tmpfs_vnops.c revision 250190
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 250190 2013-05-02 18:46:31Z 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 /* 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 277static int 278tmpfs_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 290int 291tmpfs_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 338out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342} 343 344/* --------------------------------------------------------------------- */ 345 346int 347tmpfs_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... */ 385int 386tmpfs_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 441static int 442tmpfs_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 vm_page_deactivate(m); 497 /* Requeue to maintain LRU ordering. */ 498 if (m->queue != PQ_NONE) 499 vm_page_requeue(m); 500 vm_page_unlock(m); 501 VM_OBJECT_WUNLOCK(tobj); 502 503 return (error); 504} 505 506static int 507tmpfs_read(struct vop_read_args *v) 508{ 509 struct vnode *vp = v->a_vp; 510 struct uio *uio = v->a_uio; 511 struct tmpfs_node *node; 512 vm_object_t uobj; 513 size_t len; 514 int resid; 515 int error = 0; 516 vm_pindex_t idx; 517 vm_offset_t offset; 518 off_t addr; 519 size_t tlen; 520 521 node = VP_TO_TMPFS_NODE(vp); 522 523 if (vp->v_type != VREG) { 524 error = EISDIR; 525 goto out; 526 } 527 528 if (uio->uio_offset < 0) { 529 error = EINVAL; 530 goto out; 531 } 532 533 node->tn_status |= TMPFS_NODE_ACCESSED; 534 535 uobj = node->tn_reg.tn_aobj; 536 while ((resid = uio->uio_resid) > 0) { 537 error = 0; 538 if (node->tn_size <= uio->uio_offset) 539 break; 540 len = MIN(node->tn_size - uio->uio_offset, resid); 541 if (len == 0) 542 break; 543 addr = uio->uio_offset; 544 idx = OFF_TO_IDX(addr); 545 offset = addr & PAGE_MASK; 546 tlen = MIN(PAGE_SIZE - offset, len); 547 error = tmpfs_nocacheread(uobj, idx, offset, tlen, uio); 548 if ((error != 0) || (resid == uio->uio_resid)) 549 break; 550 } 551 552out: 553 554 return error; 555} 556 557/* --------------------------------------------------------------------- */ 558 559static int 560tmpfs_mappedwrite(vm_object_t tobj, size_t len, struct uio *uio) 561{ 562 vm_pindex_t idx; 563 vm_page_t tpg; 564 vm_offset_t offset; 565 off_t addr; 566 size_t tlen; 567 int error, rv; 568 569 error = 0; 570 571 addr = uio->uio_offset; 572 idx = OFF_TO_IDX(addr); 573 offset = addr & PAGE_MASK; 574 tlen = MIN(PAGE_SIZE - offset, len); 575 576 VM_OBJECT_WLOCK(tobj); 577 tpg = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 578 if (tpg->valid != VM_PAGE_BITS_ALL) { 579 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 580 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 581 tpg = vm_page_lookup(tobj, idx); 582 if (tpg == NULL) { 583 printf( 584 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 585 tobj, idx, rv); 586 return (EIO); 587 } 588 if (rv != VM_PAGER_OK) { 589 printf( 590 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 591 tobj, idx, tpg->valid, rv); 592 vm_page_lock(tpg); 593 vm_page_free(tpg); 594 vm_page_unlock(tpg); 595 VM_OBJECT_WUNLOCK(tobj); 596 return (EIO); 597 } 598 } else 599 vm_page_zero_invalid(tpg, TRUE); 600 } 601 vm_page_lock(tpg); 602 vm_page_hold(tpg); 603 vm_page_wakeup(tpg); 604 vm_page_unlock(tpg); 605 VM_OBJECT_WUNLOCK(tobj); 606 error = uiomove_fromphys(&tpg, offset, tlen, uio); 607 VM_OBJECT_WLOCK(tobj); 608 if (error == 0) 609 vm_page_dirty(tpg); 610 vm_page_lock(tpg); 611 vm_page_unhold(tpg); 612 vm_page_deactivate(tpg); 613 /* Requeue to maintain LRU ordering. */ 614 if (tpg->queue != PQ_NONE) 615 vm_page_requeue(tpg); 616 vm_page_unlock(tpg); 617 VM_OBJECT_WUNLOCK(tobj); 618 619 return (error); 620} 621 622static int 623tmpfs_write(struct vop_write_args *v) 624{ 625 struct vnode *vp = v->a_vp; 626 struct uio *uio = v->a_uio; 627 int ioflag = v->a_ioflag; 628 629 boolean_t extended; 630 