1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/fcntl.h> 41 #include <sys/lockf.h> 42 #include <sys/lock.h> 43 #include <sys/namei.h> 44 #include <sys/priv.h> 45 #include <sys/proc.h> 46 #include <sys/rwlock.h> 47 #include <sys/sched.h> 48 #include <sys/sf_buf.h> 49 #include <sys/stat.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_param.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_pager.h> 60 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 SYSCTL_DECL(_vfs_tmpfs); 65 66 static volatile int tmpfs_rename_restarts; 67 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69 "Times rename had to restart due to lock contention"); 70 71 /* --------------------------------------------------------------------- */ 72 73 static int 74 tmpfs_lookup(struct vop_cachedlookup_args *v) 75 { 76 struct vnode *dvp = v->a_dvp; 77 struct vnode **vpp = v->a_vpp; 78 struct componentname *cnp = v->a_cnp; 79 80 int error; 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode; 83 84 dnode = VP_TO_TMPFS_DIR(dvp); 85 *vpp = NULLVP; 86 87 /* Check accessibility of requested node as a first step. */ 88 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 89 if (error != 0) 90 goto out; 91 92 /* We cannot be requesting the parent directory of the root node. */ 93 MPASS(IMPLIES(dnode->tn_type == VDIR && 94 dnode->tn_dir.tn_parent == dnode, 95 !(cnp->cn_flags & ISDOTDOT))); 96 97 TMPFS_ASSERT_LOCKED(dnode); 98 if (dnode->tn_dir.tn_parent == NULL) { 99 error = ENOENT; 100 goto out; 101 } 102 if (cnp->cn_flags & ISDOTDOT) { 103 int ltype = 0; 104 105 ltype = VOP_ISLOCKED(dvp); 106 vhold(dvp); 107 VOP_UNLOCK(dvp, 0); 108 /* Allocate a new vnode on the matching entry. */ 109 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 110 cnp->cn_lkflags, vpp); 111 112 vn_lock(dvp, ltype | LK_RETRY); 113 vdrop(dvp); 114 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115 VREF(dvp); 116 *vpp = dvp; 117 error = 0; 118 } else { 119 de = tmpfs_dir_lookup(dnode, NULL, cnp); 120 if (de != NULL && de->td_node == NULL) 121 cnp->cn_flags |= ISWHITEOUT; 122 if (de == NULL || de->td_node == NULL) { 123 /* The entry was not found in the directory. 124 * This is OK if we are creating or renaming an 125 * entry and are working on the last component of 126 * the path name. */ 127 if ((cnp->cn_flags & ISLASTCN) && 128 (cnp->cn_nameiop == CREATE || \ 129 cnp->cn_nameiop == RENAME || 130 (cnp->cn_nameiop == DELETE && 131 cnp->cn_flags & DOWHITEOUT && 132 cnp->cn_flags & ISWHITEOUT))) { 133 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134 cnp->cn_thread); 135 if (error != 0) 136 goto out; 137 138 /* Keep the component name in the buffer for 139 * future uses. */ 140 cnp->cn_flags |= SAVENAME; 141 142 error = EJUSTRETURN; 143 } else 144 error = ENOENT; 145 } else { 146 struct tmpfs_node *tnode; 147 148 /* The entry was found, so get its associated 149 * tmpfs_node. */ 150 tnode = de->td_node; 151 152 /* If we are not at the last path component and 153 * found a non-directory or non-link entry (which 154 * may itself be pointing to a directory), raise 155 * an error. */ 156 if ((tnode->tn_type != VDIR && 157 tnode->tn_type != VLNK) && 158 !(cnp->cn_flags & ISLASTCN)) { 159 error = ENOTDIR; 160 goto out; 161 } 162 163 /* If we are deleting or renaming the entry, keep 164 * track of its tmpfs_dirent so that it can be 165 * easily deleted later. */ 166 if ((cnp->cn_flags & ISLASTCN) && 167 (cnp->cn_nameiop == DELETE || 168 cnp->cn_nameiop == RENAME)) { 169 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 170 cnp->cn_thread); 171 if (error != 0) 172 goto out; 173 174 /* Allocate a new vnode on the matching entry. */ 175 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 176 cnp->cn_lkflags, vpp); 177 if (error != 0) 178 goto out; 179 180 if ((dnode->tn_mode & S_ISTXT) && 181 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 182 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 183 error = EPERM; 184 vput(*vpp); 185 *vpp = NULL; 186 goto out; 187 } 188 cnp->cn_flags |= SAVENAME; 189 } else { 190 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 191 cnp->cn_lkflags, vpp); 192 } 193 } 194 } 195 196 /* Store the result of this lookup in the cache. Avoid this if the 197 * request was for creation, as it does not improve timings on 198 * emprical tests. */ 199 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200 cache_enter(dvp, *vpp, cnp); 201 202 out: 203 /* If there were no errors, *vpp cannot be null and it must be 204 * locked. */ 205 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206 207 return error; 208 } 209 210 /* --------------------------------------------------------------------- */ 211 212 static int 213 tmpfs_create(struct vop_create_args *v) 214 { 215 struct vnode *dvp = v->a_dvp; 216 struct vnode **vpp = v->a_vpp; 217 struct componentname *cnp = v->a_cnp; 218 struct vattr *vap = v->a_vap; 219 220 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 221 222 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 223 } 224 /* --------------------------------------------------------------------- */ 225 226 static