tmpfs_vnops.c revision 197953
1/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3/*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * tmpfs vnode interface. 35 */ 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vnops.c 197953 2009-10-11 07:03:56Z delphij $"); 38 39#include <sys/param.h> 40#include <sys/fcntl.h> 41#include <sys/lockf.h> 42#include <sys/namei.h> 43#include <sys/priv.h> 44#include <sys/proc.h> 45#include <sys/resourcevar.h> 46#include <sys/sched.h> 47#include <sys/sf_buf.h> 48#include <sys/stat.h> 49#include <sys/systm.h> 50#include <sys/unistd.h> 51#include <sys/vnode.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 58#include <machine/_inttypes.h> 59 60#include <fs/fifofs/fifo.h> 61#include <fs/tmpfs/tmpfs_vnops.h> 62#include <fs/tmpfs/tmpfs.h> 63 64/* --------------------------------------------------------------------- */ 65 66static int 67tmpfs_lookup(struct vop_cachedlookup_args *v) 68{ 69 struct vnode *dvp = v->a_dvp; 70 struct vnode **vpp = v->a_vpp; 71 struct componentname *cnp = v->a_cnp; 72 73 int error; 74 struct tmpfs_dirent *de; 75 struct tmpfs_node *dnode; 76 77 dnode = VP_TO_TMPFS_DIR(dvp); 78 *vpp = NULLVP; 79 80 /* Check accessibility of requested node as a first step. */ 81 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 82 if (error != 0) 83 goto out; 84 85 /* We cannot be requesting the parent directory of the root node. */ 86 MPASS(IMPLIES(dnode->tn_type == VDIR && 87 dnode->tn_dir.tn_parent == dnode, 88 !(cnp->cn_flags & ISDOTDOT))); 89 90 TMPFS_ASSERT_LOCKED(dnode); 91 if (dnode->tn_dir.tn_parent == NULL) { 92 error = ENOENT; 93 goto out; 94 } 95 if (cnp->cn_flags & ISDOTDOT) { 96 int ltype = 0; 97 98 ltype = VOP_ISLOCKED(dvp); 99 vhold(dvp); 100 VOP_UNLOCK(dvp, 0); 101 /* Allocate a new vnode on the matching entry. */ 102 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 103 cnp->cn_lkflags, vpp); 104 105 vn_lock(dvp, ltype | LK_RETRY); 106 vdrop(dvp); 107 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 108 VREF(dvp); 109 *vpp = dvp; 110 error = 0; 111 } else { 112 de = tmpfs_dir_lookup(dnode, NULL, cnp); 113 if (de == NULL) { 114 /* The entry was not found in the directory. 115 * This is OK if we are creating or renaming an 116 * entry and are working on the last component of 117 * the path name. */ 118 if ((cnp->cn_flags & ISLASTCN) && 119 (cnp->cn_nameiop == CREATE || \ 120 cnp->cn_nameiop == RENAME)) { 121 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 122 cnp->cn_thread); 123 if (error != 0) 124 goto out; 125 126 /* Keep the component name in the buffer for 127 * future uses. */ 128 cnp->cn_flags |= SAVENAME; 129 130 error = EJUSTRETURN; 131 } else 132 error = ENOENT; 133 } else { 134 struct tmpfs_node *tnode; 135 136 /* The entry was found, so get its associated 137 * tmpfs_node. */ 138 tnode = de->td_node; 139 140 /* If we are not at the last path component and 141 * found a non-directory or non-link entry (which 142 * may itself be pointing to a directory), raise 143 * an error. */ 144 if ((tnode->tn_type != VDIR && 145 tnode->tn_type != VLNK) && 146 !(cnp->cn_flags & ISLASTCN)) { 147 error = ENOTDIR; 148 goto out; 149 } 150 151 /* If we are deleting or renaming the entry, keep 152 * track of its tmpfs_dirent so that it can be 153 * easily deleted later. */ 154 if ((cnp->cn_flags & ISLASTCN) && 155 (cnp->cn_nameiop == DELETE || 156 cnp->cn_nameiop == RENAME)) { 157 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 158 cnp->cn_thread); 159 if (error != 0) 160 goto out; 161 162 /* Allocate a new vnode on the matching entry. */ 163 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 164 cnp->cn_lkflags, vpp); 165 if (error != 0) 166 goto out; 167 168 if ((dnode->tn_mode & S_ISTXT) && 169 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 170 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 171 error = EPERM; 172 vput(*vpp); 173 *vpp = NULL; 174 goto out; 175 } 176 cnp->cn_flags |= SAVENAME; 177 } else { 178 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 179 cnp->cn_lkflags, vpp); 180 } 181 } 182 } 183 184 /* Store the result of this lookup in the cache. Avoid this if the 185 * request was for creation, as it does not improve timings on 186 * emprical tests. */ 187 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 188 cache_enter(dvp, *vpp, cnp); 189 190out: 191 /* If there were no errors, *vpp cannot be null and it must be 192 * locked. */ 193 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 194 195 return error; 196} 197 198/* --------------------------------------------------------------------- */ 199 200static int 201tmpfs_create(struct vop_create_args *v) 202{ 203 struct vnode *dvp = v->a_dvp; 204 struct vnode **vpp = v->a_vpp; 205 struct componentname *cnp = v->a_cnp; 206 struct vattr *vap = v->a_vap; 207 208 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 209 210 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 211} 