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("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/fcntl.h> 41 #include <sys/lockf.h> 42 #include <sys/lock.h> 43 #include <sys/namei.h> 44 #include <sys/priv.h> 45 #include <sys/proc.h> 46 #include <sys/rwlock.h> 47 #include <sys/sched.h> 48 #include <sys/sf_buf.h> 49 #include <sys/stat.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_param.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_pager.h> 60 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 SYSCTL_DECL(_vfs_tmpfs); 65 66 static volatile int tmpfs_rename_restarts; 67 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69 "Times rename had to restart due to lock contention"); 70 71 /* --------------------------------------------------------------------- */ 72 73 static int 74 tmpfs_lookup(struct vop_cachedlookup_args *v) 75 { 76 struct vnode *dvp = v->a_dvp; 77 struct vnode **vpp = v->a_vpp; 78 struct componentname *cnp = v->a_cnp; 79 80 int error; 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode; 83 84 dnode = VP_TO_TMPFS_DIR(dvp); 85 *vpp = NULLVP; 86 87 /* Check accessibility of requested node as a first step. */ 88 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 89 if (error != 0) 90 goto out; 91 92 /* We cannot be requesting the parent directory of the root node. */ 93 MPASS(IMPLIES(dnode->tn_type == VDIR && 94 dnode->tn_dir.tn_parent == dnode, 95 !(cnp->cn_flags & ISDOTDOT))); 96 97 TMPFS_ASSERT_LOCKED(dnode); 98 if (dnode->tn_dir.tn_parent == NULL) { 99 error = ENOENT; 100 goto out; 101 } 102 if (cnp->cn_flags & ISDOTDOT) { 103 int ltype = 0; 104 105 ltype = VOP_ISLOCKED(dvp); 106 vhold(dvp); 107 VOP_UNLOCK(dvp, 0); 108 /* Allocate a new vnode on the matching entry. */ 109 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 110 cnp->cn_lkflags, vpp); 111 112 vn_lock(dvp, ltype | LK_RETRY); 113 vdrop(dvp); 114 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115 VREF(dvp); 116 *vpp = dvp; 117 error = 0; 118 } else { 119 de = tmpfs_dir_lookup(dnode, NULL, cnp); 120 if (de != NULL && de->td_node == NULL) 121 cnp->cn_flags |= ISWHITEOUT; 122 if (de == NULL || de->td_node == NULL) { 123 /* The entry was not found in the directory. 124 * This is OK if we are creating or renaming an 125 * entry and are working on the last component of 126 * the path name. */ 127 if ((cnp->cn_flags & ISLASTCN) && 128 (cnp->cn_nameiop == CREATE || \ 129 cnp->cn_nameiop == RENAME || 130 (cnp->cn_nameiop == DELETE && 131 cnp->cn_flags & DOWHITEOUT && 132 cnp->cn_flags & ISWHITEOUT))) { 133 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134 cnp->cn_thread); 135 if (error != 0) 136 goto out; 137 138 /* Keep the component name in the buffer for 139 * future uses. */ 140 cnp->cn_flags |= SAVENAME; 141 142 error = EJUSTRETURN; 143 } else 144 error = ENOENT; 145 } else { 146 struct tmpfs_node *tnode; 147 148 /* The entry was found, so get its associated 149 * tmpfs_node. */ 150 tnode = de->td_node; 151 152 /* If we are not at the last path component and 153 * found a non-directory or non-link entry (which 154 * may itself be pointing to a directory), raise 155 * an error. */ 156 if ((tnode->tn_type != VDIR && 157 tnode->tn_type != VLNK) && 158 !(cnp->cn_flags & ISLASTCN)) { 159 error = ENOTDIR; 160 goto out; 161 } 162 163 /* If we are deleting or renaming the entry, keep 164 * track of its tmpfs_dirent so that it can be 165 * easily deleted later. */ 166 if ((cnp->cn_flags & ISLASTCN) && 167 (cnp->cn_nameiop == DELETE || 168 cnp->cn_nameiop == RENAME)) { 169 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 170 cnp->cn_thread); 171 if (error != 0) 172 goto out; 173 174 /* Allocate a new vnode on the matching entry. */ 175 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 176 cnp->cn_lkflags, vpp); 177 if (error != 0) 178 goto out; 179 180 if ((dnode->tn_mode & S_ISTXT) && 181 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 182 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 183 error = EPERM; 184 vput(*vpp); 185 *vpp = NULL; 186 goto out; 187 } 188 cnp->cn_flags |= SAVENAME; 189 } else { 190 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 191 cnp->cn_lkflags, vpp); 192 } 193 } 194 } 195 196 /* Store the result of this lookup in the cache. Avoid this if the 197 * request was for creation, as it does not improve timings on 198 * emprical tests. */ 199 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200 cache_enter(dvp, *vpp, cnp); 201 202 out: 203 /* If there were no errors, *vpp cannot be null and it must be 204 * locked. */ 205 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206 207 return error; 208 } 209 210 /* --------------------------------------------------------------------- */ 211 212 static int 213 tmpfs_create(struct vop_create_args *v) 214 { 215 struct vnode *dvp = v->a_dvp; 216 struct vnode **vpp = v->a_vpp; 217 struct componentname *cnp = v->a_cnp; 218 struct vattr *vap = v->a_vap; 219 220 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 221 222 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 223 } 224 /* --------------------------------------------------------------------- */ 225 226 static int 227 tmpfs_mknod(struct vop_mknod_args *v) 228 { 229 struct vnode *dvp = v->a_dvp; 230 struct vnode **vpp = v->a_vpp; 231 struct componentname *cnp = v->a_cnp; 232 struct vattr *vap = v->a_vap; 233 234 if (vap->va_type != VBLK && vap->va_type != VCHR && 235 vap->va_type != VFIFO) 236 return EINVAL; 237 238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 239 } 240 241 /* --------------------------------------------------------------------- */ 