int 227 tmpfs_mknod(struct vop_mknod_args *v) 228 { 229 struct vnode *dvp = v->a_dvp; 230 struct vnode **vpp = v->a_vpp; 231 struct componentname *cnp = v->a_cnp; 232 struct vattr *vap = v->a_vap; 233 234 if (vap->va_type != VBLK && vap->va_type != VCHR && 235 vap->va_type != VFIFO) 236 return EINVAL; 237 238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 239 } 240 241 /* --------------------------------------------------------------------- */ 242 243 static int 244 tmpfs_open(struct vop_open_args *v) 245 { 246 struct vnode *vp = v->a_vp; 247 int mode = v->a_mode; 248 249 int error; 250 struct tmpfs_node *node; 251 252 MPASS(VOP_ISLOCKED(vp)); 253 254 node = VP_TO_TMPFS_NODE(vp); 255 256 /* The file is still active but all its names have been removed 257 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 258 * it is about to die. */ 259 if (node->tn_links < 1) 260 return (ENOENT); 261 262 /* If the file is marked append-only, deny write requests. */ 263 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 264 error = EPERM; 265 else { 266 error = 0; 267 /* For regular files, the call below is nop. */ 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273 } 274 275 /* --------------------------------------------------------------------- */ 276 277 static int 278 tmpfs_close(struct vop_close_args *v) 279 { 280 struct vnode *vp = v->a_vp; 281 282 /* Update node times. */ 283 tmpfs_update(vp); 284 285 return (0); 286 } 287 288 /* --------------------------------------------------------------------- */ 289 290 int 291 tmpfs_access(struct vop_access_args *v) 292 { 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338 out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342 } 343 344 /* --------------------------------------------------------------------- */ 345 346 int 347 tmpfs_getattr(struct vop_getattr_args *v) 348 { 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379 } 380 381 /* --------------------------------------------------------------------- */ 382 383 /* XXX Should this operation be atomic? I think it should, but code in 384 * XXX other places (e.g., ufs) doesn't seem to be... */ 385 int 386 tmpfs_setattr(struct vop_setattr_args *v) 387 { 388 struct vnode *vp = v->a_vp; 389 struct vattr *vap = v->a_vap; 390 struct ucred *cred = v->a_cred; 391 struct thread *td = curthread; 392 393 int error; 394 395 MPASS(VOP_ISLOCKED(vp)); 396 397 error = 0; 398 399 /* Abort if any unsettable attribute is given. */ 400 if (vap->va_type != VNON || 401 vap->va_nlink != VNOVAL || 402 vap->va_fsid != VNOVAL || 403 vap->va_fileid != VNOVAL || 404 vap->va_blocksize != VNOVAL || 405 vap->va_gen != VNOVAL || 406 vap->va_rdev != VNOVAL || 407 vap->va_bytes != VNOVAL) 408 error = EINVAL; 409 410 if (error == 0 && (vap->va_flags != VNOVAL)) 411 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 412 413 if (error == 0 && (vap->va_size != VNOVAL)) 414 error = tmpfs_chsize(vp, vap->va_size, cred, td); 415 416 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 420 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 421 422 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 423 vap->va_atime.tv_nsec != VNOVAL) || 424 (vap->va_mtime.tv_sec != VNOVAL && 425 vap->va_mtime.tv_nsec != VNOVAL) || 426 (vap->va_birthtime.tv_sec != VNOVAL && 427 vap->va_birthtime.tv_nsec != VNOVAL))) 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 &vap->va_birthtime, vap->va_vaflags, cred, td); 430 431 /* Update the node times. We give preference to the error codes 432 * generated by this function rather than the ones that may arise 433 * from tmpfs_update. */ 434 tmpfs_update(vp); 435 436 MPASS(VOP_ISLOCKED(vp)); 437 438 return error; 439 } 440 441 static int 442 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 443 vm_offset_t offset, size_t tlen, struct uio *uio) 444 { 445 vm_page_t m; 446 int error, rv; 447 448 VM_OBJECT_WLOCK(tobj); 449 450 /* 451 * The kern_sendfile() code calls vn_rdwr() with the page 452 * soft-busied. Ignore the soft-busy state here. Parallel 453 * reads of the page content from disk are prevented by 454 * VPO_BUSY. 455 * 456 * Although the tmpfs vnode lock is held here, it is 457 * nonetheless safe to sleep waiting for a free page. The 458 * pageout daemon does not need to acquire the tmpfs vnode 459 * lock to page out tobj's pages because tobj is a OBJT_SWAP 460 * type object. 