tmpfs_vnops.c revision 253939
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 253939 2013-08-04 21:07:24Z attilio $"); 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 * Parallel reads of the page content from disk are prevented 452 * by VPO_BUSY. 453 * 454 * Although the tmpfs vnode lock is held here, it is 455 * nonetheless safe to sleep waiting for a free page. The 456 * pageout daemon does not need to acquire the tmpfs vnode 457 * lock to page out tobj's pages because tobj is a OBJT_SWAP 458 * type object. 459 */ 460 m = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_RETRY | 461 VM_ALLOC_NOBUSY); 462 if (m->valid != VM_PAGE_BITS_ALL) { 463 vm_page_busy(m); 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 VM_OBJECT_WUNLOCK(tobj); 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 vm_page_wakeup(m); 487 } 488 vm_page_io_start(m); 489 VM_OBJECT_WUNLOCK(tobj); 490 error = uiomove_fromphys(&m, offset, tlen, uio); 491 VM_OBJECT_WLOCK(tobj); 492 vm_page_io_finish(m); 493 VM_OBJECT_WUNLOCK(tobj); 494 vm_page_lock(m); 495 if (m->queue == PQ_NONE) { 496 vm_page_deactivate(m); 497 } else { 498 /* Requeue to maintain LRU ordering. */ 499 vm_page_requeue(m); 500 } 501 vm_page_unlock(m); 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_NOBUSY | 578 VM_ALLOC_RETRY); 579 if (tpg->valid != VM_PAGE_BITS_ALL) { 580 vm_page_busy(tpg); 581 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 582 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 583 tpg = vm_page_lookup(tobj, idx); 584 if (tpg == NULL) { 585 printf( 586 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 587 tobj, idx, rv); 588 VM_OBJECT_WUNLOCK(tobj); 589 return (EIO); 590 } 591 if (rv != VM_PAGER_OK) { 592 printf( 593 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 594 tobj, idx, tpg->valid, rv); 595 vm_page_lock(tpg); 596 vm_page_free(tpg); 597 vm_page_unlock(tpg); 598 VM_OBJECT_WUNLOCK(tobj); 599 return (EIO); 600 } 601 } else 602 vm_page_zero_invalid(tpg, TRUE); 603 vm_page_wakeup(tpg); 604 } 605 vm_page_io_start(tpg); 606 VM_OBJECT_WUNLOCK(tobj); 607 error = uiomove_fromphys(&tpg, offset, tlen, uio); 608 VM_OBJECT_WLOCK(tobj); 609 vm_page_io_finish(tpg); 610 if (error == 0) 611 vm_page_dirty(tpg); 612 vm_page_lock(tpg); 613 if (tpg->queue == PQ_NONE) { 614 vm_page_deactivate(tpg); 615 } else { 616 /* Requeue to maintain LRU ordering. */ 617 vm_page_requeue(tpg); 618 } 619 vm_page_unlock(tpg); 620 VM_OBJECT_WUNLOCK(tobj); 621 622 return (error); 623} 624 625static int 626tmpfs_write(struct vop_write_args *v) 627{ 628 struct vnode *vp = v->a_vp; 629 struct uio *uio = v->a_uio; 630 int ioflag = v->a_ioflag; 631 632 boolean_t extended; 633 int error = 0; 634 off_t oldsize; 635 struct tmpfs_node *node; 636 vm_object_t uobj; 637 size_t len; 638 int resid; 639 640 node = VP_TO_TMPFS_NODE(vp); 641 oldsize = node->tn_size; 642 643 if (uio->uio_offset < 0 || vp->v_type != VREG) { 644 error = EINVAL; 645 goto out; 646 } 647 648 if (uio->uio_resid == 0) { 649 error = 0; 650 goto out; 651 } 652 653 if (ioflag & IO_APPEND) 654 uio->uio_offset = node->tn_size; 655 656 if (uio->uio_offset + uio->uio_resid > 657 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 658 return (EFBIG); 659 660 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 661 return (EFBIG); 662 663 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 664 if (extended) { 665 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 666 FALSE); 667 if (error != 0) 668 goto out; 669 } 670 671 uobj = node->tn_reg.tn_aobj; 672 while ((resid = uio->uio_resid) > 0) { 673 if (node->tn_size <= uio->uio_offset) 674 break; 675 len = MIN(node->tn_size - uio->uio_offset, resid); 676 if (len == 0) 677 break; 678 error = tmpfs_mappedwrite(uobj, len, uio); 679 if ((error != 0) || (resid == uio->uio_resid)) 680 break; 681 } 682 683 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 684 (extended ? TMPFS_NODE_CHANGED : 0); 685 686 if (node->tn_mode & (S_ISUID | S_ISGID)) { 687 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 688 node->tn_mode &= ~(S_ISUID | S_ISGID); 689 } 690 691 if (error != 0) 692 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 693 694out: 695 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 696 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 697 698 return error; 699} 700 701/* --------------------------------------------------------------------- */ 702 703static int 704tmpfs_fsync(struct vop_fsync_args *v) 705{ 706 struct vnode *vp = v->a_vp; 707 708 MPASS(VOP_ISLOCKED(vp)); 709 710 tmpfs_update(vp); 711 712 return 0; 713} 714 715/* --------------------------------------------------------------------- */ 716 717static int 718tmpfs_remove(struct vop_remove_args *v) 719{ 720 struct vnode *dvp = v->a_dvp; 721 struct vnode *vp = v->a_vp; 722 723 int error; 724 struct tmpfs_dirent *de; 725 struct tmpfs_mount *tmp; 726 struct tmpfs_node *dnode; 727 struct tmpfs_node *node; 728 729 MPASS(VOP_ISLOCKED(dvp)); 730 MPASS(VOP_ISLOCKED(vp)); 731 732 if (vp->v_type == VDIR) { 733 error = EISDIR; 734 goto out; 735 } 736 737 dnode = VP_TO_TMPFS_DIR(dvp); 738 node = VP_TO_TMPFS_NODE(vp); 739 tmp = VFS_TO_TMPFS(vp->v_mount); 740 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 741 MPASS(de != NULL); 742 743 /* Files marked as immutable or append-only cannot be deleted. */ 744 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 745 (dnode->tn_flags & APPEND)) { 746 error = EPERM; 747 goto out; 748 } 749 750 /* Remove the entry from the directory; as it is a file, we do not 751 * have to change the number of hard links of the directory. */ 752 tmpfs_dir_detach(dvp, de); 753 if (v->a_cnp->cn_flags & DOWHITEOUT) 754 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 755 756 /* Free the directory entry we just deleted. Note that the node 757 * referred by it will not be removed until the vnode is really 758 * reclaimed. */ 759 tmpfs_free_dirent(tmp, de); 760 761 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 762 error = 0; 763 764out: 765 766 return error; 767} 768 769/* --------------------------------------------------------------------- */ 770 771static int 772tmpfs_link(struct vop_link_args *v) 773{ 774 struct vnode *dvp = v->a_tdvp; 775 struct vnode *vp = v->a_vp; 776 struct componentname *cnp = v->a_cnp; 777 778 int error; 779 struct tmpfs_dirent *de; 780 struct tmpfs_node *node; 781 782 MPASS(VOP_ISLOCKED(dvp)); 783 MPASS(cnp->cn_flags & HASBUF); 784 MPASS(dvp != vp); /* XXX When can this be false? */ 785 786 node = VP_TO_TMPFS_NODE(vp); 787 788 /* XXX: Why aren't the following two tests done by the caller? */ 789 790 /* Hard links of directories are forbidden. */ 791 if (vp->v_type == VDIR) { 792 error = EPERM; 793 goto out; 794 } 795 796 /* Cannot create cross-device links. */ 797 if (dvp->v_mount != vp->v_mount) { 798 error = EXDEV; 799 goto out; 800 } 801 802 /* Ensure that we do not overflow the maximum number of links imposed 803 * by the system. */ 804 MPASS(node->tn_links <= LINK_MAX); 805 if (node->tn_links == LINK_MAX) { 806 error = EMLINK; 807 goto out; 808 } 809 810 /* We cannot create links of files marked immutable or append-only. */ 811 if (node->tn_flags & (IMMUTABLE | APPEND)) { 812 error = EPERM; 813 goto out; 814 } 815 816 /* Allocate a new directory entry to represent the node. */ 817 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 818 cnp->cn_nameptr, cnp->cn_namelen, &de); 819 if (error != 0) 820 goto out; 821 822 /* Insert the