tmpfs_vnops.c revision 250030
1/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3/*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * tmpfs vnode interface. 35 */ 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vnops.c 250030 2013-04-28 19:38:59Z kib $"); 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 64SYSCTL_DECL(_vfs_tmpfs); 65 66static volatile int tmpfs_rename_restarts; 67SYSCTL_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 73static int 74tmpfs_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 202out: 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 212static int 213tmpfs_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 226static int 227tmpfs_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 243static int 244tmpfs_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 276static int 277tmpfs_close(struct vop_close_args *v) 278{ 279 struct vnode *vp = v->a_vp; 280 281 /* Update node times. */ 282 tmpfs_update(vp); 283 284 return (0); 285} 286 287/* --------------------------------------------------------------------- */ 288 289int 290tmpfs_access(struct vop_access_args *v) 291{ 292 struct vnode *vp = v->a_vp; 293 accmode_t accmode = v->a_accmode; 294 struct ucred *cred = v->a_cred; 295 296 int error; 297 struct tmpfs_node *node; 298 299 MPASS(VOP_ISLOCKED(vp)); 300 301 node = VP_TO_TMPFS_NODE(vp); 302 303 switch (vp->v_type) { 304 case VDIR: 305 /* FALLTHROUGH */ 306 case VLNK: 307 /* FALLTHROUGH */ 308 case VREG: 309 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 310 error = EROFS; 311 goto out; 312 } 313 break; 314 315 case VBLK: 316 /* FALLTHROUGH */ 317 case VCHR: 318 /* FALLTHROUGH */ 319 case VSOCK: 320 /* FALLTHROUGH */ 321 case VFIFO: 322 break; 323 324 default: 325 error = EINVAL; 326 goto out; 327 } 328 329 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 330 error = EPERM; 331 goto out; 332 } 333 334 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 335 node->tn_gid, accmode, cred, NULL); 336 337out: 338 MPASS(VOP_ISLOCKED(vp)); 339 340 return error; 341} 342 343/* --------------------------------------------------------------------- */ 344 345int 346tmpfs_getattr(struct vop_getattr_args *v) 347{ 348 struct vnode *vp = v->a_vp; 349 struct vattr *vap = v->a_vap; 350 351 struct tmpfs_node *node; 352 353 node = VP_TO_TMPFS_NODE(vp); 354 355 tmpfs_update(vp); 356 357 vap->va_type = vp->v_type; 358 vap->va_mode = node->tn_mode; 359 vap->va_nlink = node->tn_links; 360 vap->va_uid = node->tn_uid; 361 vap->va_gid = node->tn_gid; 362 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 363 vap->va_fileid = node->tn_id; 364 vap->va_size = node->tn_size; 365 vap->va_blocksize = PAGE_SIZE; 366 vap->va_atime = node->tn_atime; 367 vap->va_mtime = node->tn_mtime; 368 vap->va_ctime = node->tn_ctime; 369 vap->va_birthtime = node->tn_birthtime; 370 vap->va_gen = node->tn_gen; 371 vap->va_flags = node->tn_flags; 372 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 373 node->tn_rdev : NODEV; 374 vap->va_bytes = round_page(node->tn_size); 375 vap->va_filerev = 0; 376 377 return 0; 378} 379 380/* --------------------------------------------------------------------- */ 381 382/* XXX Should this operation be atomic? I think it should, but code in 383 * XXX other places (e.g., ufs) doesn't seem to be... */ 384int 385tmpfs_setattr(struct vop_setattr_args *v) 386{ 387 struct vnode *vp = v->a_vp; 388 struct vattr *vap = v->a_vap; 389 struct ucred *cred = v->a_cred; 390 struct thread *td = curthread; 391 392 int error; 393 394 MPASS(VOP_ISLOCKED(vp)); 395 396 error = 0; 397 398 /* Abort if any unsettable attribute is given. */ 399 if (vap->va_type != VNON || 400 vap->va_nlink != VNOVAL || 401 vap->va_fsid != VNOVAL || 402 vap->va_fileid != VNOVAL || 403 vap->va_blocksize != VNOVAL || 404 vap->va_gen != VNOVAL || 405 vap->va_rdev != VNOVAL || 406 vap->va_bytes != VNOVAL) 407 error = EINVAL; 408 409 if (error == 0 && (vap->va_flags != VNOVAL)) 410 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 411 412 if (error == 0 && (vap->va_size != VNOVAL)) 413 error = tmpfs_chsize(vp, vap->va_size, cred, td); 414 415 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 416 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 417 418 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 419 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 420 421 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 422 vap->va_atime.tv_nsec != VNOVAL) || 423 (vap->va_mtime.tv_sec != VNOVAL && 424 vap->va_mtime.tv_nsec != VNOVAL) || 425 (vap->va_birthtime.tv_sec != VNOVAL && 426 vap->va_birthtime.tv_nsec != VNOVAL))) 427 