tmpfs_vnops.c revision 250189
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 250189 2013-05-02 18:44:31Z 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 if (m->queue != PQ_NONE) 498 vm_page_requeue(m); 499 vm_page_unlock(m); 500 VM_OBJECT_WUNLOCK(tobj); 501 502 return (error); 503} 504 505static int 506tmpfs_read(struct vop_read_args *v) 507{ 508 struct vnode *vp = v->a_vp; 509 struct uio *uio = v->a_uio; 510 struct tmpfs_node *node; 511 vm_object_t uobj; 512 size_t len; 513 int resid; 514 int error = 0; 515 vm_pindex_t idx; 516 vm_offset_t offset; 517 off_t addr; 518 size_t tlen; 519 520 node = VP_TO_TMPFS_NODE(vp); 521 522 if (vp->v_type != VREG) { 523 error = EISDIR; 524 goto out; 525 } 526 527 if (uio->uio_offset < 0) { 528 error = EINVAL; 529 goto out; 530 } 531 532 node->tn_status |= TMPFS_NODE_ACCESSED; 533 534 uobj = node->tn_reg.tn_aobj; 535 while ((resid = uio->uio_resid) > 0) { 536 error = 0; 537 if (node->tn_size <= uio->uio_offset) 538 break; 539 len = MIN(node->tn_size - uio->uio_offset, resid); 540 if (len == 0) 541 break; 542 addr = uio->uio_offset; 543 idx = OFF_TO_IDX(addr); 544 offset = addr & PAGE_MASK; 545 tlen = MIN(PAGE_SIZE - offset, len); 546 error = tmpfs_nocacheread(uobj, idx, offset, tlen, uio); 547 if ((error != 0) || (resid == uio->uio_resid)) 548 break; 549 } 550 551out: 552 553 return error; 554} 555 556/* --------------------------------------------------------------------- */ 557 558static int 559tmpfs_mappedwrite(vm_object_t tobj, size_t len, struct uio *uio) 560{ 561 vm_pindex_t idx; 562 vm_page_t tpg; 563 vm_offset_t offset; 564 off_t addr; 565 size_t tlen; 566 int error, rv; 567 568 error = 0; 569 570 addr = uio->uio_offset; 571 idx = OFF_TO_IDX(addr); 572 offset = addr & PAGE_MASK; 573 tlen = MIN(PAGE_SIZE - offset, len); 574 575 VM_OBJECT_WLOCK(tobj); 576 tpg = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 577 if (tpg->valid != VM_PAGE_BITS_ALL) { 578 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 579 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 580 tpg = vm_page_lookup(tobj, idx); 581 if (tpg == NULL) { 582 printf( 583 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 584 tobj, idx, rv); 585 return (EIO); 586 } 587 if (rv != VM_PAGER_OK) { 588 printf( 589 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 590 tobj, idx, tpg->valid, rv); 591 vm_page_lock(tpg); 592 vm_page_free(tpg); 593 vm_page_unlock(tpg); 594 VM_OBJECT_WUNLOCK(tobj); 595 return (EIO); 596 } 597 } else 598 vm_page_zero_invalid(tpg, TRUE); 599 } 600 vm_page_lock(tpg); 601 vm_page_hold(tpg); 602 vm_page_wakeup(tpg); 603 vm_page_unlock(tpg); 604 VM_OBJECT_WUNLOCK(tobj); 605 error = uiomove_fromphys(&tpg, offset, tlen, uio); 606 VM_OBJECT_WLOCK(tobj); 607 if (error == 0) 608 vm_page_dirty(tpg); 609 vm_page_lock(tpg); 610 vm_page_unhold(tpg); 611 vm_page_deactivate(tpg); 612 /* Requeue to maintain LRU ordering. */ 613 if (tpg->queue != PQ_NONE) 614 vm_page_requeue(tpg); 615 vm_page_unlock(tpg); 616 VM_OBJECT_WUNLOCK(tobj); 617 618 return (error); 619} 620 621static int 622tmpfs_write(struct vop_write_args *v) 623{ 624 struct vnode *vp = v->a_vp; 625 struct uio *uio = v->a_uio; 626 int ioflag = v->a_ioflag; 627 628 boolean_t extended; 629 int error = 0; 630 off_t oldsize; 631 struct tmpfs_node *node; 632 vm_object_t uobj; 633 size_t len; 634 int resid; 635 636 node = VP_TO_TMPFS_NODE(vp); 637 oldsize = node->tn_size; 638 639 if (uio->uio_offset < 0 || vp->v_type != VREG) { 640 error = EINVAL; 641 goto out; 642 } 643 644 if (uio->uio_resid == 0) { 645 error = 0; 646 goto out; 647 } 648 649 if (ioflag & IO_APPEND) 650 uio->uio_offset = node->tn_size; 651 652 if (uio->uio_offset + uio->uio_resid > 653 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 654 return (EFBIG); 655 656 