212/* --------------------------------------------------------------------- */ 213 214static int 215tmpfs_mknod(struct vop_mknod_args *v) 216{ 217 struct vnode *dvp = v->a_dvp; 218 struct vnode **vpp = v->a_vpp; 219 struct componentname *cnp = v->a_cnp; 220 struct vattr *vap = v->a_vap; 221 222 if (vap->va_type != VBLK && vap->va_type != VCHR && 223 vap->va_type != VFIFO) 224 return EINVAL; 225 226 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 227} 228 229/* --------------------------------------------------------------------- */ 230 231static int 232tmpfs_open(struct vop_open_args *v) 233{ 234 struct vnode *vp = v->a_vp; 235 int mode = v->a_mode; 236 237 int error; 238 struct tmpfs_node *node; 239 240 MPASS(VOP_ISLOCKED(vp)); 241 242 node = VP_TO_TMPFS_NODE(vp); 243 244 /* The file is still active but all its names have been removed 245 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 246 * it is about to die. */ 247 if (node->tn_links < 1) 248 return (ENOENT); 249 250 /* If the file is marked append-only, deny write requests. */ 251 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 252 error = EPERM; 253 else { 254 error = 0; 255 vnode_create_vobject(vp, node->tn_size, v->a_td); 256 } 257 258 MPASS(VOP_ISLOCKED(vp)); 259 return error; 260} 261 262/* --------------------------------------------------------------------- */ 263 264static int 265tmpfs_close(struct vop_close_args *v) 266{ 267 struct vnode *vp = v->a_vp; 268 269 struct tmpfs_node *node; 270 271 MPASS(VOP_ISLOCKED(vp)); 272 273 node = VP_TO_TMPFS_NODE(vp); 274 275 if (node->tn_links > 0) { 276 /* Update node times. No need to do it if the node has 277 * been deleted, because it will vanish after we return. */ 278 tmpfs_update(vp); 279 } 280 281 return 0; 282} 283 284/* --------------------------------------------------------------------- */ 285 286int 287tmpfs_access(struct vop_access_args *v) 288{ 289 struct vnode *vp = v->a_vp; 290 accmode_t accmode = v->a_accmode; 291 struct ucred *cred = v->a_cred; 292 293 int error; 294 struct tmpfs_node *node; 295 296 MPASS(VOP_ISLOCKED(vp)); 297 298 node = VP_TO_TMPFS_NODE(vp); 299 300 switch (vp->v_type) { 301 case VDIR: 302 /* FALLTHROUGH */ 303 case VLNK: 304 /* FALLTHROUGH */ 305 case VREG: 306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 307 error = EROFS; 308 goto out; 309 } 310 break; 311 312 case VBLK: 313 /* FALLTHROUGH */ 314 case VCHR: 315 /* FALLTHROUGH */ 316 case VSOCK: 317 /* FALLTHROUGH */ 318 case VFIFO: 319 break; 320 321 default: 322 error = EINVAL; 323 goto out; 324 } 325 326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 327 error = EPERM; 328 goto out; 329 } 330 331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 332 node->tn_gid, accmode, cred, NULL); 333 334out: 335 MPASS(VOP_ISLOCKED(vp)); 336 337 return error; 338} 339 340/* --------------------------------------------------------------------- */ 341 342int 343tmpfs_getattr(struct vop_getattr_args *v) 344{ 345 struct vnode *vp = v->a_vp; 346 struct vattr *vap = v->a_vap; 347 348 struct tmpfs_node *node; 349 350 node = VP_TO_TMPFS_NODE(vp); 351 352 tmpfs_update(vp); 353 354 vap->va_type = vp->v_type; 355 vap->va_mode = node->tn_mode; 356 vap->va_nlink = node->tn_links; 357 vap->va_uid = node->tn_uid; 358 vap->va_gid = node->tn_gid; 359 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 360 vap->va_fileid = node->tn_id; 361 vap->va_size = node->tn_size; 362 vap->va_blocksize = PAGE_SIZE; 363 vap->va_atime = node->tn_atime; 364 vap->va_mtime = node->tn_mtime; 365 vap->va_ctime = node->tn_ctime; 366 vap->va_birthtime = node->tn_birthtime; 367 vap->va_gen = node->tn_gen; 368 vap->va_flags = node->tn_flags; 369 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 370 node->tn_rdev : NODEV; 371 vap->va_bytes = round_page(node->tn_size); 372 vap->va_filerev = 0; 373 374 return 0; 375} 376 377/* --------------------------------------------------------------------- */ 378 379/* XXX Should this operation be atomic? I think it should, but code in 380 * XXX other places (e.g., ufs) doesn't seem to be... */ 381int 382tmpfs_setattr(struct vop_setattr_args *v) 383{ 384 struct vnode *vp = v->a_vp; 385 struct vattr *vap = v->a_vap; 386 struct ucred *cred = v->a_cred; 387 struct thread *td = curthread; 388 389 int error; 390 391 MPASS(VOP_ISLOCKED(vp)); 392 393 error = 0; 394 395 /* Abort if any unsettable attribute is given. */ 396 if (vap->va_type != VNON || 397 vap->va_nlink != VNOVAL || 398 vap->va_fsid != VNOVAL || 399 vap->va_fileid != VNOVAL || 400 vap->va_blocksize != VNOVAL || 401 vap->va_gen != VNOVAL || 402 vap->va_rdev != VNOVAL || 403 vap->va_bytes != VNOVAL) 404 error = EINVAL; 405 406 if (error == 0 && (vap->va_flags != VNOVAL)) 407 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 408 409 if (error == 0 && (vap->va_size != VNOVAL)) 410 error = tmpfs_chsize(vp, vap->va_size, cred, td); 411 412 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 413 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 