242 243 static int 244 tmpfs_open(struct vop_open_args *v) 245 { 246 struct vnode *vp = v->a_vp; 247 int mode = v->a_mode; 248 249 int error; 250 struct tmpfs_node *node; 251 252 MPASS(VOP_ISLOCKED(vp)); 253 254 node = VP_TO_TMPFS_NODE(vp); 255 256 /* The file is still active but all its names have been removed 257 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 258 * it is about to die. */ 259 if (node->tn_links < 1) 260 return (ENOENT); 261 262 /* If the file is marked append-only, deny write requests. */ 263 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 264 error = EPERM; 265 else { 266 error = 0; 267 vnode_create_vobject(vp, node->tn_size, v->a_td); 268 } 269 270 MPASS(VOP_ISLOCKED(vp)); 271 return error; 272 } 273 274 /* --------------------------------------------------------------------- */ 275 276 static int 277 tmpfs_close(struct vop_close_args *v) 278 { 279 struct vnode *vp = v->a_vp; 280 281 MPASS(VOP_ISLOCKED(vp)); 282 283 /* Update node times. */ 284 tmpfs_update(vp); 285 286 return (0); 287 } 288 289 /* --------------------------------------------------------------------- */ 290 291 int 292 tmpfs_access(struct vop_access_args *v) 293 { 294 struct vnode *vp = v->a_vp; 295 accmode_t accmode = v->a_accmode; 296 struct ucred *cred = v->a_cred; 297 298 int error; 299 struct tmpfs_node *node; 300 301 MPASS(VOP_ISLOCKED(vp)); 302 303 node = VP_TO_TMPFS_NODE(vp); 304 305 switch (vp->v_type) { 306 case VDIR: 307 /* FALLTHROUGH */ 308 case VLNK: 309 /* FALLTHROUGH */ 310 case VREG: 311 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 312 error = EROFS; 313 goto out; 314 } 315 break; 316 317 case VBLK: 318 /* FALLTHROUGH */ 319 case VCHR: 320 /* FALLTHROUGH */ 321 case VSOCK: 322 /* FALLTHROUGH */ 323 case VFIFO: 324 break; 325 326 default: 327 error = EINVAL; 328 goto out; 329 } 330 331 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 332 error = EPERM; 333 goto out; 334 } 335 336 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 337 node->tn_gid, accmode, cred, NULL); 338 339 out: 340 MPASS(VOP_ISLOCKED(vp)); 341 342 return error; 343 } 344 345 /* --------------------------------------------------------------------- */ 346 347 int 348 tmpfs_getattr(struct vop_getattr_args *v) 349 { 350 struct vnode *vp = v->a_vp; 351 struct vattr *vap = v->a_vap; 352 353 struct tmpfs_node *node; 354 355 node = VP_TO_TMPFS_NODE(vp); 356 357 tmpfs_update(vp); 358 359 vap->va_type = vp->v_type; 360 vap->va_mode = node->tn_mode; 361 vap->va_nlink = node->tn_links; 362 vap->va_uid = node->tn_uid; 363 vap->va_gid = node->tn_gid; 364 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 365 vap->va_fileid = node->tn_id; 366 vap->va_size = node->tn_size; 367 vap->va_blocksize = PAGE_SIZE; 368 vap->va_atime = node->tn_atime; 369 vap->va_mtime = node->tn_mtime; 370 vap->va_ctime = node->tn_ctime; 371 vap->va_birthtime = node->tn_birthtime; 372 vap->va_gen = node->tn_gen; 373 vap->va_flags = node->tn_flags; 374 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 375 node->tn_rdev : NODEV; 376 vap->va_bytes = round_page(node->tn_size); 377 vap->va_filerev = 0; 378 379 return 0; 380 } 381 382 /* --------------------------------------------------------------------- */ 383 384 /* XXX Should this operation be atomic? I think it should, but code in 385 * XXX other places (e.g., ufs) doesn't seem to be... */ 386 int 387 tmpfs_setattr(struct vop_setattr_args *v) 388 { 389 struct vnode *vp = v->a_vp; 390 struct vattr *vap = v->a_vap; 391 struct ucred *cred = v->a_cred; 392 struct thread *td = curthread; 393 394 int error; 395 396 MPASS(VOP_ISLOCKED(vp)); 397 398 error = 0; 399 400 /* Abort if any unsettable attribute is given. */ 401 if (vap->va_type != VNON || 402 vap->va_nlink != VNOVAL || 403 vap->va_fsid != VNOVAL || 404 vap->va_fileid != VNOVAL || 405 vap->va_blocksize != VNOVAL || 406 vap->va_gen != VNOVAL || 407 vap->va_rdev != VNOVAL || 408 vap->va_bytes != VNOVAL) 409 error = EINVAL; 410 411 if (error == 0 && (vap->va_flags != VNOVAL)) 412 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 413 414 if (error == 0 && (vap->va_size != VNOVAL)) 415 error = tmpfs_chsize(vp, vap->va_size, cred, td); 416 417 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 418 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 419 420 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 421 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 422 423 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 424 vap->va_atime.tv_nsec != VNOVAL) || 425 (vap->va_mtime.tv_sec != VNOVAL && 426 vap->va_mtime.tv_nsec != VNOVAL) || 427 (vap->va_birthtime.tv_sec != VNOVAL && 428 vap->va_birthtime.tv_nsec != VNOVAL))) 429 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 430 &vap->va_birthtime, vap->va_vaflags, cred, td); 431 432 /* Update the node times. We give preference to the error codes 433 * generated by this function rather than the ones that may arise 434 * from tmpfs_update. */ 435 tmpfs_update(vp); 436 437 MPASS(VOP_ISLOCKED(vp)); 438 439 return error; 440 } 441 442 /* --------------------------------------------------------------------- */ 443 static int 444 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 445 vm_offset_t offset, size_t tlen, struct uio *uio) 446 { 447 vm_page_t m; 448 int error, rv; 449 450 VM_OBJECT_WLOCK(tobj); 451 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 452 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 453 if (m->valid != VM_PAGE_BITS_ALL) { 454 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 455 rv = vm_pager_get_pages(tobj, &m, 1, 0); 