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 657 return (EFBIG); 658 659 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 660 if (extended) { 661 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 662 FALSE); 663 if (error != 0) 664 goto out; 665 } 666 667 uobj = node->tn_reg.tn_aobj; 668 while ((resid = uio->uio_resid) > 0) { 669 if (node->tn_size <= uio->uio_offset) 670 break; 671 len = MIN(node->tn_size - uio->uio_offset, resid); 672 if (len == 0) 673 break; 674 error = tmpfs_mappedwrite(uobj, len, uio); 675 if ((error != 0) || (resid == uio->uio_resid)) 676 break; 677 } 678 679 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 680 (extended ? TMPFS_NODE_CHANGED : 0); 681 682 if (node->tn_mode & (S_ISUID | S_ISGID)) { 683 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 684 node->tn_mode &= ~(S_ISUID | S_ISGID); 685 } 686 687 if (error != 0) 688 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 689 690out: 691 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 692 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 693 694 return error; 695} 696 697/* --------------------------------------------------------------------- */ 698 699static int 700tmpfs_fsync(struct vop_fsync_args *v) 701{ 702 struct vnode *vp = v->a_vp; 703 704 MPASS(VOP_ISLOCKED(vp)); 705 706 tmpfs_update(vp); 707 708 return 0; 709} 710 711/* --------------------------------------------------------------------- */ 712 713static int 714tmpfs_remove(struct vop_remove_args *v) 715{ 716 struct vnode *dvp = v->a_dvp; 717 struct vnode *vp = v->a_vp; 718 719 int error; 720 struct tmpfs_dirent *de; 721 struct tmpfs_mount *tmp; 722 struct tmpfs_node *dnode; 723 struct tmpfs_node *node; 724 725 MPASS(VOP_ISLOCKED(dvp)); 726 MPASS(VOP_ISLOCKED(vp)); 727 728 if (vp->v_type == VDIR) { 729 error = EISDIR; 730 goto out; 731 } 732 733 dnode = VP_TO_TMPFS_DIR(dvp); 734 node = VP_TO_TMPFS_NODE(vp); 735 tmp = VFS_TO_TMPFS(vp->v_mount); 736 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 737 MPASS(de != NULL); 738 739 /* Files marked as immutable or append-only cannot be deleted. */ 740 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 741 (dnode->tn_flags & APPEND)) { 742 error = EPERM; 743 goto out; 744 } 745 746 /* Remove the entry from the directory; as it is a file, we do not 747 * have to change the number of hard links of the directory. */ 748 tmpfs_dir_detach(dvp, de); 749 if (v->a_cnp->cn_flags & DOWHITEOUT) 750 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 751 752 /* Free the directory entry we just deleted. Note that the node 753 * referred by it will not be removed until the vnode is really 754 * reclaimed. */ 755 tmpfs_free_dirent(tmp, de); 756 757 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 758 error = 0; 759 760out: 761 762 return error; 763} 764 765/* --------------------------------------------------------------------- */ 766 767static int 768tmpfs_link(struct vop_link_args *v) 769{ 770 struct vnode *dvp = v->a_tdvp; 771 struct vnode *vp = v->a_vp; 772 struct componentname *cnp = v->a_cnp; 773 774 int error; 775 struct tmpfs_dirent *de; 776 struct tmpfs_node *node; 777 778 MPASS(VOP_ISLOCKED(dvp)); 779 MPASS(cnp->cn_flags & HASBUF); 780 MPASS(dvp != vp); /* XXX When can this be false? */ 781 782 node = VP_TO_TMPFS_NODE(vp); 783 784 /* XXX: Why aren't the following two tests done by the caller? */ 785 786 /* Hard links of directories are forbidden. */ 787 if (vp->v_type == VDIR) { 788 error = EPERM; 789 goto out; 790 } 791 792 /* Cannot create cross-device links. */ 793 if (dvp->v_mount != vp->v_mount) { 794 error = EXDEV; 795 goto out; 796 } 797 798 /* Ensure that we do not overflow the maximum number of links imposed 799 * by the system. */ 800 MPASS(node->tn_links <= LINK_MAX); 801 if (node->tn_links == LINK_MAX) { 802 