414 415 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 416 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 417 418 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 419 vap->va_atime.tv_nsec != VNOVAL) || 420 (vap->va_mtime.tv_sec != VNOVAL && 421 vap->va_mtime.tv_nsec != VNOVAL) || 422 (vap->va_birthtime.tv_sec != VNOVAL && 423 vap->va_birthtime.tv_nsec != VNOVAL))) 424 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 425 &vap->va_birthtime, vap->va_vaflags, cred, td); 426 427 /* Update the node times. We give preference to the error codes 428 * generated by this function rather than the ones that may arise 429 * from tmpfs_update. */ 430 tmpfs_update(vp); 431 432 MPASS(VOP_ISLOCKED(vp)); 433 434 return error; 435} 436 437/* --------------------------------------------------------------------- */ 438static int 439tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 440 vm_offset_t offset, size_t tlen, struct uio *uio) 441{ 442 vm_page_t m; 443 int error; 444 445 VM_OBJECT_LOCK(tobj); 446 vm_object_pip_add(tobj, 1); 447 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 448 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 449 if (m->valid != VM_PAGE_BITS_ALL) { 450 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 451 error = vm_pager_get_pages(tobj, &m, 1, 0); 452 if (error != 0) { 453 printf("tmpfs get pages from pager error [read]\n"); 454 goto out; 455 } 456 } else 457 vm_page_zero_invalid(m, TRUE); 458 } 459 VM_OBJECT_UNLOCK(tobj); 460 error = uiomove_fromphys(&m, offset, tlen, uio); 461 VM_OBJECT_LOCK(tobj); 462out: 463 vm_page_lock_queues(); 464 vm_page_unwire(m, TRUE); 465 vm_page_unlock_queues(); 466 vm_page_wakeup(m); 467 vm_object_pip_subtract(tobj, 1); 468 VM_OBJECT_UNLOCK(tobj); 469 470 return (error); 471} 472 473static __inline int 474tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 475 vm_offset_t offset, size_t tlen, void *buf) 476{ 477 struct uio uio; 478 struct iovec iov; 479 480 uio.uio_iovcnt = 1; 481 uio.uio_iov = &iov; 482 iov.iov_base = buf; 483 iov.iov_len = tlen; 484 485 uio.uio_offset = 0; 486 uio.uio_resid = tlen; 487 uio.uio_rw = UIO_READ; 488 uio.uio_segflg = UIO_SYSSPACE; 489 uio.uio_td = curthread; 490 491 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 492} 493 494static int 495tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 496{ 497 struct sf_buf *sf; 498 vm_pindex_t idx; 499 vm_page_t m; 500 vm_offset_t offset; 501 off_t addr; 502 size_t tlen; 503 char *ma; 504 int error; 505 506 addr = uio->uio_offset; 507 idx = OFF_TO_IDX(addr); 508 offset = addr & PAGE_MASK; 509 tlen = MIN(PAGE_SIZE - offset, len); 510 511 if ((vobj == NULL) || 512 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 513 goto nocache; 514 515 VM_OBJECT_LOCK(vobj); 516lookupvpg: 517 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 518 vm_page_is_valid(m, offset, tlen)) { 519 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 520 goto lookupvpg; 521 vm_page_busy(m); 522 VM_OBJECT_UNLOCK(vobj); 523 error = uiomove_fromphys(&m, offset, tlen, uio); 524 VM_OBJECT_LOCK(vobj); 525 vm_page_wakeup(m); 526 VM_OBJECT_UNLOCK(vobj); 527 return (error); 528 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 529 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 530 goto lookupvpg; 531 vm_page_busy(m); 532 VM_OBJECT_UNLOCK(vobj); 533 sched_pin(); 534 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 535 ma = (char *)sf_buf_kva(sf); 536 error = tmpfs_nocacheread_buf(tobj, idx, offset, tlen, 537 ma + offset); 538 if (error == 0) { 539 uio->uio_offset += tlen; 540 uio->uio_resid -= tlen; 541 } 542 sf_buf_free(sf); 543 sched_unpin(); 544 VM_OBJECT_LOCK(vobj); 545 vm_page_wakeup(m); 546 VM_OBJECT_UNLOCK(vobj); 547 return (error); 548 } 549 VM_OBJECT_UNLOCK(vobj); 550nocache: 551 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 552 553 return (error); 554} 555 556static int 557tmpfs_read(struct vop_read_args *v) 558{ 559 struct vnode *vp = v->a_vp; 560 struct uio *uio = v->a_uio; 561 562 struct tmpfs_node *node; 563 vm_object_t uobj; 564 size_t len; 565 int resid; 566 567 int error = 0; 568 569 node = VP_TO_TMPFS_NODE(vp); 570 571 if (vp->v_type != VREG) { 572 error = EISDIR; 573 goto out; 574 } 575 576 if (uio->uio_offset < 0) { 577 error = EINVAL; 578 goto out; 579 } 580 581 node->tn_status |= TMPFS_NODE_ACCESSED; 582 583 uobj = node->tn_reg.tn_aobj; 584 while ((resid = uio->uio_resid) > 0) { 585 error = 0; 586 if (node->tn_size <= uio->uio_offset) 587 break; 588 len = MIN(node->tn_size - uio->uio_offset, resid); 589 if (len == 0) 590 break; 591 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 592 if ((error != 0) || (resid == uio->uio_resid)) 593 break; 594 } 595 596out: 597 598 return error; 599} 600 601/* --------------------------------------------------------------------- */ 602 603static int 604tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 605{ 606 vm_pindex_t idx; 607 vm_page_t vpg, tpg; 608 vm_offset_t