461 */ 462 m = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY | 463 VM_ALLOC_IGN_SBUSY); 464 if (m->valid != VM_PAGE_BITS_ALL) { 465 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 466 rv = vm_pager_get_pages(tobj, &m, 1, 0); 467 m = vm_page_lookup(tobj, idx); 468 if (m == NULL) { 469 printf( 470 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 471 tobj, idx, rv); 472 return (EIO); 473 } 474 if (rv != VM_PAGER_OK) { 475 printf( 476 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 477 tobj, idx, m->valid, rv); 478 vm_page_lock(m); 479 vm_page_free(m); 480 vm_page_unlock(m); 481 VM_OBJECT_WUNLOCK(tobj); 482 return (EIO); 483 } 484 } else 485 vm_page_zero_invalid(m, TRUE); 486 } 487 vm_page_lock(m); 488 vm_page_hold(m); 489 vm_page_wakeup(m); 490 vm_page_unlock(m); 491 VM_OBJECT_WUNLOCK(tobj); 492 error = uiomove_fromphys(&m, offset, tlen, uio); 493 VM_OBJECT_WLOCK(tobj); 494 vm_page_lock(m); 495 vm_page_unhold(m); 496 if (m->queue == PQ_NONE) { 497 vm_page_deactivate(m); 498 } else { 499 /* Requeue to maintain LRU ordering. */ 500 vm_page_requeue(m); 501 } 502 vm_page_unlock(m); 503 VM_OBJECT_WUNLOCK(tobj); 504 505 return (error); 506 } 507 508 static int 509 tmpfs_read(struct vop_read_args *v) 510 { 511 struct vnode *vp = v->a_vp; 512 struct uio *uio = v->a_uio; 513 struct tmpfs_node *node; 514 vm_object_t uobj; 515 size_t len; 516 int resid; 517 int error = 0; 518 vm_pindex_t idx; 519 vm_offset_t offset; 520 off_t addr; 521 size_t tlen; 522 523 node = VP_TO_TMPFS_NODE(vp); 524 525 if (vp->v_type != VREG) { 526 error = EISDIR; 527 goto out; 528 } 529 530 if (uio->uio_offset < 0) { 531 error = EINVAL; 532 goto out; 533 } 534 535 node->tn_status |= TMPFS_NODE_ACCESSED; 536 537 uobj = node->tn_reg.tn_aobj; 538 while ((resid = uio->uio_resid) > 0) { 539 error = 0; 540 if (node->tn_size <= uio->uio_offset) 541 break; 542 len = MIN(node->tn_size - uio->uio_offset, resid); 543 if (len == 0) 544 break; 545 addr = uio->uio_offset; 546 idx = OFF_TO_IDX(addr); 547 offset = addr & PAGE_MASK; 548 tlen = MIN(PAGE_SIZE - offset, len); 549 error = tmpfs_nocacheread(uobj, idx, offset, tlen, uio); 550 if ((error != 0) || (resid == uio->uio_resid)) 551 break; 552 } 553 554 out: 555 556 return error; 557 } 558 559 /* --------------------------------------------------------------------- */ 560 561 static int 562 tmpfs_mappedwrite(vm_object_t tobj, size_t len, struct uio *uio) 563 { 564 vm_pindex_t idx; 565 vm_page_t tpg; 566 vm_offset_t offset; 567 off_t addr; 568 size_t tlen; 569 int error, rv; 570 571 error = 0; 572 573 addr = uio->uio_offset; 574 idx = OFF_TO_IDX(addr); 575 offset = addr & PAGE_MASK; 576 tlen = MIN(PAGE_SIZE - offset, len); 577 578 VM_OBJECT_WLOCK(tobj); 579 tpg = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 580 if (tpg->valid != VM_PAGE_BITS_ALL) { 581 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 582 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 583 tpg = vm_page_lookup(tobj, idx); 584 if (tpg == NULL) { 585 printf( 586 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 587 tobj, idx, rv); 588 return (EIO); 589 } 590 if (rv != VM_PAGER_OK) { 591 printf( 592 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 593 tobj, idx, tpg->valid, rv); 594 vm_page_lock(tpg); 595 vm_page_free(tpg); 596 vm_page_unlock(tpg); 597 VM_OBJECT_WUNLOCK(tobj); 598 return (EIO); 599 } 600 } else 601 vm_page_zero_invalid(tpg, TRUE); 602 } 603 vm_page_lock(tpg); 604 vm_page_hold(tpg); 605 vm_page_wakeup(tpg); 606 vm_page_unlock(tpg); 607 VM_OBJECT_WUNLOCK(tobj); 608 error = uiomove_fromphys(&tpg, offset, tlen, uio); 609 VM_OBJECT_WLOCK(tobj); 610 if (error == 0) 611 vm_page_dirty(tpg); 612 vm_page_lock(tpg); 613 vm_page_unhold(tpg); 614 if (tpg->queue == PQ_NONE) { 615 vm_page_deactivate(tpg); 616 } else { 617 /* Requeue to maintain LRU ordering. */ 618 vm_page_requeue(tpg); 619 } 620 vm_page_unlock(tpg); 621 VM_OBJECT_WUNLOCK(tobj); 622 623 return (error); 624 } 625 626 static int 627 tmpfs_write(struct vop_write_args *v) 628 { 629 struct vnode *vp = v->a_vp; 630 struct uio *uio = v->a_uio; 631 int ioflag = v->a_ioflag; 632 633 boolean_t extended; 634 int error = 0; 635 off_t oldsize; 636 struct tmpfs_node *node; 637 vm_object_t uobj; 638 size_t len; 639 int resid; 640 641 node = VP_TO_TMPFS_NODE(vp); 642 oldsize = node->tn_size; 643 644 if (uio->uio_offset < 0 || vp->v_type != VREG) { 645 error = EINVAL; 646 goto out; 647 } 648 649 if (uio->uio_resid == 0) { 650 error = 0; 651 goto out; 652 } 653 654 if (ioflag & IO_APPEND) 655 uio->uio_offset = node->tn_size; 656 657 if (uio->uio_offset + uio->uio_resid > 658 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 659 return (EFBIG); 660 661 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 662 return (EFBIG); 663 664 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 665 if (extended) { 666 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 667 FALSE); 668 if (error != 0) 669 goto out; 670 } 671 672 uobj = node->tn_reg.tn_aobj; 673 while ((resid = uio->uio_resid) > 0) { 674 if (node->tn_size <= uio->uio_offset) 675 break; 676 len = MIN(node->tn_size - uio->uio_offset, resid); 677 if (len == 0) 678 break; 679 error = tmpfs_mappedwrite(uobj, len, uio); 680 if ((error != 0) || (resid == uio->uio_resid)) 681 break; 682 } 683 684 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 685 (extended ? TMPFS_NODE_CHANGED : 0); 686 687 if (node->tn_mode & (S_ISUID | S_ISGID)) { 688 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 689 node->tn_mode &= ~(S_ISUID | S_ISGID); 690 } 691 692 if (error != 0) 693 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 694 695 out: 696 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 697 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 698 699 return error; 700 } 701 702 /* --------------------------------------------------------------------- */ 