_getpages = vop_stdgetpages, 1826 .vop_putpages = vop_stdputpages, 1827 .vop_ncreate = tmpfs_ncreate, 1828 .vop_nresolve = tmpfs_nresolve, 1829 .vop_nlookupdotdot = tmpfs_nlookupdotdot, 1830 .vop_nmknod = tmpfs_nmknod, 1831 .vop_open = tmpfs_open, 1832 .vop_close = tmpfs_close, 1833 .vop_access = tmpfs_access, 1834 .vop_getattr = tmpfs_getattr, 1835 .vop_setattr = tmpfs_setattr, 1836 .vop_read = tmpfs_read, 1837 .vop_write = tmpfs_write, 1838 .vop_fsync = tmpfs_fsync, 1839 .vop_mountctl = tmpfs_mountctl, 1840 .vop_nremove = tmpfs_nremove, 1841 .vop_nlink = tmpfs_nlink, 1842 .vop_nrename = tmpfs_nrename, 1843 .vop_nmkdir = tmpfs_nmkdir, 1844 .vop_nrmdir = tmpfs_nrmdir, 1845 .vop_nsymlink = tmpfs_nsymlink, 1846 .vop_readdir = tmpfs_readdir, 1847 .vop_readlink = tmpfs_readlink, 1848 .vop_inactive = tmpfs_inactive, 1849 .vop_reclaim = tmpfs_reclaim, 1850 .vop_print = tmpfs_print, 1851 .vop_pathconf = tmpfs_pathconf, 1852 .vop_bmap = tmpfs_bmap, 1853 .vop_strategy = tmpfs_strategy, 1854 .vop_advlock = tmpfs_advlock, 1855 .vop_kqfilter = tmpfs_kqfilter 1856 }; 1857