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sys/fs/tmpfs/tmpfs_vnops.c
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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: releng/8.4/sys/fs/tmpfs/tmpfs_vnops.c 248833 2013-03-28 15:04:03Z kib $"); 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_object.h> 55 #include <vm/vm_page.h> 56 #include <vm/vm_pager.h> 57 58 #include <machine/_inttypes.h> 59 60 #include <fs/fifofs/fifo.h> 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 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; 449 450 VM_OBJECT_LOCK(tobj); 451 vm_object_pip_add(tobj, 1); 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 error = vm_pager_get_pages(tobj, &m, 1, 0); 457 if (error != 0) { 458 printf("tmpfs get pages from pager error [read]\n"); 459 goto out; 460 } 461 } else 462 vm_page_zero_invalid(m, TRUE); 463 } 464 VM_OBJECT_UNLOCK(tobj); 465 error = uiomove_fromphys(&m, offset, tlen, uio); 466 VM_OBJECT_LOCK(tobj); 467 out: 468 vm_page_lock_queues(); 469 vm_page_unwire(m, TRUE); 470 vm_page_unlock_queues(); 471 vm_page_wakeup(m); 472 vm_object_pip_subtract(tobj, 1); 473 VM_OBJECT_UNLOCK(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 if ((vobj == NULL) || (vobj->resident_page_count == 0)) 517 goto nocache; 518 519 VM_OBJECT_LOCK(vobj); 520 lookupvpg: 521 if (((m = vm_page_lookup(vobj, idx)) != NULL) && 522 vm_page_is_valid(m, offset, tlen)) { 523 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 524 goto lookupvpg; 525 vm_page_busy(m); 526 VM_OBJECT_UNLOCK(vobj); 527 error = uiomove_fromphys(&m, offset, tlen, uio); 528 VM_OBJECT_LOCK(vobj); 529 vm_page_wakeup(m); 530 VM_OBJECT_UNLOCK(vobj); 531 return (error); 532 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) { 533 KASSERT(offset == 0, 534 ("unexpected offset in tmpfs_mappedread for sendfile")); 535 if (vm_page_sleep_if_busy(m, FALSE, "tmfsmr")) 536 goto lookupvpg; 537 vm_page_busy(m); 538 VM_OBJECT_UNLOCK(vobj); 539 sched_pin(); 540 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 541 ma = (char *)sf_buf_kva(sf); 542 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma); 543 if (error == 0) { 544 if (tlen != PAGE_SIZE) 545 bzero(ma + tlen, PAGE_SIZE - tlen); 546 uio->uio_offset += tlen; 547 uio->uio_resid -= tlen; 548 } 549 sf_buf_free(sf); 550 sched_unpin(); 551 VM_OBJECT_LOCK(vobj); 552 if (error == 0) 553 m->valid = VM_PAGE_BITS_ALL; 554 vm_page_wakeup(m); 555 VM_OBJECT_UNLOCK(vobj); 556 return (error); 557 } 558 VM_OBJECT_UNLOCK(vobj); 559 nocache: 560 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio); 561 562 return (error); 563 } 564 565 static int 566 tmpfs_read(struct vop_read_args *v) 567 { 568 struct vnode *vp = v->a_vp; 569 struct uio *uio = v->a_uio; 570 571 struct tmpfs_node *node; 572 vm_object_t uobj; 573 size_t len; 574 int resid; 575 576 int error = 0; 577 578 node = VP_TO_TMPFS_NODE(vp); 579 580 if (vp->v_type != VREG) { 581 error = EISDIR; 582 goto out; 583 } 584 585 if (uio->uio_offset < 0) { 586 error = EINVAL; 587 goto out; 588 } 589 590 node->tn_status |= TMPFS_NODE_ACCESSED; 591 592 uobj = node->tn_reg.tn_aobj; 593 while ((resid = uio->uio_resid) > 0) { 594 error = 0; 595 if (node->tn_size <= uio->uio_offset) 596 break; 597 len = MIN(node->tn_size - uio->uio_offset, resid); 598 if (len == 0) 599 break; 600 error = tmpfs_mappedread(vp->v_object, uobj, len, uio); 601 if ((error != 0) || (resid == uio->uio_resid)) 602 break; 603 } 604 605 out: 606 607 return error; 608 } 609 610 /* --------------------------------------------------------------------- */ 611 612 static int 613 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio) 614 { 615 vm_pindex_t idx; 616 vm_page_t vpg, tpg; 617 vm_offset_t offset; 618 off_t addr; 619 size_t tlen; 620 int error; 621 622 error = 0; 623 624 addr = uio->uio_offset; 625 idx = OFF_TO_IDX(addr); 626 offset = addr & PAGE_MASK; 627 tlen = MIN(PAGE_SIZE - offset, len); 628 629 if ((vobj == NULL) || (vobj->resident_page_count == 0)) { 630 vpg = NULL; 631 goto nocache; 632 } 633 634 VM_OBJECT_LOCK(vobj); 635 lookupvpg: 636 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) && 637 vm_page_is_valid(vpg, offset, tlen)) { 638 if (vm_page_sleep_if_busy(vpg, FALSE, "tmfsmw")) 639 goto lookupvpg; 640 vm_page_busy(vpg); 641 