offset; 609 off_t addr; 610 size_t tlen; 611 int error; 612 613 error = 0; 614 615 addr = uio->uio_offset; 616 idx = OFF_TO_IDX(addr); 617 offset = addr & PAGE_MASK; 618 tlen = MIN(PAGE_SIZE - offset, len); 619 620 if ((vobj == NULL) || 621 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 622 vpg = NULL; 623 goto nocache; 624 } 625 626 VM_OBJECT_LOCK(vobj); 627lookupvpg: 628 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 629 vm_page_is_valid(vpg, offset, tlen)) { 630 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 631 goto lookupvpg; 632 vm_page_busy(vpg); 633 vm_page_lock_queues(); 634 vm_page_undirty(vpg); 635 vm_page_unlock_queues(); 636 VM_OBJECT_UNLOCK(vobj); 637 error = uiomove_fromphys(&vpg, offset, tlen, uio); 638 } else { 639 if (__predict_false(vobj->cache != NULL)) 640 vm_page_cache_free(vobj, idx, idx + 1); 641 VM_OBJECT_UNLOCK(vobj); 642 vpg = NULL; 643 } 644nocache: 645 VM_OBJECT_LOCK(tobj); 646 vm_object_pip_add(tobj, 1); 647 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 648 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 649 if (tpg->valid != VM_PAGE_BITS_ALL) { 650 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 651 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 652 if (error != 0) { 653 printf("tmpfs get pages from pager error [write]\n"); 654 goto out; 655 } 656 } else 657 vm_page_zero_invalid(tpg, TRUE); 658 } 659 VM_OBJECT_UNLOCK(tobj); 660 if (vpg == NULL) 661 error = uiomove_fromphys(&tpg, offset, tlen, uio); 662 else { 663 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 664 pmap_copy_page(vpg, tpg); 665 } 666 VM_OBJECT_LOCK(tobj); 667out: 668 if (vobj != NULL) 669 VM_OBJECT_LOCK(vobj); 670 vm_page_lock_queues(); 671 if (error == 0) { 672 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 673 ("parts of tpg invalid")); 674 vm_page_dirty(tpg); 675 } 676 vm_page_unwire(tpg, TRUE); 677 vm_page_unlock_queues(); 678 vm_page_wakeup(tpg); 679 if (vpg != NULL) 680 vm_page_wakeup(vpg); 681 if (vobj != NULL) 682 VM_OBJECT_UNLOCK(vobj); 683 vm_object_pip_subtract(tobj, 1); 684 VM_OBJECT_UNLOCK(tobj); 685 686 return (error); 687} 688 689static int 690tmpfs_write(struct vop_write_args *v) 691{ 692 struct vnode *vp = v->a_vp; 693 struct uio *uio = v->a_uio; 694 int ioflag = v->a_ioflag; 695 struct thread *td = uio->uio_td; 696 697 boolean_t extended; 698 int error = 0; 699 off_t oldsize; 700 struct tmpfs_node *node; 701 vm_object_t uobj; 702 size_t len; 703 int resid; 704 705 node = VP_TO_TMPFS_NODE(vp); 706 oldsize = node->tn_size; 707 708 if (uio->uio_offset < 0 || vp->v_type != VREG) { 709 error = EINVAL; 710 goto out; 711 } 712 713 if (uio->uio_resid == 0) { 714 error = 0; 715 goto out; 716 } 717 718 if (ioflag & IO_APPEND) 719 uio->uio_offset = node->tn_size; 720 721 if (uio->uio_offset + uio->uio_resid > 722 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 723 return (EFBIG); 724 725 if (vp->v_type == VREG && td != NULL) { 726 PROC_LOCK(td->td_proc); 727 if (uio->uio_offset + uio->uio_resid > 728 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 729 psignal(td->td_proc, SIGXFSZ); 730 PROC_UNLOCK(td->td_proc); 731 return (EFBIG); 732 } 733 PROC_UNLOCK(td->td_proc); 734 } 735 736 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 737 if (extended) { 738 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 739 if (error != 0) 740 goto out; 741 } 742 743 uobj = node->tn_reg.tn_aobj; 744 while ((resid = uio->uio_resid) > 0) { 745 if (node->tn_size <= uio->uio_offset) 746 break; 747 len = MIN(node->tn_size - uio->uio_offset, resid); 748 if (len == 0) 749 break; 750 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 751 if ((error != 0) || (resid == uio->uio_resid)) 752 break; 753 } 754 755 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 756 (extended ? TMPFS_NODE_CHANGED : 0); 757 758 if (node->tn_mode & (S_ISUID | S_ISGID)) { 759 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 760 node->tn_mode &= ~(S_ISUID | S_ISGID); 761 } 762 763 if (error != 0) 764 (void)tmpfs_reg_resize(vp, oldsize); 765 766out: 767 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 768 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 769 770 return error; 771} 772 773/* --------------------------------------------------------------------- */ 774 775static int 776tmpfs_fsync(struct vop_fsync_args *v) 777{ 778 struct vnode *vp = v->a_vp; 779 780 MPASS(VOP_ISLOCKED(vp)); 781 782 tmpfs_update(vp); 783 784 return 0; 785} 786 787/* --------------------------------------------------------------------- */ 788 789static int 790tmpfs_remove(struct vop_remove_args *v) 791{ 792 struct vnode *dvp = v->a_dvp; 793 struct vnode *vp = v->a_vp; 794 795 int error; 796 struct tmpfs_dirent *de; 797 struct tmpfs_mount *tmp; 798 struct tmpfs_node *dnode; 799 struct tmpfs_node *node; 800 801 MPASS(VOP_ISLOCKED(dvp)); 802 MPASS(VOP_ISLOCKED(vp)); 803 804 if (vp->v_type == VDIR) { 805 error = EISDIR; 806 goto out; 807 } 808 809 dnode = VP_TO_TMPFS_DIR(dvp); 810 node = VP_TO_TMPFS_NODE(vp); 811 tmp = VFS_TO_TMPFS(vp->v_mount); 812 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 813 MPASS(de != NULL); 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(dvp, 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, TRUE); 830 831 if (node->tn_links > 0) 832 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 833 TMPFS_NODE_MODIFIED; 834 error = 0; 835 836out: 837 838 return error; 839} 840 841/* --------------------------------------------------------------------- */ 842 843static int 844tmpfs_link(struct vop_link_args *v) 845{ 846 struct vnode *dvp = v->a_tdvp; 847 struct vnode *vp = v->a_vp; 848 struct componentname *cnp = v->a_cnp; 849 850 int error; 851 struct tmpfs_dirent *de; 852 struct tmpfs_node *node; 853 854 MPASS(VOP_ISLOCKED(dvp)); 855 MPASS(cnp->cn_flags & HASBUF); 856 MPASS(dvp != vp); /* XXX When can this be false? */ 857 858 node = VP_TO_TMPFS_NODE(vp); 859 860 /* XXX: Why aren't the following two tests done by the caller? */ 861 862 /* Hard links of directories are forbidden. */ 863 if (vp->v_type == VDIR) { 864 error = EPERM; 865 goto out; 866 } 867 868 /* Cannot create cross-device links. */ 869 if (dvp->v_mount != vp->v_mount) { 870 error = EXDEV; 871 goto out; 872 } 873 874 /* Ensure that we do not overflow the maximum number of links imposed 875 * by the system. */ 876 MPASS(node->tn_links <= LINK_MAX); 877 if (node->tn_links == LINK_MAX) { 878 error = EMLINK; 879 goto out; 880 } 881 882 /* We cannot create links of files marked immutable or append-only. */ 883 if (node->tn_flags & (IMMUTABLE | APPEND)) { 884 error = EPERM; 885 goto out; 886 } 887 888 /* Allocate a new directory entry to represent the node. */ 889 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 890 cnp->cn_nameptr, cnp->cn_namelen, &de); 891 if (error != 0) 892 goto out; 893 894 /* Insert the new directory entry into the appropriate directory. */ 895 tmpfs_dir_attach(dvp, de); 896 897 /* vp link count has changed, so update node times. */ 898 node->tn_status |= TMPFS_NODE_CHANGED; 899 tmpfs_update(vp); 900 901 error = 0; 902 903out: 904 return error; 905} 906 907/* --------------------------------------------------------------------- */ 908 909static int 910tmpfs_rename(struct vop_rename_args *v) 911{ 912 struct vnode *fdvp = v->a_fdvp; 913 struct vnode *fvp = v->a_fvp; 914 struct componentname *fcnp = v->a_fcnp; 915 struct vnode *tdvp = v->a_tdvp; 916 struct vnode *tvp = v->a_tvp; 917 struct componentname *tcnp = v->a_tcnp; 918 919 char *newname; 920 int error; 921 struct tmpfs_dirent *de; 922 struct tmpfs_mount *tmp; 923 struct tmpfs_node *fdnode; 924 struct tmpfs_node *fnode; 925 struct tmpfs_node *tnode; 926 struct tmpfs_node *tdnode; 927 928 MPASS(VOP_ISLOCKED(tdvp)); 929 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 930 MPASS(fcnp->cn_flags & HASBUF); 931 MPASS(tcnp->cn_flags & HASBUF); 932 933 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 934 935 /* Disallow cross-device renames. 936 * XXX Why isn't this done by the caller? */ 937 if (fvp->v_mount != tdvp->v_mount || 938 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 939 error = EXDEV; 940 goto out; 941 } 942 943 tmp = VFS_TO_TMPFS(tdvp->v_mount); 944 tdnode = VP_TO_TMPFS_DIR(tdvp); 945 946 /* If source and target are the same file, there is nothing to do. */ 947 if (fvp == tvp) { 948 error = 0; 949 goto out; 950 } 951 952 /* If we need to move the directory between entries, lock the 953 * source so that we can safely operate on it. */ 954 if (tdvp != fdvp) { 955 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 956 if (error != 0) 957 goto out; 958 } 959 fdnode = VP_TO_TMPFS_DIR(fdvp); 960 fnode = VP_TO_TMPFS_NODE(fvp); 961 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 962 963 /* Avoid manipulating '.' and '..' entries. */ 964 if (de == NULL) { 965 MPASS(fvp->v_type == VDIR); 966 error = EINVAL; 967 goto out_locked; 968 } 969 MPASS(de->td_node == fnode); 970 971 /* If re-naming a directory to another preexisting directory 972 * ensure that the target directory is empty so that its 973 * removal causes no side effects. 974 * Kern_rename gurantees the destination to be a directory 975 * if the source is one. */ 976 if (tvp != NULL) { 977 MPASS(tnode != NULL); 978 979 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 980 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 981 error = EPERM; 982 goto out_locked; 983 } 984 985 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 986 if (tnode->tn_size > 0) { 987 error = ENOTEMPTY; 988 goto out_locked; 989 } 990 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 991 error = ENOTDIR; 992 goto out_locked; 993 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 994 error = EISDIR; 995 goto out_locked; 996 } else { 997 MPASS(fnode->tn_type != VDIR && 998 tnode->tn_type != VDIR); 999 } 1000 } 1001 1002 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1003 