new directory entry into the appropriate directory. */ 823 if (cnp->cn_flags & ISWHITEOUT) 824 tmpfs_dir_whiteout_remove(dvp, cnp); 825 tmpfs_dir_attach(dvp, de); 826 827 /* vp link count has changed, so update node times. */ 828 node->tn_status |= TMPFS_NODE_CHANGED; 829 tmpfs_update(vp); 830 831 error = 0; 832 833out: 834 return error; 835} 836 837/* --------------------------------------------------------------------- */ 838 839/* 840 * We acquire all but fdvp locks using non-blocking acquisitions. If we 841 * fail to acquire any lock in the path we will drop all held locks, 842 * acquire the new lock in a blocking fashion, and then release it and 843 * restart the rename. This acquire/release step ensures that we do not 844 * spin on a lock waiting for release. On error release all vnode locks 845 * and decrement references the way tmpfs_rename() would do. 846 */ 847static int 848tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 849 struct vnode *tdvp, struct vnode **tvpp, 850 struct componentname *fcnp, struct componentname *tcnp) 851{ 852 struct vnode *nvp; 853 struct mount *mp; 854 struct tmpfs_dirent *de; 855 int error, restarts = 0; 856 857 VOP_UNLOCK(tdvp, 0); 858 if (*tvpp != NULL && *tvpp != tdvp) 859 VOP_UNLOCK(*tvpp, 0); 860 mp = fdvp->v_mount; 861 862relock: 863 restarts += 1; 864 error = vn_lock(fdvp, LK_EXCLUSIVE); 865 if (error) 866 goto releout; 867 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 868 VOP_UNLOCK(fdvp, 0); 869 error = vn_lock(tdvp, LK_EXCLUSIVE); 870 if (error) 871 goto releout; 872 VOP_UNLOCK(tdvp, 0); 873 goto relock; 874 } 875 /* 876 * Re-resolve fvp to be certain it still exists and fetch the 877 * correct vnode. 878 */ 879 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 880 if (de == NULL) { 881 VOP_UNLOCK(fdvp, 0); 882 VOP_UNLOCK(tdvp, 0); 883 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 884 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 885 error = EINVAL; 886 else 887 error = ENOENT; 888 goto releout; 889 } 890 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 891 if (error != 0) { 892 VOP_UNLOCK(fdvp, 0); 893 VOP_UNLOCK(tdvp, 0); 894 if (error != EBUSY) 895 goto releout; 896 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 897 if (error != 0) 898 goto releout; 899 VOP_UNLOCK(nvp, 0); 900 /* 901 * Concurrent rename race. 902 */ 903 if (nvp == tdvp) { 904 vrele(nvp); 905 error = EINVAL; 906 goto releout; 907 } 908 vrele(*fvpp); 909 *fvpp = nvp; 910 goto relock; 911 } 912 vrele(*fvpp); 913 *fvpp = nvp; 914 VOP_UNLOCK(*fvpp, 0); 915 /* 916 * Re-resolve tvp and acquire the vnode lock if present. 917 */ 918 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 919 /* 920 * If tvp disappeared we just carry on. 921 */ 922 if (de == NULL && *tvpp != NULL) { 923 vrele(*tvpp); 924 *tvpp = NULL; 925 } 926 /* 927 * Get the tvp ino if the lookup succeeded. We may have to restart 928 * if the non-blocking acquire fails. 929 */ 930 if (de != NULL) { 931 nvp = NULL; 932 error = tmpfs_alloc_vp(mp, de->td_node, 933 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 934 if (*tvpp != NULL) 935 vrele(*tvpp); 936 *tvpp = nvp; 937 if (error != 0) { 938 VOP_UNLOCK(fdvp, 0); 939 VOP_UNLOCK(tdvp, 0); 940 if (error != EBUSY) 941 goto releout; 942 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 943 &nvp); 944 if (error != 0) 945 goto releout; 946 VOP_UNLOCK(nvp, 0); 947 /* 948 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 949 */ 950 if (nvp == fdvp) { 951 error = ENOTEMPTY; 952 goto releout; 953 } 954 goto relock; 955 } 956 } 957 tmpfs_rename_restarts += restarts; 958 959 return (0); 960 961releout: 962 vrele(fdvp); 963 vrele(*fvpp); 964 vrele(tdvp); 965 if (*tvpp != NULL) 966 vrele(*tvpp); 967 