int error = 0; 631 off_t oldsize; 632 struct tmpfs_node *node; 633 vm_object_t uobj; 634 size_t len; 635 int resid; 636 637 node = VP_TO_TMPFS_NODE(vp); 638 oldsize = node->tn_size; 639 640 if (uio->uio_offset < 0 || vp->v_type != VREG) { 641 error = EINVAL; 642 goto out; 643 } 644 645 if (uio->uio_resid == 0) { 646 error = 0; 647 goto out; 648 } 649 650 if (ioflag & IO_APPEND) 651 uio->uio_offset = node->tn_size; 652 653 if (uio->uio_offset + uio->uio_resid > 654 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 655 return (EFBIG); 656 657 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 658 return (EFBIG); 659 660 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 661 if (extended) { 662 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 663 FALSE); 664 if (error != 0) 665 goto out; 666 } 667 668 uobj = node->tn_reg.tn_aobj; 669 while ((resid = uio->uio_resid) > 0) { 670 if (node->tn_size <= uio->uio_offset) 671 break; 672 len = MIN(node->tn_size - uio->uio_offset, resid); 673 if (len == 0) 674 break; 675 error = tmpfs_mappedwrite(uobj, len, uio); 676 if ((error != 0) || (resid == uio->uio_resid)) 677 break; 678 } 679 680 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 681 (extended ? TMPFS_NODE_CHANGED : 0); 682 683 if (node->tn_mode & (S_ISUID | S_ISGID)) { 684 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 685 node->tn_mode &= ~(S_ISUID | S_ISGID); 686 } 687 688 if (error != 0) 689 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 690 691out: 692 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 693 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 694 695 return error; 696} 697 698/* --------------------------------------------------------------------- */ 699 700static int 701tmpfs_fsync(struct vop_fsync_args *v) 702{ 703 struct vnode *vp = v->a_vp; 704 705 MPASS(VOP_ISLOCKED(vp)); 706 707 tmpfs_update(vp); 708 709 return 0; 710} 711 712/* --------------------------------------------------------------------- */ 713 714static int 715tmpfs_remove(struct vop_remove_args *v) 716{ 717 struct vnode *dvp = v->a_dvp; 718 struct vnode *vp = v->a_vp; 719 720 int error; 721 struct tmpfs_dirent *de; 722 struct tmpfs_mount *tmp; 723 struct tmpfs_node *dnode; 724 struct tmpfs_node *node; 725 726 MPASS(VOP_ISLOCKED(dvp)); 727 MPASS(VOP_ISLOCKED(vp)); 728 729 if (vp->v_type == VDIR) { 730 error = EISDIR; 731 goto out; 732 } 733 734 dnode = VP_TO_TMPFS_DIR(dvp); 735 node = VP_TO_TMPFS_NODE(vp); 736 tmp = VFS_TO_TMPFS(vp->v_mount); 737 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 738 MPASS(de != NULL); 739 740 /* Files marked as immutable or append-only cannot be deleted. */ 741 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 742 (dnode->tn_flags & APPEND)) { 743 error = EPERM; 744 goto out; 745 } 746 747 /* Remove the entry from the directory; as it is a file, we do not 748 * have to change the number of hard links of the directory. */ 749 tmpfs_dir_detach(dvp, de); 750 if (v->a_cnp->cn_flags & DOWHITEOUT) 751 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 752 753 /* Free the directory entry we just deleted. Note that the node 754 * referred by it will not be removed until the vnode is really 755 * reclaimed. */ 756 tmpfs_free_dirent(tmp, de); 757 758 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 759 error = 0; 760 761out: 762 763 return error; 764} 765 766/* --------------------------------------------------------------------- */ 767 768static int 769tmpfs_link(struct vop_link_args *v) 770{ 771 struct vnode *dvp = v->a_tdvp; 772 struct vnode *vp = v->a_vp; 773 struct componentname *cnp = v->a_cnp; 774 775 int error; 776 struct tmpfs_dirent *de; 777 struct tmpfs_node *node; 778 779 MPASS(VOP_ISLOCKED(dvp)); 780 MPASS(cnp->cn_flags & HASBUF); 781 MPASS(dvp != vp); /* XXX When can this be false? */ 782 783 node = VP_TO_TMPFS_NODE(vp); 784 785 /* XXX: Why aren't the