vm_page_lock_queues(); 642 vm_page_undirty(vpg); 643 vm_page_unlock_queues(); 644 VM_OBJECT_UNLOCK(vobj); 645 error = uiomove_fromphys(&vpg, offset, tlen, uio); 646 } else { 647 VM_OBJECT_UNLOCK(vobj); 648 vpg = NULL; 649 } 650 nocache: 651 VM_OBJECT_LOCK(tobj); 652 vm_object_pip_add(tobj, 1); 653 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED | 654 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 655 if (tpg->valid != VM_PAGE_BITS_ALL) { 656 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 657 error = vm_pager_get_pages(tobj, &tpg, 1, 0); 658 if (error != 0) { 659 printf("tmpfs get pages from pager error [write]\n"); 660 goto out; 661 } 662 } else 663 vm_page_zero_invalid(tpg, TRUE); 664 } 665 VM_OBJECT_UNLOCK(tobj); 666 if (vpg == NULL) 667 error = uiomove_fromphys(&tpg, offset, tlen, uio); 668 else { 669 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid")); 670 pmap_copy_page(vpg, tpg); 671 } 672 VM_OBJECT_LOCK(tobj); 673 out: 674 if (vobj != NULL) 675 VM_OBJECT_LOCK(vobj); 676 vm_page_lock_queues(); 677 if (error == 0) { 678 KASSERT(tpg->valid == VM_PAGE_BITS_ALL, 679 ("parts of tpg invalid")); 680 vm_page_dirty(tpg); 681 } 682 vm_page_unwire(tpg, TRUE); 683 vm_page_unlock_queues(); 684 vm_page_wakeup(tpg); 685 if (vpg != NULL) 686 vm_page_wakeup(vpg); 687 if (vobj != NULL) 688 VM_OBJECT_UNLOCK(vobj); 689 vm_object_pip_subtract(tobj, 1); 690 VM_OBJECT_UNLOCK(tobj); 691 692 return (error); 693 } 694 695 static int 696 tmpfs_write(struct vop_write_args *v) 697 { 698 struct vnode *vp = v->a_vp; 699 struct uio *uio = v->a_uio; 700 int ioflag = v->a_ioflag; 701 struct thread *td = uio->uio_td; 702 703 boolean_t extended; 704 int error = 0; 705 off_t oldsize; 706 struct tmpfs_node *node; 707 vm_object_t uobj; 708 size_t len; 709 int resid; 710 711 node = VP_TO_TMPFS_NODE(vp); 712 oldsize = node->tn_size; 713 714 if (uio->uio_offset < 0 || vp->v_type != VREG) { 715 error = EINVAL; 716 goto out; 717 } 718 719 if (uio->uio_resid == 0) { 720 error = 0; 721 goto out; 722 } 723 724 if (ioflag & IO_APPEND) 725 uio->uio_offset = node->tn_size; 726 727 if (uio->uio_offset + uio->uio_resid > 728 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 729 return (EFBIG); 730 731 if (vn_rlimit_fsize(vp, uio, td)) 732 return (EFBIG); 733 734 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 735 if (extended) { 736 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 737 if (error != 0) 738 goto out; 739 } 740 741 uobj = node->tn_reg.tn_aobj; 742 while ((resid = uio->uio_resid) > 0) { 743 if (node->tn_size <= uio->uio_offset) 744 break; 745 len = MIN(node->tn_size - uio->uio_offset, resid); 746 if (len == 0) 747 break; 748 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio); 749 if ((error != 0) || (resid == uio->uio_resid)) 750 break; 751 } 752 753 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 754 (extended ? TMPFS_NODE_CHANGED : 0); 755 756 if (node->tn_mode & (S_ISUID | S_ISGID)) { 757 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 758 node->tn_mode &= ~(S_ISUID | S_ISGID); 759 } 760 761 if (error != 0) 762 (void)tmpfs_reg_resize(vp, oldsize); 763 764 out: 765 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 766 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 767 768 return error; 769 } 770 771 /* --------------------------------------------------------------------- */ 772 773 static int 774 tmpfs_fsync(struct vop_fsync_args *v) 775 { 776 struct vnode *vp = v->a_vp; 777 778 MPASS(VOP_ISLOCKED(vp)); 779 780 tmpfs_update(vp); 781 782 return 0; 783 } 784 785 /* --------------------------------------------------------------------- */ 786 787 static int 788 tmpfs_remove(struct vop_remove_args *v) 789 { 790 struct vnode *dvp = v->a_dvp; 791 struct vnode *vp = v->a_vp; 792 793 int error; 794 struct tmpfs_dirent *de; 795 struct tmpfs_mount *tmp; 796 struct tmpfs_node *dnode; 797 struct tmpfs_node *node; 798 799 MPASS(VOP_ISLOCKED(dvp)); 800 MPASS(VOP_ISLOCKED(vp)); 801 802 if (vp->v_type == VDIR) { 803 error = EISDIR; 804 goto out; 805 } 806 807 dnode = VP_TO_TMPFS_DIR(dvp); 808 node = VP_TO_TMPFS_NODE(vp); 809 tmp = VFS_TO_TMPFS(vp->v_mount); 810 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 811 MPASS(de != NULL); 812 813 /* Files marked as immutable or append-only