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1004 error = EPERM; 1005 goto out_locked; 1006 } 1007 1008 /* Ensure that we have enough memory to hold the new name, if it 1009 * has to be changed. */ 1010 if (fcnp->cn_namelen != tcnp->cn_namelen || 1011 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1012 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1013 } else 1014 newname = NULL; 1015 1016 /* If the node is being moved to another directory, we have to do 1017 * the move. */ 1018 if (fdnode != tdnode) { 1019 /* In case we are moving a directory, we have to adjust its 1020 * parent to point to the new parent. */ 1021 if (de->td_node->tn_type == VDIR) { 1022 struct tmpfs_node *n; 1023 1024 /* Ensure the target directory is not a child of the 1025 * directory being moved. Otherwise, we'd end up 1026 * with stale nodes. */ 1027 n = tdnode; 1028 /* TMPFS_LOCK garanties that no nodes are freed while 1029 * traversing the list. Nodes can only be marked as 1030 * removed: tn_parent == NULL. */ 1031 TMPFS_LOCK(tmp); 1032 TMPFS_NODE_LOCK(n); 1033 while (n != n->tn_dir.tn_parent) { 1034 struct tmpfs_node *parent; 1035 1036 if (n == fnode) { 1037 TMPFS_NODE_UNLOCK(n); 1038 TMPFS_UNLOCK(tmp); 1039 error = EINVAL; 1040 if (newname != NULL) 1041 free(newname, M_TMPFSNAME); 1042 goto out_locked; 1043 } 1044 parent = n->tn_dir.tn_parent; 1045 TMPFS_NODE_UNLOCK(n); 1046 if (parent == NULL) { 1047 n = NULL; 1048 break; 1049 } 1050 TMPFS_NODE_LOCK(parent); 1051 if (parent->tn_dir.tn_parent == NULL) { 1052 TMPFS_NODE_UNLOCK(parent); 1053 n = NULL; 1054 break; 1055 } 1056 n = parent; 1057 } 1058 TMPFS_UNLOCK(tmp); 1059 if (n == NULL) { 1060 error = EINVAL; 1061 if (newname != NULL) 1062 free(newname, M_TMPFSNAME); 1063 goto out_locked; 1064 } 1065 TMPFS_NODE_UNLOCK(n); 1066 1067 /* Adjust the parent pointer. */ 1068 TMPFS_VALIDATE_DIR(fnode); 1069 TMPFS_NODE_LOCK(de->td_node); 1070 de->td_node->tn_dir.tn_parent = tdnode; 1071 TMPFS_NODE_UNLOCK(de->td_node); 1072 1073 /* As a result of changing the target of the '..' 1074 * entry, the link count of the source and target 1075 * directories has to be adjusted. */ 1076 TMPFS_NODE_LOCK(tdnode); 1077 TMPFS_ASSERT_LOCKED(tdnode); 1078 tdnode->tn_links++; 1079 TMPFS_NODE_UNLOCK(tdnode); 1080 1081 TMPFS_NODE_LOCK(fdnode); 1082 TMPFS_ASSERT_LOCKED(fdnode); 1083 fdnode->tn_links--; 1084 TMPFS_NODE_UNLOCK(fdnode); 1085 } 1086 1087 /* Do the move: just remove the entry from the source directory 1088 * and insert it into the target one. */ 1089 tmpfs_dir_detach(fdvp, de); 1090 tmpfs_dir_attach(tdvp, de); 1091 } 1092 1093 /* If the name has changed, we need to make it effective by changing 1094 * it in the directory entry. */ 1095 if (newname != NULL) { 1096 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1097 1098 free(de->td_name, M_TMPFSNAME); 1099 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1100 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1101 de->td_name = newname; 1102 1103 fnode->tn_status |= TMPFS_NODE_CHANGED; 1104 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1105 } 1106 1107 /* If we are overwriting an entry, we have to remove the old one 1108 * from the target directory. */ 1109 if (tvp != NULL) { 1110 /* Remove the old entry from the target directory. */ 1111 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1112 tmpfs_dir_detach(tdvp, de); 1113 1114 /* Free the directory entry we just deleted. Note that the 1115 * node referred by it will not be removed until the vnode is 1116 * really reclaimed. */ 1117 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1118 } 1119 1120 error = 0; 1121 1122out_locked: 1123 if (fdnode != tdnode) 1124 VOP_UNLOCK(fdvp, 0); 1125 1126out: 1127 /* Release target nodes. */ 1128 /* XXX: I don't understand when tdvp can be the same as tvp, but 1129 * other code takes care of this... */ 1130 if (tdvp == tvp) 1131 vrele(tdvp); 1132 else 1133 vput(tdvp); 1134 if (tvp != NULL) 1135 vput(tvp); 1136 1137 /* Release source nodes. */ 1138 vrele(fdvp); 1139 vrele(fvp); 1140 1141 return error; 1142} 1143 1144/* --------------------------------------------------------------------- */ 1145 1146static int 1147tmpfs_mkdir(struct vop_mkdir_args *v) 1148{ 1149 struct vnode *dvp = v->a_dvp; 1150 struct vnode **vpp = v->a_vpp; 1151 struct componentname *cnp = v->a_cnp; 1152 struct vattr *vap = v->a_vap; 1153 1154 MPASS(vap->va_type == VDIR); 1155 1156 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1157} 1158 1159/* --------------------------------------------------------------------- */ 1160 1161static int 1162tmpfs_rmdir(struct vop_rmdir_args *v) 1163{ 1164 struct vnode *dvp = v->a_dvp; 1165 struct vnode *vp = v->a_vp; 1166 1167 int error; 1168 struct tmpfs_dirent *de; 1169 struct tmpfs_mount *tmp; 1170 struct tmpfs_node *dnode; 1171 struct tmpfs_node *node; 1172 1173 MPASS(VOP_ISLOCKED(dvp)); 1174 MPASS(VOP_ISLOCKED(vp)); 1175 1176 tmp = VFS_TO_TMPFS(dvp->v_mount); 1177 dnode = VP_TO_TMPFS_DIR(dvp); 1178 node = VP_TO_TMPFS_DIR(vp); 1179 1180 /* Directories with more than two entries ('.' and '..') cannot be 1181 * removed. */ 1182 if (node->tn_size > 0) { 1183 error = ENOTEMPTY; 1184 goto out; 1185 } 1186 1187 if ((dnode->tn_flags & APPEND) 1188 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1189 error = EPERM; 1190 goto out; 1191 } 1192 1193 /* This invariant holds only if we are not trying to remove "..". 