following two tests done by the caller? */ 786 787 /* Hard links of directories are forbidden. */ 788 if (vp->v_type == VDIR) { 789 error = EPERM; 790 goto out; 791 } 792 793 /* Cannot create cross-device links. */ 794 if (dvp->v_mount != vp->v_mount) { 795 error = EXDEV; 796 goto out; 797 } 798 799 /* Ensure that we do not overflow the maximum number of links imposed 800 * by the system. */ 801 MPASS(node->tn_links <= LINK_MAX); 802 if (node->tn_links == LINK_MAX) { 803 error = EMLINK; 804 goto out; 805 } 806 807 /* We cannot create links of files marked immutable or append-only. */ 808 if (node->tn_flags & (IMMUTABLE | APPEND)) { 809 error = EPERM; 810 goto out; 811 } 812 813 /* Allocate a new directory entry to represent the node. */ 814 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 815 cnp->cn_nameptr, cnp->cn_namelen, &de); 816 if (error != 0) 817 goto out; 818 819 /* Insert the new directory entry into the appropriate directory. */ 820 if (cnp->cn_flags & ISWHITEOUT) 821 tmpfs_dir_whiteout_remove(dvp, cnp); 822 tmpfs_dir_attach(dvp, de); 823 824 /* vp link count has changed, so update node times. */ 825 node->tn_status |= TMPFS_NODE_CHANGED; 826 tmpfs_update(vp); 827 828 error = 0; 829 830out: 831 return error; 832} 833 834/* --------------------------------------------------------------------- */ 835 836/* 837 * We acquire all but fdvp locks using non-blocking acquisitions. If we 838 * fail to acquire any lock in the path we will drop all held locks, 839 * acquire the new lock in a blocking fashion, and then release it and 840 * restart the rename. This acquire/release step ensures that we do not 841 * spin on a lock waiting for release. On error release all vnode locks 842 * and decrement references the way tmpfs_rename() would do. 843 */ 844static int 845tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 846 struct vnode *tdvp, struct vnode **tvpp, 847 struct componentname *fcnp, struct componentname *tcnp) 848{ 849 struct vnode *nvp; 850 struct mount *mp; 851 struct tmpfs_dirent *de; 852 int error, restarts = 0; 853 854 VOP_UNLOCK(tdvp, 0); 855 if (*tvpp != NULL && *tvpp != tdvp) 856 VOP_UNLOCK(*tvpp, 0); 857 mp = fdvp->v_mount; 858 859relock: 860 restarts += 1; 861 error = vn_lock(fdvp, LK_EXCLUSIVE); 862 if (error) 863 goto releout; 864 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 865 VOP_UNLOCK(fdvp, 0); 866 error = vn_lock(tdvp, LK_EXCLUSIVE); 867 if (error) 868 goto releout; 869 VOP_UNLOCK(tdvp, 0); 870 goto relock; 871 } 872 /* 873 * Re-resolve fvp to be certain it still exists and fetch the 874 * correct vnode. 875 */ 876 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 877 if (de == NULL) { 878 VOP_UNLOCK(fdvp, 0); 879 VOP_UNLOCK(tdvp, 0); 880 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 881 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 882 error = EINVAL; 883 else 884 error = ENOENT; 885 goto releout; 886 } 887 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 888 if (error != 0) { 889 VOP_UNLOCK(fdvp, 0); 890 VOP_UNLOCK(tdvp, 0); 891 if (error != EBUSY) 892 goto releout; 893 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 894 if (error != 0) 895 goto releout; 896 VOP_UNLOCK(nvp, 0); 897 /* 898 * Concurrent rename race. 899 */ 900 if (nvp == tdvp) { 901 vrele(nvp); 902 error = EINVAL; 903 goto releout; 904 } 905 vrele(*fvpp); 906 *fvpp = nvp; 907 goto relock; 908 } 909 vrele(*fvpp); 910 *fvpp = nvp; 911 VOP_UNLOCK(*fvpp, 0); 912 /* 913 * Re-resolve tvp and acquire the vnode lock if present. 914 */ 915 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 916 /* 917 * If tvp disappeared we just carry on. 918 */ 919 if (de == NULL && *tvpp != NULL) { 920 vrele(*tvpp); 921 *tvpp = NULL; 922 } 923 /* 924 * Get the tvp ino if the lookup succeeded. We may have to restart 925 * if the non-blocking acquire fails. 