tmpfs_rename_restarts += restarts; 968 969 return (error); 970} 971 972static int 973tmpfs_rename(struct vop_rename_args *v) 974{ 975 struct vnode *fdvp = v->a_fdvp; 976 struct vnode *fvp = v->a_fvp; 977 struct componentname *fcnp = v->a_fcnp; 978 struct vnode *tdvp = v->a_tdvp; 979 struct vnode *tvp = v->a_tvp; 980 struct componentname *tcnp = v->a_tcnp; 981 struct mount *mp = NULL; 982 983 char *newname; 984 int error; 985 struct tmpfs_dirent *de; 986 struct tmpfs_mount *tmp; 987 struct tmpfs_node *fdnode; 988 struct tmpfs_node *fnode; 989 struct tmpfs_node *tnode; 990 struct tmpfs_node *tdnode; 991 992 MPASS(VOP_ISLOCKED(tdvp)); 993 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 994 MPASS(fcnp->cn_flags & HASBUF); 995 MPASS(tcnp->cn_flags & HASBUF); 996 997 /* Disallow cross-device renames. 998 * XXX Why isn't this done by the caller? */ 999 if (fvp->v_mount != tdvp->v_mount || 1000 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1001 error = EXDEV; 1002 goto out; 1003 } 1004 1005 /* If source and target are the same file, there is nothing to do. */ 1006 if (fvp == tvp) { 1007 error = 0; 1008 goto out; 1009 } 1010 1011 /* If we need to move the directory between entries, lock the 1012 * source so that we can safely operate on it. */ 1013 if (fdvp != tdvp && fdvp != tvp) { 1014 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1015 mp = tdvp->v_mount; 1016 error = vfs_busy(mp, 0); 1017 if (error != 0) { 1018 mp = NULL; 1019 goto out; 1020 } 1021 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1022 fcnp, tcnp); 1023 if (error != 0) { 1024 vfs_unbusy(mp); 1025 return (error); 1026 } 1027 ASSERT_VOP_ELOCKED(fdvp, 1028 "tmpfs_rename: fdvp not locked"); 1029 ASSERT_VOP_ELOCKED(tdvp, 1030 "tmpfs_rename: tdvp not locked"); 1031 if (tvp != NULL) 1032 ASSERT_VOP_ELOCKED(tvp, 1033 "tmpfs_rename: tvp not locked"); 1034 if (fvp == tvp) { 1035 error = 0; 1036 goto out_locked; 1037 } 1038 } 1039 } 1040 1041 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1042 tdnode = VP_TO_TMPFS_DIR(tdvp); 1043 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1044 fdnode = VP_TO_TMPFS_DIR(fdvp); 1045 fnode = VP_TO_TMPFS_NODE(fvp); 1046 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1047 1048 /* Entry can disappear before we lock fdvp, 1049 * also avoid manipulating '.' and '..' entries. */ 1050 if (de == NULL) { 1051 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1052 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1053 error = EINVAL; 1054 else 1055 error = ENOENT; 1056 goto out_locked; 1057 } 1058 MPASS(de->td_node == fnode); 1059 1060 /* If re-naming a directory to another preexisting directory 1061 * ensure that the target directory is empty so that its 1062 * removal causes no side effects. 1063 * Kern_rename gurantees the destination to be a directory 1064 * if the source is one. */ 1065 if (tvp != NULL) { 1066 MPASS(tnode != NULL); 1067 1068 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1069 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1070 error = EPERM; 1071 goto out_locked; 1072 } 1073 1074 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1075 if (tnode->tn_size > 0) { 1076 error = ENOTEMPTY; 1077 goto out_locked; 1078 } 1079 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1080 error = ENOTDIR; 1081 goto out_locked; 1082 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1083 error = EISDIR; 1084 goto out_locked; 1085 } else { 1086 MPASS(fnode->tn_type != VDIR && 1087 tnode->tn_type != VDIR); 1088 } 1089 } 1090 1091 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1092 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1093 error = EPERM; 1094 goto out_locked; 1095 } 1096 1097 /* Ensure that we have enough memory to hold