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/namei.h> 43#include <sys/priv.h> 44#include <sys/proc.h> 45#include <sys/sched.h> 46#include <sys/sf_buf.h> 47#include <sys/stat.h> 48#include <sys/systm.h> 49#include <sys/sysctl.h> 50#include <sys/unistd.h> 51#include <sys/vnode.h> 52 53#include <vm/vm.h> 54#include <vm/vm_param.h> 55#include <vm/vm_object.h> 56#include <vm/vm_page.h> 57#include <vm/vm_pager.h> 58 59#include <machine/_inttypes.h> 60 61#include <fs/fifofs/fifo.h> 62#include <fs/tmpfs/tmpfs_vnops.h> 63#include <fs/tmpfs/tmpfs.h> 64 65SYSCTL_DECL(_vfs_tmpfs); 66 67static volatile int tmpfs_rename_restarts; 68SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 69 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 70 "Times rename had to restart due to lock contention"); 71 72/* --------------------------------------------------------------------- */ 73 74static int 75tmpfs_lookup(struct vop_cachedlookup_args *v) 76{ 77 struct vnode *dvp = v->a_dvp; 78 struct vnode **vpp = v->a_vpp; 79 struct componentname *cnp = v->a_cnp; 80 81 int error; 82 struct tmpfs_dirent *de; 83 struct tmpfs_node *dnode; 84 85 dnode = VP_TO_TMPFS_DIR(dvp); 86 *vpp = NULLVP; 87 88 /* Check accessibility of requested node as a first step. */ 89 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 90 if (error != 0) 91 goto out; 92 93 /* We cannot be requesting the parent directory of the root node. */ 94 MPASS(IMPLIES(dnode->tn_type == VDIR && 95 dnode->tn_dir.tn_parent == dnode, 96 !(cnp->cn_flags & ISDOTDOT))); 97 98 TMPFS_ASSERT_LOCKED(dnode); 99 if (dnode->tn_dir.tn_parent == NULL) { 100 error = ENOENT; 101 goto out; 102 } 103 if (cnp->cn_flags & ISDOTDOT) { 104 int ltype = 0; 105 106 ltype = VOP_ISLOCKED(dvp); 107 vhold(dvp); 108 VOP_UNLOCK(dvp, 0); 109 /* Allocate a new vnode on the matching entry. */ 110 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 111 cnp->cn_lkflags, vpp); 112 113 vn_lock(dvp, ltype | LK_RETRY); 114 vdrop(dvp); 115 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 116 VREF(dvp); 117 *vpp = dvp; 118 error = 0; 119 } else { 120 de = tmpfs_dir_lookup(dnode, NULL, cnp); 121 if (de != NULL && de->td_node == NULL) 122 cnp->cn_flags |= ISWHITEOUT; 123 if (de == NULL || de->td_node == NULL) { 124 /* The entry was not found in the directory. 125 * This is OK if we are creating or renaming an 126 * entry and are working on the last component of 127 * the path name. */ 128 if ((cnp->cn_flags & ISLASTCN) && 129 (cnp->cn_nameiop == CREATE || \ 130 cnp->cn_nameiop == RENAME || 131 (cnp->cn_nameiop == DELETE && 132 cnp->cn_flags & DOWHITEOUT && 133 cnp->cn_flags & ISWHITEOUT))) { 134 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 135 cnp->cn_thread); 136 if (error != 0) 137 goto out; 138 139 /* Keep the component name in the buffer for 140 * future uses. */ 141 cnp->cn_flags |= SAVENAME; 142 143 error = EJUSTRETURN; 144 } else 145 error = ENOENT; 146 } else { 147 struct tmpfs_node *tnode; 148 149 /* The entry was found, so get its associated 150 * tmpfs_node. */ 151 tnode = de->td_node; 152 153 /* If we are not at the last path component and 154 * found a non-directory or non-link entry (which 155 * may itself be pointing to a directory), raise 156 * an error. */ 157 if ((tnode->tn_type != VDIR && 158 tnode->tn_type != VLNK) && 159 !(cnp->cn_flags & ISLASTCN)) { 160 error = ENOTDIR; 161 goto out; 162 } 163 164 /* If we are deleting or renaming the entry, keep 165 * track of its tmpfs_dirent so that it can be 166 * easily deleted later. */ 167 if ((cnp->cn_flags & ISLASTCN) && 168 (cnp->cn_nameiop == DELETE || 169 cnp->cn_nameiop == RENAME)) { 170 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 171 cnp->cn_thread); 172 if (error != 0) 173 goto out; 174 175 /* Allocate a new vnode on the matching entry. */ 176 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 177 cnp->cn_lkflags, vpp); 178 if (error != 0) 179 goto out; 180 181 if ((dnode->tn_mode & S_ISTXT) && 182 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 183 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 184 error = EPERM; 185 vput(*vpp); 186 *vpp = NULL; 187 goto out; 188 } 189 cnp->cn_flags |= SAVENAME; 190 } else { 191 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 192 cnp->cn_lkflags, vpp); 193 } 194 } 195 } 196 197 /* Store the result of this lookup in the cache. Avoid this if the 198 * request was for creation, as it does not improve timings on 199 * emprical tests. */ 200 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 201 cache_enter(dvp, *vpp, cnp); 202 203out: 204 /* If there were no errors, *vpp cannot be null and it must be 205 * locked. */ 206 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 207 208 return error; 209} 210 211/* --------------------------------------------------------------------- */ 212 213static int 214tmpfs_create(struct vop_create_args *v) 215{ 216 struct vnode *dvp = v->a_dvp; 217 struct vnode **vpp = v->a_vpp; 218 struct componentname *cnp = v->a_cnp; 219 struct vattr *vap = v->a_vap; 220 221 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 222 223 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 224} 225/* --------------------------------------------------------------------- */ 226 227static int 228tmpfs_mknod(struct vop_mknod_args *v) 229{ 230 struct vnode *dvp = v->a_dvp; 231 struct vnode **vpp = v->a_vpp; 232 struct componentname *cnp = v->a_cnp; 233 struct vattr *vap = v->a_vap; 234 235 if (vap->va_type != VBLK && vap->va_type != VCHR && 236 vap->va_type != VFIFO) 237 return EINVAL; 238 239 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 240} 241 242/* --------------------------------------------------------------------- */ 243 244static int 