926 */ 927 if (de != NULL) { 928 nvp = NULL; 929 error = tmpfs_alloc_vp(mp, de->td_node, 930 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 931 if (*tvpp != NULL) 932 vrele(*tvpp); 933 *tvpp = nvp; 934 if (error != 0) { 935 VOP_UNLOCK(fdvp, 0); 936 VOP_UNLOCK(tdvp, 0); 937 if (error != EBUSY) 938 goto releout; 939 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 940 &nvp); 941 if (error != 0) 942 goto releout; 943 VOP_UNLOCK(nvp, 0); 944 /* 945 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 946 */ 947 if (nvp == fdvp) { 948 error = ENOTEMPTY; 949 goto releout; 950 } 951 goto relock; 952 } 953 } 954 tmpfs_rename_restarts += restarts; 955 956 return (0); 957 958releout: 959 vrele(fdvp); 960 vrele(*fvpp); 961 vrele(tdvp); 962 if (*tvpp != NULL) 963 vrele(*tvpp); 964 tmpfs_rename_restarts += restarts; 965 966 return (error); 967} 968 969static int 970tmpfs_rename(struct vop_rename_args *v) 971{ 972 struct vnode *fdvp = v->a_fdvp; 973 struct vnode *fvp = v->a_fvp; 974 struct componentname *fcnp = v->a_fcnp; 975 struct vnode *tdvp = v->a_tdvp; 976 struct vnode *tvp = v->a_tvp; 977 struct componentname *tcnp = v->a_tcnp; 978 struct mount *mp = NULL; 979 980 char *newname; 981 int error; 982 struct tmpfs_dirent *de; 983 struct tmpfs_mount *tmp; 984 struct tmpfs_node *fdnode; 985 struct tmpfs_node *fnode; 986 struct tmpfs_node *tnode; 987 struct tmpfs_node *tdnode; 988 989 MPASS(VOP_ISLOCKED(tdvp)); 990 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 991 MPASS(fcnp->cn_flags & HASBUF); 992 MPASS(tcnp->cn_flags & HASBUF); 993 994 /* Disallow cross-device renames. 995 * XXX Why isn't this done by the caller? */ 996 if (fvp->v_mount != tdvp->v_mount || 997 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 998 error = EXDEV; 999 goto out; 1000 } 1001 1002 /* If source and target are the same file, there is nothing to do. */ 1003 if (fvp == tvp) { 1004 error = 0; 1005 goto out; 1006 } 1007 1008 /* If we need to move the directory between entries, lock the 1009 * source so that we can safely operate on it. */ 1010 if (fdvp != tdvp && fdvp != tvp) { 1011 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1012 mp = tdvp->v_mount; 1013 error = vfs_busy(mp, 0); 1014 if (error != 0) { 1015 mp = NULL; 1016 goto out; 1017 } 1018 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1019 fcnp, tcnp); 1020 if (error != 0) { 1021 vfs_unbusy(mp); 1022 return (error); 1023 } 1024 ASSERT_VOP_ELOCKED(fdvp, 1025 "tmpfs_rename: fdvp not locked"); 1026 ASSERT_VOP_ELOCKED(tdvp, 1027 "tmpfs_rename: tdvp not locked"); 1028 if (tvp != NULL) 1029 ASSERT_VOP_ELOCKED(tvp, 1030 "tmpfs_rename: tvp not locked"); 1031 if (fvp == tvp) { 1032 error = 0; 1033 goto out_locked; 1034 } 1035 } 1036 } 1037 1038 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1039 tdnode = VP_TO_TMPFS_DIR(tdvp); 1040 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1041 fdnode = VP_TO_TMPFS_DIR(fdvp); 1042 fnode = VP_TO_TMPFS_NODE(fvp); 1043 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1044 1045 /* Entry can disappear before we lock fdvp, 1046 * also avoid manipulating '.' and '..' entries. */ 1047 if (de == NULL) { 1048 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1049 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1050 error = EINVAL; 1051 else 1052 error = ENOENT; 1053 goto out_locked; 1054 } 1055 MPASS(de->td_node == fnode); 1056 1057 /* If re-naming a directory to another preexisting directory 1058 * ensure that the target directory is empty so that its 1059 * removal causes no side effects. 