the new name, if it 1098 * has to be changed. */ 1099 if (fcnp->cn_namelen != tcnp->cn_namelen || 1100 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1101 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1102 } else 1103 newname = NULL; 1104 1105 /* If the node is being moved to another directory, we have to do 1106 * the move. */ 1107 if (fdnode != tdnode) { 1108 /* In case we are moving a directory, we have to adjust its 1109 * parent to point to the new parent. */ 1110 if (de->td_node->tn_type == VDIR) { 1111 struct tmpfs_node *n; 1112 1113 /* Ensure the target directory is not a child of the 1114 * directory being moved. Otherwise, we'd end up 1115 * with stale nodes. */ 1116 n = tdnode; 1117 /* TMPFS_LOCK garanties that no nodes are freed while 1118 * traversing the list. Nodes can only be marked as 1119 * removed: tn_parent == NULL. */ 1120 TMPFS_LOCK(tmp); 1121 TMPFS_NODE_LOCK(n); 1122 while (n != n->tn_dir.tn_parent) { 1123 struct tmpfs_node *parent; 1124 1125 if (n == fnode) { 1126 TMPFS_NODE_UNLOCK(n); 1127 TMPFS_UNLOCK(tmp); 1128 error = EINVAL; 1129 if (newname != NULL) 1130 free(newname, M_TMPFSNAME); 1131 goto out_locked; 1132 } 1133 parent = n->tn_dir.tn_parent; 1134 TMPFS_NODE_UNLOCK(n); 1135 if (parent == NULL) { 1136 n = NULL; 1137 break; 1138 } 1139 TMPFS_NODE_LOCK(parent); 1140 if (parent->tn_dir.tn_parent == NULL) { 1141 TMPFS_NODE_UNLOCK(parent); 1142 n = NULL; 1143 break; 1144 } 1145 n = parent; 1146 } 1147 TMPFS_UNLOCK(tmp); 1148 if (n == NULL) { 1149 error = EINVAL; 1150 if (newname != NULL) 1151 free(newname, M_TMPFSNAME); 1152 goto out_locked; 1153 } 1154 TMPFS_NODE_UNLOCK(n); 1155 1156 /* Adjust the parent pointer. */ 1157 TMPFS_VALIDATE_DIR(fnode); 1158 TMPFS_NODE_LOCK(de->td_node); 1159 de->td_node->tn_dir.tn_parent = tdnode; 1160 TMPFS_NODE_UNLOCK(de->td_node); 1161 1162 /* As a result of changing the target of the '..' 1163 * entry, the link count of the source and target 1164 * directories has to be adjusted. */ 1165 TMPFS_NODE_LOCK(tdnode); 1166 TMPFS_ASSERT_LOCKED(tdnode); 1167 tdnode->tn_links++; 1168 TMPFS_NODE_UNLOCK(tdnode); 1169 1170 TMPFS_NODE_LOCK(fdnode); 1171 TMPFS_ASSERT_LOCKED(fdnode); 1172 fdnode->tn_links--; 1173 TMPFS_NODE_UNLOCK(fdnode); 1174 } 1175 } 1176 1177 /* Do the move: just remove the entry from the source directory 1178 * and insert it into the target one. */ 1179 tmpfs_dir_detach(fdvp, de); 1180 1181 if (fcnp->cn_flags & DOWHITEOUT) 1182 tmpfs_dir_whiteout_add(fdvp, fcnp); 1183 if (tcnp->cn_flags & ISWHITEOUT) 1184 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1185 1186 /* If the name has changed, we need to make it effective by changing 1187 * it in the directory entry. */ 1188 if (newname != NULL) { 1189 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1190 1191 free(de->ud.td_name, M_TMPFSNAME); 1192 de->ud.td_name = newname; 1193 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1194 1195 fnode->tn_status |= TMPFS_NODE_CHANGED; 1196 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1197 } 1198 1199 /* If we are overwriting an entry, we have to remove the old one 1200 * from the target directory. */ 1201 if (tvp != NULL) { 1202 struct tmpfs_dirent *tde; 1203 1204 /* Remove the old entry from the target directory. */ 1205 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1206 tmpfs_dir_detach(tdvp, tde); 1207 1208 /* Free the directory entry we just deleted. Note that the 1209 * node referred by it will not be removed until the vnode is 1210 * really reclaimed. */ 1211 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1212 } 1213 1214 tmpfs_dir_attach(tdvp, de); 1215 1216 cache_purge(fvp); 1217 if (tvp != NULL) 1218 cache_purge(tvp); 1219 cache_purge_negative(tdvp); 1220 1221 