703 704 static int 705 tmpfs_fsync(struct vop_fsync_args *v) 706 { 707 struct vnode *vp = v->a_vp; 708 709 MPASS(VOP_ISLOCKED(vp)); 710 711 tmpfs_update(vp); 712 713 return 0; 714 } 715 716 /* --------------------------------------------------------------------- */ 717 718 static int 719 tmpfs_remove(struct vop_remove_args *v) 720 { 721 struct vnode *dvp = v->a_dvp; 722 struct vnode *vp = v->a_vp; 723 724 int error; 725 struct tmpfs_dirent *de; 726 struct tmpfs_mount *tmp; 727 struct tmpfs_node *dnode; 728 struct tmpfs_node *node; 729 730 MPASS(VOP_ISLOCKED(dvp)); 731 MPASS(VOP_ISLOCKED(vp)); 732 733 if (vp->v_type == VDIR) { 734 error = EISDIR; 735 goto out; 736 } 737 738 dnode = VP_TO_TMPFS_DIR(dvp); 739 node = VP_TO_TMPFS_NODE(vp); 740 tmp = VFS_TO_TMPFS(vp->v_mount); 741 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 742 MPASS(de != NULL); 743 744 /* Files marked as immutable or append-only cannot be deleted. */ 745 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 746 (dnode->tn_flags & APPEND)) { 747 error = EPERM; 748 goto out; 749 } 750 751 /* Remove the entry from the directory; as it is a file, we do not 752 * have to change the number of hard links of the directory. */ 753 tmpfs_dir_detach(dvp, de); 754 if (v->a_cnp->cn_flags & DOWHITEOUT) 755 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 756 757 /* Free the directory entry we just deleted. Note that the node 758 * referred by it will not be removed until the vnode is really 759 * reclaimed. */ 760 tmpfs_free_dirent(tmp, de); 761 762 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 763 error = 0; 764 765 out: 766 767 return error; 768 } 769 770 /* --------------------------------------------------------------------- */ 771 772 static int 773 tmpfs_link(struct vop_link_args *v) 774 { 775 struct vnode *dvp = v->a_tdvp; 776 struct vnode *vp = v->a_vp; 777 struct componentname *cnp = v->a_cnp; 778 779 int error; 780 struct tmpfs_dirent *de; 781 struct tmpfs_node *node; 782 783 MPASS(VOP_ISLOCKED(dvp)); 784 MPASS(cnp->cn_flags & HASBUF); 785 MPASS(dvp != vp); /* XXX When can this be false? */ 786 787 node = VP_TO_TMPFS_NODE(vp); 788 789 /* XXX: Why aren't the following two tests done by the caller? */ 790 791 /* Hard links of directories are forbidden. */ 792 if (vp->v_type == VDIR) { 793 error = EPERM; 794 goto out; 795 } 796 797 /* Cannot create cross-device links. */ 798 if (dvp->v_mount != vp->v_mount) { 799 error = EXDEV; 800 goto out; 801 } 802 803 /* Ensure that we do not overflow the maximum number of links imposed 804 * by the system. */ 805 MPASS(node->tn_links <= LINK_MAX); 806 if (node->tn_links == LINK_MAX) { 807 error = EMLINK; 808 goto out; 809 } 810 811 /* We cannot create links of files marked immutable or append-only. */ 812 if (node->tn_flags & (IMMUTABLE | APPEND)) { 813 error = EPERM; 814 goto out; 815 } 816 817 /* Allocate a new directory entry to represent the node. */ 818 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 819 cnp->cn_nameptr, cnp->cn_namelen, &de); 820 if (error != 0) 821 goto out; 822 823 /* Insert the new directory entry into the appropriate directory. */ 824 if (cnp->cn_flags & ISWHITEOUT) 825 tmpfs_dir_whiteout_remove(dvp, cnp); 826 tmpfs_dir_attach(dvp, de); 827 828 /* vp link count has changed, so update node times. */ 829 node->tn_status |= TMPFS_NODE_CHANGED; 830 tmpfs_update(vp); 831 832 error = 0; 833 834 out: 835 return error; 836 } 837 838 /* --------------------------------------------------------------------- */ 839 840 /* 841 * We acquire all but fdvp locks using non-blocking acquisitions. If we 842 * fail to acquire any lock in the path we will drop all held locks, 843 * acquire the new lock in a blocking fashion, and then release it and 844 * restart the rename. This acquire/release step ensures that we do not 845 * spin on a lock waiting for release. On error release all vnode locks 846 * and decrement references the way tmpfs_rename() would do. 847 */ 848 static int 849 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 850 struct vnode *tdvp, struct vnode **tvpp, 851 struct componentname *fcnp, struct componentname *tcnp) 852 { 853 struct vnode *nvp; 854 struct mount *mp; 855 struct tmpfs_dirent *de; 856 int error, restarts = 0; 857 858 VOP_UNLOCK(tdvp, 0); 859 if (*tvpp != NULL && *tvpp != tdvp) 860 VOP_UNLOCK(*tvpp, 0); 861 mp = fdvp->v_mount; 862 863 relock: 864 restarts += 1; 865 error = vn_lock(fdvp, LK_EXCLUSIVE); 866 if (error) 867 goto releout; 868 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 869 VOP_UNLOCK(fdvp, 0); 870 error = vn_lock(tdvp, LK_EXCLUSIVE); 871 if (error) 872 goto releout; 873 VOP_UNLOCK(tdvp, 0); 874 goto relock; 875 } 876 /* 877 * Re-resolve fvp to be certain it still exists and fetch the 878 * correct vnode. 