1060 * Kern_rename gurantees the destination to be a directory 1061 * if the source is one. */ 1062 if (tvp != NULL) { 1063 MPASS(tnode != NULL); 1064 1065 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1066 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1067 error = EPERM; 1068 goto out_locked; 1069 } 1070 1071 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1072 if (tnode->tn_size > 0) { 1073 error = ENOTEMPTY; 1074 goto out_locked; 1075 } 1076 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1077 error = ENOTDIR; 1078 goto out_locked; 1079 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1080 error = EISDIR; 1081 goto out_locked; 1082 } else { 1083 MPASS(fnode->tn_type != VDIR && 1084 tnode->tn_type != VDIR); 1085 } 1086 } 1087 1088 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1089 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1090 error = EPERM; 1091 goto out_locked; 1092 } 1093 1094 /* Ensure that we have enough memory to hold the new name, if it 1095 * has to be changed. */ 1096 if (fcnp->cn_namelen != tcnp->cn_namelen || 1097 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1098 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1099 } else 1100 newname = NULL; 1101 1102 /* If the node is being moved to another directory, we have to do 1103 * the move. */ 1104 if (fdnode != tdnode) { 1105 /* In case we are moving a directory, we have to adjust its 1106 * parent to point to the new parent. */ 1107 if (de->td_node->tn_type == VDIR) { 1108 struct tmpfs_node *n; 1109 1110 /* Ensure the target directory is not a child of the 1111 * directory being moved. Otherwise, we'd end up 1112 * with stale nodes. */ 1113 n = tdnode; 1114 /* TMPFS_LOCK garanties that no nodes are freed while 1115 * traversing the list. Nodes can only be marked as 1116 * removed: tn_parent == NULL. */ 1117 TMPFS_LOCK(tmp); 1118 TMPFS_NODE_LOCK(n); 1119 while (n != n->tn_dir.tn_parent) { 1120 struct tmpfs_node *parent; 1121 1122 if (n == fnode) { 1123 TMPFS_NODE_UNLOCK(n); 1124 TMPFS_UNLOCK(tmp); 1125 error = EINVAL; 1126 if (newname != NULL) 1127 free(newname, M_TMPFSNAME); 1128 goto out_locked; 1129 } 1130 parent = n->tn_dir.tn_parent; 1131 TMPFS_NODE_UNLOCK(n); 1132 if (parent == NULL) { 1133 n = NULL; 1134 break; 1135 } 1136 TMPFS_NODE_LOCK(parent); 1137 if (parent->tn_dir.tn_parent == NULL) { 1138 TMPFS_NODE_UNLOCK(parent); 1139 n = NULL; 1140 break; 1141 } 1142 n = parent; 1143 } 1144 TMPFS_UNLOCK(tmp); 1145 if (n == NULL) { 1146 error = EINVAL; 1147 if (newname != NULL) 1148 free(newname, M_TMPFSNAME); 1149 goto out_locked; 1150 } 1151 TMPFS_NODE_UNLOCK(n); 1152 1153 /* Adjust the parent pointer. */ 1154 TMPFS_VALIDATE_DIR(fnode); 1155 TMPFS_NODE_LOCK(de->td_node); 1156 de->td_node->tn_dir.tn_parent = tdnode; 1157 TMPFS_NODE_UNLOCK(de->td_node); 1158 1159 /* As a result of changing the target of the '..' 1160 * entry, the link count of the source and target 1161 * directories has to be adjusted. */ 1162 TMPFS_NODE_LOCK(tdnode); 1163 TMPFS_ASSERT_LOCKED(tdnode); 1164 tdnode->tn_links++; 1165 TMPFS_NODE_UNLOCK(tdnode); 1166 1167 TMPFS_NODE_LOCK(fdnode); 1168 TMPFS_ASSERT_LOCKED(fdnode); 1169 fdnode->tn_links--; 1170 TMPFS_NODE_UNLOCK(fdnode); 1171 } 1172 } 1173 1174 /* Do the move: just remove the entry from the source directory 1175 * and insert it into the target one. */ 1176 tmpfs_dir_detach(fdvp, de); 1177 1178 if (fcnp->cn_flags & DOWHITEOUT) 1179 tmpfs_dir_whiteout_add(fdvp, fcnp); 1180 if (tcnp->cn_flags & ISWHITEOUT) 1181 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1182 1183 /* If the name has changed, we need to make it effective by changing 1184 * it in the directory entry. */ 1185 if (newname != NULL) { 1186 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1187 1188 free(de->ud.td_name, M_TMPFSNAME); 1189 de->ud.td_name = newname; 1190 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1191 1192 fnode->tn_status |= TMPFS_NODE_CHANGED; 1193 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1194 } 1195 1196 /* If we are overwriting an entry, we have to remove the old one 1197 * from the target directory. */ 1198 if (tvp != NULL) { 1199 struct tmpfs_dirent *tde; 1200 1201 /* Remove the old entry from the target directory. */ 1202 