cannot be deleted. */ 814 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 815 (dnode->tn_flags & APPEND)) { 816 error = EPERM; 817 goto out; 818 } 819 820 /* Remove the entry from the directory; as it is a file, we do not 821 * have to change the number of hard links of the directory. */ 822 tmpfs_dir_detach(dvp, de); 823 if (v->a_cnp->cn_flags & DOWHITEOUT) 824 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 825 826 /* Free the directory entry we just deleted. Note that the node 827 * referred by it will not be removed until the vnode is really 828 * reclaimed. */ 829 tmpfs_free_dirent(tmp, de, TRUE); 830 831 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 832 error = 0; 833 834 out: 835 836 return error; 837 } 838 839 /* --------------------------------------------------------------------- */ 840 841 static int 842 tmpfs_link(struct vop_link_args *v) 843 { 844 struct vnode *dvp = v->a_tdvp; 845 struct vnode *vp = v->a_vp; 846 struct componentname *cnp = v->a_cnp; 847 848 int error; 849 struct tmpfs_dirent *de; 850 struct tmpfs_node *node; 851 852 MPASS(VOP_ISLOCKED(dvp)); 853 MPASS(cnp->cn_flags & HASBUF); 854 MPASS(dvp != vp); /* XXX When can this be false? */ 855 856 node = VP_TO_TMPFS_NODE(vp); 857 858 /* XXX: Why aren't the following two tests done by the caller? */ 859 860 /* Hard links of directories are forbidden. */ 861 if (vp->v_type == VDIR) { 862 error = EPERM; 863 goto out; 864 } 865 866 /* Cannot create cross-device links. */ 867 if (dvp->v_mount != vp->v_mount) { 868 error = EXDEV; 869 goto out; 870 } 871 872 /* Ensure that we do not overflow the maximum number of links imposed 873 * by the system. */ 874 MPASS(node->tn_links <= LINK_MAX); 875 if (node->tn_links == LINK_MAX) { 876 error = EMLINK; 877 goto out; 878 } 879 880 /* We cannot create links of files marked immutable or append-only. */ 881 if (node->tn_flags & (IMMUTABLE | APPEND)) { 882 error = EPERM; 883 goto out; 884 } 885 886 /* Allocate a new directory entry to represent the node. */ 887 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 888 cnp->cn_nameptr, cnp->cn_namelen, &de); 889 if (error != 0) 890 goto out; 891 892 /* Insert the new directory entry into the appropriate directory. */ 893 if (cnp->cn_flags & ISWHITEOUT) 894 tmpfs_dir_whiteout_remove(dvp, cnp); 895 tmpfs_dir_attach(dvp, de); 896 897 /* vp link count has changed, so update node times. */ 898 node->tn_status |= TMPFS_NODE_CHANGED; 899 tmpfs_update(vp); 900 901 error = 0; 902 903 out: 904 return error; 905 } 906 907 /* --------------------------------------------------------------------- */ 908 909 /* 910 * We acquire all but fdvp locks using non-blocking acquisitions. If we 911 * fail to acquire any lock in the path we will drop all held locks, 912 * acquire the new lock in a blocking fashion, and then release it and 913 * restart the rename. This acquire/release step ensures that we do not 914 * spin on a lock waiting for release. On error release all vnode locks 915 * and decrement references the way tmpfs_rename() would do. 916 */ 917 static int 918 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 919 struct vnode *tdvp, struct vnode **tvpp, 920 struct componentname *fcnp, struct componentname *tcnp) 921 { 922 struct vnode *nvp; 923 struct mount *mp; 924 struct tmpfs_dirent *de; 925 int error, restarts = 0; 926 927 VOP_UNLOCK(tdvp, 0); 928 if (*tvpp != NULL && *tvpp != tdvp) 929 VOP_UNLOCK(*tvpp, 0); 930 mp = fdvp->v_mount; 931 932 relock: 933 restarts += 1; 934 error = vn_lock(fdvp, LK_EXCLUSIVE); 935 if (error) 936 goto releout; 937 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 938 VOP_UNLOCK(fdvp, 0); 939 error = vn_lock(tdvp, LK_EXCLUSIVE); 940 if (error) 941 goto releout; 942 VOP_UNLOCK(tdvp, 0); 943 goto relock; 944 } 945 /* 946 * Re-resolve fvp to be certain it still exists and fetch the 947 * correct vnode. 