error = 0; 1222 1223out_locked: 1224 if (fdvp != tdvp && fdvp != tvp) 1225 VOP_UNLOCK(fdvp, 0); 1226 1227out: 1228 /* Release target nodes. */ 1229 /* XXX: I don't understand when tdvp can be the same as tvp, but 1230 * other code takes care of this... */ 1231 if (tdvp == tvp) 1232 vrele(tdvp); 1233 else 1234 vput(tdvp); 1235 if (tvp != NULL) 1236 vput(tvp); 1237 1238 /* Release source nodes. */ 1239 vrele(fdvp); 1240 vrele(fvp); 1241 1242 if (mp != NULL) 1243 vfs_unbusy(mp); 1244 1245 return error; 1246} 1247 1248/* --------------------------------------------------------------------- */ 1249 1250static int 1251tmpfs_mkdir(struct vop_mkdir_args *v) 1252{ 1253 struct vnode *dvp = v->a_dvp; 1254 struct vnode **vpp = v->a_vpp; 1255 struct componentname *cnp = v->a_cnp; 1256 struct vattr *vap = v->a_vap; 1257 1258 MPASS(vap->va_type == VDIR); 1259 1260 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1261} 1262 1263/* --------------------------------------------------------------------- */ 1264 1265static int 1266tmpfs_rmdir(struct vop_rmdir_args *v) 1267{ 1268 struct vnode *dvp = v->a_dvp; 1269 struct vnode *vp = v->a_vp; 1270 1271 int error; 1272 struct tmpfs_dirent *de; 1273 struct tmpfs_mount *tmp; 1274 struct tmpfs_node *dnode; 1275 struct tmpfs_node *node; 1276 1277 MPASS(VOP_ISLOCKED(dvp)); 1278 MPASS(VOP_ISLOCKED(vp)); 1279 1280 tmp = VFS_TO_TMPFS(dvp->v_mount); 1281 dnode = VP_TO_TMPFS_DIR(dvp); 1282 node = VP_TO_TMPFS_DIR(vp); 1283 1284 /* Directories with more than two entries ('.' and '..') cannot be 1285 * removed. */ 1286 if (node->tn_size > 0) { 1287 error = ENOTEMPTY; 1288 goto out; 1289 } 1290 1291 if ((dnode->tn_flags & APPEND) 1292 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1293 error = EPERM; 1294 goto out; 1295 } 1296 1297 /* This invariant holds only if we are not trying to remove "..". 1298 * We checked for that above so this is safe now. */ 1299 MPASS(node->tn_dir.tn_parent == dnode); 1300 1301 /* Get the directory entry associated with node (vp). This was 1302 * filled by tmpfs_lookup while looking up the entry. */ 1303 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1304 MPASS(TMPFS_DIRENT_MATCHES(de, 1305 v->a_cnp->cn_nameptr, 1306 v->a_cnp->cn_namelen)); 1307 1308 /* Check flags to see if we are allowed to remove the directory. */ 1309 if (dnode->tn_flags & APPEND 1310 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1311 error = EPERM; 1312 goto out; 1313 } 1314 1315 1316 /* Detach the directory entry from the directory (dnode). */ 1317 tmpfs_dir_detach(dvp, de); 1318 if (v->a_cnp->cn_flags & DOWHITEOUT) 1319 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1320 1321 /* No vnode should be allocated for this entry from this point */ 1322 TMPFS_NODE_LOCK(node); 1323 TMPFS_ASSERT_ELOCKED(node); 1324 node->tn_links--; 1325 node->tn_dir.tn_parent = NULL; 1326 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1327 TMPFS_NODE_MODIFIED; 1328 1329 TMPFS_NODE_UNLOCK(node); 1330 1331 TMPFS_NODE_LOCK(dnode); 1332 TMPFS_ASSERT_ELOCKED(dnode); 1333 dnode->tn_links--; 1334 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1335 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1336 TMPFS_NODE_UNLOCK(dnode); 1337 1338 cache_purge(dvp); 1339 cache_purge(vp); 1340 1341 /* Free the directory entry we just deleted. Note that the node 1342 * referred by it will not be removed until the vnode is really 1343 * reclaimed. */ 1344 tmpfs_free_dirent(tmp, de); 1345 1346 /* Release the deleted vnode (will destroy the node, notify 1347 * interested parties and clean it from the cache). */ 1348 1349 dnode->tn_status |= TMPFS_NODE_CHANGED; 1350 tmpfs_update(dvp); 1351 1352 error = 0; 1353 1354out: 1355 return error; 1356} 1357 