error = EMLINK; 803 goto out; 804 } 805 806 /* We cannot create links of files marked immutable or append-only. */ 807 if (node->tn_flags & (IMMUTABLE | APPEND)) { 808 error = EPERM; 809 goto out; 810 } 811 812 /* Allocate a new directory entry to represent the node. */ 813 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 814 cnp->cn_nameptr, cnp->cn_namelen, &de); 815 if (error != 0) 816 goto out; 817 818 /* Insert the new directory entry into the appropriate directory. */ 819 if (cnp->cn_flags & ISWHITEOUT) 820 tmpfs_dir_whiteout_remove(dvp, cnp); 821 tmpfs_dir_attach(dvp, de); 822 823 /* vp link count has changed, so update node times. */ 824 node->tn_status |= TMPFS_NODE_CHANGED; 825 tmpfs_update(vp); 826 827 error = 0; 828 829out: 830 return error; 831} 832 833/* --------------------------------------------------------------------- */ 834 835/* 836 * We acquire all but fdvp locks using non-blocking acquisitions. If we 837 * fail to acquire any lock in the path we will drop all held locks, 838 * acquire the new lock in a blocking fashion, and then release it and 839 * restart the rename. This acquire/release step ensures that we do not 840 * spin on a lock waiting for release. On error release all vnode locks 841 * and decrement references the way tmpfs_rename() would do. 842 */ 843static int 844tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 845 struct vnode *tdvp, struct vnode **tvpp, 846 struct componentname *fcnp, struct componentname *tcnp) 847{ 848 struct vnode *nvp; 849 struct mount *mp; 850 struct tmpfs_dirent *de; 851 int error, restarts = 0; 852 853 VOP_UNLOCK(tdvp, 0); 854 if (*tvpp != NULL && *tvpp != tdvp) 855 VOP_UNLOCK(*tvpp, 0); 856 mp = fdvp->v_mount; 857 858relock: 859 restarts += 1; 860 error = vn_lock(fdvp, LK_EXCLUSIVE); 861 if (error) 862 goto releout; 863 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 864 VOP_UNLOCK(fdvp, 0); 865 error = vn_lock(tdvp, LK_EXCLUSIVE); 866 if (error) 867 goto releout; 868 VOP_UNLOCK(tdvp, 0); 869 goto relock; 870 } 871 /* 872 * Re-resolve fvp to be certain it still exists and fetch the 873 * correct vnode. 874 */ 875 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 876 if (de == NULL) { 877 VOP_UNLOCK(fdvp, 0); 878 VOP_UNLOCK(tdvp, 0); 879 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 880 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 881 error = EINVAL; 882 else 883 error = ENOENT; 884 goto releout; 885 } 886 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 887 if (error != 0) { 888 VOP_UNLOCK(fdvp, 0); 889 VOP_UNLOCK(tdvp, 0); 890 if (error != EBUSY) 891 goto releout; 892 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 893 if (error != 0) 894 goto releout; 895 VOP_UNLOCK(nvp, 0); 896 /* 897 * Concurrent rename race. 898 */ 899 if (nvp == tdvp) { 900 vrele(nvp); 901 error = EINVAL; 902 goto releout; 903 } 904 vrele(*fvpp); 905 *fvpp = nvp; 906 goto relock; 907 } 908 vrele(*fvpp); 909 *fvpp = nvp; 910 VOP_UNLOCK(*fvpp, 0); 911 /* 912 * Re-resolve tvp and acquire the vnode lock if present. 913 */ 914 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 915 /* 916 * If tvp disappeared we just carry on. 917 */ 918 if (de == NULL && *tvpp != NULL) { 919 vrele(*tvpp); 920 *tvpp = NULL; 921 } 922 /* 923 * Get the tvp ino if the lookup succeeded. We may have to restart 924 * if the non-blocking acquire fails. 