879 */ 880 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 881 if (de == NULL) { 882 VOP_UNLOCK(fdvp, 0); 883 VOP_UNLOCK(tdvp, 0); 884 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 885 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 886 error = EINVAL; 887 else 888 error = ENOENT; 889 goto releout; 890 } 891 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 892 if (error != 0) { 893 VOP_UNLOCK(fdvp, 0); 894 VOP_UNLOCK(tdvp, 0); 895 if (error != EBUSY) 896 goto releout; 897 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 898 if (error != 0) 899 goto releout; 900 VOP_UNLOCK(nvp, 0); 901 /* 902 * Concurrent rename race. 903 */ 904 if (nvp == tdvp) { 905 vrele(nvp); 906 error = EINVAL; 907 goto releout; 908 } 909 vrele(*fvpp); 910 *fvpp = nvp; 911 goto relock; 912 } 913 vrele(*fvpp); 914 *fvpp = nvp; 915 VOP_UNLOCK(*fvpp, 0); 916 /* 917 * Re-resolve tvp and acquire the vnode lock if present. 918 */ 919 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 920 /* 921 * If tvp disappeared we just carry on. 922 */ 923 if (de == NULL && *tvpp != NULL) { 924 vrele(*tvpp); 925 *tvpp = NULL; 926 } 927 /* 928 * Get the tvp ino if the lookup succeeded. We may have to restart 929 * if the non-blocking acquire fails. 930 */ 931 if (de != NULL) { 932 nvp = NULL; 933 error = tmpfs_alloc_vp(mp, de->td_node, 934 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 935 if (*tvpp != NULL) 936 vrele(*tvpp); 937 *tvpp = nvp; 938 if (error != 0) { 939 VOP_UNLOCK(fdvp, 0); 940 VOP_UNLOCK(tdvp, 0); 941 if (error != EBUSY) 942 goto releout; 943 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 944 &nvp); 945 if (error != 0) 946 goto releout; 947 VOP_UNLOCK(nvp, 0); 948 /* 949 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 950 */ 951 if (nvp == fdvp) { 952 error = ENOTEMPTY; 953 goto releout; 954 } 955 goto relock; 956 } 957 } 958 tmpfs_rename_restarts += restarts; 959 960 return (0); 961 962 releout: 963 vrele(fdvp); 964 vrele(*fvpp); 965 vrele(tdvp); 966 if (*tvpp != NULL) 967 vrele(*tvpp); 968 tmpfs_rename_restarts += restarts; 969 970 return (error); 971 } 972 973 static int 974 tmpfs_rename(struct vop_rename_args *v) 975 { 976 struct vnode *fdvp = v->a_fdvp; 977 struct vnode *fvp = v->a_fvp; 978 struct componentname *fcnp = v->a_fcnp; 979 struct vnode *tdvp = v->a_tdvp; 980 struct vnode *tvp = v->a_tvp; 981 struct componentname *tcnp = v->a_tcnp; 982 struct mount *mp = NULL; 983 984 char *newname; 985 int error; 986 struct tmpfs_dirent *de; 987 struct tmpfs_mount *tmp; 988 struct tmpfs_node *fdnode; 989 struct tmpfs_node *fnode; 990 struct tmpfs_node *tnode; 991 struct tmpfs_node *tdnode; 992 993 MPASS(VOP_ISLOCKED(tdvp)); 994 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 995 MPASS(fcnp->cn_flags & HASBUF); 996 MPASS(tcnp->cn_flags & HASBUF); 997 998 /* Disallow cross-device renames. 999 * XXX Why isn't this done by the caller? */ 1000 if (fvp->v_mount != tdvp->v_mount || 1001 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1002 error = EXDEV; 1003 goto out; 1004 } 1005 1006 /* If source and target are the same file, there is nothing to do. */ 1007 if (fvp == tvp) { 1008 error = 0; 1009 goto out; 1010 } 1011 1012 /* If we need to move the directory between entries, lock the 1013 * source so that we can safely operate on it. */ 1014 if (fdvp != tdvp && fdvp != tvp) { 1015 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1016 mp = tdvp->v_mount; 1017 error = vfs_busy(mp, 0); 1018 if (error != 0) { 1019 mp = NULL; 1020 goto out; 1021 } 1022 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1023 fcnp, tcnp); 1024 if (error != 0) { 1025 vfs_unbusy(mp); 1026 return (error); 1027 } 1028 ASSERT_VOP_ELOCKED(fdvp, 1029 "tmpfs_rename: fdvp not locked"); 1030 ASSERT_VOP_ELOCKED(tdvp, 1031 "tmpfs_rename: tdvp not locked"); 1032 if (tvp != NULL) 1033 ASSERT_VOP_ELOCKED(tvp, 1034 "tmpfs_rename: tvp not locked"); 1035 if (fvp == tvp) { 1036 error = 0; 1037 goto out_locked; 1038 } 1039 } 1040 } 1041 1042 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1043 tdnode = VP_TO_TMPFS_DIR(tdvp); 1044 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1045 fdnode = VP_TO_TMPFS_DIR(fdvp); 1046 fnode = VP_TO_TMPFS_NODE(fvp); 1047 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1048 1049 /* Entry can disappear before we lock fdvp, 1050 * also avoid manipulating '.' and '..' entries. */ 1051 if (de == NULL) { 1052 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1053 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1054 error = EINVAL; 1055 else 1056 error = ENOENT; 1057 goto out_locked; 1058 } 1059 MPASS(de->td_node == fnode); 1060 1061 /* If re-naming a directory to another preexisting directory 1062 * ensure that the target directory is empty so that its 1063 * removal causes no side effects. 