245tmpfs_open(struct vop_open_args *v) 246{ 247 struct vnode *vp = v->a_vp; 248 int mode = v->a_mode; 249 250 int error; 251 struct tmpfs_node *node; 252 253 MPASS(VOP_ISLOCKED(vp)); 254 255 node = VP_TO_TMPFS_NODE(vp); 256 257 /* The file is still active but all its names have been removed 258 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 259 * it is about to die. */ 260 if (node->tn_links < 1) 261 return (ENOENT); 262 263 /* If the file is marked append-only, deny write requests. */ 264 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 265 error = EPERM; 266 else { 267 error = 0; 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273} 274 275/* --------------------------------------------------------------------- */ 276 277static int 278tmpfs_close(struct vop_close_args *v) 279{ 280 struct vnode *vp = v->a_vp; 281 282 MPASS(VOP_ISLOCKED(vp)); 283 284 /* Update node times. */ 285 tmpfs_update(vp); 286 287 return (0); 288} 289 290/* --------------------------------------------------------------------- */ 291 292int 293tmpfs_access(struct vop_access_args *v) 294{ 295 struct vnode *vp = v->a_vp; 296 accmode_t accmode = v->a_accmode; 297 struct ucred *cred = v->a_cred; 298 299 int error; 300 struct tmpfs_node *node; 301 302 MPASS(VOP_ISLOCKED(vp)); 303 304 node = VP_TO_TMPFS_NODE(vp); 305 306 switch (vp->v_type) { 307 case VDIR: 308 /* FALLTHROUGH */ 309 case VLNK: 310 /* FALLTHROUGH */ 311 case VREG: 312 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 313 error = EROFS; 314 goto out; 315 } 316 break; 317 318 case VBLK: 319 /* FALLTHROUGH */ 320 case VCHR: 321 /* FALLTHROUGH */ 322 case VSOCK: 323 /* FALLTHROUGH */ 324 case VFIFO: 325 break; 326 327 default: 328 error = EINVAL; 329 goto out; 330 } 331 332 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 333 error = EPERM; 334 goto out; 335 } 336 337 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 338 node->tn_gid, accmode, cred, NULL); 339 340out: 341 MPASS(VOP_ISLOCKED(vp)); 342 343 return error; 344} 345 346/* --------------------------------------------------------------------- */ 347 348int 349tmpfs_getattr(struct vop_getattr_args *v) 350{ 351 struct vnode *vp = v->a_vp; 352 struct vattr *vap = v->a_vap; 353 354 struct tmpfs_node *node; 355 356 node = VP_TO_TMPFS_NODE(vp); 357 358 tmpfs_update(vp); 359 360 vap->va_type = vp->v_type; 361 vap->va_mode = node->tn_mode; 362 vap->va_nlink = node->tn_links; 363 vap->va_uid = node->tn_uid; 364 vap->va_gid = node->tn_gid; 365 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 366 vap->va_fileid = node->tn_id; 367 vap->va_size = node->tn_size; 368 vap->va_blocksize = PAGE_SIZE; 369 vap->va_atime = node->tn_atime; 370 vap->va_mtime = node->tn_mtime; 371 vap->va_ctime = node->tn_ctime; 372 vap->va_birthtime = node->tn_birthtime; 373 vap->va_gen = node->tn_gen; 374 vap->va_flags = node->tn_flags; 375 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 376 node->tn_rdev : NODEV; 377 vap->va_bytes = round_page(node->tn_size); 378 vap->va_filerev = 0; 379 380 return 0; 381} 382 383/* --------------------------------------------------------------------- */ 384 385/* XXX Should this operation be atomic? I think it should, but code in 386 * XXX other places (e.g., ufs) doesn't seem to be... */ 387int 388tmpfs_setattr(struct vop_setattr_args *v) 389{ 390 struct vnode *vp = v->a_vp; 391 struct vattr *vap = v->a_vap; 392 struct ucred *cred = v->a_cred; 393 struct thread *td = curthread; 394 395 int error; 396 397 MPASS(VOP_ISLOCKED(vp)); 398 399 error = 0; 400 401 /* Abort if any unsettable attribute is given. */ 402 if (vap->va_type != VNON || 403 vap->va_nlink != VNOVAL || 404 vap->va_fsid != VNOVAL || 405 vap->va_fileid != VNOVAL || 406 vap->va_blocksize != VNOVAL || 407 vap->va_gen != VNOVAL || 408 vap->va_rdev != VNOVAL || 409 vap->va_bytes != VNOVAL) 410 error = EINVAL; 411 412 if (error == 0 && (vap->va_flags != VNOVAL)) 413 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 414 415 if (error == 0 && (vap->va_size != VNOVAL)) 416 error = tmpfs_chsize(vp, vap->va_size, cred, td); 417 418 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 419 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 420 421 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 422 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 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 (vap->va_birthtime.tv_sec != VNOVAL && 429 vap->va_birthtime.tv_nsec != VNOVAL))) 430 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 431 &vap->va_birthtime, vap->va_vaflags, cred, td); 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); 437 438 MPASS(VOP_ISLOCKED(vp)); 439 440 return error; 441} 442 443/* --------------------------------------------------------------------- */ 444static int 445tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 446 vm_offset_t offset, size_t tlen, struct uio *uio) 447{ 448 vm_page_t m; 449 int error, rv; 450 451 VM_OBJECT_LOCK(tobj); 452 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 453 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 454 if (m->valid != VM_PAGE_BITS_ALL) { 455 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 456 rv = vm_pager_get_pages(tobj, &m, 1, 0); 457 if (rv != VM_PAGER_OK) { 458 vm_page_lock(m); 459 vm_page_free(m); 460 vm_page_unlock(m); 461 VM_OBJECT_UNLOCK(tobj); 462 return (EIO); 463 } 464 } else 465 vm_page_zero_invalid(m, TRUE); 466 } 467 VM_OBJECT_UNLOCK(tobj); 468 error = uiomove_fromphys(&m, offset, tlen, uio); 469 VM_OBJECT_LOCK(tobj); 470 vm_page_lock(m); 471 vm_page_unwire(m, TRUE); 472 vm_page_unlock(m); 473 vm_page_wakeup(m); 474 VM_OBJECT_UNLOCK(tobj); 475 476 return (error); 477} 478 479static __inline int 480tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx, 481 vm_offset_t offset, size_t tlen, void *buf) 482{ 483 struct uio uio; 484 struct iovec iov; 485 486 uio.uio_iovcnt = 1; 487 uio.uio_iov = &iov; 488 iov.iov_base = buf; 489 iov.iov_len = tlen; 490 491 uio.uio_offset = 0; 492 uio.uio_resid = tlen; 493 uio.uio_rw = UIO_READ; 494 uio.uio_segflg = UIO_SYSSPACE; 495 uio.uio_td = curthread; 496 497 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio)); 498} 499 500static int 501tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 502{ 503 struct sf_buf *sf; 504 vm_pindex_t idx; 505 vm_page_t m; 506 vm_offset_t offset; 507 off_t addr; 508 size_t tlen; 509 char *ma; 510 int error; 511 512 addr = uio->uio_offset; 513 idx = OFF_TO_IDX(addr); 514 offset = addr & PAGE_MASK; 515 tlen = MIN(PAGE_SIZE - offset, len); 516 517 if ((vobj == NULL) || 518 (vobj->resident_page_count == 0 && vobj->cache == NULL)) 519 goto nocache; 520 521 VM_OBJECT_LOCK(vobj); 522lookupvpg: 523 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 524 vm_page_is_valid(m, offset, tlen)) { 525 if ((m->oflags & VPO_BUSY) != 0) { 526 /* 527 * Reference the page before unlocking and sleeping so 528 * that the page daemon is less likely to reclaim it. 529 */ 530 vm_page_reference(m); 531 vm_page_sleep(m, "tmfsmr"); 532 goto lookupvpg; 533 } 534 vm_page_busy(m); 535 VM_OBJECT_UNLOCK(vobj); 536 error = uiomove_fromphys(&m, offset, tlen, uio); 537 VM_OBJECT_LOCK(vobj); 538 vm_page_wakeup(m); 539 VM_OBJECT_UNLOCK(vobj); 540 return (error); 541 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 542 KASSERT(offset == 0, 543 ("unexpected offset in tmpfs_mappedread for sendfile")); 544 if ((m->oflags & VPO_BUSY) != 0) { 545 /* 546 * Reference the page before unlocking and sleeping so 547 * that the page daemon is less likely to reclaim it. 548 */ 549 vm_page_reference(m); 550 vm_page_sleep(m, "tmfsmr"); 551 goto lookupvpg; 552 } 553 vm_page_busy(m); 554 VM_OBJECT_UNLOCK(vobj); 555 sched_pin(); 556 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 557 ma = (char *)sf_buf_kva(sf); 558 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 559 if (error == 0) { 560 if (tlen != PAGE_SIZE) 561 bzero(ma + tlen, PAGE_SIZE - tlen); 562 uio->uio_offset += tlen; 563 uio->uio_resid -= tlen; 564 } 565 sf_buf_free(sf); 566 sched_unpin(); 567 VM_OBJECT_LOCK(vobj); 568 if (error == 0) 569 m->valid = VM_PAGE_BITS_ALL; 570 vm_page_wakeup(m); 571 VM_OBJECT_UNLOCK(vobj); 572 return (error); 573 } 574 VM_OBJECT_UNLOCK(vobj); 575nocache: 576 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 577 578 return (error); 579} 580 581static int 582tmpfs_read(struct vop_read_args *v) 583{ 584 struct vnode *vp = v->a_vp; 585 struct uio *uio = v->a_uio; 586 587 struct tmpfs_node *node; 588 vm_object_t uobj; 589 size_t len; 590 int resid; 591 592 int error = 0; 593 594 node = VP_TO_TMPFS_NODE(vp); 595 596 if (vp->v_type != VREG) { 597 error = EISDIR; 598 goto out; 599 } 600 601 if (uio->uio_offset < 0) { 602 error = EINVAL; 603 goto out; 604 } 605 606 node->tn_status |= TMPFS_NODE_ACCESSED; 607 608 uobj = node->tn_reg.tn_aobj; 609 while ((resid = uio->uio_resid) > 0) { 610 error = 0; 611 if (node->tn_size <= uio->uio_offset) 612 break; 613 len = MIN(node->tn_size - uio->uio_offset, resid); 614 if (len == 0) 615 break; 616 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 617 if ((error != 0) || (resid == uio->uio_resid)) 618 break; 619 } 620 621out: 622 623 return error; 624} 625 626/* --------------------------------------------------------------------- */ 627 628static int 629tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 630{ 631 vm_pindex_t idx; 632 vm_page_t vpg, tpg; 633 vm_offset_t offset; 634 off_t addr; 635 size_t tlen; 636 int error, rv; 637 638 error = 0; 639 640 addr = uio->uio_offset; 641 idx = OFF_TO_IDX(addr); 642 offset = addr & PAGE_MASK; 643 tlen = MIN(PAGE_SIZE - offset, len); 644 645 if ((vobj == NULL) || 646 (vobj->resident_page_count == 0 && vobj->cache == NULL)) { 647 vpg = NULL; 648 goto nocache; 649 } 650 651 VM_OBJECT_LOCK(vobj); 652lookupvpg: 653 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 654 vm_page_is_valid(vpg, offset, tlen)) { 655 if ((vpg->oflags & VPO_BUSY) != 0) { 656 /* 657 * Reference the page before unlocking and sleeping so 658 * that the page daemon is less likely to reclaim it. 659 */ 660 vm_page_reference(vpg); 661 vm_page_sleep(vpg, "tmfsmw"); 662 goto lookupvpg; 663 } 664 vm_page_busy(vpg); 665 vm_page_undirty(vpg); 666 VM_OBJECT_UNLOCK(vobj); 667 error = uiomove_fromphys(&vpg, offset, tlen, uio); 668 } else { 669 if (__predict_false(vobj->cache != NULL)) 670 vm_page_cache_free(vobj, idx, idx + 1); 671 VM_OBJECT_UNLOCK(vobj); 672 vpg = NULL; 673 } 674nocache: 675 VM_OBJECT_LOCK(tobj); 676 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 677 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 678 if (tpg->valid != VM_PAGE_BITS_ALL) { 679 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 680 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 681 if (rv != VM_PAGER_OK) { 682 vm_page_lock(tpg); 683 vm_page_free(tpg); 684 vm_page_unlock(tpg); 685 error = EIO; 686 goto out; 687 } 688 } else 689 vm_page_zero_invalid(tpg, TRUE); 690 } 691 VM_OBJECT_UNLOCK(tobj); 692 if (vpg == NULL) 693 error = uiomove_fromphys(&tpg, offset, tlen, uio); 694 else { 695 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 696 pmap_copy_page(vpg, tpg); 697 } 698 VM_OBJECT_LOCK(tobj); 699 if (error == 0) { 700 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 701 ("parts of tpg invalid")); 702 vm_page_dirty(tpg); 703 } 704 vm_page_lock(tpg); 705 vm_page_unwire(tpg, TRUE); 706 vm_page_unlock(tpg); 707 vm_page_wakeup(tpg); 708out: 709 