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 428 &vap->va_birthtime, vap->va_vaflags, cred, td); 429 430 /* Update the node times. We give preference to the error codes 431 * generated by this function rather than the ones that may arise 432 * from tmpfs_update. */ 433 tmpfs_update(vp); 434 435 MPASS(VOP_ISLOCKED(vp)); 436 437 return error; 438} 439 440static int 441tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx, 442 vm_offset_t offset, size_t tlen, struct uio *uio) 443{ 444 vm_page_t m; 445 int error, rv; 446 447 VM_OBJECT_WLOCK(tobj); 448 449 /* 450 * The kern_sendfile() code calls vn_rdwr() with the page 451 * soft-busied. Ignore the soft-busy state here. Parallel 452 * reads of the page content from disk are prevented by 453 * VPO_BUSY. 454 * 455 * Although the tmpfs vnode lock is held here, it is 456 * nonetheless safe to sleep waiting for a free page. The 457 * pageout daemon does not need to acquire the tmpfs vnode 458 * lock to page out tobj's pages because tobj is a OBJT_SWAP 459 * type object. 460 */ 461 m = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY | 462 VM_ALLOC_IGN_SBUSY); 463 if (m->valid != VM_PAGE_BITS_ALL) { 464 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 465 rv = vm_pager_get_pages(tobj, &m, 1, 0); 466 m = vm_page_lookup(tobj, idx); 467 if (m == NULL) { 468 printf( 469 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 470 tobj, idx, rv); 471 return (EIO); 472 } 473 if (rv != VM_PAGER_OK) { 474 printf( 475 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 476 tobj, idx, m->valid, rv); 477 vm_page_lock(m); 478 vm_page_free(m); 479 vm_page_unlock(m); 480 VM_OBJECT_WUNLOCK(tobj); 481 return (EIO); 482 } 483 } else 484 vm_page_zero_invalid(m, TRUE); 485 } 486 vm_page_lock(m); 487 vm_page_hold(m); 488 vm_page_wakeup(m); 489 vm_page_unlock(m); 490 VM_OBJECT_WUNLOCK(tobj); 491 error = uiomove_fromphys(&m, offset, tlen, uio); 492 VM_OBJECT_WLOCK(tobj); 493 vm_page_lock(m); 494 vm_page_unhold(m); 495 vm_page_deactivate(m); 496 /* Requeue to maintain LRU ordering. */ 497 vm_page_requeue(m); 498 vm_page_unlock(m); 499 VM_OBJECT_WUNLOCK(tobj); 500 501 return (error); 502} 503 504static int 505tmpfs_read(struct vop_read_args *v) 506{ 507 struct vnode *vp = v->a_vp; 508 struct uio *uio = v->a_uio; 509 struct tmpfs_node *node; 510 vm_object_t uobj; 511 size_t len; 512 int resid; 513 int error = 0; 514 vm_pindex_t idx; 515 vm_offset_t offset; 516 off_t addr; 517 size_t tlen; 518 519 node = VP_TO_TMPFS_NODE(vp); 520 521 if (vp->v_type != VREG) { 522 error = EISDIR; 523 goto out; 524 } 525 526 if (uio->uio_offset < 0) { 527 error = EINVAL; 528 goto out; 529 } 530 531 node->tn_status |= TMPFS_NODE_ACCESSED; 532 533 uobj = node->tn_reg.tn_aobj; 534 while ((resid = uio->uio_resid) > 0) { 535 error = 0; 536 if (node->tn_size <= uio->uio_offset) 537 break; 538 len = MIN(node->tn_size - uio->uio_offset, resid); 539 if (len == 0) 540 break; 541 addr = uio->uio_offset; 542 idx = OFF_TO_IDX(addr); 543 offset = addr & PAGE_MASK; 544 tlen = MIN(PAGE_SIZE - offset, len); 545 error = tmpfs_nocacheread(uobj, idx, offset, tlen, uio); 546 if ((error != 0) || (resid == uio->uio_resid)) 547 break; 548 } 549 550out: 551 552 return error; 553} 554 555/* --------------------------------------------------------------------- */ 556 557static int 558tmpfs_mappedwrite(vm_object_t tobj, size_t len, struct uio *uio) 559{ 560 vm_pindex_t idx; 561 vm_page_t tpg; 562 vm_offset_t offset; 563 off_t addr; 564 size_t tlen; 565 int error, rv; 566 567 error = 0; 568 569 addr = uio->uio_offset; 570 idx = OFF_TO_IDX(addr); 571 offset = addr & PAGE_MASK; 572 tlen = MIN(PAGE_SIZE - offset, len); 573 574 VM_OBJECT_WLOCK(tobj); 575 tpg = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 576 if (tpg->valid != VM_PAGE_BITS_ALL) { 577 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 578 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 579 tpg = vm_page_lookup(tobj, idx); 580 if (tpg == NULL) { 581 printf( 582 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 583 tobj, idx, rv); 584 return (EIO); 585 } 586 if (rv != VM_PAGER_OK) { 587 printf( 588 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 589 tobj, idx, tpg->valid, rv); 590 vm_page_lock(tpg); 591 vm_page_free(tpg); 592 vm_page_unlock(tpg); 593 VM_OBJECT_WUNLOCK(tobj); 594 return (EIO); 595 } 596 } else 597 vm_page_zero_invalid(tpg, TRUE); 598 } 599 vm_page_lock(tpg); 600 vm_page_hold(tpg); 601 vm_page_wakeup(tpg); 602 vm_page_unlock(tpg); 603 VM_OBJECT_WUNLOCK(tobj); 604 error = uiomove_fromphys(&tpg, offset, tlen, uio); 605 VM_OBJECT_WLOCK(tobj); 606 if (error == 0) 607 vm_page_dirty(tpg); 