925 */ 926 if (de != NULL) { 927 nvp = NULL; 928 error = tmpfs_alloc_vp(mp, de->td_node, 929 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 930 if (*tvpp != NULL) 931 vrele(*tvpp); 932 *tvpp = nvp; 933 if (error != 0) { 934 VOP_UNLOCK(fdvp, 0); 935 VOP_UNLOCK(tdvp, 0); 936 if (error != EBUSY) 937 goto releout; 938 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 939 &nvp); 940 if (error != 0) 941 goto releout; 942 VOP_UNLOCK(nvp, 0); 943 /* 944 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 945 */ 946 if (nvp == fdvp) { 947 error = ENOTEMPTY; 948 goto releout; 949 } 950 goto relock; 951 } 952 } 953 tmpfs_rename_restarts += restarts; 954 955 return (0); 956 957releout: 958 vrele(fdvp); 959 vrele(*fvpp); 960 vrele(tdvp); 961 if (*tvpp != NULL) 962 vrele(*tvpp); 963 tmpfs_rename_restarts += restarts; 964 965 return (error); 966} 967 968static int 969tmpfs_rename(struct vop_rename_args *v) 970{ 971 struct vnode *fdvp = v->a_fdvp; 972 struct vnode *fvp = v->a_fvp; 973 struct componentname *fcnp = v->a_fcnp; 974 struct vnode *tdvp = v->a_tdvp; 975 struct vnode *tvp = v->a_tvp; 976 struct componentname *tcnp = v->a_tcnp; 977 struct mount *mp = NULL; 978 979 char *newname; 980 int error; 981 struct tmpfs_dirent *de; 982 struct tmpfs_mount *tmp; 983 struct tmpfs_node *fdnode; 984 struct tmpfs_node *fnode; 985 struct tmpfs_node *tnode; 986 struct tmpfs_node *tdnode; 987 988 MPASS(VOP_ISLOCKED(tdvp)); 989 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 990 MPASS(fcnp->cn_flags & HASBUF); 991 MPASS(tcnp->cn_flags & HASBUF); 992 993 /* Disallow cross-device renames. 994 * XXX Why isn't this done by the caller? */ 995 if (fvp->v_mount != tdvp->v_mount || 996 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 997 error = EXDEV; 998 goto out; 999 } 1000 1001 /* If source and target are the same file, there is nothing to do. */ 1002 if (fvp == tvp) { 1003 error = 0; 1004 goto out; 1005 } 1006 1007 /* If we need to move the directory between entries, lock the 1008 * source so that we can safely operate on it. */ 1009 if (fdvp != tdvp && fdvp != tvp) { 1010 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1011 mp = tdvp->v_mount; 1012 error = vfs_busy(mp, 0); 1013 if (error != 0) { 1014 mp = NULL; 1015 goto out; 1016 } 1017 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1018 fcnp, tcnp); 1019 if (error != 0) { 1020 vfs_unbusy(mp); 1021 return (error); 1022 } 1023 ASSERT_VOP_ELOCKED(fdvp, 1024 "tmpfs_rename: fdvp not locked"); 1025 ASSERT_VOP_ELOCKED(tdvp, 1026 "tmpfs_rename: tdvp not locked"); 1027 if (tvp != NULL) 1028 ASSERT_VOP_ELOCKED(tvp, 1029 "tmpfs_rename: tvp not locked"); 1030 if (fvp == tvp) { 1031 error = 0; 1032 goto out_locked; 1033 } 1034 } 1035 } 1036 1037 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1038 tdnode = VP_TO_TMPFS_DIR(tdvp); 1039 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1040 fdnode = VP_TO_TMPFS_DIR(fdvp); 1041 fnode = VP_TO_TMPFS_NODE(fvp); 1042 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1043 1044 /* Entry can disappear before we lock fdvp, 1045 * also avoid manipulating '.' and '..' entries. */ 1046 if (de == NULL) { 1047 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1048 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1049 error = EINVAL; 1050 else 1051 error = ENOENT; 1052 goto out_locked; 1053 } 1054 MPASS(de->td_node == fnode); 1055 1056 /* If re-naming a directory to another preexisting directory 1057 * ensure that the target directory is empty so that its 1058 * removal causes no side effects. 1059 * Kern_rename gurantees the destination to be a directory 1060 * if the source is one. */ 1061 if (tvp != NULL) { 1062 MPASS(tnode != NULL); 1063 1064 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1065 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1066 error = EPERM; 1067 goto out_locked; 1068 } 1069 1070 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1071 if (tnode->tn_size > 0) { 1072 error = ENOTEMPTY; 1073 goto out_locked; 1074 } 1075 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1076 error = ENOTDIR; 1077 goto out_locked; 1078 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1079 error = EISDIR; 1080 goto out_locked; 1081 } else { 1082 