456 if (rv != VM_PAGER_OK) { 457 vm_page_lock(m); 458 vm_page_free(m); 459 vm_page_unlock(m); 460 VM_OBJECT_WUNLOCK(tobj); 461 return (EIO); 462 } 463 } else 464 vm_page_zero_invalid(m, TRUE); 465 } 466 VM_OBJECT_WUNLOCK(tobj); 467 error = uiomove_fromphys(&m, offset, tlen, uio); 468 VM_OBJECT_WLOCK(tobj); 469 vm_page_lock(m); 470 vm_page_unwire(m, TRUE); 471 vm_page_unlock(m); 472 vm_page_wakeup(m); 473 VM_OBJECT_WUNLOCK(tobj); 474 475 return (error); 476 } 477 478 static __inline int 479 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 480 vm_offset_t offset, size_t tlen, void *buf) 481 { 482 struct uio uio; 483 struct iovec iov; 484 485 uio.uio_iovcnt = 1; 486 uio.uio_iov = &iov; 487 iov.iov_base = buf; 488 iov.iov_len = tlen; 489 490 uio.uio_offset = 0; 491 uio.uio_resid = tlen; 492 uio.uio_rw = UIO_READ; 493 uio.uio_segflg = UIO_SYSSPACE; 494 uio.uio_td = curthread; 495 496 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 497 } 498 499 static int 500 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 501 { 502 struct sf_buf *sf; 503 vm_pindex_t idx; 504 vm_page_t m; 505 vm_offset_t offset; 506 off_t addr; 507 size_t tlen; 508 char *ma; 509 int error; 510 511 addr = uio->uio_offset; 512 idx = OFF_TO_IDX(addr); 513 offset = addr & PAGE_MASK; 514 tlen = MIN(PAGE_SIZE - offset, len); 515 516 VM_OBJECT_WLOCK(vobj); 517 lookupvpg: 518 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 519 vm_page_is_valid(m, offset, tlen)) { 520 if ((m->oflags & VPO_BUSY) != 0) { 521 /* 522 * Reference the page before unlocking and sleeping so 523 * that the page daemon is less likely to reclaim it. 524 */ 525 vm_page_reference(m); 526 vm_page_sleep(m, "tmfsmr"); 527 goto lookupvpg; 528 } 529 vm_page_busy(m); 530 VM_OBJECT_WUNLOCK(vobj); 531 error = uiomove_fromphys(&m, offset, tlen, uio); 532 VM_OBJECT_WLOCK(vobj); 533 vm_page_wakeup(m); 534 VM_OBJECT_WUNLOCK(vobj); 535 return (error); 536 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 537 KASSERT(offset == 0, 538 ("unexpected offset in tmpfs_mappedread for sendfile")); 539 if ((m->oflags & VPO_BUSY) != 0) { 540 /* 541 * Reference the page before unlocking and sleeping so 542 * that the page daemon is less likely to reclaim it. 543 */ 544 vm_page_reference(m); 545 vm_page_sleep(m, "tmfsmr"); 546 goto lookupvpg; 547 } 548 vm_page_busy(m); 549 VM_OBJECT_WUNLOCK(vobj); 550 sched_pin(); 551 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 552 ma = (char *)sf_buf_kva(sf); 553 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 554 if (error == 0) { 555 if (tlen != PAGE_SIZE) 556 bzero(ma + tlen, PAGE_SIZE - tlen); 557 uio->uio_offset += tlen; 558 uio->uio_resid -= tlen; 559 } 560 sf_buf_free(sf); 561 sched_unpin(); 562 VM_OBJECT_WLOCK(vobj); 563 if (error == 0) 564 m->valid = VM_PAGE_BITS_ALL; 565 vm_page_wakeup(m); 566 VM_OBJECT_WUNLOCK(vobj); 567 return (error); 568 } 569 VM_OBJECT_WUNLOCK(vobj); 570 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 571 572 return (error); 573 } 574 575 static int 576 tmpfs_read(struct vop_read_args *v) 577 { 578 struct vnode *vp = v->a_vp; 579 struct uio *uio = v->a_uio; 580 581 struct tmpfs_node *node; 582 vm_object_t uobj; 583 size_t len; 584 int resid; 585 586 int error = 0; 587 588 node = VP_TO_TMPFS_NODE(vp); 589 590 if (vp->v_type != VREG) { 591 error = EISDIR; 592 goto out; 593 } 594 595 if (uio->uio_offset < 0) { 596 error = EINVAL; 597 goto out; 598 } 599 600 node->tn_status |= TMPFS_NODE_ACCESSED; 601 602 uobj = node->tn_reg.tn_aobj; 603 while ((resid = uio->uio_resid) > 0) { 604 error = 0; 605 if (node->tn_size <= uio->uio_offset) 606 break; 607 len = MIN(node->tn_size - uio->uio_offset, resid); 608 if (len == 0) 609 break; 610 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 611 if ((error != 0) || (resid == uio->uio_resid)) 612 break; 613 } 614 615 out: 616 617 return error; 618 } 619 620 /* --------------------------------------------------------------------- */ 621 622 static int 623 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 624 { 625 vm_pindex_t idx; 626 vm_page_t vpg, tpg; 627 vm_offset_t offset; 628 off_t addr; 629 size_t tlen; 630 int error, rv; 631 632 error = 0; 633 634 addr = uio->uio_offset; 635 idx = OFF_TO_IDX(addr); 636 offset = addr & PAGE_MASK; 637 tlen = MIN(PAGE_SIZE - offset, len); 638 639 VM_OBJECT_WLOCK(vobj); 640 lookupvpg: 641 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 642 vm_page_is_valid(vpg, offset, tlen)) { 643 if ((vpg->oflags & VPO_BUSY) != 0) { 644 /* 645 * Reference the page before unlocking and sleeping so 646 * that the page daemon is less likely to reclaim it. 647 */ 648 vm_page_reference(vpg); 649 vm_page_sleep(vpg, "tmfsmw"); 650 goto lookupvpg; 651 } 652 vm_page_busy(vpg); 653 vm_page_undirty(vpg); 654 VM_OBJECT_WUNLOCK(vobj); 655 error = uiomove_fromphys(&vpg, offset, tlen, uio); 656 } else { 657 if (vm_page_is_cached(vobj, idx)) 658 vm_page_cache_free(vobj, idx, idx + 1); 659 VM_OBJECT_WUNLOCK(vobj); 660 vpg = NULL; 661 } 662 VM_OBJECT_WLOCK(tobj); 663 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 664 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 665 if (tpg->valid != VM_PAGE_BITS_ALL) { 666 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 667 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 668 if (rv != VM_PAGER_OK) { 669 vm_page_lock(tpg); 670 vm_page_free(tpg); 671 vm_page_unlock(tpg); 672 error = EIO; 673 goto out; 674 } 675 } else 676 vm_page_zero_invalid(tpg, TRUE); 677 } 678 VM_OBJECT_WUNLOCK(tobj); 679 if (vpg == NULL) 680 error = uiomove_fromphys(&tpg, offset, tlen, uio); 681 else { 682 