608 vm_page_lock(tpg); 609 vm_page_unhold(tpg); 610 vm_page_deactivate(tpg); 611 /* Requeue to maintain LRU ordering. */ 612 vm_page_requeue(tpg); 613 vm_page_unlock(tpg); 614 VM_OBJECT_WUNLOCK(tobj); 615 616 return (error); 617} 618 619static int 620tmpfs_write(struct vop_write_args *v) 621{ 622 struct vnode *vp = v->a_vp; 623 struct uio *uio = v->a_uio; 624 int ioflag = v->a_ioflag; 625 626 boolean_t extended; 627 int error = 0; 628 off_t oldsize; 629 struct tmpfs_node *node; 630 vm_object_t uobj; 631 size_t len; 632 int resid; 633 634 node = VP_TO_TMPFS_NODE(vp); 635 oldsize = node->tn_size; 636 637 if (uio->uio_offset < 0 || vp->v_type != VREG) { 638 error = EINVAL; 639 goto out; 640 } 641 642 if (uio->uio_resid == 0) { 643 error = 0; 644 goto out; 645 } 646 647 if (ioflag & IO_APPEND) 648 uio->uio_offset = node->tn_size; 649 650 if (uio->uio_offset + uio->uio_resid > 651 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 652 return (EFBIG); 653 654 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 655 return (EFBIG); 656 657 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 658 if (extended) { 659 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 660 FALSE); 661 if (error != 0) 662 goto out; 663 } 664 665 uobj = node->tn_reg.tn_aobj; 666 while ((resid = uio->uio_resid) > 0) { 667 if (node->tn_size <= uio->uio_offset) 668 break; 669 len = MIN(node->tn_size - uio->uio_offset, resid); 670 if (len == 0) 671 break; 672 error = tmpfs_mappedwrite(uobj, len, uio); 673 if ((error != 0) || (resid == uio->uio_resid)) 674 break; 675 } 676 677 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 678 (extended ? TMPFS_NODE_CHANGED : 0); 679 680 if (node->tn_mode & (S_ISUID | S_ISGID)) { 681 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 682 node->tn_mode &= ~(S_ISUID | S_ISGID); 683 } 684 685 if (error != 0) 686 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 687 688out: 689 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 690 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 691 692 return error; 693} 694 695/* --------------------------------------------------------------------- */ 696 697static int 698tmpfs_fsync(struct vop_fsync_args *v) 699{ 700 struct vnode *vp = v->a_vp; 701 702 MPASS(VOP_ISLOCKED(vp)); 703 704 tmpfs_update(vp); 705 706 return 0; 707} 708 709/* --------------------------------------------------------------------- */ 710 711static int 712tmpfs_remove(struct vop_remove_args *v) 713{ 714 struct vnode *dvp = v->a_dvp; 715 struct vnode *vp = v->a_vp; 716 717 int error; 718 struct tmpfs_dirent *de; 719 struct tmpfs_mount *tmp; 720 struct tmpfs_node *dnode; 721 struct tmpfs_node *node; 722 723 MPASS(VOP_ISLOCKED(dvp)); 724 MPASS(VOP_ISLOCKED(vp)); 725 726 if (vp->v_type == VDIR) { 727 error = EISDIR; 728 goto out; 729 } 730 731 dnode = VP_TO_TMPFS_DIR(dvp); 732 node = VP_TO_TMPFS_NODE(vp); 733 tmp = VFS_TO_TMPFS(vp->v_mount); 734 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 735 MPASS(de != NULL); 736 737 /* Files marked as immutable or append-only cannot be deleted. */ 738 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 739 (dnode->tn_flags & APPEND)) { 740 error = EPERM; 741 goto out; 742 } 743 744 /* Remove the entry from the directory; as it is a file, we do not 745 * have to change the number of hard links of the directory. */ 746 tmpfs_dir_detach(dvp, de); 747 if (v->a_cnp->cn_flags & DOWHITEOUT) 748 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 749 750 /* Free the directory entry we just deleted. Note that the node 751 * referred by it will not be removed until the vnode is really 752 * reclaimed. */ 753 tmpfs_free_dirent(tmp, de); 754 755 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 756 error = 0; 757 758out: 759 760 return error; 761} 762 763/* --------------------------------------------------------------------- */ 764 765static int 766tmpfs_link(struct vop_link_args *v) 767{ 768 struct vnode *dvp = v->a_tdvp; 769 struct vnode *vp = v->a_vp; 770 struct componentname *cnp = v->a_cnp; 771 772 int error; 773 struct tmpfs_dirent *de; 774 struct tmpfs_node *node; 775 776 MPASS(VOP_ISLOCKED(dvp)); 777 MPASS(cnp->cn_flags & HASBUF); 778 MPASS(dvp != vp); /* XXX When can this be false? */ 779 780 node = VP_TO_TMPFS_NODE(vp); 781 782 /* XXX: Why aren't the following two tests done by the caller? */ 783 784 /* Hard links of directories are forbidden. */ 785 if (vp->v_type == VDIR) { 786 error = EPERM; 787 goto out; 788 } 789 790 /* Cannot create cross-device links. */ 791 if (dvp->v_mount != vp->v_mount) { 792 error = EXDEV; 793 goto out; 794 } 795 796 /* Ensure that we do not overflow