MPASS(fnode->tn_type != VDIR && 1083 tnode->tn_type != VDIR); 1084 } 1085 } 1086 1087 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1088 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1089 error = EPERM; 1090 goto out_locked; 1091 } 1092 1093 /* Ensure that we have enough memory to hold the new name, if it 1094 * has to be changed. */ 1095 if (fcnp->cn_namelen != tcnp->cn_namelen || 1096 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1097 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1098 } else 1099 newname = NULL; 1100 1101 /* If the node is being moved to another directory, we have to do 1102 * the move. */ 1103 if (fdnode != tdnode) { 1104 /* In case we are moving a directory, we have to adjust its 1105 * parent to point to the new parent. */ 1106 if (de->td_node->tn_type == VDIR) { 1107 struct tmpfs_node *n; 1108 1109 /* Ensure the target directory is not a child of the 1110 * directory being moved. Otherwise, we'd end up 1111 * with stale nodes. */ 1112 n = tdnode; 1113 /* TMPFS_LOCK garanties that no nodes are freed while 1114 * traversing the list. Nodes can only be marked as 1115 * removed: tn_parent == NULL. */ 1116 TMPFS_LOCK(tmp); 1117 TMPFS_NODE_LOCK(n); 1118 while (n != n->tn_dir.tn_parent) { 1119 struct tmpfs_node *parent; 1120 1121 if (n == fnode) { 1122 TMPFS_NODE_UNLOCK(n); 1123 TMPFS_UNLOCK(tmp); 1124 error = EINVAL; 1125 if (newname != NULL) 1126 free(newname, M_TMPFSNAME); 1127 goto out_locked; 1128 } 1129 parent = n->tn_dir.tn_parent; 1130 TMPFS_NODE_UNLOCK(n); 1131 if (parent == NULL) { 1132 n = NULL; 1133 break; 1134 } 1135 TMPFS_NODE_LOCK(parent); 1136 if (parent->tn_dir.tn_parent == NULL) { 1137 TMPFS_NODE_UNLOCK(parent); 1138 n = NULL; 1139 break; 1140 } 1141 n = parent; 1142 } 1143 TMPFS_UNLOCK(tmp); 1144 if (n == NULL) { 1145 error = EINVAL; 1146 if (newname != NULL) 1147 free(newname, M_TMPFSNAME); 1148 goto out_locked; 1149 } 1150 TMPFS_NODE_UNLOCK(n); 1151 1152 /* Adjust the parent pointer. */ 1153 TMPFS_VALIDATE_DIR(fnode); 1154 TMPFS_NODE_LOCK(de->td_node); 1155 de->td_node->tn_dir.tn_parent = tdnode; 1156 TMPFS_NODE_UNLOCK(de->td_node); 1157 1158 /* As a result of changing the target of the '..' 1159 * entry, the link count of the source and target 1160 * directories has to be adjusted. */ 1161 TMPFS_NODE_LOCK(tdnode); 1162 TMPFS_ASSERT_LOCKED(tdnode); 1163 tdnode->tn_links++; 1164 TMPFS_NODE_UNLOCK(tdnode); 1165 1166 TMPFS_NODE_LOCK(fdnode); 1167 TMPFS_ASSERT_LOCKED(fdnode); 1168 fdnode->tn_links--; 1169 TMPFS_NODE_UNLOCK(fdnode); 1170 } 1171 } 1172 1173 /* Do the move: just remove the entry from the source directory 1174 * and insert it into the target one. */ 1175 tmpfs_dir_detach(fdvp, de); 1176 1177 if (fcnp->cn_flags & DOWHITEOUT) 1178 tmpfs_dir_whiteout_add(fdvp, fcnp); 1179 if (tcnp->cn_flags & ISWHITEOUT) 1180 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1181 1182 /* If the name has changed, we need to make it effective by changing 1183 * it in the directory entry. */ 1184 if (newname != NULL) { 1185 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1186 1187 free(de->ud.td_name, M_TMPFSNAME); 1188 de->ud.td_name = newname; 1189 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1190 1191 fnode->tn_status |= TMPFS_NODE_CHANGED; 1192 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1193 } 1194 1195 /* If we are overwriting an entry, we have to remove the old one 1196 * from the target directory. */ 1197 if (tvp != NULL) { 1198 struct tmpfs_dirent *tde; 1199 1200 /* Remove the old entry from the target directory. */ 1201 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1202 tmpfs_dir_detach(tdvp, tde); 1203 1204 /* Free the directory entry we just deleted. Note that the 1205 * node referred by it will not be removed until the vnode is 1206 * really