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 683 pmap_copy_page(vpg, tpg); 684 } 685 VM_OBJECT_WLOCK(tobj); 686 if (error == 0) { 687 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 688 ("parts of tpg invalid")); 689 vm_page_dirty(tpg); 690 } 691 vm_page_lock(tpg); 692 vm_page_unwire(tpg, TRUE); 693 vm_page_unlock(tpg); 694 vm_page_wakeup(tpg); 695 out: 696 VM_OBJECT_WUNLOCK(tobj); 697 if (vpg != NULL) { 698 VM_OBJECT_WLOCK(vobj); 699 vm_page_wakeup(vpg); 700 VM_OBJECT_WUNLOCK(vobj); 701 } 702 703 return (error); 704 } 705 706 static int 707 tmpfs_write(struct vop_write_args *v) 708 { 709 struct vnode *vp = v->a_vp; 710 struct uio *uio = v->a_uio; 711 int ioflag = v->a_ioflag; 712 713 boolean_t extended; 714 int error = 0; 715 off_t oldsize; 716 struct tmpfs_node *node; 717 vm_object_t uobj; 718 size_t len; 719 int resid; 720 721 node = VP_TO_TMPFS_NODE(vp); 722 oldsize = node->tn_size; 723 724 if (uio->uio_offset < 0 || vp->v_type != VREG) { 725 error = EINVAL; 726 goto out; 727 } 728 729 if (uio->uio_resid == 0) { 730 error = 0; 731 goto out; 732 } 733 734 if (ioflag & IO_APPEND) 735 uio->uio_offset = node->tn_size; 736 737 if (uio->uio_offset + uio->uio_resid > 738 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 739 return (EFBIG); 740 741 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 742 return (EFBIG); 743 744 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 745 if (extended) { 746 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 747 FALSE); 748 if (error != 0) 749 goto out; 750 } 751 752 uobj = node->tn_reg.tn_aobj; 753 while ((resid = uio->uio_resid) > 0) { 754 if (node->tn_size <= uio->uio_offset) 755 break; 756 len = MIN(node->tn_size - uio->uio_offset, resid); 757 if (len == 0) 758 break; 759 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 760 if ((error != 0) || (resid == uio->uio_resid)) 761 break; 762 } 763 764 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 765 (extended ? TMPFS_NODE_CHANGED : 0); 766 767 if (node->tn_mode & (S_ISUID | S_ISGID)) { 768 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 769 node->tn_mode &= ~(S_ISUID | S_ISGID); 770 } 771 772 if (error != 0) 773 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 774 775 out: 776 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 777 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 778 779 return error; 780 } 781 782 /* --------------------------------------------------------------------- */ 783 784 static int 785 tmpfs_fsync(struct vop_fsync_args *v) 786 { 787 struct vnode *vp = v->a_vp; 788 789 MPASS(VOP_ISLOCKED(vp)); 790 791 tmpfs_update(vp); 792 793 return 0; 794 } 795 796 /* --------------------------------------------------------------------- */ 797 798 static int 799 tmpfs_remove(struct vop_remove_args *v) 800 { 801 struct vnode *dvp = v->a_dvp; 802 struct vnode *vp = v->a_vp; 803 804 int error; 805 struct tmpfs_dirent *de; 806 struct tmpfs_mount *tmp; 807 struct tmpfs_node *dnode; 808 struct tmpfs_node *node; 809 810 MPASS(VOP_ISLOCKED(dvp)); 811 MPASS(VOP_ISLOCKED(vp)); 812 813 if (vp->v_type == VDIR) { 814 error = EISDIR; 815 goto out; 816 } 817 818 dnode = VP_TO_TMPFS_DIR(dvp); 819 node = VP_TO_TMPFS_NODE(vp); 820 tmp = VFS_TO_TMPFS(vp->v_mount); 821 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 822 MPASS(de != NULL); 823 824 /* Files marked as immutable or append-only cannot be deleted. */ 825 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 826 (dnode->tn_flags & APPEND)) { 827 error = EPERM; 828 goto out; 829 } 830 831 /* Remove the entry from the directory; as it is a file, we do not 832 * have to change the number of hard links of the directory. */ 833 tmpfs_dir_detach(dvp, de); 834 if (v->a_cnp->cn_flags & DOWHITEOUT) 835 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 836 837 /* Free the directory entry we just deleted. Note that the node 838 * referred by it will not be removed until the vnode is really 839 * reclaimed. */ 840 tmpfs_free_dirent(tmp, de); 841 842 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 843 error = 0; 844 845 out: 846 847 return error; 848 } 849 850 /* --------------------------------------------------------------------- */ 851 852 static int 853 tmpfs_link(struct vop_link_args *v) 854 { 855 struct vnode *dvp = v->a_tdvp; 856 struct vnode *vp = v->a_vp; 857 struct componentname *cnp = v->a_cnp; 858 859 int error; 860 struct tmpfs_dirent *de; 861 struct tmpfs_node *node; 862 863 MPASS(VOP_ISLOCKED(dvp)); 864 MPASS(cnp->cn_flags & HASBUF); 865 MPASS(dvp != vp); /* XXX When can this be false? */ 866 867 node = VP_TO_TMPFS_NODE(vp); 868 869 /* XXX: Why aren't the following two tests done by the caller? */ 870 871 /* Hard links of directories are forbidden. */ 872 if (vp->v_type == VDIR) { 873 error = EPERM; 874 goto out; 875 } 876 877 /* Cannot create cross-device links. */ 878 if (dvp->v_mount != vp->v_mount) { 879 error = EXDEV; 880 goto out; 881 } 882 883 /* Ensure that we do not overflow the maximum number of links imposed 884 * by the system. */ 885 MPASS(node->tn_links <= LINK_MAX); 886 if (node->tn_links == LINK_MAX) { 887 error = EMLINK; 888 goto out; 889 } 890 891 /* We cannot create links of files marked immutable or append-only. */ 892 if (node->tn_flags & (IMMUTABLE | APPEND)) { 893 error = EPERM; 894 goto out; 895 } 896 897 /* Allocate a new directory entry to represent the node. */ 898 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 899 cnp->cn_nameptr, cnp->cn_namelen, &de); 900 if (error != 0) 901 goto out; 902 903 /* Insert the new directory entry into the appropriate directory. */ 904 if (cnp->cn_flags & ISWHITEOUT) 905 tmpfs_dir_whiteout_remove(dvp, cnp); 906 tmpfs_dir_attach(dvp, de); 907 908 /* vp link count has changed, so update node times. */ 909 node->tn_status |= TMPFS_NODE_CHANGED; 910 tmpfs_update(vp); 911 912 error = 0; 913 914 out: 915 return error; 916 } 917 918 /* --------------------------------------------------------------------- */ 919 920 /* 921 * We acquire all but fdvp locks using non-blocking acquisitions. If we 922 * fail to acquire any lock in the path we will drop all held locks, 923 * acquire the new lock in a blocking fashion, and then release it and 924 * restart the rename. This acquire/release step ensures that we do not 925 * spin on a lock waiting for release. On error release all vnode locks 926 * and decrement references the way tmpfs_rename() would do. 927 */ 928 static int 929 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 930 struct vnode *tdvp, struct vnode **tvpp, 931 struct componentname *fcnp, struct componentname *tcnp) 932 { 933 struct vnode *nvp; 934 struct mount *mp; 935 struct tmpfs_dirent *de; 936 int error, restarts = 0; 937 938 VOP_UNLOCK(tdvp, 0); 939 if (*tvpp != NULL && *tvpp != tdvp) 940 VOP_UNLOCK(*tvpp, 0); 941 mp = fdvp->v_mount; 942 943 relock: 944 restarts += 1; 945 error = vn_lock(fdvp, LK_EXCLUSIVE); 946 if (error) 947 goto releout; 948 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 949 VOP_UNLOCK(fdvp, 0); 950 error = vn_lock(tdvp, LK_EXCLUSIVE); 951 if (error) 952 goto releout; 953 VOP_UNLOCK(tdvp, 0); 954 goto relock; 955 } 956 /* 957 * Re-resolve fvp to be certain it still exists and fetch the 958 * correct vnode. 959 */ 960 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 961 if (de == NULL) { 962 VOP_UNLOCK(fdvp, 0); 963 VOP_UNLOCK(tdvp, 0); 964 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 965 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 966 error = EINVAL; 967 else 968 error = ENOENT; 969 goto releout; 970 } 971 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 972 if (error != 0) { 973 VOP_UNLOCK(fdvp, 0); 974 VOP_UNLOCK(tdvp, 0); 975 if (error != EBUSY) 976 goto releout; 977 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 978 if (error != 0) 979 goto releout; 980 VOP_UNLOCK(nvp, 0); 981 /* 982 * Concurrent rename race. 983 */ 984 if (nvp == tdvp) { 985 vrele(nvp); 986 error = EINVAL; 987 goto releout; 988 } 989 vrele(*fvpp); 990 *fvpp = nvp; 991 goto relock; 992 } 993 vrele(*fvpp); 994 *fvpp = nvp; 995 VOP_UNLOCK(*fvpp, 0); 996 /* 997 * Re-resolve tvp and acquire the vnode lock if present. 998 */ 999 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 1000 /* 1001 * If tvp disappeared we just carry on. 1002 */ 1003 if (de == NULL && *tvpp != NULL) { 1004 vrele(*tvpp); 1005 *tvpp = NULL; 1006 } 1007 /* 1008 * Get the tvp ino if the lookup succeeded. We may have to restart 1009 * if the non-blocking acquire fails. 1010 */ 1011 if (de != NULL) { 1012 nvp = NULL; 1013 error = tmpfs_alloc_vp(mp, de->td_node, 1014 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 1015 if (*tvpp != NULL) 1016 vrele(*tvpp); 1017 *tvpp = nvp; 1018 if (error != 0) { 1019 VOP_UNLOCK(fdvp, 0); 1020 VOP_UNLOCK(tdvp, 0); 1021 if (error != EBUSY) 1022 goto releout; 1023 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 1024 &nvp); 1025 if (error != 0) 1026 goto releout; 1027 VOP_UNLOCK(nvp, 0); 1028 /* 1029 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 1030 */ 1031 if (nvp == fdvp) { 1032 error = ENOTEMPTY; 1033 goto releout; 1034 } 1035 goto relock; 1036 } 1037 } 1038 tmpfs_rename_restarts += restarts; 1039 1040 return (0); 1041 1042 releout: 1043 vrele(fdvp); 1044 vrele(*fvpp); 1045 vrele(tdvp); 1046 if (*tvpp != NULL) 1047 vrele(*tvpp); 1048 tmpfs_rename_restarts += restarts; 1049 1050 return (error); 1051 } 1052 1053 static int 1054 tmpfs_rename(struct vop_rename_args *v) 1055 { 1056 struct vnode *fdvp = v->a_fdvp; 1057 struct vnode *fvp = v->a_fvp; 1058 struct componentname *fcnp = v->a_fcnp; 1059 struct vnode *tdvp = v->a_tdvp; 1060 struct vnode *tvp = v->a_tvp; 1061 struct componentname *tcnp = v->a_tcnp; 1062 struct mount *mp = NULL; 1063 1064 char *newname; 1065 int error; 1066 struct tmpfs_dirent *de; 1067 struct tmpfs_mount *tmp; 1068 struct tmpfs_node *fdnode; 1069 struct tmpfs_node *fnode; 1070 struct tmpfs_node *tnode; 1071 struct tmpfs_node *tdnode; 1072 1073 MPASS(VOP_ISLOCKED(tdvp)); 1074 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 1075 MPASS(fcnp->cn_flags & HASBUF); 1076 MPASS(tcnp->cn_flags & HASBUF); 1077 1078 /* Disallow cross-device renames. 1079 * XXX Why isn't this done by the caller? */ 1080 if (fvp->v_mount != tdvp->v_mount || 1081 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1082 error = EXDEV; 1083 goto out; 1084 } 1085 1086 /* If source and target are the same file, there is nothing to do. */ 1087 if (fvp == tvp) { 1088 error = 0; 1089 goto out; 1090 } 1091 1092 /* If we need to move the directory between entries, lock the 1093 * source so that we can safely operate on it. */ 1094 if (fdvp != tdvp && fdvp != tvp) { 1095 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1096 mp = tdvp->v_mount; 1097 error = vfs_busy(mp, 0); 1098 if (error != 0) { 1099 mp = NULL; 1100 goto out; 1101 } 1102 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1103 fcnp, tcnp); 1104 if (error != 0) { 1105 vfs_unbusy(mp); 1106 return (error); 1107 } 1108 ASSERT_VOP_ELOCKED(fdvp, 1109 "tmpfs_rename: fdvp not locked"); 1110 ASSERT_VOP_ELOCKED(tdvp, 1111 "tmpfs_rename: tdvp not locked"); 1112 if (tvp != NULL) 1113 ASSERT_VOP_ELOCKED(tvp, 1114 "tmpfs_rename: tvp not