1194 * We checked for that above so this is safe now. */ 1195 MPASS(node->tn_dir.tn_parent == dnode); 1196 1197 /* Get the directory entry associated with node (vp). This was 1198 * filled by tmpfs_lookup while looking up the entry. */ 1199 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1200 MPASS(TMPFS_DIRENT_MATCHES(de, 1201 v->a_cnp->cn_nameptr, 1202 v->a_cnp->cn_namelen)); 1203 1204 /* Check flags to see if we are allowed to remove the directory. */ 1205 if (dnode->tn_flags & APPEND 1206 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1207 error = EPERM; 1208 goto out; 1209 } 1210 1211 1212 /* Detach the directory entry from the directory (dnode). */ 1213 tmpfs_dir_detach(dvp, de); 1214 1215 /* No vnode should be allocated for this entry from this point */ 1216 TMPFS_NODE_LOCK(node); 1217 TMPFS_ASSERT_ELOCKED(node); 1218 node->tn_links--; 1219 node->tn_dir.tn_parent = NULL; 1220 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1221 TMPFS_NODE_MODIFIED; 1222 1223 TMPFS_NODE_UNLOCK(node); 1224 1225 TMPFS_NODE_LOCK(dnode); 1226 TMPFS_ASSERT_ELOCKED(dnode); 1227 dnode->tn_links--; 1228 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1229 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1230 TMPFS_NODE_UNLOCK(dnode); 1231 1232 cache_purge(dvp); 1233 cache_purge(vp); 1234 1235 /* Free the directory entry we just deleted. Note that the node 1236 * referred by it will not be removed until the vnode is really 1237 * reclaimed. */ 1238 tmpfs_free_dirent(tmp, de, TRUE); 1239 1240 /* Release the deleted vnode (will destroy the node, notify 1241 * interested parties and clean it from the cache). */ 1242 1243 dnode->tn_status |= TMPFS_NODE_CHANGED; 1244 tmpfs_update(dvp); 1245 1246 error = 0; 1247 1248out: 1249 return error; 1250} 1251 1252/* --------------------------------------------------------------------- */ 1253 1254static int 1255tmpfs_symlink(struct vop_symlink_args *v) 1256{ 1257 struct vnode *dvp = v->a_dvp; 1258 struct vnode **vpp = v->a_vpp; 1259 struct componentname *cnp = v->a_cnp; 1260 struct vattr *vap = v->a_vap; 1261 char *target = v->a_target; 1262 1263#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1264 MPASS(vap->va_type == VLNK); 1265#else 1266 vap->va_type = VLNK; 1267#endif 1268 1269 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1270} 1271 1272/* --------------------------------------------------------------------- */ 1273 1274static int 1275tmpfs_readdir(struct vop_readdir_args *v) 1276{ 1277 struct vnode *vp = v->a_vp; 1278 struct uio *uio = v->a_uio; 1279 int *eofflag = v->a_eofflag; 1280 u_long **cookies = v->a_cookies; 1281 int *ncookies = v->a_ncookies; 1282 1283 int error; 1284 off_t startoff; 1285 off_t cnt = 0; 1286 struct tmpfs_node *node; 1287 1288 /* This operation only makes sense on directory nodes. */ 1289 if (vp->v_type != VDIR) 1290 return ENOTDIR; 1291 1292 node = VP_TO_TMPFS_DIR(vp); 1293 1294 startoff = uio->uio_offset; 1295 1296 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1297 error = tmpfs_dir_getdotdent(node, uio); 1298 if (error != 0) 1299 goto outok; 1300 cnt++; 1301 } 1302 1303 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1304 error = tmpfs_dir_getdotdotdent(node, uio); 1305 if (error != 0) 1306 goto outok; 1307 cnt++; 1308 } 1309 1310 error = tmpfs_dir_getdents(node, uio, &cnt); 1311 1312outok: 1313 MPASS(error >= -1); 1314 1315 if (error == -1) 1316 error = 0; 1317 1318 if (eofflag != NULL) 1319 *eofflag = 1320 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1321 1322 /* Update NFS-related variables. */ 1323 if (error == 0 && cookies != NULL && ncookies != NULL) { 1324 off_t i; 1325 off_t off = startoff; 1326 struct tmpfs_dirent *de = NULL; 1327 1328 *ncookies = cnt; 1329 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1330 1331 for (i = 0; i < cnt; i++) { 1332 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1333 if (off == TMPFS_DIRCOOKIE_DOT) { 1334 off = TMPFS_DIRCOOKIE_DOTDOT; 1335 } else { 1336 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1337 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1338 } else if (de != NULL) { 1339 de = TAILQ_NEXT(de, td_entries); 1340 } else { 1341 de = tmpfs_dir_lookupbycookie(node, 1342 off); 1343 MPASS(de != NULL); 1344 de = TAILQ_NEXT(de, td_entries); 1345 } 1346 if (de == NULL) 1347 off = TMPFS_DIRCOOKIE_EOF; 1348 else 1349 off = tmpfs_dircookie(de); 1350 } 1351 1352 (*cookies)[i] = off; 1353 } 1354 MPASS(uio->uio_offset == off); 1355 } 1356 1357 return error; 1358} 1359 1360/* --------------------------------------------------------------------- */ 