the maximum number of links imposed 797 * by the system. */ 798 MPASS(node->tn_links <= LINK_MAX); 799 if (node->tn_links == LINK_MAX) { 800 error = EMLINK; 801 goto out; 802 } 803 804 /* We cannot create links of files marked immutable or append-only. */ 805 if (node->tn_flags & (IMMUTABLE | APPEND)) { 806 error = EPERM; 807 goto out; 808 } 809 810 /* Allocate a new directory entry to represent the node. */ 811 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 812 cnp->cn_nameptr, cnp->cn_namelen, &de); 813 if (error != 0) 814 goto out; 815 816 /* Insert the new directory entry into the appropriate directory. */ 817 if (cnp->cn_flags & ISWHITEOUT) 818 tmpfs_dir_whiteout_remove(dvp, cnp); 819 tmpfs_dir_attach(dvp, de); 820 821 /* vp link count has changed, so update node times. */ 822 node->tn_status |= TMPFS_NODE_CHANGED; 823 tmpfs_update(vp); 824 825 error = 0; 826 827out: 828 return error; 829} 830 831/* --------------------------------------------------------------------- */ 832 833/* 834 * We acquire all but fdvp locks using non-blocking acquisitions. If we 835 * fail to acquire any lock in the path we will drop all held locks, 836 * acquire the new lock in a blocking fashion, and then release it and 837 * restart the rename. This acquire/release step ensures that we do not 838 * spin on a lock waiting for release. On error release all vnode locks 839 * and decrement references the way tmpfs_rename() would do. 840 */ 841static int 842tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 843 struct vnode *tdvp, struct vnode **tvpp, 844 struct componentname *fcnp, struct componentname *tcnp) 845{ 846 struct vnode *nvp; 847 struct mount *mp; 848 struct tmpfs_dirent *de; 849 int error, restarts = 0; 850 851 VOP_UNLOCK(tdvp, 0); 852 if (*tvpp != NULL && *tvpp != tdvp) 853 VOP_UNLOCK(*tvpp, 0); 854 mp = fdvp->v_mount; 855 856relock: 857 restarts += 1; 858 error = vn_lock(fdvp, LK_EXCLUSIVE); 859 if (error) 860 goto releout; 861 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 862 VOP_UNLOCK(fdvp, 0); 863 error = vn_lock(tdvp, LK_EXCLUSIVE); 864 if (error) 865 goto releout; 866 VOP_UNLOCK(tdvp, 0); 867 goto relock; 868 } 869 /* 870 * Re-resolve fvp to be certain it still exists and fetch the 871 * correct vnode. 872 */ 873 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 874 if (de == NULL) { 875 VOP_UNLOCK(fdvp, 0); 876 VOP_UNLOCK(tdvp, 0); 877 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 878 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 879 error = EINVAL; 880 else 881 error = ENOENT; 882 goto releout; 883 } 884 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 885 if (error != 0) { 886 VOP_UNLOCK(fdvp, 0); 887 VOP_UNLOCK(tdvp, 0); 888 if (error != EBUSY) 889 goto releout; 890 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 891 if (error != 0) 892 goto releout; 893 VOP_UNLOCK(nvp, 0); 894 /* 895 * Concurrent rename race. 896 */ 897 if (nvp == tdvp) { 898 vrele(nvp); 899 error = EINVAL; 900 goto releout; 901 } 902 vrele(*fvpp); 903 *fvpp = nvp; 904 goto relock; 905 } 906 vrele(*fvpp); 907 *fvpp = nvp; 908 VOP_UNLOCK(*fvpp, 0); 909 /* 910 * Re-resolve tvp and acquire the vnode lock if present. 911 */ 912 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 913 /* 914 * If tvp disappeared we just carry on. 915 */ 916 if (de == NULL && *tvpp != NULL) { 917 vrele(*tvpp); 918 *tvpp = NULL; 919 } 920 /* 921 * Get the tvp ino if the lookup succeeded. We may have to restart 922 * if the non-blocking acquire fails. 923 */ 924 if (de != NULL) { 925 nvp = NULL; 926 error = tmpfs_alloc_vp(mp, de->td_node, 927 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 928 if (*tvpp != NULL) 929 vrele(*tvpp); 930 *tvpp = nvp; 931 if (error != 0) { 932 VOP_UNLOCK(fdvp, 0); 933 VOP_UNLOCK(tdvp, 0); 934 if (error != EBUSY) 935 goto releout; 936 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 937 &nvp); 938 if (error != 0) 939 goto releout; 940 VOP_UNLOCK(nvp, 0); 941 /* 942 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 943 */ 944 if (nvp == fdvp) { 945 error = ENOTEMPTY; 946 goto releout; 947 } 948 goto relock; 949 } 950 } 951 tmpfs_rename_restarts += restarts; 952 953 return (0); 954 955releout: 956 vrele(fdvp); 957 vrele(*fvpp); 958 vrele(tdvp); 959 if (*tvpp != NULL) 960 vrele(*tvpp); 961 tmpfs_rename_restarts += restarts; 962 963 return (error); 964} 965 966static int 967tmpfs_rename(struct vop_rename_args *v) 968{ 969 struct vnode *fdvp = v->a_fdvp; 970 struct vnode *fvp = v->a_fvp; 971 struct componentname *fcnp = v->a_fcnp; 972 struct vnode *tdvp = v->a_tdvp; 973 struct vnode *tvp = v->a_tvp; 974 struct componentname *tcnp = v->a_tcnp; 975 struct mount *mp = NULL; 976 977 char *newname; 978 int error; 979 struct tmpfs_dirent *de; 980 struct tmpfs_mount *tmp; 981 struct tmpfs_node *fdnode; 982 struct tmpfs_node *fnode; 983 struct tmpfs_node *tnode; 984 struct tmpfs_node *tdnode; 985 986 MPASS(VOP_ISLOCKED(tdvp)); 987 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 988 MPASS(fcnp->cn_flags & HASBUF); 989 MPASS(tcnp->cn_flags & HASBUF); 990 991 /* Disallow cross-device renames. 