VM_OBJECT_UNLOCK(tobj); 710 if (vpg != NULL) { 711 VM_OBJECT_LOCK(vobj); 712 vm_page_wakeup(vpg); 713 VM_OBJECT_UNLOCK(vobj); 714 } 715 716 return (error); 717} 718 719static int 720tmpfs_write(struct vop_write_args *v) 721{ 722 struct vnode *vp = v->a_vp; 723 struct uio *uio = v->a_uio; 724 int ioflag = v->a_ioflag; 725 726 boolean_t extended; 727 int error = 0; 728 off_t oldsize; 729 struct tmpfs_node *node; 730 vm_object_t uobj; 731 size_t len; 732 int resid; 733 734 node = VP_TO_TMPFS_NODE(vp); 735 oldsize = node->tn_size; 736 737 if (uio->uio_offset < 0 || vp->v_type != VREG) { 738 error = EINVAL; 739 goto out; 740 } 741 742 if (uio->uio_resid == 0) { 743 error = 0; 744 goto out; 745 } 746 747 if (ioflag & IO_APPEND) 748 uio->uio_offset = node->tn_size; 749 750 if (uio->uio_offset + uio->uio_resid > 751 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 752 return (EFBIG); 753 754 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 755 return (EFBIG); 756 757 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 758 if (extended) { 759 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 760 FALSE); 761 if (error != 0) 762 goto out; 763 } 764 765 uobj = node->tn_reg.tn_aobj; 766 while ((resid = uio->uio_resid) > 0) { 767 if (node->tn_size <= uio->uio_offset) 768 break; 769 len = MIN(node->tn_size - uio->uio_offset, resid); 770 if (len == 0) 771 break; 772 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 773 if ((error != 0) || (resid == uio->uio_resid)) 774 break; 775 } 776 777 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 778 (extended ? TMPFS_NODE_CHANGED : 0); 779 780 if (node->tn_mode & (S_ISUID | S_ISGID)) { 781 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 782 node->tn_mode &= ~(S_ISUID | S_ISGID); 783 } 784 785 if (error != 0) 786 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 787 788out: 789 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 790 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 791 792 return error; 793} 794 795/* --------------------------------------------------------------------- */ 796 797static int 798tmpfs_fsync(struct vop_fsync_args *v) 799{ 800 struct vnode *vp = v->a_vp; 801 802 MPASS(VOP_ISLOCKED(vp)); 803 804 tmpfs_update(vp); 805 806 return 0; 807} 808 809/* --------------------------------------------------------------------- */ 810 811static int 812tmpfs_remove(struct vop_remove_args *v) 813{ 814 struct vnode *dvp = v->a_dvp; 815 struct vnode *vp = v->a_vp; 816 817 int error; 818 struct tmpfs_dirent *de; 819 struct tmpfs_mount *tmp; 820 struct tmpfs_node *dnode; 821 struct tmpfs_node *node; 822 823 MPASS(VOP_ISLOCKED(dvp)); 824 MPASS(VOP_ISLOCKED(vp)); 825 826 if (vp->v_type == VDIR) { 827 error = EISDIR; 828 goto out; 829 } 830 831 dnode = VP_TO_TMPFS_DIR(dvp); 832 node = VP_TO_TMPFS_NODE(vp); 833 tmp = VFS_TO_TMPFS(vp->v_mount); 834 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 835 MPASS(de != NULL); 836 837 /* Files marked as immutable or append-only cannot be deleted. */ 838 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 839 (dnode->tn_flags & APPEND)) { 840 error = EPERM; 841 goto out; 842 } 843 844 /* Remove the entry from the directory; as it is a file, we do not 845 * have to change the number of hard links of the directory. */ 846 tmpfs_dir_detach(dvp, de); 847 if (v->a_cnp->cn_flags & DOWHITEOUT) 848 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 849 850 /* Free the directory entry we just deleted. Note that the node 851 * referred by it will not be removed until the vnode is really 852 * reclaimed. */ 853 tmpfs_free_dirent(tmp, de, TRUE); 854 855 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 856 error = 0; 857 858out: 859 860 return error; 861} 862 863/* --------------------------------------------------------------------- */ 864 865static int 866tmpfs_link(struct vop_link_args *v) 867{ 868 struct vnode *dvp = v->a_tdvp; 869 struct vnode *vp = v->a_vp; 870 struct componentname *cnp = v->a_cnp; 871 872 int error; 873 struct tmpfs_dirent *de; 874 struct tmpfs_node *node; 875 876 MPASS(VOP_ISLOCKED(dvp)); 877 MPASS(cnp->cn_flags & HASBUF); 878 MPASS(dvp != vp); /* XXX When can this be false? */ 879 880 node = VP_TO_TMPFS_NODE(vp); 881 882 /* XXX: Why aren't the following two tests done by the caller? */ 883 884 /* Hard links of directories are forbidden. */ 885 if (vp->v_type == VDIR) { 886 error = EPERM; 887 goto out; 888 } 889 890 /* Cannot create cross-device links. */ 891 if (dvp->v_mount != vp->v_mount) { 892 error = EXDEV; 893 goto out; 894 } 895 896 /* Ensure that we do not overflow the maximum number of links imposed 897 * by the system. */ 898 MPASS(node->tn_links <= LINK_MAX); 899 if (node->tn_links == LINK_MAX) { 900 error = EMLINK; 901 goto out; 902 } 903 904 /* We cannot create links of files marked immutable or append-only. */ 905 if (node->tn_flags & (IMMUTABLE | APPEND)) { 906 error = EPERM; 907 goto out; 908 } 909 910 /* Allocate a new directory entry to represent the node. */ 911 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 912 cnp->cn_nameptr, cnp->cn_namelen, &de); 913 if (error != 0) 914 goto out; 915 916 /* Insert the new directory entry into the appropriate directory. */ 917 if (cnp->cn_flags & ISWHITEOUT) 918 tmpfs_dir_whiteout_remove(dvp, cnp); 919 tmpfs_dir_attach(dvp, de); 920 921 /* vp link count has changed, so update node times. */ 922 node->tn_status |= TMPFS_NODE_CHANGED; 923 tmpfs_update(vp); 924 925 error = 0; 926 927out: 928 return error; 929} 930 931/* --------------------------------------------------------------------- */ 932 933/* 934 * We acquire all but fdvp locks using non-blocking acquisitions. If we 935 * fail to acquire any lock in the path we will