reclaimed. */ 1207 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1208 } 1209 1210 tmpfs_dir_attach(tdvp, de); 1211 1212 cache_purge(fvp); 1213 if (tvp != NULL) 1214 cache_purge(tvp); 1215 cache_purge_negative(tdvp); 1216 1217 error = 0; 1218 1219out_locked: 1220 if (fdvp != tdvp && fdvp != tvp) 1221 VOP_UNLOCK(fdvp, 0); 1222 1223out: 1224 /* Release target nodes. */ 1225 /* XXX: I don't understand when tdvp can be the same as tvp, but 1226 * other code takes care of this... */ 1227 if (tdvp == tvp) 1228 vrele(tdvp); 1229 else 1230 vput(tdvp); 1231 if (tvp != NULL) 1232 vput(tvp); 1233 1234 /* Release source nodes. */ 1235 vrele(fdvp); 1236 vrele(fvp); 1237 1238 if (mp != NULL) 1239 vfs_unbusy(mp); 1240 1241 return error; 1242} 1243 1244/* --------------------------------------------------------------------- */ 1245 1246static int 1247tmpfs_mkdir(struct vop_mkdir_args *v) 1248{ 1249 struct vnode *dvp = v->a_dvp; 1250 struct vnode **vpp = v->a_vpp; 1251 struct componentname *cnp = v->a_cnp; 1252 struct vattr *vap = v->a_vap; 1253 1254 MPASS(vap->va_type == VDIR); 1255 1256 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1257} 1258 1259/* --------------------------------------------------------------------- */ 1260 1261static int 1262tmpfs_rmdir(struct vop_rmdir_args *v) 1263{ 1264 struct vnode *dvp = v->a_dvp; 1265 struct vnode *vp = v->a_vp; 1266 1267 int error; 1268 struct tmpfs_dirent *de; 1269 struct tmpfs_mount *tmp; 1270 struct tmpfs_node *dnode; 1271 struct tmpfs_node *node; 1272 1273 MPASS(VOP_ISLOCKED(dvp)); 1274 MPASS(VOP_ISLOCKED(vp)); 1275 1276 tmp = VFS_TO_TMPFS(dvp->v_mount); 1277 dnode = VP_TO_TMPFS_DIR(dvp); 1278 node = VP_TO_TMPFS_DIR(vp); 1279 1280 /* Directories with more than two entries ('.' and '..') cannot be 1281 * removed. */ 1282 if (node->tn_size > 0) { 1283 error = ENOTEMPTY; 1284 goto out; 1285 } 1286 1287 if ((dnode->tn_flags & APPEND) 1288 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1289 error = EPERM; 1290 goto out; 1291 } 1292 1293 /* This invariant holds only if we are not trying to remove "..". 1294 * We checked for that above so this is safe now. */ 1295 MPASS(node->tn_dir.tn_parent == dnode); 1296 1297 /* Get the directory entry associated with node (vp). This was 1298 * filled by tmpfs_lookup while looking up the entry. */ 1299 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1300 MPASS(TMPFS_DIRENT_MATCHES(de, 1301 v->a_cnp->cn_nameptr, 1302 v->a_cnp->cn_namelen)); 1303 1304 /* Check flags to see if we are allowed to remove the directory. */ 1305 if (dnode->tn_flags & APPEND 1306 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1307 error = EPERM; 1308 goto out; 1309 } 1310 1311 1312 /* Detach the directory entry from the directory (dnode). */ 1313 tmpfs_dir_detach(dvp, de); 1314 if (v->a_cnp->cn_flags & DOWHITEOUT) 1315 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1316 1317 /* No vnode should be allocated for this entry from this point */ 1318 TMPFS_NODE_LOCK(node); 1319 TMPFS_ASSERT_ELOCKED(node); 1320 node->tn_links--; 1321 node->tn_dir.tn_parent = NULL; 1322 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1323 TMPFS_NODE_MODIFIED; 1324 1325 TMPFS_NODE_UNLOCK(node); 1326 1327 TMPFS_NODE_LOCK(dnode); 1328 TMPFS_ASSERT_ELOCKED(dnode); 1329 dnode->tn_links--; 1330 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1331 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1332 TMPFS_NODE_UNLOCK(dnode); 1333 1334 cache_purge(dvp); 1335 cache_purge(vp); 1336 1337 /* Free the directory entry we just deleted. Note that the node 1338 * referred by it will not be removed until the vnode is really 1339 * reclaimed. */ 1340 tmpfs_free_dirent(tmp, de); 1341 1342 /* Release the deleted vnode (will destroy the node, notify 1343 * interested parties and clean it from