992 * XXX Why isn't this done by the caller? */ 993 if (fvp->v_mount != tdvp->v_mount || 994 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 995 error = EXDEV; 996 goto out; 997 } 998 999 /* If source and target are the same file, there is nothing to do. */ 1000 if (fvp == tvp) { 1001 error = 0; 1002 goto out; 1003 } 1004 1005 /* If we need to move the directory between entries, lock the 1006 * source so that we can safely operate on it. */ 1007 if (fdvp != tdvp && fdvp != tvp) { 1008 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1009 mp = tdvp->v_mount; 1010 error = vfs_busy(mp, 0); 1011 if (error != 0) { 1012 mp = NULL; 1013 goto out; 1014 } 1015 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1016 fcnp, tcnp); 1017 if (error != 0) { 1018 vfs_unbusy(mp); 1019 return (error); 1020 } 1021 ASSERT_VOP_ELOCKED(fdvp, 1022 "tmpfs_rename: fdvp not locked"); 1023 ASSERT_VOP_ELOCKED(tdvp, 1024 "tmpfs_rename: tdvp not locked"); 1025 if (tvp != NULL) 1026 ASSERT_VOP_ELOCKED(tvp, 1027 "tmpfs_rename: tvp not locked"); 1028 if (fvp == tvp) { 1029 error = 0; 1030 goto out_locked; 1031 } 1032 } 1033 } 1034 1035 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1036 tdnode = VP_TO_TMPFS_DIR(tdvp); 1037 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1038 fdnode = VP_TO_TMPFS_DIR(fdvp); 1039 fnode = VP_TO_TMPFS_NODE(fvp); 1040 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1041 1042 /* Entry can disappear before we lock fdvp, 1043 * also avoid manipulating '.' and '..' entries. */ 1044 if (de == NULL) { 1045 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1046 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1047 error = EINVAL; 1048 else 1049 error = ENOENT; 1050 goto out_locked; 1051 } 1052 MPASS(de->td_node == fnode); 1053 1054 /* If re-naming a directory to another preexisting directory 1055 * ensure that the target directory is empty so that its 1056 * removal causes no side effects. 1057 * Kern_rename gurantees the destination to be a directory 1058 * if the source is one. */ 1059 if (tvp != NULL) { 1060 MPASS(tnode != NULL); 1061 1062 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1063 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1064 error = EPERM; 1065 goto out_locked; 1066 } 1067 1068 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1069 if (tnode->tn_size > 0) { 1070 error = ENOTEMPTY; 1071 goto out_locked; 1072 } 1073 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1074 error = ENOTDIR; 1075 goto out_locked; 1076 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1077 error = EISDIR; 1078 goto out_locked; 1079 } else { 1080 MPASS(fnode->tn_type != VDIR && 1081 tnode->tn_type != VDIR); 1082 } 1083 } 1084 1085 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1086 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1087 error = EPERM; 1088 goto out_locked; 1089 } 1090 1091 /* Ensure that we have enough memory to hold the new name, if it 1092 * has to be changed. */ 1093 if (fcnp->cn_namelen != tcnp->cn_namelen || 1094 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1095 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1096 } else 1097 newname = NULL; 1098 1099 /* If the node is being moved to another directory, we have to do 1100 * the move. */ 1101 if (fdnode != tdnode) { 1102 /* In case we are moving a directory, we have to adjust its 1103 * parent to point to the new parent. */ 1104 if (de->td_node->tn_type == VDIR) { 1105 struct tmpfs_node *n; 1106 1107 /* Ensure the target directory is not a child of the 1108 * directory being moved. Otherwise, we'd end up 1109 * with stale nodes. */ 1110 n = tdnode; 1111 /* TMPFS_LOCK garanties that no nodes are freed while 1112 * traversing the list. Nodes can only be marked as 1113 * removed: tn_parent == NULL. */ 1114 TMPFS_LOCK(tmp); 1115 TMPFS_NODE_LOCK(n); 1116 while (n != n->tn_dir.tn_parent) { 1117 struct tmpfs_node *parent; 1118 1119 if (n == fnode) { 1120 TMPFS_NODE_UNLOCK(n); 1121 TMPFS_UNLOCK(tmp); 1122 error = EINVAL; 1123 if (newname != NULL) 1124 free(newname, M_TMPFSNAME); 1125 goto out_locked; 1126 } 1127 parent = n->tn_dir.tn_parent; 1128 TMPFS_NODE_UNLOCK(n); 1129 if (parent == NULL) { 1130 n = NULL; 1131 break; 1132 } 1133 TMPFS_NODE_LOCK(parent); 1134 if (parent->tn_dir.tn_parent == NULL) { 1135 TMPFS_NODE_UNLOCK(parent); 1136 n = NULL; 1137 break; 1138 } 1139 n = parent; 1140 } 1141 TMPFS_UNLOCK(tmp); 1142 if (n == NULL) { 1143 error = EINVAL; 1144 if (newname != NULL) 1145 free(newname, M_TMPFSNAME); 1146 goto out_locked; 1147 } 1148 TMPFS_NODE_UNLOCK(n); 1149 1150 /* Adjust the parent pointer. */ 1151 TMPFS_VALIDATE_DIR(fnode); 1152 TMPFS_NODE_LOCK(de->td_node); 1153 de->td_node->tn_dir.tn_parent = tdnode; 1154 TMPFS_NODE_UNLOCK(de->td_node); 1155 1156 /* As a result of changing the target of the '..' 