1358/* --------------------------------------------------------------------- */ 1359 1360static int 1361tmpfs_symlink(struct vop_symlink_args *v) 1362{ 1363 struct vnode *dvp = v->a_dvp; 1364 struct vnode **vpp = v->a_vpp; 1365 struct componentname *cnp = v->a_cnp; 1366 struct vattr *vap = v->a_vap; 1367 char *target = v->a_target; 1368 1369#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1370 MPASS(vap->va_type == VLNK); 1371#else 1372 vap->va_type = VLNK; 1373#endif 1374 1375 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1376} 1377 1378/* --------------------------------------------------------------------- */ 1379 1380static int 1381tmpfs_readdir(struct vop_readdir_args *v) 1382{ 1383 struct vnode *vp = v->a_vp; 1384 struct uio *uio = v->a_uio; 1385 int *eofflag = v->a_eofflag; 1386 u_long **cookies = v->a_cookies; 1387 int *ncookies = v->a_ncookies; 1388 1389 int error; 1390 ssize_t startresid; 1391 int cnt = 0; 1392 struct tmpfs_node *node; 1393 1394 /* This operation only makes sense on directory nodes. */ 1395 if (vp->v_type != VDIR) 1396 return ENOTDIR; 1397 1398 node = VP_TO_TMPFS_DIR(vp); 1399 1400 startresid = uio->uio_resid; 1401 1402 if (cookies != NULL && ncookies != NULL) { 1403 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1404 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1405 *ncookies = 0; 1406 } 1407 1408 if (cnt == 0) 1409 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1410 else 1411 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1412 1413 if (error == EJUSTRETURN) 1414 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1415 1416 if (error != 0 && cnt != 0) 1417 free(*cookies, M_TEMP); 1418 1419 if (eofflag != NULL) 1420 *eofflag = 1421 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1422 1423 return error; 1424} 1425 1426/* --------------------------------------------------------------------- */ 1427 1428static int 1429tmpfs_readlink(struct vop_readlink_args *v) 1430{ 1431 struct vnode *vp = v->a_vp; 1432 struct uio *uio = v->a_uio; 1433 1434 int error; 1435 struct tmpfs_node *node; 1436 1437 MPASS(uio->uio_offset == 0); 1438 MPASS(vp->v_type == VLNK); 1439 1440 node = VP_TO_TMPFS_NODE(vp); 1441 1442 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1443 uio); 1444 node->tn_status |= TMPFS_NODE_ACCESSED; 1445 1446 return error; 1447} 1448 1449/* --------------------------------------------------------------------- */ 1450 1451static int 1452tmpfs_inactive(struct vop_inactive_args *v) 1453{ 1454 struct vnode *vp = v->a_vp; 1455 1456 struct tmpfs_node *node; 1457 1458 node = VP_TO_TMPFS_NODE(vp); 1459 1460 if (node->tn_links == 0) 1461 vrecycle(vp); 1462 1463 return 0; 1464} 1465 1466/* --------------------------------------------------------------------- */ 1467 1468int 1469tmpfs_reclaim(struct vop_reclaim_args *v) 1470{ 1471 struct vnode *vp = v->a_vp; 1472 1473 struct tmpfs_mount *tmp; 1474 struct tmpfs_node *node; 1475 1476 node = VP_TO_TMPFS_NODE(vp); 1477 tmp = VFS_TO_TMPFS(vp->v_mount); 1478 1479 if (vp->v_type == VREG) 1480 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1481 else 1482 vnode_destroy_vobject(vp); 1483 vp->v_object = NULL; 1484 cache_purge(vp); 1485 1486 TMPFS_NODE_LOCK(node); 1487 TMPFS_ASSERT_ELOCKED(node); 1488 tmpfs_free_vp(vp); 1489 1490 /* If the node referenced by this vnode was deleted by the user, 1491 * we must free its associated data structures (now that the vnode 1492 * is being reclaimed). */ 1493 if (node->tn_links == 0 && 1494 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1495 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1496 TMPFS_NODE_UNLOCK(node); 1497 tmpfs_free_node(tmp, node); 1498 } else 1499 TMPFS_NODE_UNLOCK(node); 1500 1501 MPASS(vp->v_data == NULL); 1502 