948 */ 949 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 950 if (de == NULL) { 951 VOP_UNLOCK(fdvp, 0); 952 VOP_UNLOCK(tdvp, 0); 953 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 954 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 955 error = EINVAL; 956 else 957 error = ENOENT; 958 goto releout; 959 } 960 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 961 if (error != 0) { 962 VOP_UNLOCK(fdvp, 0); 963 VOP_UNLOCK(tdvp, 0); 964 if (error != EBUSY) 965 goto releout; 966 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 967 if (error != 0) 968 goto releout; 969 VOP_UNLOCK(nvp, 0); 970 /* 971 * Concurrent rename race. 972 */ 973 if (nvp == tdvp) { 974 vrele(nvp); 975 error = EINVAL; 976 goto releout; 977 } 978 vrele(*fvpp); 979 *fvpp = nvp; 980 goto relock; 981 } 982 vrele(*fvpp); 983 *fvpp = nvp; 984 VOP_UNLOCK(*fvpp, 0); 985 /* 986 * Re-resolve tvp and acquire the vnode lock if present. 987 */ 988 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 989 /* 990 * If tvp disappeared we just carry on. 991 */ 992 if (de == NULL && *tvpp != NULL) { 993 vrele(*tvpp); 994 *tvpp = NULL; 995 } 996 /* 997 * Get the tvp ino if the lookup succeeded. We may have to restart 998 * if the non-blocking acquire fails. 999 */ 1000 if (de != NULL) { 1001 nvp = NULL; 1002 error = tmpfs_alloc_vp(mp, de->td_node, 1003 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 1004 if (*tvpp != NULL) 1005 vrele(*tvpp); 1006 *tvpp = nvp; 1007 if (error != 0) { 1008 VOP_UNLOCK(fdvp, 0); 1009 VOP_UNLOCK(tdvp, 0); 1010 if (error != EBUSY) 1011 goto releout; 1012 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 1013 &nvp); 1014 if (error != 0) 1015 goto releout; 1016 VOP_UNLOCK(nvp, 0); 1017 /* 1018 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 1019 */ 1020 if (nvp == fdvp) { 1021 error = ENOTEMPTY; 1022 goto releout; 1023 } 1024 goto relock; 1025 } 1026 } 1027 tmpfs_rename_restarts += restarts; 1028 1029 return (0); 1030 1031 releout: 1032 vrele(fdvp); 1033 vrele(*fvpp); 1034 vrele(tdvp); 1035 if (*tvpp != NULL) 1036 vrele(*tvpp); 1037 tmpfs_rename_restarts += restarts; 1038 1039 return (error); 1040 } 1041 1042 static int 1043 tmpfs_rename(struct vop_rename_args *v) 1044 { 1045 struct vnode *fdvp = v->a_fdvp; 1046 struct vnode *fvp = v->a_fvp; 1047 struct componentname *fcnp = v->a_fcnp; 1048 struct vnode *tdvp = v->a_tdvp; 1049 struct vnode *tvp = v->a_tvp; 1050 struct componentname *tcnp = v->a_tcnp; 1051 struct mount *mp = NULL; 1052 1053 char *newname; 1054 int error; 1055 struct tmpfs_dirent *de; 1056 struct tmpfs_mount *tmp; 1057 struct tmpfs_node *fdnode; 1058 struct tmpfs_node *fnode; 1059 struct tmpfs_node *tnode; 1060 struct tmpfs_node *tdnode; 1061 1062 MPASS(VOP_ISLOCKED(tdvp)); 1063 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 1064 MPASS(fcnp->cn_flags & HASBUF); 1065 MPASS(tcnp->cn_flags & HASBUF); 1066 1067 /* Disallow cross-device renames. 1068 * XXX Why isn't this done by the caller? */ 1069 if (fvp->v_mount != tdvp->v_mount || 1070 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1071 error = EXDEV; 1072 goto out; 1073 } 1074 1075 /* If source and target are the same file, there is nothing to do. */ 1076 if (fvp == tvp) { 1077 error = 0; 1078 goto out; 1079 } 1080 1081 /* If we need to move the directory between entries, lock the 1082 * source so that we can safely operate on it. */ 1083 if (fdvp != tdvp && fdvp != tvp) { 1084 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1085 mp = tdvp->v_mount; 1086 error = vfs_busy(mp, 0); 1087 if (error != 0) { 1088 mp = NULL; 1089 goto out; 1090 } 1091 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1092 fcnp, tcnp); 1093 if (error != 0) { 1094 vfs_unbusy(mp); 1095 return (error); 1096 } 1097 ASSERT_VOP_ELOCKED(fdvp, 1098 "tmpfs_rename: fdvp not locked"); 1099 ASSERT_VOP_ELOCKED(tdvp, 1100 "tmpfs_rename: tdvp not locked"); 1101 if (tvp != NULL) 1102 ASSERT_VOP_ELOCKED(tvp, 1103 "tmpfs_rename: tvp not locked"); 1104 if (fvp == tvp) { 1105 error = 0; 1106 goto out_locked; 1107 } 1108 } 1109 } 1110 1111 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1112 tdnode = VP_TO_TMPFS_DIR(tdvp); 1113 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1114 fdnode = VP_TO_TMPFS_DIR(fdvp); 1115 fnode = VP_TO_TMPFS_NODE(fvp); 1116 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1117 1118 /* Entry can disappear before we lock fdvp, 1119 * also avoid manipulating '.' and '..' entries. */ 1120 if (de == NULL) { 1121 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1122 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1123 error = EINVAL; 1124 else 1125 error = ENOENT; 1126 goto out_locked; 1127 } 1128 MPASS(de->td_node == fnode); 1129 1130 /* If re-naming a directory to another preexisting directory 1131 * ensure that the target directory is empty so that its 1132 * removal causes no side effects. 