1157 * entry, the link count of the source and target 1158 * directories has to be adjusted. */ 1159 TMPFS_NODE_LOCK(tdnode); 1160 TMPFS_ASSERT_LOCKED(tdnode); 1161 tdnode->tn_links++; 1162 TMPFS_NODE_UNLOCK(tdnode); 1163 1164 TMPFS_NODE_LOCK(fdnode); 1165 TMPFS_ASSERT_LOCKED(fdnode); 1166 fdnode->tn_links--; 1167 TMPFS_NODE_UNLOCK(fdnode); 1168 } 1169 } 1170 1171 /* Do the move: just remove the entry from the source directory 1172 * and insert it into the target one. */ 1173 tmpfs_dir_detach(fdvp, de); 1174 1175 if (fcnp->cn_flags & DOWHITEOUT) 1176 tmpfs_dir_whiteout_add(fdvp, fcnp); 1177 if (tcnp->cn_flags & ISWHITEOUT) 1178 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1179 1180 /* If the name has changed, we need to make it effective by changing 1181 * it in the directory entry. */ 1182 if (newname != NULL) { 1183 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1184 1185 free(de->ud.td_name, M_TMPFSNAME); 1186 de->ud.td_name = newname; 1187 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1188 1189 fnode->tn_status |= TMPFS_NODE_CHANGED; 1190 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1191 } 1192 1193 /* If we are overwriting an entry, we have to remove the old one 1194 * from the target directory. */ 1195 if (tvp != NULL) { 1196 struct tmpfs_dirent *tde; 1197 1198 /* Remove the old entry from the target directory. */ 1199 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1200 tmpfs_dir_detach(tdvp, tde); 1201 1202 /* Free the directory entry we just deleted. Note that the 1203 * node referred by it will not be removed until the vnode is 1204 * really reclaimed. */ 1205 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1206 } 1207 1208 tmpfs_dir_attach(tdvp, de); 1209 1210 cache_purge(fvp); 1211 if (tvp != NULL) 1212 cache_purge(tvp); 1213 cache_purge_negative(tdvp); 1214 1215 error = 0; 1216 1217out_locked: 1218 if (fdvp != tdvp && fdvp != tvp) 1219 VOP_UNLOCK(fdvp, 0); 1220 1221out: 1222 /* Release target nodes. */ 1223 /* XXX: I don't understand when tdvp can be the same as tvp, but 1224 * other code takes care of this... */ 1225 if (tdvp == tvp) 1226 vrele(tdvp); 1227 else 1228 vput(tdvp); 1229 if (tvp != NULL) 1230 vput(tvp); 1231 1232 /* Release source nodes. */ 1233 vrele(fdvp); 1234 vrele(fvp); 1235 1236 if (mp != NULL) 1237 vfs_unbusy(mp); 1238 1239 return error; 1240} 1241 1242/* --------------------------------------------------------------------- */ 1243 1244static int 1245tmpfs_mkdir(struct vop_mkdir_args *v) 1246{ 1247 struct vnode *dvp = v->a_dvp; 1248 struct vnode **vpp = v->a_vpp; 1249 struct componentname *cnp = v->a_cnp; 1250 struct vattr *vap = v->a_vap; 1251 1252 MPASS(vap->va_type == VDIR); 1253 1254 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1255} 1256 1257/* --------------------------------------------------------------------- */ 1258 1259static int 1260tmpfs_rmdir(struct vop_rmdir_args *v) 1261{ 1262 struct vnode *dvp = v->a_dvp; 1263 struct vnode *vp = v->a_vp; 1264 1265 int error; 1266 struct tmpfs_dirent *de; 1267 struct tmpfs_mount *tmp; 1268 struct tmpfs_node *dnode; 1269 struct tmpfs_node *node; 1270 1271 MPASS(VOP_ISLOCKED(dvp)); 1272 MPASS(VOP_ISLOCKED(vp)); 1273 1274 tmp = VFS_TO_TMPFS(dvp->v_mount); 1275 dnode = VP_TO_TMPFS_DIR(dvp); 1276 node = VP_TO_TMPFS_DIR(vp); 1277 1278 /* Directories with more than two entries ('.' and '..') cannot be 1279 * removed. */ 1280 if (node->tn_size > 0) { 1281 error = ENOTEMPTY; 1282 goto out; 1283 } 1284 1285 if ((dnode->tn_flags & APPEND) 1286 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1287 error = EPERM; 1288 goto out; 1289 } 1290 1291 /* This invariant holds only if we are not trying to remove "..". 