1064 * Kern_rename gurantees the destination to be a directory 1065 * if the source is one. */ 1066 if (tvp != NULL) { 1067 MPASS(tnode != NULL); 1068 1069 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1070 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1071 error = EPERM; 1072 goto out_locked; 1073 } 1074 1075 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1076 if (tnode->tn_size > 0) { 1077 error = ENOTEMPTY; 1078 goto out_locked; 1079 } 1080 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1081 error = ENOTDIR; 1082 goto out_locked; 1083 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1084 error = EISDIR; 1085 goto out_locked; 1086 } else { 1087 MPASS(fnode->tn_type != VDIR && 1088 tnode->tn_type != VDIR); 1089 } 1090 } 1091 1092 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1093 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1094 error = EPERM; 1095 goto out_locked; 1096 } 1097 1098 /* Ensure that we have enough memory to hold the new name, if it 1099 * has to be changed. */ 1100 if (fcnp->cn_namelen != tcnp->cn_namelen || 1101 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1102 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1103 } else 1104 newname = NULL; 1105 1106 /* If the node is being moved to another directory, we have to do 1107 * the move. */ 1108 if (fdnode != tdnode) { 1109 /* In case we are moving a directory, we have to adjust its 1110 * parent to point to the new parent. */ 1111 if (de->td_node->tn_type == VDIR) { 1112 struct tmpfs_node *n; 1113 1114 /* Ensure the target directory is not a child of the 1115 * directory being moved. Otherwise, we'd end up 1116 * with stale nodes. */ 1117 n = tdnode; 1118 /* TMPFS_LOCK garanties that no nodes are freed while 1119 * traversing the list. Nodes can only be marked as 1120 * removed: tn_parent == NULL. */ 1121 TMPFS_LOCK(tmp); 1122 TMPFS_NODE_LOCK(n); 1123 while (n != n->tn_dir.tn_parent) { 1124 struct tmpfs_node *parent; 1125 1126 if (n == fnode) { 1127 TMPFS_NODE_UNLOCK(n); 1128 TMPFS_UNLOCK(tmp); 1129 error = EINVAL; 1130 if (newname != NULL) 1131 free(newname, M_TMPFSNAME); 1132 goto out_locked; 1133 } 1134 parent = n->tn_dir.tn_parent; 1135 TMPFS_NODE_UNLOCK(n); 1136 if (parent == NULL) { 1137 n = NULL; 1138 break; 1139 } 1140 TMPFS_NODE_LOCK(parent); 1141 if (parent->tn_dir.tn_parent == NULL) { 1142 TMPFS_NODE_UNLOCK(parent); 1143 n = NULL; 1144 break; 1145 } 1146 n = parent; 1147 } 1148 TMPFS_UNLOCK(tmp); 1149 if (n == NULL) { 1150 error = EINVAL; 1151 if (newname != NULL) 1152 free(newname, M_TMPFSNAME); 1153 goto out_locked; 1154 } 1155 TMPFS_NODE_UNLOCK(n); 1156 1157 /* Adjust the parent pointer. */ 1158 TMPFS_VALIDATE_DIR(fnode); 1159 TMPFS_NODE_LOCK(de->td_node); 1160 de->td_node->tn_dir.tn_parent = tdnode; 1161 TMPFS_NODE_UNLOCK(de->td_node); 1162 1163 /* As a result of changing the target of the '..' 1164 * entry, the link count of the source and target 1165 * directories has to be adjusted. */ 1166 TMPFS_NODE_LOCK(tdnode); 1167 TMPFS_ASSERT_LOCKED(tdnode); 1168 tdnode->tn_links++; 1169 TMPFS_NODE_UNLOCK(tdnode); 1170 1171 TMPFS_NODE_LOCK(fdnode); 1172 TMPFS_ASSERT_LOCKED(fdnode); 1173 fdnode->tn_links--; 1174 TMPFS_NODE_UNLOCK(fdnode); 1175 } 1176 } 1177 1178 /* Do the move: just remove the entry from the source directory 1179 * and insert it into the target one. */ 1180 tmpfs_dir_detach(fdvp, de); 1181 1182 if (fcnp->cn_flags & DOWHITEOUT) 1183 tmpfs_dir_whiteout_add(fdvp, fcnp); 1184 if (tcnp->cn_flags & ISWHITEOUT) 1185 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1186 1187 /* If the name has changed, we need to make it effective by changing 1188 * it in the directory entry. */ 1189 if (newname != NULL) { 1190 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1191 1192 free(de->ud.td_name, M_TMPFSNAME); 1193 de->ud.td_name = newname; 1194 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1195 1196 fnode->tn_status |= TMPFS_NODE_CHANGED; 1197 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1198 } 1199 1200 /* If we are overwriting an entry, we have to remove the old one 1201 * from the target directory. */ 1202 if (tvp != NULL) { 1203 struct tmpfs_dirent *tde; 1204 1205 /* Remove the old entry from the target directory. */ 1206 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1207 tmpfs_dir_detach(tdvp, tde); 1208 1209 /* Free the directory entry we just deleted. Note that the 1210 * node referred by it will not be removed until the vnode is 1211 * really reclaimed. */ 1212 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1213 } 1214 1215 tmpfs_dir_attach(tdvp, de); 1216 1217 cache_purge(fvp); 1218 if (tvp != NULL) 1219 cache_purge(tvp); 1220 cache_purge_negative(tdvp); 1221 1222 error = 0; 1223 1224 out_locked: 1225 if (fdvp != tdvp && fdvp != tvp) 1226 VOP_UNLOCK(fdvp, 0); 1227 1228 out: 1229 /* Release target nodes. */ 1230 /* XXX: I don't understand when tdvp can be the same as tvp, but 1231 * other code takes care of this... */ 1232 if (tdvp == tvp) 1233 vrele(tdvp); 1234 else 1235 vput(tdvp); 1236 if (tvp != NULL) 1237 vput(tvp); 1238 1239 /* Release source nodes. */ 1240 vrele(fdvp); 1241 vrele(fvp); 1242 1243 if (mp != NULL) 1244 vfs_unbusy(mp); 1245 1246 return error; 1247 } 1248 1249 /* --------------------------------------------------------------------- */ 1250 1251 static int 1252 tmpfs_mkdir(struct vop_mkdir_args *v) 1253 { 1254 struct vnode *dvp = v->a_dvp; 1255 struct vnode **vpp = v->a_vpp; 1256 struct componentname *cnp = v->a_cnp; 1257 struct vattr *vap = v->a_vap; 1258 1259 MPASS(vap->va_type == VDIR); 1260 1261 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1262 } 1263 1264 /* --------------------------------------------------------------------- */ 1265 1266 static int 