the cache). */ 1344 1345 dnode->tn_status |= TMPFS_NODE_CHANGED; 1346 tmpfs_update(dvp); 1347 1348 error = 0; 1349 1350out: 1351 return error; 1352} 1353 1354/* --------------------------------------------------------------------- */ 1355 1356static int 1357tmpfs_symlink(struct vop_symlink_args *v) 1358{ 1359 struct vnode *dvp = v->a_dvp; 1360 struct vnode **vpp = v->a_vpp; 1361 struct componentname *cnp = v->a_cnp; 1362 struct vattr *vap = v->a_vap; 1363 char *target = v->a_target; 1364 1365#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1366 MPASS(vap->va_type == VLNK); 1367#else 1368 vap->va_type = VLNK; 1369#endif 1370 1371 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1372} 1373 1374/* --------------------------------------------------------------------- */ 1375 1376static int 1377tmpfs_readdir(struct vop_readdir_args *v) 1378{ 1379 struct vnode *vp = v->a_vp; 1380 struct uio *uio = v->a_uio; 1381 int *eofflag = v->a_eofflag; 1382 u_long **cookies = v->a_cookies; 1383 int *ncookies = v->a_ncookies; 1384 1385 int error; 1386 ssize_t startresid; 1387 int cnt = 0; 1388 struct tmpfs_node *node; 1389 1390 /* This operation only makes sense on directory nodes. */ 1391 if (vp->v_type != VDIR) 1392 return ENOTDIR; 1393 1394 node = VP_TO_TMPFS_DIR(vp); 1395 1396 startresid = uio->uio_resid; 1397 1398 if (cookies != NULL && ncookies != NULL) { 1399 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1400 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1401 *ncookies = 0; 1402 } 1403 1404 if (cnt == 0) 1405 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1406 else 1407 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1408 1409 if (error == EJUSTRETURN) 1410 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1411 1412 if (error != 0 && cnt != 0) 1413 free(*cookies, M_TEMP); 1414 1415 if (eofflag != NULL) 1416 *eofflag = 1417 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1418 1419 return error; 1420} 1421 1422/* --------------------------------------------------------------------- */ 1423 1424static int 1425tmpfs_readlink(struct vop_readlink_args *v) 1426{ 1427 struct vnode *vp = v->a_vp; 1428 struct uio *uio = v->a_uio; 1429 1430 int error; 1431 struct tmpfs_node *node; 1432 1433 MPASS(uio->uio_offset == 0); 1434 MPASS(vp->v_type == VLNK); 1435 1436 node = VP_TO_TMPFS_NODE(vp); 1437 1438 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1439 uio); 1440 node->tn_status |= TMPFS_NODE_ACCESSED; 1441 1442 return error; 1443} 1444 1445/* --------------------------------------------------------------------- */ 1446 1447static int 1448tmpfs_inactive(struct vop_inactive_args *v) 1449{ 1450 struct vnode *vp = v->a_vp; 1451 1452 struct tmpfs_node *node; 1453 1454 node = VP_TO_TMPFS_NODE(vp); 1455 1456 if (node->tn_links == 0) 1457 vrecycle(vp); 1458 1459 return 0; 1460} 1461 1462/* --------------------------------------------------------------------- */ 1463 1464int 1465tmpfs_reclaim(struct vop_reclaim_args *v) 1466{ 1467 struct vnode *vp = v->a_vp; 1468 1469 struct tmpfs_mount *tmp; 1470 struct tmpfs_node *node; 1471 1472 node = VP_TO_TMPFS_NODE(vp); 1473 tmp = VFS_TO_TMPFS(vp->v_mount); 1474 1475 if (vp->v_type == VREG) 1476 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1477 vp->v_object = NULL; 1478 cache_purge(vp); 1479 1480 TMPFS_NODE_LOCK(node); 1481 TMPFS_ASSERT_ELOCKED(node); 1482 tmpfs_free_vp(vp); 1483 1484 /* If the node referenced by this vnode was deleted by the user, 1485 * we must free its associated data structures (now that the vnode 1486 * is being reclaimed). */ 1487 if (node->tn_links == 0 && 1488 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1489 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1490 TMPFS_NODE_UNLOCK(node); 1491 tmpfs_free_node(tmp, node); 1492 } else 1493 