1292 * We checked for that above so this is safe now. */ 1293 MPASS(node->tn_dir.tn_parent == dnode); 1294 1295 /* Get the directory entry associated with node (vp). This was 1296 * filled by tmpfs_lookup while looking up the entry. */ 1297 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1298 MPASS(TMPFS_DIRENT_MATCHES(de, 1299 v->a_cnp->cn_nameptr, 1300 v->a_cnp->cn_namelen)); 1301 1302 /* Check flags to see if we are allowed to remove the directory. */ 1303 if (dnode->tn_flags & APPEND 1304 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1305 error = EPERM; 1306 goto out; 1307 } 1308 1309 1310 /* Detach the directory entry from the directory (dnode). */ 1311 tmpfs_dir_detach(dvp, de); 1312 if (v->a_cnp->cn_flags & DOWHITEOUT) 1313 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1314 1315 /* No vnode should be allocated for this entry from this point */ 1316 TMPFS_NODE_LOCK(node); 1317 TMPFS_ASSERT_ELOCKED(node); 1318 node->tn_links--; 1319 node->tn_dir.tn_parent = NULL; 1320 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1321 TMPFS_NODE_MODIFIED; 1322 1323 TMPFS_NODE_UNLOCK(node); 1324 1325 TMPFS_NODE_LOCK(dnode); 1326 TMPFS_ASSERT_ELOCKED(dnode); 1327 dnode->tn_links--; 1328 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1329 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1330 TMPFS_NODE_UNLOCK(dnode); 1331 1332 cache_purge(dvp); 1333 cache_purge(vp); 1334 1335 /* Free the directory entry we just deleted. Note that the node 1336 * referred by it will not be removed until the vnode is really 1337 * reclaimed. */ 1338 tmpfs_free_dirent(tmp, de); 1339 1340 /* Release the deleted vnode (will destroy the node, notify 1341 * interested parties and clean it from the cache). */ 1342 1343 dnode->tn_status |= TMPFS_NODE_CHANGED; 1344 tmpfs_update(dvp); 1345 1346 error = 0; 1347 1348out: 1349 return error; 1350} 1351 1352/* --------------------------------------------------------------------- */ 1353 1354static int 1355tmpfs_symlink(struct vop_symlink_args *v) 1356{ 1357 struct vnode *dvp = v->a_dvp; 1358 struct vnode **vpp = v->a_vpp; 1359 struct componentname *cnp = v->a_cnp; 1360 struct vattr *vap = v->a_vap; 1361 char *target = v->a_target; 1362 1363#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1364 MPASS(vap->va_type == VLNK); 1365#else 1366 vap->va_type = VLNK; 1367#endif 1368 1369 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1370} 1371 1372/* --------------------------------------------------------------------- */ 1373 1374static int 1375tmpfs_readdir(struct vop_readdir_args *v) 1376{ 1377 struct vnode *vp = v->a_vp; 1378 struct uio *uio = v->a_uio; 1379 int *eofflag = v->a_eofflag; 1380 u_long **cookies = v->a_cookies; 1381 int *ncookies = v->a_ncookies; 1382 1383 int error; 1384 ssize_t startresid; 1385 int cnt = 0; 1386 struct tmpfs_node *node; 1387 1388 /* This operation only makes sense on directory nodes. */ 1389 if (vp->v_type != VDIR) 1390 return ENOTDIR; 1391 1392 node = VP_TO_TMPFS_DIR(vp); 1393 1394 startresid = uio->uio_resid; 1395 1396 if (cookies != NULL && ncookies != NULL) { 1397 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1398 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1399 *ncookies = 0; 1400 } 1401 1402 if (cnt == 0) 1403 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1404 else 1405 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1406 1407 if (error == EJUSTRETURN) 1408 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1409 1410 if (error != 0 && cnt != 0) 1411 free(*cookies, M_TEMP); 1412 1413 if (eofflag != NULL) 1414 *eofflag = 1415 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1416 1417 return error; 1418} 1419 1420/* --------------------------------------------------------------------- */ 1421 1422static int 1423tmpfs_readlink(struct vop_readlink_args *v) 1424{ 1425 struct vnode *vp = v->a_vp; 1426 struct uio *uio = v->a_uio; 1427 1428 int error; 1429 struct tmpfs_node *node; 1430 1431 MPASS(uio->uio_offset == 0); 1432 MPASS(vp->v_type == VLNK); 1433 1434 node = VP_TO_TMPFS_NODE(vp); 1435 1436 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1437 uio); 1438 node->tn_status |= TMPFS_NODE_ACCESSED; 1439 1440 return error; 1441} 1442 1443/* --------------------------------------------------------------------- */ 1444 1445static int 1446tmpfs_inactive(struct vop_inactive_args *v) 1447{ 1448 struct vnode *vp = v->a_vp; 1449 1450 struct tmpfs_node *node; 1451 1452 node = VP_TO_TMPFS_NODE(vp); 1453 1454 if (node->tn_links == 0) 1455 vrecycle(vp); 1456 1457 return 0; 1458} 1459 1460/* --------------------------------------------------------------------- */ 1461 1462int 1463tmpfs_reclaim(struct vop_reclaim_args *v) 1464{ 1465 struct vnode *vp = v->a_vp; 1466 1467 struct tmpfs_mount *tmp; 1468 struct tmpfs_node *node; 1469 vm_object_t obj; 1470 1471 node = VP_TO_TMPFS_NODE(vp); 1472 tmp = VFS_TO_TMPFS(vp->v_mount); 1473 1474 if (node->tn_type == VREG) { 