1267 tmpfs_rmdir(struct vop_rmdir_args *v) 1268 { 1269 struct vnode *dvp = v->a_dvp; 1270 struct vnode *vp = v->a_vp; 1271 1272 int error; 1273 struct tmpfs_dirent *de; 1274 struct tmpfs_mount *tmp; 1275 struct tmpfs_node *dnode; 1276 struct tmpfs_node *node; 1277 1278 MPASS(VOP_ISLOCKED(dvp)); 1279 MPASS(VOP_ISLOCKED(vp)); 1280 1281 tmp = VFS_TO_TMPFS(dvp->v_mount); 1282 dnode = VP_TO_TMPFS_DIR(dvp); 1283 node = VP_TO_TMPFS_DIR(vp); 1284 1285 /* Directories with more than two entries ('.' and '..') cannot be 1286 * removed. */ 1287 if (node->tn_size > 0) { 1288 error = ENOTEMPTY; 1289 goto out; 1290 } 1291 1292 if ((dnode->tn_flags & APPEND) 1293 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1294 error = EPERM; 1295 goto out; 1296 } 1297 1298 /* This invariant holds only if we are not trying to remove "..". 1299 * We checked for that above so this is safe now. */ 1300 MPASS(node->tn_dir.tn_parent == dnode); 1301 1302 /* Get the directory entry associated with node (vp). This was 1303 * filled by tmpfs_lookup while looking up the entry. */ 1304 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1305 MPASS(TMPFS_DIRENT_MATCHES(de, 1306 v->a_cnp->cn_nameptr, 1307 v->a_cnp->cn_namelen)); 1308 1309 /* Check flags to see if we are allowed to remove the directory. */ 1310 if (dnode->tn_flags & APPEND 1311 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1312 error = EPERM; 1313 goto out; 1314 } 1315 1316 1317 /* Detach the directory entry from the directory (dnode). */ 1318 tmpfs_dir_detach(dvp, de); 1319 if (v->a_cnp->cn_flags & DOWHITEOUT) 1320 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1321 1322 /* No vnode should be allocated for this entry from this point */ 1323 TMPFS_NODE_LOCK(node); 1324 TMPFS_ASSERT_ELOCKED(node); 1325 node->tn_links--; 1326 node->tn_dir.tn_parent = NULL; 1327 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1328 TMPFS_NODE_MODIFIED; 1329 1330 TMPFS_NODE_UNLOCK(node); 1331 1332 TMPFS_NODE_LOCK(dnode); 1333 TMPFS_ASSERT_ELOCKED(dnode); 1334 dnode->tn_links--; 1335 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1336 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1337 TMPFS_NODE_UNLOCK(dnode); 1338 1339 cache_purge(dvp); 1340 cache_purge(vp); 1341 1342 /* Free the directory entry we just deleted. Note that the node 1343 * referred by it will not be removed until the vnode is really 1344 * reclaimed. */ 1345 tmpfs_free_dirent(tmp, de); 1346 1347 /* Release the deleted vnode (will destroy the node, notify 1348 * interested parties and clean it from the cache). */ 1349 1350 dnode->tn_status |= TMPFS_NODE_CHANGED; 1351 tmpfs_update(dvp); 1352 1353 error = 0; 1354 1355 out: 1356 return error; 1357 } 1358 1359 /* --------------------------------------------------------------------- */ 1360 1361 static int 1362 tmpfs_symlink(struct vop_symlink_args *v) 1363 { 1364 struct vnode *dvp = v->a_dvp; 1365 struct vnode **vpp = v->a_vpp; 1366 struct componentname *cnp = v->a_cnp; 1367 struct vattr *vap = v->a_vap; 1368 char *target = v->a_target; 1369 1370 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1371 MPASS(vap->va_type == VLNK); 1372 #else 1373 vap->va_type = VLNK; 1374 #endif 1375 1376 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1377 } 1378 1379 /* --------------------------------------------------------------------- */ 1380 1381 static int 1382 tmpfs_readdir(struct vop_readdir_args *v) 1383 { 1384 struct vnode *vp = v->a_vp; 1385 struct uio *uio = v->a_uio; 1386 int *eofflag = v->a_eofflag; 1387 u_long **cookies = v->a_cookies; 1388 int *ncookies = v->a_ncookies; 1389 1390 int error; 1391 ssize_t startresid; 1392 int cnt = 0; 1393 struct tmpfs_node *node; 1394 1395 /* This operation only makes sense on directory nodes. */ 1396 if (vp->v_type != VDIR) 1397 return ENOTDIR; 1398 1399 node = VP_TO_TMPFS_DIR(vp); 1400 1401 startresid = uio->uio_resid; 1402 1403 if (cookies != NULL && ncookies != NULL) { 1404 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1405 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1406 *ncookies = 0; 1407 } 1408 1409 if (cnt == 0) 1410 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1411 else 1412 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1413 1414 if (error == EJUSTRETURN) 1415 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1416 1417 if (error != 0 && cnt != 0) 1418 free(*cookies, M_TEMP); 1419 1420 if (eofflag != NULL) 1421 *eofflag = 1422 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1423 1424 return error; 1425 } 1426 1427 /* --------------------------------------------------------------------- */ 1428 1429 static int 1430 tmpfs_readlink(struct vop_readlink_args *v) 1431 { 1432 struct vnode *vp = v->a_vp; 1433 struct uio *uio = v->a_uio; 1434 1435 int error; 1436 struct tmpfs_node *node; 1437 1438 MPASS(uio->uio_offset == 0); 1439 MPASS(vp->v_type == VLNK); 1440 1441 node = VP_TO_TMPFS_NODE(vp); 1442 1443 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1444 uio); 1445 node->tn_status |= TMPFS_NODE_ACCESSED; 1446 1447 return error; 1448 } 1449 1450 /* --------------------------------------------------------------------- */ 