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1203 tmpfs_dir_detach(tdvp, tde); 1204 1205 /* Free the directory entry we just deleted. Note that the 1206 * node referred by it will not be removed until the vnode is 1207 * really reclaimed. */ 1208 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1209 } 1210 1211 tmpfs_dir_attach(tdvp, de); 1212 1213 cache_purge(fvp); 1214 if (tvp != NULL) 1215 cache_purge(tvp); 1216 cache_purge_negative(tdvp); 1217 1218 error = 0; 1219 1220out_locked: 1221 if (fdvp != tdvp && fdvp != tvp) 1222 VOP_UNLOCK(fdvp, 0); 1223 1224out: 1225 /* Release target nodes. */ 1226 /* XXX: I don't understand when tdvp can be the same as tvp, but 1227 * other code takes care of this... */ 1228 if (tdvp == tvp) 1229 vrele(tdvp); 1230 else 1231 vput(tdvp); 1232 if (tvp != NULL) 1233 vput(tvp); 1234 1235 /* Release source nodes. */ 1236 vrele(fdvp); 1237 vrele(fvp); 1238 1239 if (mp != NULL) 1240 vfs_unbusy(mp); 1241 1242 return error; 1243} 1244 1245/* --------------------------------------------------------------------- */ 1246 1247static int 1248tmpfs_mkdir(struct vop_mkdir_args *v) 1249{ 1250 struct vnode *dvp = v->a_dvp; 1251 struct vnode **vpp = v->a_vpp; 1252 struct componentname *cnp = v->a_cnp; 1253 struct vattr *vap = v->a_vap; 1254 1255 MPASS(vap->va_type == VDIR); 1256 1257 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1258} 1259 1260/* --------------------------------------------------------------------- */ 1261 1262static int 1263tmpfs_rmdir(struct vop_rmdir_args *v) 1264{ 1265 struct vnode *dvp = v->a_dvp; 1266 struct vnode *vp = v->a_vp; 1267 1268 int error; 1269 struct tmpfs_dirent *de; 1270 struct tmpfs_mount *tmp; 1271 struct tmpfs_node *dnode; 1272 struct tmpfs_node *node; 1273 1274 MPASS(VOP_ISLOCKED(dvp)); 1275 MPASS(VOP_ISLOCKED(vp)); 1276 1277 tmp = VFS_TO_TMPFS(dvp->v_mount); 1278 dnode = VP_TO_TMPFS_DIR(dvp); 1279 node = VP_TO_TMPFS_DIR(vp); 1280 1281 /* Directories with more than two entries ('.' and '..') cannot be 1282 * removed. */ 1283 if (node->tn_size > 0) { 1284 error = ENOTEMPTY; 1285 goto out; 1286 } 1287 1288 if ((dnode->tn_flags & APPEND) 1289 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1290 error = EPERM; 1291 goto out; 1292 } 1293 1294 /* This invariant holds only if we are not trying to remove "..". 1295 * We checked for that above so this is safe now. */ 1296 MPASS(node->tn_dir.tn_parent == dnode); 1297 1298 /* Get the directory entry associated with node (vp). This was 1299 * filled by tmpfs_lookup while looking up the entry. */ 1300 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1301 MPASS(TMPFS_DIRENT_MATCHES(de, 1302 v->a_cnp->cn_nameptr, 1303 v->a_cnp->cn_namelen)); 1304 1305 /* Check flags to see if we are allowed to remove the directory. */ 1306 if (dnode->tn_flags & APPEND 1307 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1308 error = EPERM; 1309 goto out; 1310 } 1311 1312 1313 /* Detach the directory entry from the directory (dnode). */ 1314 tmpfs_dir_detach(dvp, de); 1315 if (v->a_cnp->cn_flags & DOWHITEOUT) 1316 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1317 1318 /* No vnode should be allocated for this entry from this point */ 1319 TMPFS_NODE_LOCK(node); 1320 TMPFS_ASSERT_ELOCKED(node); 1321 node->tn_links--; 1322 node->tn_dir.tn_parent = NULL; 1323 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1324 TMPFS_NODE_MODIFIED; 1325 1326 TMPFS_NODE_UNLOCK(node); 1327 1328 TMPFS_NODE_LOCK(dnode); 1329 TMPFS_ASSERT_ELOCKED(dnode); 1330 dnode->tn_links--; 1331 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1332 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1333 TMPFS_NODE_UNLOCK(dnode); 1334 1335 cache_purge(dvp); 1336 cache_purge(vp); 1337 1338 /* Free the directory entry we just deleted. Note that the node 1339 * referred by it will not be removed until the vnode is really 1340 * reclaimed. */ 1341 