1361 1362static int 1363tmpfs_readlink(struct vop_readlink_args *v) 1364{ 1365 struct vnode *vp = v->a_vp; 1366 struct uio *uio = v->a_uio; 1367 1368 int error; 1369 struct tmpfs_node *node; 1370 1371 MPASS(uio->uio_offset == 0); 1372 MPASS(vp->v_type == VLNK); 1373 1374 node = VP_TO_TMPFS_NODE(vp); 1375 1376 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1377 uio); 1378 node->tn_status |= TMPFS_NODE_ACCESSED; 1379 1380 return error; 1381} 1382 1383/* --------------------------------------------------------------------- */ 1384 1385static int 1386tmpfs_inactive(struct vop_inactive_args *v) 1387{ 1388 struct vnode *vp = v->a_vp; 1389 struct thread *l = v->a_td; 1390 1391 struct tmpfs_node *node; 1392 1393 MPASS(VOP_ISLOCKED(vp)); 1394 1395 node = VP_TO_TMPFS_NODE(vp); 1396 1397 if (node->tn_links == 0) 1398 vrecycle(vp, l); 1399 1400 return 0; 1401} 1402 1403/* --------------------------------------------------------------------- */ 1404 1405int 1406tmpfs_reclaim(struct vop_reclaim_args *v) 1407{ 1408 struct vnode *vp = v->a_vp; 1409 1410 struct tmpfs_mount *tmp; 1411 struct tmpfs_node *node; 1412 1413 node = VP_TO_TMPFS_NODE(vp); 1414 tmp = VFS_TO_TMPFS(vp->v_mount); 1415 1416 vnode_destroy_vobject(vp); 1417 cache_purge(vp); 1418 1419 TMPFS_NODE_LOCK(node); 1420 TMPFS_ASSERT_ELOCKED(node); 1421 tmpfs_free_vp(vp); 1422 1423 /* If the node referenced by this vnode was deleted by the user, 1424 * we must free its associated data structures (now that the vnode 1425 * is being reclaimed). */ 1426 if (node->tn_links == 0 && 1427 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1428 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1429 TMPFS_NODE_UNLOCK(node); 1430 tmpfs_free_node(tmp, node); 1431 } else 1432 TMPFS_NODE_UNLOCK(node); 1433 1434 MPASS(vp->v_data == NULL); 1435 return 0; 1436} 1437 1438/* --------------------------------------------------------------------- */ 1439 1440static int 1441tmpfs_print(struct vop_print_args *v) 1442{ 1443 struct vnode *vp = v->a_vp; 1444 1445 struct tmpfs_node *node; 1446 1447 node = VP_TO_TMPFS_NODE(vp); 1448 1449 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1450 node, node->tn_flags, node->tn_links); 1451 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1452 ", status 0x%x\n", 1453 node->tn_mode, node->tn_uid, node->tn_gid, 1454 (uintmax_t)node->tn_size, node->tn_status); 1455 1456 if (vp->v_type == VFIFO) 1457 fifo_printinfo(vp); 1458 1459 printf("\n"); 1460 1461 return 0; 1462} 1463 1464/* --------------------------------------------------------------------- */ 1465 1466static int 1467tmpfs_pathconf(struct vop_pathconf_args *v) 1468{ 1469 int name = v->a_name; 1470 register_t *retval = v->a_retval; 1471 1472 int error; 1473 1474 error = 0; 1475 1476 switch (name) { 1477 case _PC_LINK_MAX: 1478 *retval = LINK_MAX; 1479 break; 1480 1481 case _PC_NAME_MAX: 1482 *retval = NAME_MAX; 1483 break; 1484 1485 case _PC_PATH_MAX: 1486 *retval = PATH_MAX; 1487 break; 1488 1489 case _PC_PIPE_BUF: 1490 *retval = PIPE_BUF; 1491 break; 1492 1493 case _PC_CHOWN_RESTRICTED: 1494 *retval = 1; 1495 break; 1496 1497 case _PC_NO_TRUNC: 1498 *retval = 1; 1499 break; 1500 1501 case _PC_SYNC_IO: 1502 *retval = 1; 1503 break; 1504 1505 case _PC_FILESIZEBITS: 1506 *retval = 0; /* XXX Don't know which value should I return. */ 1507 break; 1508 1509 default: 1510 error = EINVAL; 1511 } 1512 1513 return error; 1514} 1515 1516static int 1517tmpfs_vptofh(struct vop_vptofh_args *ap) 1518{ 1519 struct tmpfs_fid *tfhp; 1520 struct tmpfs_node *node; 1521 1522 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1523 node = VP_TO_TMPFS_NODE(ap->a_vp); 1524 1525 tfhp->tf_len = sizeof(struct tmpfs_fid); 1526 tfhp->tf_id = node->tn_id; 1527 tfhp->tf_gen = node->tn_gen; 1528 1529 return (0); 1530} 1531 1532/* --------------------------------------------------------------------- */ 1533 1534/* 1535 * vnode operations vector used for files stored in a tmpfs file system. 1536 */ 1537struct vop_vector tmpfs_vnodeop_entries = { 1538 .vop_default = &default_vnodeops, 1539 .vop_lookup = vfs_cache_lookup, 1540 .vop_cachedlookup = tmpfs_lookup, 1541 .vop_create = tmpfs_create, 1542 .vop_mknod = tmpfs_mknod, 1543 .vop_open = tmpfs_open, 1544 .vop_close = tmpfs_close, 1545 .vop_access = tmpfs_access, 1546 .vop_getattr = tmpfs_getattr, 1547 .vop_setattr = tmpfs_setattr, 1548 .vop_read = tmpfs_read, 1549 .vop_write = tmpfs_write, 1550 .vop_fsync = tmpfs_fsync, 1551 .vop_remove = tmpfs_remove, 1552 .vop_link = tmpfs_link, 1553 .vop_rename = tmpfs_rename, 1554 .vop_mkdir = tmpfs_mkdir, 1555 .vop_rmdir = tmpfs_rmdir, 1556 .vop_symlink = tmpfs_symlink, 1557 .vop_readdir = tmpfs_readdir, 1558 .vop_readlink = tmpfs_readlink, 1559 .vop_inactive = tmpfs_inactive, 1560 .vop_reclaim = tmpfs_reclaim, 1561 .vop_print = tmpfs_print, 1562 .vop_pathconf = tmpfs_pathconf, 1563 .vop_vptofh = tmpfs_vptofh, 1564 .vop_bmap = VOP_EOPNOTSUPP, 1565}; 1566 1567