drop all held locks, 936 * acquire the new lock in a blocking fashion, and then release it and 937 * restart the rename. This acquire/release step ensures that we do not 938 * spin on a lock waiting for release. On error release all vnode locks 939 * and decrement references the way tmpfs_rename() would do. 940 */ 941static int 942tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 943 struct vnode *tdvp, struct vnode **tvpp, 944 struct componentname *fcnp, struct componentname *tcnp) 945{ 946 struct vnode *nvp; 947 struct mount *mp; 948 struct tmpfs_dirent *de; 949 int error, restarts = 0; 950 951 VOP_UNLOCK(tdvp, 0); 952 if (*tvpp != NULL && *tvpp != tdvp) 953 VOP_UNLOCK(*tvpp, 0); 954 mp = fdvp->v_mount; 955 956relock: 957 restarts += 1; 958 error = vn_lock(fdvp, LK_EXCLUSIVE); 959 if (error) 960 goto releout; 961 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 962 VOP_UNLOCK(fdvp, 0); 963 error = vn_lock(tdvp, LK_EXCLUSIVE); 964 if (error) 965 goto releout; 966 VOP_UNLOCK(tdvp, 0); 967 goto relock; 968 } 969 /* 970 * Re-resolve fvp to be certain it still exists and fetch the 971 * correct vnode. 972 */ 973 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 974 if (de == NULL) { 975 VOP_UNLOCK(fdvp, 0); 976 VOP_UNLOCK(tdvp, 0); 977 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 978 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 979 error = EINVAL; 980 else 981 error = ENOENT; 982 goto releout; 983 } 984 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 985 if (error != 0) { 986 VOP_UNLOCK(fdvp, 0); 987 VOP_UNLOCK(tdvp, 0); 988 if (error != EBUSY) 989 goto releout; 990 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 991 if (error != 0) 992 goto releout; 993 VOP_UNLOCK(nvp, 0); 994 /* 995 * Concurrent rename race. 996 */ 997 if (nvp == tdvp) { 998 vrele(nvp); 999 error = EINVAL; 1000 goto releout; 1001 } 1002 vrele(*fvpp); 1003 *fvpp = nvp; 1004 goto relock; 1005 } 1006 vrele(*fvpp); 1007 *fvpp = nvp; 1008 VOP_UNLOCK(*fvpp, 0); 1009 /* 1010 * Re-resolve tvp and acquire the vnode lock if present. 1011 */ 1012 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 1013 /* 1014 * If tvp disappeared we just carry on. 1015 */ 1016 if (de == NULL && *tvpp != NULL) { 1017 vrele(*tvpp); 1018 *tvpp = NULL; 1019 } 1020 /* 1021 * Get the tvp ino if the lookup succeeded. We may have to restart 1022 * if the non-blocking acquire fails. 1023 */ 1024 if (de != NULL) { 1025 nvp = NULL; 1026 error = tmpfs_alloc_vp(mp, de->td_node, 1027 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 1028 if (*tvpp != NULL) 1029 vrele(*tvpp); 1030 *tvpp = nvp; 1031 if (error != 0) { 1032 VOP_UNLOCK(fdvp, 0); 1033 VOP_UNLOCK(tdvp, 0); 1034 if (error != EBUSY) 1035 goto releout; 1036 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 1037 &nvp); 1038 if (error != 0) 1039 goto releout; 1040 VOP_UNLOCK(nvp, 0); 1041 /* 1042 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 1043 */ 1044 if (nvp == fdvp) { 1045 error = ENOTEMPTY; 1046 goto releout; 1047 } 1048 goto relock; 1049 } 1050 } 1051 tmpfs_rename_restarts += restarts; 1052 1053 return (0); 1054 1055releout: 1056 vrele(fdvp); 1057 vrele(*fvpp); 1058 vrele(tdvp); 1059 if (*tvpp != NULL) 1060 vrele(*tvpp); 1061 tmpfs_rename_restarts += restarts; 1062 1063 return (error); 1064} 1065 1066static int 1067tmpfs_rename(struct vop_rename_args *v) 1068{ 1069 struct vnode *fdvp = v->a_fdvp; 1070 struct vnode *fvp = v->a_fvp; 1071 struct componentname *fcnp = v->a_fcnp; 1072 struct vnode *tdvp = v->a_tdvp; 1073 struct vnode *tvp = v->a_tvp; 1074 struct componentname *tcnp = v->a_tcnp; 1075 struct mount *mp = NULL; 1076 1077 char *newname; 1078 int error; 1079 struct tmpfs_dirent *de; 1080 struct tmpfs_mount *tmp; 1081 struct tmpfs_node *fdnode; 1082 struct tmpfs_node *fnode; 1083 struct tmpfs_node *tnode; 1084 struct tmpfs_node *tdnode; 1085 1086 MPASS(VOP_ISLOCKED(tdvp)); 1087 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 1088 MPASS(fcnp->cn_flags & HASBUF); 1089 MPASS(tcnp->cn_flags & HASBUF); 1090 1091 /* Disallow cross-device renames. 1092 * XXX Why isn't this done by the caller? */ 1093 if (fvp->v_mount != tdvp->v_mount || 1094 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1095 error = EXDEV; 1096 goto out; 1097 } 1098 1099 /* If source and target are the same file, there is nothing to do. */ 1100 if (fvp == tvp) { 1101 error = 0; 1102 goto out; 1103 } 1104 1105 /* If we need to move the directory between entries, lock the 1106 * source so that we can safely operate on it. */ 1107 if (fdvp != tdvp && fdvp != tvp) { 1108 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1109 mp = tdvp->v_mount; 1110 error = vfs_busy(mp, 0); 1111 if (error != 0) { 1112 mp = NULL; 1113 goto out; 1114 } 1115 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1116 fcnp, tcnp); 1117 if (error != 0) { 1118 vfs_unbusy(mp); 1119 return (error); 1120 } 1121 ASSERT_VOP_ELOCKED(fdvp, 1122 "tmpfs_rename: fdvp not locked"); 1123 ASSERT_VOP_ELOCKED(tdvp, 1124 "tmpfs_rename: tdvp not locked"); 1125 if (tvp != NULL) 1126 ASSERT_VOP_ELOCKED(tvp, 1127 "tmpfs_rename: tvp not locked"); 1128 if (fvp == tvp) { 1129 error = 0; 1130 goto out_locked; 1131 } 1132 } 1133 } 1134 1135 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1136 tdnode = VP_TO_TMPFS_DIR(tdvp); 1137 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1138 fdnode = VP_TO_TMPFS_DIR(fdvp); 1139 fnode = VP_TO_TMPFS_NODE(fvp); 1140 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1141 1142 /* Entry can disappear before we lock fdvp, 1143 * also avoid manipulating '.' and '..' entries. */ 1144 if (de == NULL) { 1145 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1146 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1147 error = EINVAL; 1148 else 1149 error = ENOENT; 1150 goto out_locked; 1151 } 1152 MPASS(de->td_node == fnode); 1153 1154 /* If re-naming a directory to another preexisting directory 1155 * ensure that the target directory is empty so that its 1156 * removal causes no side effects. 