locked"); 1115 if (fvp == tvp) { 1116 error = 0; 1117 goto out_locked; 1118 } 1119 } 1120 } 1121 1122 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1123 tdnode = VP_TO_TMPFS_DIR(tdvp); 1124 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1125 fdnode = VP_TO_TMPFS_DIR(fdvp); 1126 fnode = VP_TO_TMPFS_NODE(fvp); 1127 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1128 1129 /* Entry can disappear before we lock fdvp, 1130 * also avoid manipulating '.' and '..' entries. */ 1131 if (de == NULL) { 1132 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1133 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1134 error = EINVAL; 1135 else 1136 error = ENOENT; 1137 goto out_locked; 1138 } 1139 MPASS(de->td_node == fnode); 1140 1141 /* If re-naming a directory to another preexisting directory 1142 * ensure that the target directory is empty so that its 1143 * removal causes no side effects. 1144 * Kern_rename gurantees the destination to be a directory 1145 * if the source is one. */ 1146 if (tvp != NULL) { 1147 MPASS(tnode != NULL); 1148 1149 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1150 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1151 error = EPERM; 1152 goto out_locked; 1153 } 1154 1155 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1156 if (tnode->tn_size > 0) { 1157 error = ENOTEMPTY; 1158 goto out_locked; 1159 } 1160 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1161 error = ENOTDIR; 1162 goto out_locked; 1163 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1164 error = EISDIR; 1165 goto out_locked; 1166 } else { 1167 MPASS(fnode->tn_type != VDIR && 1168 tnode->tn_type != VDIR); 1169 } 1170 } 1171 1172 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1173 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1174 error = EPERM; 1175 goto out_locked; 1176 } 1177 1178 /* Ensure that we have enough memory to hold the new name, if it 1179 * has to be changed. */ 1180 if (fcnp->cn_namelen != tcnp->cn_namelen || 1181 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1182 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1183 } else 1184 newname = NULL; 1185 1186 /* If the node is being moved to another directory, we have to do 1187 * the move. */ 1188 if (fdnode != tdnode) { 1189 /* In case we are moving a directory, we have to adjust its 1190 * parent to point to the new parent. */ 1191 if (de->td_node->tn_type == VDIR) { 1192 struct tmpfs_node *n; 1193 1194 /* Ensure the target directory is not a child of the 1195 * directory being moved. Otherwise, we'd end up 1196 * with stale nodes. */ 1197 n = tdnode; 1198 /* TMPFS_LOCK garanties that no nodes are freed while 1199 * traversing the list. Nodes can only be marked as 1200 * removed: tn_parent == NULL. */ 1201 TMPFS_LOCK(tmp); 1202 TMPFS_NODE_LOCK(n); 1203 while (n != n->tn_dir.tn_parent) { 1204 struct tmpfs_node *parent; 1205 1206 if (n == fnode) { 1207 TMPFS_NODE_UNLOCK(n); 1208 TMPFS_UNLOCK(tmp); 1209 error = EINVAL; 1210 if (newname != NULL) 1211 free(newname, M_TMPFSNAME); 1212 goto out_locked; 1213 } 1214 parent = n->tn_dir.tn_parent; 1215 TMPFS_NODE_UNLOCK(n); 1216 if (parent == NULL) { 1217 n = NULL; 1218 break; 1219 } 1220 TMPFS_NODE_LOCK(parent); 1221 if (parent->tn_dir.tn_parent == NULL) { 1222 TMPFS_NODE_UNLOCK(parent); 1223 n = NULL; 1224 break; 1225 } 1226 n = parent; 1227 } 1228 TMPFS_UNLOCK(tmp); 1229 if (n == NULL) { 1230 error = EINVAL; 1231 if (newname != NULL) 1232 free(newname, M_TMPFSNAME); 1233 goto out_locked; 1234 } 1235 TMPFS_NODE_UNLOCK(n); 1236 1237 /* Adjust the parent pointer. */ 1238 TMPFS_VALIDATE_DIR(fnode); 1239 TMPFS_NODE_LOCK(de->td_node); 1240 de->td_node->tn_dir.tn_parent = tdnode; 1241 TMPFS_NODE_UNLOCK(de->td_node); 1242 1243 /* As a result of changing the target of the '..' 1244 * entry, the link count of the source and target 1245 * directories has to be adjusted. */ 1246 TMPFS_NODE_LOCK(tdnode); 1247 TMPFS_ASSERT_LOCKED(tdnode); 1248 tdnode->tn_links++; 1249 TMPFS_NODE_UNLOCK(tdnode); 1250 1251 TMPFS_NODE_LOCK(fdnode); 1252 TMPFS_ASSERT_LOCKED(fdnode); 1253 fdnode->tn_links--; 1254 TMPFS_NODE_UNLOCK(fdnode); 1255 } 1256 } 1257 1258 /* Do the move: just remove the entry from the source directory 1259 * and insert it into the target one. */ 1260 tmpfs_dir_detach(fdvp, de); 1261 1262 if (fcnp->cn_flags & DOWHITEOUT) 1263 tmpfs_dir_whiteout_add(fdvp, fcnp); 1264 if (tcnp->cn_flags & ISWHITEOUT) 1265 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1266 1267 /* If the name has changed, we need to make it effective by changing 1268 * it in the directory entry. */ 1269 if (newname != NULL) { 1270 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1271 1272 free(de->ud.td_name, M_TMPFSNAME); 1273 de->ud.td_name = newname; 1274 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1275 1276 fnode->tn_status |= TMPFS_NODE_CHANGED; 1277 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1278 } 1279 1280 /* If we are overwriting an entry, we have to remove the old one 1281 * from the target directory. */ 1282 if (tvp != NULL) { 1283 struct tmpfs_dirent *tde; 1284 1285 /* Remove the old entry from the target directory. */ 1286 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1287 tmpfs_dir_detach(tdvp, tde); 1288 1289 /* Free the directory entry we just deleted. Note that the 1290 * node referred by it will not be removed until the vnode is 1291 * really reclaimed. */ 1292 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1293 } 1294 1295 tmpfs_dir_attach(tdvp, de); 1296 1297 cache_purge(fvp); 1298 if (tvp != NULL) 1299 cache_purge(tvp); 1300 