return 0; 1503} 1504 1505/* --------------------------------------------------------------------- */ 1506 1507static int 1508tmpfs_print(struct vop_print_args *v) 1509{ 1510 struct vnode *vp = v->a_vp; 1511 1512 struct tmpfs_node *node; 1513 1514 node = VP_TO_TMPFS_NODE(vp); 1515 1516 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1517 node, node->tn_flags, node->tn_links); 1518 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1519 node->tn_mode, node->tn_uid, node->tn_gid, 1520 (intmax_t)node->tn_size, node->tn_status); 1521 1522 if (vp->v_type == VFIFO) 1523 fifo_printinfo(vp); 1524 1525 printf("\n"); 1526 1527 return 0; 1528} 1529 1530/* --------------------------------------------------------------------- */ 1531 1532static int 1533tmpfs_pathconf(struct vop_pathconf_args *v) 1534{ 1535 int name = v->a_name; 1536 register_t *retval = v->a_retval; 1537 1538 int error; 1539 1540 error = 0; 1541 1542 switch (name) { 1543 case _PC_LINK_MAX: 1544 *retval = LINK_MAX; 1545 break; 1546 1547 case _PC_NAME_MAX: 1548 *retval = NAME_MAX; 1549 break; 1550 1551 case _PC_PATH_MAX: 1552 *retval = PATH_MAX; 1553 break; 1554 1555 case _PC_PIPE_BUF: 1556 *retval = PIPE_BUF; 1557 break; 1558 1559 case _PC_CHOWN_RESTRICTED: 1560 *retval = 1; 1561 break; 1562 1563 case _PC_NO_TRUNC: 1564 *retval = 1; 1565 break; 1566 1567 case _PC_SYNC_IO: 1568 *retval = 1; 1569 break; 1570 1571 case _PC_FILESIZEBITS: 1572 *retval = 0; /* XXX Don't know which value should I return. */ 1573 break; 1574 1575 default: 1576 error = EINVAL; 1577 } 1578 1579 return error; 1580} 1581 1582static int 1583tmpfs_vptofh(struct vop_vptofh_args *ap) 1584{ 1585 struct tmpfs_fid *tfhp; 1586 struct tmpfs_node *node; 1587 1588 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1589 node = VP_TO_TMPFS_NODE(ap->a_vp); 1590 1591 tfhp->tf_len = sizeof(struct tmpfs_fid); 1592 tfhp->tf_id = node->tn_id; 1593 tfhp->tf_gen = node->tn_gen; 1594 1595 return (0); 1596} 1597 1598static int 1599tmpfs_whiteout(struct vop_whiteout_args *ap) 1600{ 1601 struct vnode *dvp = ap->a_dvp; 1602 struct componentname *cnp = ap->a_cnp; 1603 struct tmpfs_dirent *de; 1604 1605 switch (ap->a_flags) { 1606 case LOOKUP: 1607 return (0); 1608 case CREATE: 1609 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1610 if (de != NULL) 1611 return (de->td_node == NULL ? 0 : EEXIST); 1612 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1613 case DELETE: 1614 tmpfs_dir_whiteout_remove(dvp, cnp); 1615 return (0); 1616 default: 1617 panic("tmpfs_whiteout: unknown op"); 1618 } 1619} 1620 1621/* --------------------------------------------------------------------- */ 1622 1623/* 1624 * vnode operations vector used for files stored in a tmpfs file system. 1625 */ 1626struct vop_vector tmpfs_vnodeop_entries = { 1627 .vop_default = &default_vnodeops, 1628 .vop_lookup = vfs_cache_lookup, 1629 .vop_cachedlookup = tmpfs_lookup, 1630 .vop_create = tmpfs_create, 1631 .vop_mknod = tmpfs_mknod, 1632 .vop_open = tmpfs_open, 1633 .vop_close = tmpfs_close, 1634 .vop_access = tmpfs_access, 1635 .vop_getattr = tmpfs_getattr, 1636 .vop_setattr = tmpfs_setattr, 1637 .vop_read = tmpfs_read, 1638 .vop_write = tmpfs_write, 1639 .vop_fsync = tmpfs_fsync, 1640 .vop_remove = tmpfs_remove, 1641 .vop_link = tmpfs_link, 1642 .vop_rename = tmpfs_rename, 1643 .vop_mkdir = tmpfs_mkdir, 1644 .vop_rmdir = tmpfs_rmdir, 1645 .vop_symlink = tmpfs_symlink, 1646 .vop_readdir = tmpfs_readdir, 1647 .vop_readlink = tmpfs_readlink, 1648 .vop_inactive = tmpfs_inactive, 1649 .vop_reclaim = tmpfs_reclaim, 1650 .vop_print = tmpfs_print, 1651 .vop_pathconf = tmpfs_pathconf, 1652 .vop_vptofh = tmpfs_vptofh, 1653 .vop_whiteout = tmpfs_whiteout, 1654 .vop_bmap = VOP_EOPNOTSUPP, 1655}; 1656 1657