1451 1452 static int 1453 tmpfs_inactive(struct vop_inactive_args *v) 1454 { 1455 struct vnode *vp = v->a_vp; 1456 1457 struct tmpfs_node *node; 1458 1459 node = VP_TO_TMPFS_NODE(vp); 1460 1461 if (node->tn_links == 0) 1462 vrecycle(vp); 1463 1464 return 0; 1465 } 1466 1467 /* --------------------------------------------------------------------- */ 1468 1469 int 1470 tmpfs_reclaim(struct vop_reclaim_args *v) 1471 { 1472 struct vnode *vp = v->a_vp; 1473 1474 struct tmpfs_mount *tmp; 1475 struct tmpfs_node *node; 1476 1477 node = VP_TO_TMPFS_NODE(vp); 1478 tmp = VFS_TO_TMPFS(vp->v_mount); 1479 1480 if (vp->v_type == VREG) 1481 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1482 else 1483 vnode_destroy_vobject(vp); 1484 vp->v_object = NULL; 1485 cache_purge(vp); 1486 1487 TMPFS_NODE_LOCK(node); 1488 TMPFS_ASSERT_ELOCKED(node); 1489 tmpfs_free_vp(vp); 1490 1491 /* If the node referenced by this vnode was deleted by the user, 1492 * we must free its associated data structures (now that the vnode 1493 * is being reclaimed). */ 1494 if (node->tn_links == 0 && 1495 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1496 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1497 TMPFS_NODE_UNLOCK(node); 1498 tmpfs_free_node(tmp, node); 1499 } else 1500 TMPFS_NODE_UNLOCK(node); 1501 1502 MPASS(vp->v_data == NULL); 1503 return 0; 1504 } 1505 1506 /* --------------------------------------------------------------------- */ 1507 1508 static int 1509 tmpfs_print(struct vop_print_args *v) 1510 { 1511 struct vnode *vp = v->a_vp; 1512 1513 struct tmpfs_node *node; 1514 1515 node = VP_TO_TMPFS_NODE(vp); 1516 1517 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1518 node, node->tn_flags, node->tn_links); 1519 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1520 node->tn_mode, node->tn_uid, node->tn_gid, 1521 (intmax_t)node->tn_size, node->tn_status); 1522 1523 if (vp->v_type == VFIFO) 1524 fifo_printinfo(vp); 1525 1526 printf("\n"); 1527 1528 return 0; 1529 } 1530 1531 /* --------------------------------------------------------------------- */ 1532 1533 static int 1534 tmpfs_pathconf(struct vop_pathconf_args *v) 1535 { 1536 int name = v->a_name; 1537 register_t *retval = v->a_retval; 1538 1539 int error; 1540 1541 error = 0; 1542 1543 switch (name) { 1544 case _PC_LINK_MAX: 1545 *retval = LINK_MAX; 1546 break; 1547 1548 case _PC_NAME_MAX: 1549 *retval = NAME_MAX; 1550 break; 1551 1552 case _PC_PATH_MAX: 1553 *retval = PATH_MAX; 1554 break; 1555 1556 case _PC_PIPE_BUF: 1557 *retval = PIPE_BUF; 1558 break; 1559 1560 case _PC_CHOWN_RESTRICTED: 1561 *retval = 1; 1562 break; 1563 1564 case _PC_NO_TRUNC: 1565 *retval = 1; 1566 break; 1567 1568 case _PC_SYNC_IO: 1569 *retval = 1; 1570 break; 1571 1572 case _PC_FILESIZEBITS: 1573 *retval = 0; /* XXX Don't know which value should I return. */ 1574 break; 1575 1576 default: 1577 error = EINVAL; 1578 } 1579 1580 return error; 1581 } 1582 1583 static int 1584 tmpfs_vptofh(struct vop_vptofh_args *ap) 1585 { 1586 struct tmpfs_fid *tfhp; 1587 struct tmpfs_node *node; 1588 1589 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1590 node = VP_TO_TMPFS_NODE(ap->a_vp); 1591 1592 tfhp->tf_len = sizeof(struct tmpfs_fid); 1593 tfhp->tf_id = node->tn_id; 1594 tfhp->tf_gen = node->tn_gen; 1595 1596 return (0); 1597 } 1598 1599 static int 1600 tmpfs_whiteout(struct vop_whiteout_args *ap) 1601 { 1602 struct vnode *dvp = ap->a_dvp; 1603 struct componentname *cnp = ap->a_cnp; 1604 struct tmpfs_dirent *de; 1605 1606 switch (ap->a_flags) { 1607 case LOOKUP: 1608 return (0); 1609 case CREATE: 1610 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1611 if (de != NULL) 1612 return (de->td_node == NULL ? 0 : EEXIST); 1613 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1614 case DELETE: 1615 tmpfs_dir_whiteout_remove(dvp, cnp); 1616 return (0); 1617 default: 1618 panic("tmpfs_whiteout: unknown op"); 1619 } 1620 } 1621 1622 /* --------------------------------------------------------------------- */ 1623 1624 /* 1625 * vnode operations vector used for files stored in a tmpfs file system. 1626 */ 1627 struct vop_vector tmpfs_vnodeop_entries = { 1628 .vop_default = &default_vnodeops, 1629 .vop_lookup = vfs_cache_lookup, 1630 .vop_cachedlookup = tmpfs_lookup, 1631 .vop_create = tmpfs_create, 1632 .vop_mknod = tmpfs_mknod, 1633 .vop_open = tmpfs_open, 1634 .vop_close = tmpfs_close, 1635 .vop_access = tmpfs_access, 1636 .vop_getattr = tmpfs_getattr, 1637 .vop_setattr = tmpfs_setattr, 1638 .vop_read = tmpfs_read, 1639 .vop_write = tmpfs_write, 1640 .vop_fsync = tmpfs_fsync, 1641 .vop_remove = tmpfs_remove, 1642 .vop_link = tmpfs_link, 1643 .vop_rename = tmpfs_rename, 1644 .vop_mkdir = tmpfs_mkdir, 1645 .vop_rmdir = tmpfs_rmdir, 1646 .vop_symlink = tmpfs_symlink, 1647 .vop_readdir = tmpfs_readdir, 1648 .vop_readlink = tmpfs_readlink, 1649 .vop_inactive = tmpfs_inactive, 1650 .vop_reclaim = tmpfs_reclaim, 1651 .vop_print = tmpfs_print, 1652 .vop_pathconf = tmpfs_pathconf, 1653 .vop_vptofh = tmpfs_vptofh, 1654 .vop_whiteout = tmpfs_whiteout, 1655 .vop_bmap = VOP_EOPNOTSUPP, 1656 }; 1657 1658