tmpfs_free_dirent(tmp, de); 1342 1343 /* Release the deleted vnode (will destroy the node, notify 1344 * interested parties and clean it from the cache). */ 1345 1346 dnode->tn_status |= TMPFS_NODE_CHANGED; 1347 tmpfs_update(dvp); 1348 1349 error = 0; 1350 1351out: 1352 return error; 1353} 1354 1355/* --------------------------------------------------------------------- */ 1356 1357static int 1358tmpfs_symlink(struct vop_symlink_args *v) 1359{ 1360 struct vnode *dvp = v->a_dvp; 1361 struct vnode **vpp = v->a_vpp; 1362 struct componentname *cnp = v->a_cnp; 1363 struct vattr *vap = v->a_vap; 1364 char *target = v->a_target; 1365 1366#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1367 MPASS(vap->va_type == VLNK); 1368#else 1369 vap->va_type = VLNK; 1370#endif 1371 1372 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1373} 1374 1375/* --------------------------------------------------------------------- */ 1376 1377static int 1378tmpfs_readdir(struct vop_readdir_args *v) 1379{ 1380 struct vnode *vp = v->a_vp; 1381 struct uio *uio = v->a_uio; 1382 int *eofflag = v->a_eofflag; 1383 u_long **cookies = v->a_cookies; 1384 int *ncookies = v->a_ncookies; 1385 1386 int error; 1387 ssize_t startresid; 1388 int cnt = 0; 1389 struct tmpfs_node *node; 1390 1391 /* This operation only makes sense on directory nodes. */ 1392 if (vp->v_type != VDIR) 1393 return ENOTDIR; 1394 1395 node = VP_TO_TMPFS_DIR(vp); 1396 1397 startresid = uio->uio_resid; 1398 1399 if (cookies != NULL && ncookies != NULL) { 1400 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1401 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1402 *ncookies = 0; 1403 } 1404 1405 if (cnt == 0) 1406 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1407 else 1408 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1409 1410 if (error == EJUSTRETURN) 1411 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1412 1413 if (error != 0 && cnt != 0) 1414 free(*cookies, M_TEMP); 1415 1416 if (eofflag != NULL) 1417 *eofflag = 1418 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1419 1420 return error; 1421} 1422 1423/* --------------------------------------------------------------------- */ 1424 1425static int 1426tmpfs_readlink(struct vop_readlink_args *v) 1427{ 1428 struct vnode *vp = v->a_vp; 1429 struct uio *uio = v->a_uio; 1430 1431 int error; 1432 struct tmpfs_node *node; 1433 1434 MPASS(uio->uio_offset == 0); 1435 MPASS(vp->v_type == VLNK); 1436 1437 node = VP_TO_TMPFS_NODE(vp); 1438 1439 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1440 uio); 1441 node->tn_status |= TMPFS_NODE_ACCESSED; 1442 1443 return error; 1444} 1445 1446/* --------------------------------------------------------------------- */ 1447 1448static int 1449tmpfs_inactive(struct vop_inactive_args *v) 1450{ 1451 struct vnode *vp = v->a_vp; 1452 1453 struct tmpfs_node *node; 1454 1455 node = VP_TO_TMPFS_NODE(vp); 1456 1457 if (node->tn_links == 0) 1458 vrecycle(vp); 1459 1460 return 0; 1461} 1462 1463/* --------------------------------------------------------------------- */ 1464 1465int 1466tmpfs_reclaim(struct vop_reclaim_args *v) 1467{ 1468 struct vnode *vp = v->a_vp; 1469 1470 struct tmpfs_mount *tmp; 1471 struct tmpfs_node *node; 1472 1473 node = VP_TO_TMPFS_NODE(vp); 1474 tmp = VFS_TO_TMPFS(vp->v_mount); 1475 1476 if (vp->v_type == VREG) 1477 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1478 else 1479 vnode_destroy_vobject(vp); 1480 vp->v_object = NULL; 1481 cache_purge(vp); 1482 1483 TMPFS_NODE_LOCK(node); 1484 TMPFS_ASSERT_ELOCKED(node); 1485 tmpfs_free_vp(vp); 1486 1487 /* If the node referenced by this vnode was deleted by the user, 1488 * we must free its associated data structures (now that the vnode 1489 * is being reclaimed). */ 1490 if (node->tn_links == 0 && 1491 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1492 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1493 