1157 * Kern_rename gurantees the destination to be a directory 1158 * if the source is one. */ 1159 if (tvp != NULL) { 1160 MPASS(tnode != NULL); 1161 1162 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1163 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1164 error = EPERM; 1165 goto out_locked; 1166 } 1167 1168 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1169 if (tnode->tn_size > 0) { 1170 error = ENOTEMPTY; 1171 goto out_locked; 1172 } 1173 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1174 error = ENOTDIR; 1175 goto out_locked; 1176 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1177 error = EISDIR; 1178 goto out_locked; 1179 } else { 1180 MPASS(fnode->tn_type != VDIR && 1181 tnode->tn_type != VDIR); 1182 } 1183 } 1184 1185 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1186 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1187 error = EPERM; 1188 goto out_locked; 1189 } 1190 1191 /* Ensure that we have enough memory to hold the new name, if it 1192 * has to be changed. */ 1193 if (fcnp->cn_namelen != tcnp->cn_namelen || 1194 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1195 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1196 } else 1197 newname = NULL; 1198 1199 /* If the node is being moved to another directory, we have to do 1200 * the move. */ 1201 if (fdnode != tdnode) { 1202 /* In case we are moving a directory, we have to adjust its 1203 * parent to point to the new parent. */ 1204 if (de->td_node->tn_type == VDIR) { 1205 struct tmpfs_node *n; 1206 1207 /* Ensure the target directory is not a child of the 1208 * directory being moved. Otherwise, we'd end up 1209 * with stale nodes. */ 1210 n = tdnode; 1211 /* TMPFS_LOCK garanties that no nodes are freed while 1212 * traversing the list. Nodes can only be marked as 1213 * removed: tn_parent == NULL. */ 1214 TMPFS_LOCK(tmp); 1215 TMPFS_NODE_LOCK(n); 1216 while (n != n->tn_dir.tn_parent) { 1217 struct tmpfs_node *parent; 1218 1219 if (n == fnode) { 1220 TMPFS_NODE_UNLOCK(n); 1221 TMPFS_UNLOCK(tmp); 1222 error = EINVAL; 1223 if (newname != NULL) 1224 free(newname, M_TMPFSNAME); 1225 goto out_locked; 1226 } 1227 parent = n->tn_dir.tn_parent; 1228 TMPFS_NODE_UNLOCK(n); 1229 if (parent == NULL) { 1230 n = NULL; 1231 break; 1232 } 1233 TMPFS_NODE_LOCK(parent); 1234 if (parent->tn_dir.tn_parent == NULL) { 1235 TMPFS_NODE_UNLOCK(parent); 1236 n = NULL; 1237 break; 1238 } 1239 n = parent; 1240 } 1241 TMPFS_UNLOCK(tmp); 1242 if (n == NULL) { 1243 error = EINVAL; 1244 if (newname != NULL) 1245 free(newname, M_TMPFSNAME); 1246 goto out_locked; 1247 } 1248 TMPFS_NODE_UNLOCK(n); 1249 1250 /* Adjust the parent pointer. */ 1251 TMPFS_VALIDATE_DIR(fnode); 1252 TMPFS_NODE_LOCK(de->td_node); 1253 de->td_node->tn_dir.tn_parent = tdnode; 1254 TMPFS_NODE_UNLOCK(de->td_node); 1255 1256 /* As a result of changing the target of the '..' 1257 * entry, the link count of the source and target 1258 * directories has to be adjusted. */ 1259 TMPFS_NODE_LOCK(tdnode); 1260 TMPFS_ASSERT_LOCKED(tdnode); 1261 tdnode->tn_links++; 1262 TMPFS_NODE_UNLOCK(tdnode); 1263 1264 TMPFS_NODE_LOCK(fdnode); 1265 TMPFS_ASSERT_LOCKED(fdnode); 1266 fdnode->tn_links--; 1267 TMPFS_NODE_UNLOCK(fdnode); 1268 } 1269 1270 /* Do the move: just remove the entry from the source directory 1271 * and insert it into the target one. */ 1272 tmpfs_dir_detach(fdvp, de); 1273 if (fcnp->cn_flags & DOWHITEOUT) 1274 tmpfs_dir_whiteout_add(fdvp, fcnp); 1275 if (tcnp->cn_flags & ISWHITEOUT) 1276 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1277 tmpfs_dir_attach(tdvp, de); 1278 } 1279 1280 /* If the name has changed, we need to make it effective by changing 1281 * it in the directory entry. */ 1282 if (newname != NULL) { 1283 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1284 1285 free(de->td_name, M_TMPFSNAME); 1286 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1287 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1288 de->td_name = newname; 1289 1290 fnode->tn_status |= TMPFS_NODE_CHANGED; 1291 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1292 } 1293 1294 /* If we are overwriting an entry, we have to remove the old one 1295 * from the target directory. */ 1296 if (tvp != NULL) { 1297 /* Remove the old entry from the target directory. */ 1298 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1299 tmpfs_dir_detach(tdvp, de); 1300 1301 /* Free the directory entry we just deleted. Note that the 1302 * node referred by it will not be removed until the vnode is 1303 * really reclaimed. */ 1304 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1305 } 1306 cache_purge(fvp); 1307 if (tvp != NULL) 1308 cache_purge(tvp); 1309 cache_purge_negative(tdvp); 1310 1311 error = 0; 1312 1313out_locked: 1314 if (fdvp != tdvp && fdvp != tvp) 1315 VOP_UNLOCK(fdvp, 0); 1316 1317out: 1318 /* Release target nodes. */ 1319 /* XXX: I don't understand when tdvp can be the same as tvp, but 1320 * other code takes care of this... */ 1321 if (tdvp == tvp) 1322 vrele(tdvp); 1323 else 1324 vput(tdvp); 1325 if (tvp != NULL) 1326 vput(tvp); 1327 1328 /* Release source nodes. */ 1329 vrele(fdvp); 1330 vrele(fvp); 1331 1332 if (mp != NULL) 1333 vfs_unbusy(mp); 1334 1335 return error; 1336} 1337 1338/* --------------------------------------------------------------------- */ 1339 1340static int 1341tmpfs_mkdir(struct vop_mkdir_args *v) 1342{ 1343 struct vnode *dvp = v->a_dvp; 