1133 * Kern_rename gurantees the destination to be a directory 1134 * if the source is one. */ 1135 if (tvp != NULL) { 1136 MPASS(tnode != NULL); 1137 1138 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1139 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1140 error = EPERM; 1141 goto out_locked; 1142 } 1143 1144 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1145 if (tnode->tn_size > 0) { 1146 error = ENOTEMPTY; 1147 goto out_locked; 1148 } 1149 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1150 error = ENOTDIR; 1151 goto out_locked; 1152 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1153 error = EISDIR; 1154 goto out_locked; 1155 } else { 1156 MPASS(fnode->tn_type != VDIR && 1157 tnode->tn_type != VDIR); 1158 } 1159 } 1160 1161 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1162 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1163 error = EPERM; 1164 goto out_locked; 1165 } 1166 1167 /* Ensure that we have enough memory to hold the new name, if it 1168 * has to be changed. */ 1169 if (fcnp->cn_namelen != tcnp->cn_namelen || 1170 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1171 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1172 } else 1173 newname = NULL; 1174 1175 /* If the node is being moved to another directory, we have to do 1176 * the move. */ 1177 if (fdnode != tdnode) { 1178 /* In case we are moving a directory, we have to adjust its 1179 * parent to point to the new parent. */ 1180 if (de->td_node->tn_type == VDIR) { 1181 struct tmpfs_node *n; 1182 1183 /* Ensure the target directory is not a child of the 1184 * directory being moved. Otherwise, we'd end up 1185 * with stale nodes. */ 1186 n = tdnode; 1187 /* TMPFS_LOCK garanties that no nodes are freed while 1188 * traversing the list. Nodes can only be marked as 1189 * removed: tn_parent == NULL. */ 1190 TMPFS_LOCK(tmp); 1191 TMPFS_NODE_LOCK(n); 1192 while (n != n->tn_dir.tn_parent) { 1193 struct tmpfs_node *parent; 1194 1195 if (n == fnode) { 1196 TMPFS_NODE_UNLOCK(n); 1197 TMPFS_UNLOCK(tmp); 1198 error = EINVAL; 1199 if (newname != NULL) 1200 free(newname, M_TMPFSNAME); 1201 goto out_locked; 1202 } 1203 parent = n->tn_dir.tn_parent; 1204 TMPFS_NODE_UNLOCK(n); 1205 if (parent == NULL) { 1206 n = NULL; 1207 break; 1208 } 1209 TMPFS_NODE_LOCK(parent); 1210 if (parent->tn_dir.tn_parent == NULL) { 1211 TMPFS_NODE_UNLOCK(parent); 1212 n = NULL; 1213 break; 1214 } 1215 n = parent; 1216 } 1217 TMPFS_UNLOCK(tmp); 1218 if (n == NULL) { 1219 error = EINVAL; 1220 if (newname != NULL) 1221 free(newname, M_TMPFSNAME); 1222 goto out_locked; 1223 } 1224 TMPFS_NODE_UNLOCK(n); 1225 1226 /* Adjust the parent pointer. */ 1227 TMPFS_VALIDATE_DIR(fnode); 1228 TMPFS_NODE_LOCK(de->td_node); 1229 de->td_node->tn_dir.tn_parent = tdnode; 1230 TMPFS_NODE_UNLOCK(de->td_node); 1231 1232 /* As a result of changing the target of the '..' 1233 * entry, the link count of the source and target 1234 * directories has to be adjusted. */ 1235 TMPFS_NODE_LOCK(tdnode); 1236 TMPFS_ASSERT_LOCKED(tdnode); 1237 tdnode->tn_links++; 1238 TMPFS_NODE_UNLOCK(tdnode); 1239 1240 TMPFS_NODE_LOCK(fdnode); 1241 TMPFS_ASSERT_LOCKED(fdnode); 1242 fdnode->tn_links--; 1243 TMPFS_NODE_UNLOCK(fdnode); 1244 } 1245 1246 /* Do the move: just remove the entry from the source directory 1247 * and insert it into the target one. */ 1248 tmpfs_dir_detach(fdvp, de); 1249 if (fcnp->cn_flags & DOWHITEOUT) 1250 tmpfs_dir_whiteout_add(fdvp, fcnp); 1251 if (tcnp->cn_flags & ISWHITEOUT) 1252 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1253 tmpfs_dir_attach(tdvp, de); 1254 } 1255 1256 /* If the name has changed, we need to make it effective by changing 1257 * it in the directory entry. */ 1258 if (newname != NULL) { 1259 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1260 1261 free(de->td_name, M_TMPFSNAME); 1262 de->td_namelen = (uint16_t)tcnp->cn_namelen; 1263 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 1264 de->td_name = newname; 1265 1266 fnode->tn_status |= TMPFS_NODE_CHANGED; 1267 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1268 } 1269 1270 /* If we are overwriting an entry, we have to remove the old one 1271 * from the target directory. */ 1272 if (tvp != NULL) { 1273 /* Remove the old entry from the target directory. */ 1274 de = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1275 tmpfs_dir_detach(tdvp, de); 1276 1277 /* Free the directory entry we just deleted. Note that the 1278 * node referred by it will not be removed until the vnode is 1279 * really reclaimed. */ 1280 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 1281 } 1282 cache_purge(fvp); 1283 if (tvp != NULL) 1284 cache_purge(tvp); 1285 cache_purge_negative(tdvp); 1286 1287 error = 0; 1288 1289 out_locked: 1290 if (fdvp != tdvp && fdvp != tvp) 1291 VOP_UNLOCK(fdvp, 0); 1292 1293 out: 1294 /* Release target nodes. */ 1295 /* XXX: I don't understand when tdvp can be the same as tvp, but 1296 * other code takes care of this... */ 1297 if (tdvp == tvp) 1298 vrele(tdvp); 1299 else 1300 vput(tdvp); 1301 if (tvp != NULL) 1302 vput(tvp); 1303 1304 /* Release source nodes. */ 1305 vrele(fdvp); 1306 vrele(fvp); 1307 1308 if (mp != NULL) 1309 vfs_unbusy(mp); 1310 1311 return error; 1312 } 1313 1314 /* --------------------------------------------------------------------- */ 1315 1316 static int 1317 tmpfs_mkdir(struct vop_mkdir_args *v) 1318 { 1319 struct vnode *dvp = v->a_dvp; 1320 struct vnode **vpp = v->a_vpp; 1321 struct componentname *cnp = v->a_cnp; 1322 struct vattr *vap = v->a_vap; 1323 1324 MPASS(vap->va_type == VDIR); 1325 1326 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1327 } 1328 1329 /* --------------------------------------------------------------------- */ 1330 1331 static int 1332 tmpfs_rmdir(struct vop_rmdir_args *v) 1333 { 1334 struct vnode *dvp = v->a_dvp; 1335 struct vnode *vp = v->a_vp; 1336 1337 int error; 1338 struct tmpfs_dirent *de; 1339 struct tmpfs_mount *tmp; 1340 struct tmpfs_node *dnode; 1341 struct tmpfs_node *node; 1342 1343 MPASS(VOP_ISLOCKED(dvp)); 1344 MPASS(VOP_ISLOCKED(vp)); 1345 1346 tmp = VFS_TO_TMPFS(dvp->v_mount); 1347 dnode = VP_TO_TMPFS_DIR(dvp); 1348 node = VP_TO_TMPFS_DIR(vp); 1349 1350 /* Directories with more than two entries ('.' and '..') cannot be 1351 * removed. */ 1352 if (node->tn_size > 0) { 1353 error = ENOTEMPTY; 1354 goto out; 1355 } 1356 1357 if ((dnode->tn_flags & APPEND) 1358 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1359 error = EPERM; 1360 goto out; 1361 } 1362 1363 /* This invariant holds only if we are not trying to remove "..". 1364 * We checked for that above so this is safe now. */ 1365 MPASS(node->tn_dir.tn_parent == dnode); 1366 1367 /* Get the directory entry associated with node (vp). This was 1368 * filled by tmpfs_lookup while looking up the entry. */ 1369 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1370 MPASS(TMPFS_DIRENT_MATCHES(de, 1371 v->a_cnp->cn_nameptr, 1372 v->a_cnp->cn_namelen)); 1373 1374 /* Check flags to see if we are allowed to remove the directory. */ 1375 if (dnode->tn_flags & APPEND 1376 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1377 error = EPERM; 1378 goto out; 1379 } 1380 1381 1382 /* Detach the directory entry from the directory (dnode). */ 1383 tmpfs_dir_detach(dvp, de); 1384 if (v->a_cnp->cn_flags & DOWHITEOUT) 1385 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1386 1387 /* No vnode should be allocated for this entry from this point */ 1388 TMPFS_NODE_LOCK(node); 1389 TMPFS_ASSERT_ELOCKED(node); 1390 node->tn_links--; 1391 node->tn_dir.tn_parent = NULL; 1392 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1393 TMPFS_NODE_MODIFIED; 1394 1395 TMPFS_NODE_UNLOCK(node); 1396 1397 TMPFS_NODE_LOCK(dnode); 1398 TMPFS_ASSERT_ELOCKED(dnode); 1399 dnode->tn_links--; 1400 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1401 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1402 TMPFS_NODE_UNLOCK(dnode); 1403 1404 cache_purge(dvp); 1405 cache_purge(vp); 1406 1407 /* Free the directory entry we just deleted. Note that the node 1408 * referred by it will not be removed until the vnode is really 1409 * reclaimed. */ 1410 tmpfs_free_dirent(tmp, de, TRUE); 1411 1412 /* Release the deleted vnode (will destroy the node, notify 1413 * interested parties and clean it from the cache). */ 1414 1415 dnode->tn_status |= TMPFS_NODE_CHANGED; 1416 