TMPFS_NODE_UNLOCK(node); 1494 tmpfs_free_node(tmp, node); 1495 } else 1496 TMPFS_NODE_UNLOCK(node); 1497 1498 MPASS(vp->v_data == NULL); 1499 return 0; 1500} 1501 1502/* --------------------------------------------------------------------- */ 1503 1504static int 1505tmpfs_print(struct vop_print_args *v) 1506{ 1507 struct vnode *vp = v->a_vp; 1508 1509 struct tmpfs_node *node; 1510 1511 node = VP_TO_TMPFS_NODE(vp); 1512 1513 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1514 node, node->tn_flags, node->tn_links); 1515 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1516 node->tn_mode, node->tn_uid, node->tn_gid, 1517 (intmax_t)node->tn_size, node->tn_status); 1518 1519 if (vp->v_type == VFIFO) 1520 fifo_printinfo(vp); 1521 1522 printf("\n"); 1523 1524 return 0; 1525} 1526 1527/* --------------------------------------------------------------------- */ 1528 1529static int 1530tmpfs_pathconf(struct vop_pathconf_args *v) 1531{ 1532 int name = v->a_name; 1533 register_t *retval = v->a_retval; 1534 1535 int error; 1536 1537 error = 0; 1538 1539 switch (name) { 1540 case _PC_LINK_MAX: 1541 *retval = LINK_MAX; 1542 break; 1543 1544 case _PC_NAME_MAX: 1545 *retval = NAME_MAX; 1546 break; 1547 1548 case _PC_PATH_MAX: 1549 *retval = PATH_MAX; 1550 break; 1551 1552 case _PC_PIPE_BUF: 1553 *retval = PIPE_BUF; 1554 break; 1555 1556 case _PC_CHOWN_RESTRICTED: 1557 *retval = 1; 1558 break; 1559 1560 case _PC_NO_TRUNC: 1561 *retval = 1; 1562 break; 1563 1564 case _PC_SYNC_IO: 1565 *retval = 1; 1566 break; 1567 1568 case _PC_FILESIZEBITS: 1569 *retval = 0; /* XXX Don't know which value should I return. */ 1570 break; 1571 1572 default: 1573 error = EINVAL; 1574 } 1575 1576 return error; 1577} 1578 1579static int 1580tmpfs_vptofh(struct vop_vptofh_args *ap) 1581{ 1582 struct tmpfs_fid *tfhp; 1583 struct tmpfs_node *node; 1584 1585 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1586 node = VP_TO_TMPFS_NODE(ap->a_vp); 1587 1588 tfhp->tf_len = sizeof(struct tmpfs_fid); 1589 tfhp->tf_id = node->tn_id; 1590 tfhp->tf_gen = node->tn_gen; 1591 1592 return (0); 1593} 1594 1595static int 1596tmpfs_whiteout(struct vop_whiteout_args *ap) 1597{ 1598 struct vnode *dvp = ap->a_dvp; 1599 struct componentname *cnp = ap->a_cnp; 1600 struct tmpfs_dirent *de; 1601 1602 switch (ap->a_flags) { 1603 case LOOKUP: 1604 return (0); 1605 case CREATE: 1606 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1607 if (de != NULL) 1608 return (de->td_node == NULL ? 0 : EEXIST); 1609 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1610 case DELETE: 1611 tmpfs_dir_whiteout_remove(dvp, cnp); 1612 return (0); 1613 default: 1614 panic("tmpfs_whiteout: unknown op"); 1615 } 1616} 1617 1618/* --------------------------------------------------------------------- */ 1619 1620/* 1621 * vnode operations vector used for files stored in a tmpfs file system. 1622 */ 1623struct vop_vector tmpfs_vnodeop_entries = { 1624 .vop_default = &default_vnodeops, 1625 .vop_lookup = vfs_cache_lookup, 1626 .vop_cachedlookup = tmpfs_lookup, 1627 .vop_create = tmpfs_create, 1628 .vop_mknod = tmpfs_mknod, 1629 .vop_open = tmpfs_open, 1630 .vop_close = tmpfs_close, 1631 .vop_access = tmpfs_access, 1632 .vop_getattr = tmpfs_getattr, 1633 .vop_setattr = tmpfs_setattr, 1634 .vop_read = tmpfs_read, 1635 .vop_write = tmpfs_write, 1636 .vop_fsync = tmpfs_fsync, 1637 .vop_remove = tmpfs_remove, 1638 .vop_link = tmpfs_link, 1639 .vop_rename = tmpfs_rename, 1640 .vop_mkdir = tmpfs_mkdir, 1641 .vop_rmdir = tmpfs_rmdir, 1642 .vop_symlink = tmpfs_symlink, 1643 .vop_readdir = tmpfs_readdir, 1644 .vop_readlink = tmpfs_readlink, 1645 .vop_inactive = tmpfs_inactive, 1646 .vop_reclaim = tmpfs_reclaim, 1647 .vop_print = tmpfs_print, 1648 .vop_pathconf = tmpfs_pathconf, 1649 .vop_vptofh = tmpfs_vptofh, 1650 .vop_whiteout = tmpfs_whiteout, 1651 .vop_bmap = VOP_EOPNOTSUPP, 1652}; 1653 1654