1475 obj = node->tn_reg.tn_aobj; 1476 if (obj != NULL) { 1477 /* Instead of vnode_destroy_vobject() */ 1478 VM_OBJECT_WLOCK(obj); 1479 VI_LOCK(vp); 1480 vm_object_clear_flag(obj, OBJ_TMPFS); 1481 obj->un_pager.swp.swp_tmpfs = NULL; 1482 VI_UNLOCK(vp); 1483 VM_OBJECT_WUNLOCK(obj); 1484 } 1485 } 1486 vp->v_object = NULL; 1487 cache_purge(vp); 1488 1489 TMPFS_NODE_LOCK(node); 1490 TMPFS_ASSERT_ELOCKED(node); 1491 tmpfs_free_vp(vp); 1492 1493 /* If the node referenced by this vnode was deleted by the user, 1494 * we must free its associated data structures (now that the vnode 1495 * is being reclaimed). */ 1496 if (node->tn_links == 0 && 1497 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1498 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1499 TMPFS_NODE_UNLOCK(node); 1500 tmpfs_free_node(tmp, node); 1501 } else 1502 TMPFS_NODE_UNLOCK(node); 1503 1504 MPASS(vp->v_data == NULL); 1505 return 0; 1506} 1507 1508/* --------------------------------------------------------------------- */ 1509 1510static int 1511tmpfs_print(struct vop_print_args *v) 1512{ 1513 struct vnode *vp = v->a_vp; 1514 1515 struct tmpfs_node *node; 1516 1517 node = VP_TO_TMPFS_NODE(vp); 1518 1519 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1520 node, node->tn_flags, node->tn_links); 1521 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1522 node->tn_mode, node->tn_uid, node->tn_gid, 1523 (intmax_t)node->tn_size, node->tn_status); 1524 1525 if (vp->v_type == VFIFO) 1526 fifo_printinfo(vp); 1527 1528 printf("\n"); 1529 1530 return 0; 1531} 1532 1533/* --------------------------------------------------------------------- */ 1534 1535static int 1536tmpfs_pathconf(struct vop_pathconf_args *v) 1537{ 1538 int name = v->a_name; 1539 register_t *retval = v->a_retval; 1540 1541 int error; 1542 1543 error = 0; 1544 1545 switch (name) { 1546 case _PC_LINK_MAX: 1547 *retval = LINK_MAX; 1548 break; 1549 1550 case _PC_NAME_MAX: 1551 *retval = NAME_MAX; 1552 break; 1553 1554 case _PC_PATH_MAX: 1555 *retval = PATH_MAX; 1556 break; 1557 1558 case _PC_PIPE_BUF: 1559 *retval = PIPE_BUF; 1560 break; 1561 1562 case _PC_CHOWN_RESTRICTED: 1563 *retval = 1; 1564 break; 1565 1566 case _PC_NO_TRUNC: 1567 *retval = 1; 1568 break; 1569 1570 case _PC_SYNC_IO: 1571 *retval = 1; 1572 break; 1573 1574 case _PC_FILESIZEBITS: 1575 *retval = 0; /* XXX Don't know which value should I return. */ 1576 break; 1577 1578 default: 1579 error = EINVAL; 1580 } 1581 1582 return error; 1583} 1584 1585static int 1586tmpfs_vptofh(struct vop_vptofh_args *ap) 1587{ 1588 struct tmpfs_fid *tfhp; 1589 struct tmpfs_node *node; 1590 1591 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1592 node = VP_TO_TMPFS_NODE(ap->a_vp); 1593 1594 tfhp->tf_len = sizeof(struct tmpfs_fid); 1595 tfhp->tf_id = node->tn_id; 1596 tfhp->tf_gen = node->tn_gen; 1597 1598 return (0); 1599} 1600 1601static int 1602tmpfs_whiteout(struct vop_whiteout_args *ap) 1603{ 1604 struct vnode *dvp = ap->a_dvp; 1605 struct componentname *cnp = ap->a_cnp; 1606 struct tmpfs_dirent *de; 1607 1608 switch (ap->a_flags) { 1609 case LOOKUP: 1610 return (0); 1611 case CREATE: 1612 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1613 if (de != NULL) 1614 return (de->td_node == NULL ? 0 : EEXIST); 1615 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1616 case DELETE: 1617 tmpfs_dir_whiteout_remove(dvp, cnp); 1618 return (0); 1619 default: 1620 panic("tmpfs_whiteout: unknown op"); 1621 } 1622} 1623 1624/* --------------------------------------------------------------------- */ 1625 1626/* 1627 * vnode operations vector used for files stored in a tmpfs file system. 1628 */ 1629struct vop_vector tmpfs_vnodeop_entries = { 1630 .vop_default = &default_vnodeops, 1631 .vop_lookup = vfs_cache_lookup, 1632 .vop_cachedlookup = tmpfs_lookup, 1633 .vop_create = tmpfs_create, 1634 .vop_mknod = tmpfs_mknod, 1635 .vop_open = tmpfs_open, 1636 .vop_close = tmpfs_close, 1637 .vop_access = tmpfs_access, 1638 .vop_getattr = tmpfs_getattr, 1639 .vop_setattr = tmpfs_setattr, 1640 .vop_read = tmpfs_read, 1641 .vop_write = tmpfs_write, 1642 .vop_fsync = tmpfs_fsync, 1643 .vop_remove = tmpfs_remove, 1644 .vop_link = tmpfs_link, 1645 .vop_rename = tmpfs_rename, 1646 .vop_mkdir = tmpfs_mkdir, 1647 .vop_rmdir = tmpfs_rmdir, 1648 .vop_symlink = tmpfs_symlink, 1649 .vop_readdir = tmpfs_readdir, 1650 .vop_readlink = tmpfs_readlink, 1651 .vop_inactive = tmpfs_inactive, 1652 .vop_reclaim = tmpfs_reclaim, 1653 .vop_print = tmpfs_print, 1654 .vop_pathconf = tmpfs_pathconf, 1655 .vop_vptofh = tmpfs_vptofh, 1656 .vop_whiteout = tmpfs_whiteout, 1657 .vop_bmap = VOP_EOPNOTSUPP, 1658}; 1659 1660