tmpfs_update(dvp); 1417 1418 error = 0; 1419 1420 out: 1421 return error; 1422 } 1423 1424 /* --------------------------------------------------------------------- */ 1425 1426 static int 1427 tmpfs_symlink(struct vop_symlink_args *v) 1428 { 1429 struct vnode *dvp = v->a_dvp; 1430 struct vnode **vpp = v->a_vpp; 1431 struct componentname *cnp = v->a_cnp; 1432 struct vattr *vap = v->a_vap; 1433 char *target = v->a_target; 1434 1435 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1436 MPASS(vap->va_type == VLNK); 1437 #else 1438 vap->va_type = VLNK; 1439 #endif 1440 1441 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1442 } 1443 1444 /* --------------------------------------------------------------------- */ 1445 1446 static int 1447 tmpfs_readdir(struct vop_readdir_args *v) 1448 { 1449 struct vnode *vp = v->a_vp; 1450 struct uio *uio = v->a_uio; 1451 int *eofflag = v->a_eofflag; 1452 u_long **cookies = v->a_cookies; 1453 int *ncookies = v->a_ncookies; 1454 1455 int error; 1456 off_t startoff; 1457 off_t cnt = 0; 1458 struct tmpfs_node *node; 1459 1460 /* This operation only makes sense on directory nodes. */ 1461 if (vp->v_type != VDIR) 1462 return ENOTDIR; 1463 1464 node = VP_TO_TMPFS_DIR(vp); 1465 1466 startoff = uio->uio_offset; 1467 1468 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1469 error = tmpfs_dir_getdotdent(node, uio); 1470 if (error != 0) 1471 goto outok; 1472 cnt++; 1473 } 1474 1475 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1476 error = tmpfs_dir_getdotdotdent(node, uio); 1477 if (error != 0) 1478 goto outok; 1479 cnt++; 1480 } 1481 1482 error = tmpfs_dir_getdents(node, uio, &cnt); 1483 1484 outok: 1485 MPASS(error >= -1); 1486 1487 if (error == -1) 1488 error = (cnt != 0) ? 0 : EINVAL; 1489 1490 if (eofflag != NULL) 1491 *eofflag = 1492 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1493 1494 /* Update NFS-related variables. */ 1495 if (error == 0 && cookies != NULL && ncookies != NULL) { 1496 off_t i; 1497 off_t off = startoff; 1498 struct tmpfs_dirent *de = NULL; 1499 1500 *ncookies = cnt; 1501 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1502 1503 for (i = 0; i < cnt; i++) { 1504 MPASS(off != TMPFS_DIRCOOKIE_EOF); 1505 if (off == TMPFS_DIRCOOKIE_DOT) { 1506 off = TMPFS_DIRCOOKIE_DOTDOT; 1507 } else { 1508 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1509 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 1510 } else if (de != NULL) { 1511 de = TAILQ_NEXT(de, td_entries); 1512 } else { 1513 de = tmpfs_dir_lookupbycookie(node, 1514 off); 1515 MPASS(de != NULL); 1516 de = TAILQ_NEXT(de, td_entries); 1517 } 1518 if (de == NULL) 1519 off = TMPFS_DIRCOOKIE_EOF; 1520 else 1521 off = tmpfs_dircookie(de); 1522 } 1523 1524 (*cookies)[i] = off; 1525 } 1526 MPASS(uio->uio_offset == off); 1527 } 1528 1529 return error; 1530 } 1531 1532 /* --------------------------------------------------------------------- */ 1533 1534 static int 1535 tmpfs_readlink(struct vop_readlink_args *v) 1536 { 1537 struct vnode *vp = v->a_vp; 1538 struct uio *uio = v->a_uio; 1539 1540 int error; 1541 struct tmpfs_node *node; 1542 1543 MPASS(uio->uio_offset == 0); 1544 MPASS(vp->v_type == VLNK); 1545 1546 node = VP_TO_TMPFS_NODE(vp); 1547 1548 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1549 uio); 1550 node->tn_status |= TMPFS_NODE_ACCESSED; 1551 1552 return error; 1553 } 1554 1555 /* --------------------------------------------------------------------- */ 1556 1557 static int 1558 tmpfs_inactive(struct vop_inactive_args *v) 1559 { 1560 struct vnode *vp = v->a_vp; 1561 struct thread *l = v->a_td; 1562 1563 struct tmpfs_node *node; 1564 1565 MPASS(VOP_ISLOCKED(vp)); 1566 1567 node = VP_TO_TMPFS_NODE(vp); 1568 1569 if (node->tn_links == 0) 1570 vrecycle(vp, l); 1571 1572 return 0; 1573 } 1574 1575 /* --------------------------------------------------------------------- */ 1576 1577 int 1578 tmpfs_reclaim(struct vop_reclaim_args *v) 1579 { 1580 struct vnode *vp = v->a_vp; 1581 1582 struct tmpfs_mount *tmp; 1583 struct tmpfs_node *node; 1584 1585 node = VP_TO_TMPFS_NODE(vp); 1586 tmp = VFS_TO_TMPFS(vp->v_mount); 1587 1588 vnode_destroy_vobject(vp); 1589 cache_purge(vp); 1590 1591 TMPFS_NODE_LOCK(node); 1592 TMPFS_ASSERT_ELOCKED(node); 1593 tmpfs_free_vp(vp); 1594 1595 /* If the