TMPFS_NODE_UNLOCK(node); 1494 1495 MPASS(vp->v_data == NULL); 1496 return 0; 1497} 1498 1499/* --------------------------------------------------------------------- */ 1500 1501static int 1502tmpfs_print(struct vop_print_args *v) 1503{ 1504 struct vnode *vp = v->a_vp; 1505 1506 struct tmpfs_node *node; 1507 1508 node = VP_TO_TMPFS_NODE(vp); 1509 1510 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1511 node, node->tn_flags, node->tn_links); 1512 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1513 node->tn_mode, node->tn_uid, node->tn_gid, 1514 (intmax_t)node->tn_size, node->tn_status); 1515 1516 if (vp->v_type == VFIFO) 1517 fifo_printinfo(vp); 1518 1519 printf("\n"); 1520 1521 return 0; 1522} 1523 1524/* --------------------------------------------------------------------- */ 1525 1526static int 1527tmpfs_pathconf(struct vop_pathconf_args *v) 1528{ 1529 int name = v->a_name; 1530 register_t *retval = v->a_retval; 1531 1532 int error; 1533 1534 error = 0; 1535 1536 switch (name) { 1537 case _PC_LINK_MAX: 1538 *retval = LINK_MAX; 1539 break; 1540 1541 case _PC_NAME_MAX: 1542 *retval = NAME_MAX; 1543 break; 1544 1545 case _PC_PATH_MAX: 1546 *retval = PATH_MAX; 1547 break; 1548 1549 case _PC_PIPE_BUF: 1550 *retval = PIPE_BUF; 1551 break; 1552 1553 case _PC_CHOWN_RESTRICTED: 1554 *retval = 1; 1555 break; 1556 1557 case _PC_NO_TRUNC: 1558 *retval = 1; 1559 break; 1560 1561 case _PC_SYNC_IO: 1562 *retval = 1; 1563 break; 1564 1565 case _PC_FILESIZEBITS: 1566 *retval = 0; /* XXX Don't know which value should I return. */ 1567 break; 1568 1569 default: 1570 error = EINVAL; 1571 } 1572 1573 return error; 1574} 1575 1576static int 1577tmpfs_vptofh(struct vop_vptofh_args *ap) 1578{ 1579 struct tmpfs_fid *tfhp; 1580 struct tmpfs_node *node; 1581 1582 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1583 node = VP_TO_TMPFS_NODE(ap->a_vp); 1584 1585 tfhp->tf_len = sizeof(struct tmpfs_fid); 1586 tfhp->tf_id = node->tn_id; 1587 tfhp->tf_gen = node->tn_gen; 1588 1589 return (0); 1590} 1591 1592static int 1593tmpfs_whiteout(struct vop_whiteout_args *ap) 1594{ 1595 struct vnode *dvp = ap->a_dvp; 1596 struct componentname *cnp = ap->a_cnp; 1597 struct tmpfs_dirent *de; 1598 1599 switch (ap->a_flags) { 1600 case LOOKUP: 1601 return (0); 1602 case CREATE: 1603 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1604 if (de != NULL) 1605 return (de->td_node == NULL ? 0 : EEXIST); 1606 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1607 case DELETE: 1608 tmpfs_dir_whiteout_remove(dvp, cnp); 1609 return (0); 1610 default: 1611 panic("tmpfs_whiteout: unknown op"); 1612 } 1613} 1614 1615/* --------------------------------------------------------------------- */ 1616 1617/* 1618 * vnode operations vector used for files stored in a tmpfs file system. 1619 */ 1620struct vop_vector tmpfs_vnodeop_entries = { 1621 .vop_default = &default_vnodeops, 1622 .vop_lookup = vfs_cache_lookup, 1623 .vop_cachedlookup = tmpfs_lookup, 1624 .vop_create = tmpfs_create, 1625 .vop_mknod = tmpfs_mknod, 1626 .vop_open = tmpfs_open, 1627 .vop_close = tmpfs_close, 1628 .vop_access = tmpfs_access, 1629 .vop_getattr = tmpfs_getattr, 1630 .vop_setattr = tmpfs_setattr, 1631 .vop_read = tmpfs_read, 1632 .vop_write = tmpfs_write, 1633 .vop_fsync = tmpfs_fsync, 1634 .vop_remove = tmpfs_remove, 1635 .vop_link = tmpfs_link, 1636 .vop_rename = tmpfs_rename, 1637 .vop_mkdir = tmpfs_mkdir, 1638 .vop_rmdir = tmpfs_rmdir, 1639 .vop_symlink = tmpfs_symlink, 1640 .vop_readdir = tmpfs_readdir, 1641 .vop_readlink = tmpfs_readlink, 1642 .vop_inactive = tmpfs_inactive, 1643 .vop_reclaim = tmpfs_reclaim, 1644 .vop_print = tmpfs_print, 1645 .vop_pathconf = tmpfs_pathconf, 1646 .vop_vptofh = tmpfs_vptofh, 1647 .vop_whiteout = tmpfs_whiteout, 1648 .vop_bmap = VOP_EOPNOTSUPP, 1649}; 1650 1651