1344 struct vnode **vpp = v->a_vpp; 1345 struct componentname *cnp = v->a_cnp; 1346 struct vattr *vap = v->a_vap; 1347 1348 MPASS(vap->va_type == VDIR); 1349 1350 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1351} 1352 1353/* --------------------------------------------------------------------- */ 1354 1355static int 1356tmpfs_rmdir(struct vop_rmdir_args *v) 1357{ 1358 struct vnode *dvp = v->a_dvp; 1359 struct vnode *vp = v->a_vp; 1360 1361 int error; 1362 struct tmpfs_dirent *de; 1363 struct tmpfs_mount *tmp; 1364 struct tmpfs_node *dnode; 1365 struct tmpfs_node *node; 1366 1367 MPASS(VOP_ISLOCKED(dvp)); 1368 MPASS(VOP_ISLOCKED(vp)); 1369 1370 tmp = VFS_TO_TMPFS(dvp->v_mount); 1371 dnode = VP_TO_TMPFS_DIR(dvp); 1372 node = VP_TO_TMPFS_DIR(vp); 1373 1374 /* Directories with more than two entries ('.' and '..') cannot be 1375 * removed. */ 1376 if (node->tn_size > 0) { 1377 error = ENOTEMPTY; 1378 goto out; 1379 } 1380 1381 if ((dnode->tn_flags & APPEND) 1382 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1383 error = EPERM; 1384 goto out; 1385 } 1386 1387 /* This invariant holds only if we are not trying to remove "..". 1388 * We checked for that above so this is safe now. */ 1389 MPASS(node->tn_dir.tn_parent == dnode); 1390 1391 /* Get the directory entry associated with node (vp). This was 1392 * filled by tmpfs_lookup while looking up the entry. */ 1393 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1394 MPASS(TMPFS_DIRENT_MATCHES(de, 1395 v->a_cnp->cn_nameptr, 1396 v->a_cnp->cn_namelen)); 1397 1398 /* Check flags to see if we are allowed to remove the directory. */ 1399 if (dnode->tn_flags & APPEND 1400 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1401 error = EPERM; 1402 goto out; 1403 } 1404 1405 1406 /* Detach the directory entry from the directory (dnode). */ 1407 tmpfs_dir_detach(dvp, de); 1408 if (v->a_cnp->cn_flags & DOWHITEOUT) 1409 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1410 1411 /* No vnode should be allocated for this entry from this point */ 1412 TMPFS_NODE_LOCK(node); 1413 TMPFS_ASSERT_ELOCKED(node); 1414 node->tn_links--; 1415 node->tn_dir.tn_parent = NULL; 1416 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1417 TMPFS_NODE_MODIFIED; 1418 1419 TMPFS_NODE_UNLOCK(node); 1420 1421 TMPFS_NODE_LOCK(dnode); 1422 TMPFS_ASSERT_ELOCKED(dnode); 1423 dnode->tn_links--; 1424 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1425 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1426 TMPFS_NODE_UNLOCK(dnode); 1427 1428 cache_purge(dvp); 1429 cache_purge(vp); 1430 1431 /* Free the directory entry we just deleted. Note that the node 1432 * referred by it will not be removed until the vnode is really 1433 * reclaimed. */ 1434 tmpfs_free_dirent(tmp, de, TRUE); 1435 1436 /* Release the deleted vnode (will destroy the node, notify 1437 * interested parties and clean it from the cache). */ 1438 1439 dnode->tn_status |= TMPFS_NODE_CHANGED; 1440 tmpfs_update(dvp); 1441 1442 error = 0; 1443 1444out: 1445 return error; 1446} 1447 1448/* --------------------------------------------------------------------- */ 1449 1450static int 1451tmpfs_symlink(struct vop_symlink_args *v) 1452{ 1453 struct vnode *dvp = v->a_dvp; 1454 struct vnode **vpp = v->a_vpp; 1455 struct componentname *cnp = v->a_cnp; 1456 struct vattr *vap = v->a_vap; 1457 char *target = v->a_target; 1458 1459#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1460 MPASS(vap->va_type == VLNK); 1461#else 1462 vap->va_type = VLNK; 1463#endif 1464 1465 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1466} 1467 1468/* --------------------------------------------------------------------- */ 1469 1470static int 1471tmpfs_readdir(struct vop_readdir_args *v) 1472{ 1473 struct vnode *vp = v->a_vp; 1474 struct uio *uio = v->a_uio; 1475 int *eofflag = v->a_eofflag; 1476 u_long **cookies = v->a_cookies; 1477 int *ncookies = v->a_ncookies; 1478 1479 int error; 1480 off_t startoff; 1481 off_t cnt = 0; 1482 struct tmpfs_node *node; 1483 1484 /* This operation only makes sense on directory nodes. */ 1485 if (vp->v_type != VDIR) 1486 return ENOTDIR; 1487 1488 node = VP_TO_TMPFS_DIR(vp); 1489 1490 startoff = uio->uio_offset; 1491 1492 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1493 error = tmpfs_dir_getdotdent(node, uio); 1494 if (error != 0) 1495 goto outok; 1496 cnt++; 1497 } 1498 1499 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1500 error = tmpfs_dir_getdotdotdent(node, uio); 1501 if (error != 0) 1502 goto outok; 1503 cnt++; 1504 } 1505 1506 error = tmpfs_dir_getdents(node, uio, &cnt); 1507 1508outok: 1509 MPASS(error >= -1); 1510 1511 if (error == -1) 1512 error = (cnt != 0) ? 0 : EINVAL; 1513 1514 if (eofflag != NULL) 1515 *eofflag = 1516 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1517 1518 /* Update NFS-related variables. */ 1519 if (error == 0 && cookies != NULL && ncookies != NULL) { 1520 off_t i; 1521 off_t off = startoff; 1522 struct tmpfs_dirent *de = NULL; 1523 1524 *ncookies = cnt; 1525 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1526 1527 for (i = 0; i < cnt; i++) { 1528 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1529 if (off == TMPFS_DIRCOOKIE_DOT) { 1530 off = TMPFS_DIRCOOKIE_DOTDOT; 1531 } else { 1532 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1533 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1534 } else if (de != NULL) { 1535 de = TAILQ_NEXT(de, td_entries); 1536 } else { 1537 de = tmpfs_dir_lookupbycookie(node, 1538 off); 1539 MPASS(de != NULL); 1540 de = TAILQ_NEXT(de, td_entries); 1541 } 1542 if (de == NULL) 1543 off = TMPFS_DIRCOOKIE_EOF; 1544 else 1545 off = tmpfs_dircookie(de); 1546 } 1547 1548 (*cookies)[i] = off; 1549 } 1550 