node referenced by this vnode was deleted by the user, 1596 * we must free its associated data structures (now that the vnode 1597 * is being reclaimed). */ 1598 if (node->tn_links == 0 && 1599 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1600 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1601 TMPFS_NODE_UNLOCK(node); 1602 tmpfs_free_node(tmp, node); 1603 } else 1604 TMPFS_NODE_UNLOCK(node); 1605 1606 MPASS(vp->v_data == NULL); 1607 return 0; 1608 } 1609 1610 /* --------------------------------------------------------------------- */ 1611 1612 static int 1613 tmpfs_print(struct vop_print_args *v) 1614 { 1615 struct vnode *vp = v->a_vp; 1616 1617 struct tmpfs_node *node; 1618 1619 node = VP_TO_TMPFS_NODE(vp); 1620 1621 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1622 node, node->tn_flags, node->tn_links); 1623 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1624 ", status 0x%x\n", 1625 node->tn_mode, node->tn_uid, node->tn_gid, 1626 (uintmax_t)node->tn_size, node->tn_status); 1627 1628 if (vp->v_type == VFIFO) 1629 fifo_printinfo(vp); 1630 1631 printf("\n"); 1632 1633 return 0; 1634 } 1635 1636 /* --------------------------------------------------------------------- */ 1637 1638 static int 1639 tmpfs_pathconf(struct vop_pathconf_args *v) 1640 { 1641 int name = v->a_name; 1642 register_t *retval = v->a_retval; 1643 1644 int error; 1645 1646 error = 0; 1647 1648 switch (name) { 1649 case _PC_LINK_MAX: 1650 *retval = LINK_MAX; 1651 break; 1652 1653 case _PC_NAME_MAX: 1654 *retval = NAME_MAX; 1655 break; 1656 1657 case _PC_PATH_MAX: 1658 *retval = PATH_MAX; 1659 break; 1660 1661 case _PC_PIPE_BUF: 1662 *retval = PIPE_BUF; 1663 break; 1664 1665 case _PC_CHOWN_RESTRICTED: 1666 *retval = 1; 1667 break; 1668 1669 case _PC_NO_TRUNC: 1670 *retval = 1; 1671 break; 1672 1673 case _PC_SYNC_IO: 1674 *retval = 1; 1675 break; 1676 1677 case _PC_FILESIZEBITS: 1678 *retval = 0; /* XXX Don't know which value should I return. */ 1679 break; 1680 1681 default: 1682 error = EINVAL; 1683 } 1684 1685 return error; 1686 } 1687 1688 static int 1689 tmpfs_vptofh(struct vop_vptofh_args *ap) 1690 { 1691 struct tmpfs_fid *tfhp; 1692 struct tmpfs_node *node; 1693 1694 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1695 node = VP_TO_TMPFS_NODE(ap->a_vp); 1696 1697 tfhp->tf_len = sizeof(struct tmpfs_fid); 1698 tfhp->tf_id = node->tn_id; 1699 tfhp->tf_gen = node->tn_gen; 1700 1701 return (0); 1702 } 1703 1704 static int 1705 tmpfs_whiteout(struct vop_whiteout_args *ap) 1706 { 1707 struct vnode *dvp = ap->a_dvp; 1708 struct componentname *cnp = ap->a_cnp; 1709 struct tmpfs_dirent *de; 1710 1711 switch (ap->a_flags) { 1712 case LOOKUP: 1713 return (0); 1714 case CREATE: 1715 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1716 if (de != NULL) 1717 return (de->td_node == NULL ? 0 : EEXIST); 1718 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1719 case DELETE: 1720 tmpfs_dir_whiteout_remove(dvp, cnp); 1721 return (0); 1722 default: 1723 panic("tmpfs_whiteout: unknown op"); 1724 } 1725 } 1726 1727 /* --------------------------------------------------------------------- */ 1728 1729 /* 1730 * vnode operations vector used for files stored in a tmpfs file system. 1731 */ 1732 struct vop_vector tmpfs_vnodeop_entries = { 1733 .vop_default = &default_vnodeops, 1734 .vop_lookup = vfs_cache_lookup, 1735 .vop_cachedlookup = tmpfs_lookup, 1736 .vop_create = tmpfs_create, 1737 .vop_mknod = tmpfs_mknod, 1738 .vop_open = tmpfs_open, 1739 .vop_close = tmpfs_close, 1740 .vop_access = tmpfs_access, 1741 .vop_getattr = tmpfs_getattr, 1742 .vop_setattr = tmpfs_setattr, 1743 .vop_read = tmpfs_read, 1744 .vop_write = tmpfs_write, 1745 .vop_fsync = tmpfs_fsync, 1746 .vop_remove = tmpfs_remove, 1747 .vop_link = tmpfs_link, 1748 .vop_rename = tmpfs_rename, 1749 .vop_mkdir = tmpfs_mkdir, 1750 .vop_rmdir = tmpfs_rmdir, 1751 .vop_symlink = tmpfs_symlink, 1752 .vop_readdir = tmpfs_readdir, 1753 .vop_readlink = tmpfs_readlink, 1754 .vop_inactive = tmpfs_inactive, 1755 .vop_reclaim = tmpfs_reclaim, 1756 .vop_print = tmpfs_print, 1757 .vop_pathconf = tmpfs_pathconf, 1758 .vop_vptofh = tmpfs_vptofh, 1759 .vop_whiteout = tmpfs_whiteout, 1760 .vop_bmap = VOP_EOPNOTSUPP, 1761 }; 1762
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