cache_purge_negative(tdvp); 1301 1302 error = 0; 1303 1304 out_locked: 1305 if (fdvp != tdvp && fdvp != tvp) 1306 VOP_UNLOCK(fdvp, 0); 1307 1308 out: 1309 /* Release target nodes. */ 1310 /* XXX: I don't understand when tdvp can be the same as tvp, but 1311 * other code takes care of this... */ 1312 if (tdvp == tvp) 1313 vrele(tdvp); 1314 else 1315 vput(tdvp); 1316 if (tvp != NULL) 1317 vput(tvp); 1318 1319 /* Release source nodes. */ 1320 vrele(fdvp); 1321 vrele(fvp); 1322 1323 if (mp != NULL) 1324 vfs_unbusy(mp); 1325 1326 return error; 1327 } 1328 1329 /* --------------------------------------------------------------------- */ 1330 1331 static int 1332 tmpfs_mkdir(struct vop_mkdir_args *v) 1333 { 1334 struct vnode *dvp = v->a_dvp; 1335 struct vnode **vpp = v->a_vpp; 1336 struct componentname *cnp = v->a_cnp; 1337 struct vattr *vap = v->a_vap; 1338 1339 MPASS(vap->va_type == VDIR); 1340 1341 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1342 } 1343 1344 /* --------------------------------------------------------------------- */ 1345 1346 static int 1347 tmpfs_rmdir(struct vop_rmdir_args *v) 1348 { 1349 struct vnode *dvp = v->a_dvp; 1350 struct vnode *vp = v->a_vp; 1351 1352 int error; 1353 struct tmpfs_dirent *de; 1354 struct tmpfs_mount *tmp; 1355 struct tmpfs_node *dnode; 1356 struct tmpfs_node *node; 1357 1358 MPASS(VOP_ISLOCKED(dvp)); 1359 MPASS(VOP_ISLOCKED(vp)); 1360 1361 tmp = VFS_TO_TMPFS(dvp->v_mount); 1362 dnode = VP_TO_TMPFS_DIR(dvp); 1363 node = VP_TO_TMPFS_DIR(vp); 1364 1365 /* Directories with more than two entries ('.' and '..') cannot be 1366 * removed. */ 1367 if (node->tn_size > 0) { 1368 error = ENOTEMPTY; 1369 goto out; 1370 } 1371 1372 if ((dnode->tn_flags & APPEND) 1373 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1374 error = EPERM; 1375 goto out; 1376 } 1377 1378 /* This invariant holds only if we are not trying to remove "..". 1379 * We checked for that above so this is safe now. */ 1380 MPASS(node->tn_dir.tn_parent == dnode); 1381 1382 /* Get the directory entry associated with node (vp). This was 1383 * filled by tmpfs_lookup while looking up the entry. */ 1384 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1385 MPASS(TMPFS_DIRENT_MATCHES(de, 1386 v->a_cnp->cn_nameptr, 1387 v->a_cnp->cn_namelen)); 1388 1389 /* Check flags to see if we are allowed to remove the directory. */ 1390 if (dnode->tn_flags & APPEND 1391 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1392 error = EPERM; 1393 goto out; 1394 } 1395 1396 1397 /* Detach the directory entry from the directory (dnode). */ 1398 tmpfs_dir_detach(dvp, de); 1399 if (v->a_cnp->cn_flags & DOWHITEOUT) 1400 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1401 1402 /* No vnode should be allocated for this entry from this point */ 1403 TMPFS_NODE_LOCK(node); 1404 TMPFS_ASSERT_ELOCKED(node); 1405 node->tn_links--; 1406 node->tn_dir.tn_parent = NULL; 1407 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1408 TMPFS_NODE_MODIFIED; 1409 1410 TMPFS_NODE_UNLOCK(node); 1411 1412 TMPFS_NODE_LOCK(dnode); 1413 TMPFS_ASSERT_ELOCKED(dnode); 1414 dnode->tn_links--; 1415 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1416 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1417 TMPFS_NODE_UNLOCK(dnode); 1418 1419 cache_purge(dvp); 1420 cache_purge(vp); 1421 1422 /* Free the directory entry we just deleted. Note that the node 1423 * referred by it will not be removed until the vnode is really 1424 * reclaimed. */ 1425 tmpfs_free_dirent(tmp, de); 1426 1427 /* Release the deleted vnode (will destroy the node, notify 1428 * interested parties and clean it from the cache). */ 1429 1430 dnode->tn_status |= TMPFS_NODE_CHANGED; 1431 tmpfs_update(dvp); 1432 1433 error = 0; 1434 1435 out: 1436 return error; 1437 } 1438 1439 /* --------------------------------------------------------------------- */ 1440 1441 static int 1442 tmpfs_symlink(struct vop_symlink_args *v) 1443 { 1444 struct vnode *dvp = v->a_dvp; 1445 struct vnode **vpp = v->a_vpp; 1446 struct componentname *cnp = v->a_cnp; 1447 struct vattr *vap = v->a_vap; 1448 char *target = v->a_target; 1449 1450 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1451 MPASS(vap->va_type == VLNK); 1452 #else 1453 vap->va_type = VLNK; 1454 #endif 1455 1456 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1457 } 1458 1459 /* --------------------------------------------------------------------- */ 1460 1461 static int 1462 tmpfs_readdir(struct vop_readdir_args *v) 1463 { 1464 struct vnode *vp = v->a_vp; 1465 struct uio *uio = v->a_uio; 1466 int *eofflag = v->a_eofflag; 1467 u_long **cookies = v->a_cookies; 1468 int *ncookies = v->a_ncookies; 1469 1470 int error; 1471 ssize_t startresid; 1472 int cnt = 0; 1473 struct tmpfs_node *node; 1474 1475 /* This operation only makes sense on directory nodes. */ 1476 if (vp->v_type != VDIR) 1477 return ENOTDIR; 1478 1479 node = VP_TO_TMPFS_DIR(vp); 1480 1481 startresid = uio->uio_resid; 1482 1483 if (cookies != NULL && ncookies != NULL) { 1484 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1485 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1486 *ncookies = 0; 1487 } 1488 1489 if (cnt == 0) 1490 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1491 else 1492 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1493 1494 if (error == EJUSTRETURN) 1495 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1496 1497 if (error != 0 && cnt != 0) 1498 free(*cookies, M_TEMP); 1499 1500 if (eofflag != NULL) 1501 *eofflag = 1502 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1503 1504 return error; 1505 } 1506 1507 /* --------------------------------------------------------------------- */ 1508 1509 static int 1510 tmpfs_readlink(struct vop_readlink_args *v) 1511 { 1512 struct vnode *vp = v->a_vp; 1513 struct uio *uio = v->a_uio; 1514 1515 int error; 1516 struct tmpfs_node *node; 1517 1518 MPASS(uio->uio_offset == 0); 1519 MPASS(vp->v_type == VLNK); 1520 1521 node = VP_TO_TMPFS_NODE(vp); 1522 1523 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1524 uio); 1525 node->tn_status |= TMPFS_NODE_ACCESSED; 1526 1527 return error; 1528 } 1529 1530 /* --------------------------------------------------------------------- */ 1531 1532 static int 1533 tmpfs_inactive(struct vop_inactive_args *v) 1534 { 1535 struct vnode *vp = v->a_vp; 1536 1537 struct tmpfs_node *node; 1538 1539 MPASS(VOP_ISLOCKED(vp)); 1540 1541 node = VP_TO_TMPFS_NODE(vp); 1542 1543 if (node->tn_links == 0) 1544 vrecycle(vp); 1545 1546 return 0; 1547 } 1548 1549 /* --------------------------------------------------------------------- */ 1550 1551 int 1552 tmpfs_reclaim(struct vop_reclaim_args *v) 1553 { 1554 struct vnode *vp = v->a_vp; 1555 1556 struct tmpfs_mount *tmp; 1557 struct tmpfs_node *node; 1558 1559 node = VP_TO_TMPFS_NODE(vp); 1560 tmp = VFS_TO_TMPFS(vp->v_mount); 1561 1562 vnode_destroy_vobject(vp); 1563 cache_purge(vp); 1564 1565 TMPFS_NODE_LOCK(node); 1566 TMPFS_ASSERT_ELOCKED(node); 1567 tmpfs_free_vp(vp); 1568 1569 /* If the node referenced by this vnode was deleted by the user, 1570 * we must free its associated data structures (now that the vnode 1571 * is being reclaimed). */ 1572 if (node->tn_links == 0 && 1573 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1574 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1575 TMPFS_NODE_UNLOCK(node); 1576 tmpfs_free_node(tmp, node); 1577 } else 1578 TMPFS_NODE_UNLOCK(node); 1579 1580 MPASS(vp->v_data == NULL); 1581 return 0; 1582 } 1583 1584 /* --------------------------------------------------------------------- */ 1585 1586 static int 1587 tmpfs_print(struct vop_print_args *v) 1588 { 1589 struct vnode *vp = v->a_vp; 1590 1591 struct tmpfs_node *node; 1592 1593 node = VP_TO_TMPFS_NODE(vp); 1594 1595 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1596 node, node->tn_flags, node->tn_links); 1597 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1598 node->tn_mode, node->tn_uid, node->tn_gid, 1599 (intmax_t)node->tn_size, node->tn_status); 1600 1601 if (vp->v_type == VFIFO) 1602 fifo_printinfo(vp); 1603 1604 printf("\n"); 1605 1606 return 0; 1607 } 1608 1609 /* --------------------------------------------------------------------- */ 1610 1611 static int 1612 tmpfs_pathconf(struct vop_pathconf_args *v) 1613 { 1614 int name = v->a_name; 1615 register_t *retval = v->a_retval; 1616 1617 int error; 1618 1619 error = 0; 1620 1621 switch (name) { 1622 case _PC_LINK_MAX: 1623 *retval = LINK_MAX; 1624 break; 1625 1626 case _PC_NAME_MAX: 1627 *retval = NAME_MAX; 1628 break; 1629 1630 case _PC_PATH_MAX: 1631 *retval = PATH_MAX; 1632 break; 1633 1634 case _PC_PIPE_BUF: 1635 *retval = PIPE_BUF; 1636 break; 1637 1638 case _PC_CHOWN_RESTRICTED: 1639 *retval = 1; 1640 break; 1641 1642 case _PC_NO_TRUNC: 1643 *retval = 1; 1644 break; 1645 1646 case _PC_SYNC_IO: 1647 *retval = 1; 1648 break; 1649 1650 case _PC_FILESIZEBITS: 1651 *retval = 0; /* XXX Don't know which value should I return. */ 1652 break; 1653 1654 default: 1655 error = EINVAL; 1656 } 1657 1658 return error; 1659 } 1660 1661 static int 1662 tmpfs_vptofh(struct vop_vptofh_args *ap) 1663 { 1664 struct tmpfs_fid *tfhp; 1665 struct tmpfs_node *node; 1666 1667 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1668 node = VP_TO_TMPFS_NODE(ap->a_vp); 1669 1670 tfhp->tf_len = sizeof(struct tmpfs_fid); 1671 tfhp->tf_id = node->tn_id; 1672 tfhp->tf_gen = node->tn_gen; 1673 1674 return (0); 1675 } 1676 1677 static int 1678 tmpfs_whiteout(struct vop_whiteout_args *ap) 1679 { 1680 struct vnode *dvp = ap->a_dvp; 1681 struct componentname *cnp = ap->a_cnp; 1682 struct tmpfs_dirent *de; 1683 1684 switch (ap->a_flags) { 1685 case LOOKUP: 1686 return (0); 1687 case CREATE: 1688 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1689 if (de != NULL) 1690 return (de->td_node == NULL ? 0 : EEXIST); 1691 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1692 case DELETE: 1693 tmpfs_dir_whiteout_remove(dvp, cnp); 1694 return (0); 1695 default: 1696 panic("tmpfs_whiteout: unknown op"); 1697 } 1698 } 1699 1700 /* --------------------------------------------------------------------- */ 1701 1702 /* 1703 * vnode operations vector used for files stored in a tmpfs file system. 1704 */ 1705 struct vop_vector tmpfs_vnodeop_entries = { 1706 .vop_default = &default_vnodeops, 1707 .vop_lookup = vfs_cache_lookup, 1708 .vop_cachedlookup = tmpfs_lookup, 1709 .vop_create = tmpfs_create, 1710 .vop_mknod = tmpfs_mknod, 1711 .vop_open = tmpfs_open, 1712 .vop_close = tmpfs_close, 1713 .vop_access = tmpfs_access, 1714 .vop_getattr = tmpfs_getattr, 1715 .vop_setattr = tmpfs_setattr, 1716 .vop_read = tmpfs_read, 1717 .vop_write = tmpfs_write, 1718 .vop_fsync = tmpfs_fsync, 1719 .vop_remove = tmpfs_remove, 1720 .vop_link = tmpfs_link, 1721 .vop_rename = tmpfs_rename, 1722 .vop_mkdir = tmpfs_mkdir, 1723 .vop_rmdir = tmpfs_rmdir, 1724 .vop_symlink = tmpfs_symlink, 1725 .vop_readdir = tmpfs_readdir, 1726 .vop_readlink = tmpfs_readlink, 1727 .vop_inactive = tmpfs_inactive, 1728 .vop_reclaim = tmpfs_reclaim, 1729 .vop_print = tmpfs_print, 1730 .vop_pathconf = tmpfs_pathconf, 1731 .vop_vptofh = tmpfs_vptofh, 1732 .vop_whiteout = tmpfs_whiteout, 1733 .vop_bmap = VOP_EOPNOTSUPP, 1734 }; 1735 1736