MPASS(uio->uio_offset == off); 1551 } 1552 1553 return error; 1554} 1555 1556/* --------------------------------------------------------------------- */ 1557 1558static int 1559tmpfs_readlink(struct vop_readlink_args *v) 1560{ 1561 struct vnode *vp = v->a_vp; 1562 struct uio *uio = v->a_uio; 1563 1564 int error; 1565 struct tmpfs_node *node; 1566 1567 MPASS(uio->uio_offset == 0); 1568 MPASS(vp->v_type == VLNK); 1569 1570 node = VP_TO_TMPFS_NODE(vp); 1571 1572 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1573 uio); 1574 node->tn_status |= TMPFS_NODE_ACCESSED; 1575 1576 return error; 1577} 1578 1579/* --------------------------------------------------------------------- */ 1580 1581static int 1582tmpfs_inactive(struct vop_inactive_args *v) 1583{ 1584 struct vnode *vp = v->a_vp; 1585 struct thread *l = v->a_td; 1586 1587 struct tmpfs_node *node; 1588 1589 MPASS(VOP_ISLOCKED(vp)); 1590 1591 node = VP_TO_TMPFS_NODE(vp); 1592 1593 if (node->tn_links == 0) 1594 vrecycle(vp, l); 1595 1596 return 0; 1597} 1598 1599/* --------------------------------------------------------------------- */ 1600 1601int 1602tmpfs_reclaim(struct vop_reclaim_args *v) 1603{ 1604 struct vnode *vp = v->a_vp; 1605 1606 struct tmpfs_mount *tmp; 1607 struct tmpfs_node *node; 1608 1609 node = VP_TO_TMPFS_NODE(vp); 1610 tmp = VFS_TO_TMPFS(vp->v_mount); 1611 1612 vnode_destroy_vobject(vp); 1613 cache_purge(vp); 1614 1615 TMPFS_NODE_LOCK(node); 1616 TMPFS_ASSERT_ELOCKED(node); 1617 tmpfs_free_vp(vp); 1618 1619 /* If the node referenced by this vnode was deleted by the user, 1620 * we must free its associated data structures (now that the vnode 1621 * is being reclaimed). */ 1622 if (node->tn_links == 0 && 1623 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1624 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1625 TMPFS_NODE_UNLOCK(node); 1626 tmpfs_free_node(tmp, node); 1627 } else 1628 TMPFS_NODE_UNLOCK(node); 1629 1630 MPASS(vp->v_data == NULL); 1631 return 0; 1632} 1633 1634/* --------------------------------------------------------------------- */ 1635 1636static int 1637tmpfs_print(struct vop_print_args *v) 1638{ 1639 struct vnode *vp = v->a_vp; 1640 1641 struct tmpfs_node *node; 1642 1643 node = VP_TO_TMPFS_NODE(vp); 1644 1645 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1646 node, node->tn_flags, node->tn_links); 1647 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1648 ", status 0x%x\n", 1649 node->tn_mode, node->tn_uid, node->tn_gid, 1650 (uintmax_t)node->tn_size, node->tn_status); 1651 1652 if (vp->v_type == VFIFO) 1653 fifo_printinfo(vp); 1654 1655 printf("\n"); 1656 1657 return 0; 1658} 1659 1660/* --------------------------------------------------------------------- */ 1661 1662static int 1663tmpfs_pathconf(struct vop_pathconf_args *v) 1664{ 1665 int name = v->a_name; 1666 register_t *retval = v->a_retval; 1667 1668 int error; 1669 1670 error = 0; 1671 1672 switch (name) { 1673 case _PC_LINK_MAX: 1674 *retval = LINK_MAX; 1675 break; 1676 1677 case _PC_NAME_MAX: 1678 *retval = NAME_MAX; 1679 break; 1680 1681 case _PC_PATH_MAX: 1682 *retval = PATH_MAX; 1683 break; 1684 1685 case _PC_PIPE_BUF: 1686 *retval = PIPE_BUF; 1687 break; 1688 1689 case _PC_CHOWN_RESTRICTED: 1690 *retval = 1; 1691 break; 1692 1693 case _PC_NO_TRUNC: 1694 *retval = 1; 1695 break; 1696 1697 case _PC_SYNC_IO: 1698 *retval = 1; 1699 break; 1700 1701 case _PC_FILESIZEBITS: 1702 *retval = 0; /* XXX Don't know which value should I return. */ 1703 break; 1704 1705 default: 1706 error = EINVAL; 1707 } 1708 1709 return error; 1710} 1711 1712static int 1713tmpfs_vptofh(struct vop_vptofh_args *ap) 1714{ 1715 struct tmpfs_fid *tfhp; 1716 struct tmpfs_node *node; 1717 1718 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1719 node = VP_TO_TMPFS_NODE(ap->a_vp); 1720 1721 tfhp->tf_len = sizeof(struct tmpfs_fid); 1722 tfhp->tf_id = node->tn_id; 1723 tfhp->tf_gen = node->tn_gen; 1724 1725 return (0); 1726} 1727 1728static int 1729tmpfs_whiteout(struct vop_whiteout_args *ap) 1730{ 1731 struct vnode *dvp = ap->a_dvp; 1732 struct componentname *cnp = ap->a_cnp; 1733 struct tmpfs_dirent *de; 1734 1735 switch (ap->a_flags) { 1736 case LOOKUP: 1737 return (0); 1738 case CREATE: 1739 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1740 if (de != NULL) 1741 return (de->td_node == NULL ? 0 : EEXIST); 1742 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1743 case DELETE: 1744 tmpfs_dir_whiteout_remove(dvp, cnp); 1745 return (0); 1746 default: 1747 panic("tmpfs_whiteout: unknown op"); 1748 } 1749} 1750 1751/* --------------------------------------------------------------------- */ 1752 1753/* 1754 * vnode operations vector used for files stored in a tmpfs file system. 1755 */ 1756struct vop_vector tmpfs_vnodeop_entries = { 1757 .vop_default = &default_vnodeops, 1758 .vop_lookup = vfs_cache_lookup, 1759 .vop_cachedlookup = tmpfs_lookup, 1760 .vop_create = tmpfs_create, 1761 .vop_mknod = tmpfs_mknod, 1762 .vop_open = tmpfs_open, 1763 .vop_close = tmpfs_close, 1764 .vop_access = tmpfs_access, 1765 .vop_getattr = tmpfs_getattr, 1766 .vop_setattr = tmpfs_setattr, 1767 .vop_read = tmpfs_read, 1768 .vop_write = tmpfs_write, 1769 .vop_fsync = tmpfs_fsync, 1770 .vop_remove = tmpfs_remove, 1771 .vop_link = tmpfs_link, 1772 .vop_rename = tmpfs_rename, 1773 .vop_mkdir = tmpfs_mkdir, 1774 .vop_rmdir = tmpfs_rmdir, 1775 .vop_symlink = tmpfs_symlink, 1776 .vop_readdir = tmpfs_readdir, 1777 .vop_readlink = tmpfs_readlink, 1778 .vop_inactive = tmpfs_inactive, 1779 .vop_reclaim = tmpfs_reclaim, 1780 .vop_print = tmpfs_print, 1781 .vop_pathconf = tmpfs_pathconf, 1782 .vop_vptofh = tmpfs_vptofh, 1783 .vop_whiteout = tmpfs_whiteout, 1784 .vop_bmap = VOP_EOPNOTSUPP, 1785}; 1786 1787