tmpfs_vnops.c revision 251505
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 251505 2013-06-07 19:42:00Z alc $"); 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 | VM_ALLOC_NOBUSY); 464 if (m->valid != VM_PAGE_BITS_ALL) { 465 vm_page_busy(m); 466 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 467 rv = vm_pager_get_pages(tobj, &m, 1, 0); 468 m = vm_page_lookup(tobj, idx); 469 if (m == NULL) { 470 printf( 471 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 472 tobj, idx, rv); 473 VM_OBJECT_WUNLOCK(tobj); 474 return (EIO); 475 } 476 if (rv != VM_PAGER_OK) { 477 printf( 478 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 479 tobj, idx, m->valid, rv); 480 vm_page_lock(m); 481 vm_page_free(m); 482 vm_page_unlock(m); 483 VM_OBJECT_WUNLOCK(tobj); 484 return (EIO); 485 } 486 } else 487 vm_page_zero_invalid(m, TRUE); 488 vm_page_wakeup(m); 489 } 490 vm_page_lock(m); 491 vm_page_hold(m); 492 vm_page_unlock(m); 493 VM_OBJECT_WUNLOCK(tobj); 494 error = uiomove_fromphys(&m, offset, tlen, uio); 495 vm_page_lock(m); 496 vm_page_unhold(m); 497 if (m->queue == PQ_NONE) { 498 vm_page_deactivate(m); 499 } else { 500 /* Requeue to maintain LRU ordering. */ 501 vm_page_requeue(m); 502 } 503 vm_page_unlock(m); 504 505 return (error); 506} 507 508static int 509tmpfs_read(struct vop_read_args *v) 510{ 511 struct vnode *vp = v->a_vp; 512 struct uio *uio = v->a_uio; 513 struct tmpfs_node *node; 514 vm_object_t uobj; 515 size_t len; 516 int resid; 517 int error = 0; 518 vm_pindex_t idx; 519 vm_offset_t offset; 520 off_t addr; 521 size_t tlen; 522 523 node = VP_TO_TMPFS_NODE(vp); 524 525 if (vp->v_type != VREG) { 526 error = EISDIR; 527 goto out; 528 } 529 530 if (uio->uio_offset < 0) { 531 error = EINVAL; 532 goto out; 533 } 534 535 node->tn_status |= TMPFS_NODE_ACCESSED; 536 537 uobj = node->tn_reg.tn_aobj; 538 while ((resid = uio->uio_resid) > 0) { 539 error = 0; 540 if (node->tn_size <= uio->uio_offset) 541 break; 542 len = MIN(node->tn_size - uio->uio_offset, resid); 543 if (len == 0) 544 break; 545 addr = uio->uio_offset; 546 idx = OFF_TO_IDX(addr); 547 offset = addr & PAGE_MASK; 548 tlen = MIN(PAGE_SIZE - offset, len); 549 error = tmpfs_nocacheread(uobj, idx, offset, tlen, uio); 550 if ((error != 0) || (resid == uio->uio_resid)) 551 break; 552 } 553 554out: 555 556 return error; 557} 558 559/* --------------------------------------------------------------------- */ 560 561static int 562tmpfs_mappedwrite(vm_object_t tobj, size_t len, struct uio *uio) 563{ 564 vm_pindex_t idx; 565 vm_page_t tpg; 566 vm_offset_t offset; 567 off_t addr; 568 size_t tlen; 569 int error, rv; 570 571 error = 0; 572 573 addr = uio->uio_offset; 574 idx = OFF_TO_IDX(addr); 575 offset = addr & PAGE_MASK; 576 tlen = MIN(PAGE_SIZE - offset, len); 577 578 VM_OBJECT_WLOCK(tobj); 579 tpg = vm_page_grab(tobj, idx, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY | 580 VM_ALLOC_RETRY); 581 if (tpg->valid != VM_PAGE_BITS_ALL) { 582 vm_page_busy(tpg); 583 if (vm_pager_has_page(tobj, idx, NULL, NULL)) { 584 rv = vm_pager_get_pages(tobj, &tpg, 1, 0); 585 tpg = vm_page_lookup(tobj, idx); 586 if (tpg == NULL) { 587 printf( 588 "tmpfs: vm_obj %p idx %jd null lookup rv %d\n", 589 tobj, idx, rv); 590 VM_OBJECT_WUNLOCK(tobj); 591 return (EIO); 592 } 593 if (rv != VM_PAGER_OK) { 594 printf( 595 "tmpfs: vm_obj %p idx %jd valid %x pager error %d\n", 596 tobj, idx, tpg->valid, rv); 597 vm_page_lock(tpg); 598 vm_page_free(tpg); 599 vm_page_unlock(tpg); 600 VM_OBJECT_WUNLOCK(tobj); 601 return (EIO); 602 } 603 } else 604 vm_page_zero_invalid(tpg, TRUE); 605 vm_page_wakeup(tpg); 606 } 607 vm_page_lock(tpg); 608 vm_page_hold(tpg); 609 vm_page_unlock(tpg); 610 VM_OBJECT_WUNLOCK(tobj); 611 error = uiomove_fromphys(&tpg, offset, tlen, uio); 612 VM_OBJECT_WLOCK(tobj); 613 if (error == 0) 614 vm_page_dirty(tpg); 615 vm_page_lock(tpg); 616 vm_page_unhold(tpg); 617 if (tpg->queue == PQ_NONE) { 618 vm_page_deactivate(tpg); 619 } else { 620 /* Requeue to maintain LRU ordering. */ 621 vm_page_requeue(tpg); 622 } 623 vm_page_unlock(tpg); 624 VM_OBJECT_WUNLOCK(tobj); 625 626 return (error); 627} 628 629static int 630tmpfs_write(struct vop_write_args *v) 631{ 632 struct vnode *vp = v->a_vp; 633 struct uio *uio = v->a_uio; 634 int ioflag = v->a_ioflag; 635 636 boolean_t extended; 637 int error = 0; 638 off_t oldsize; 639 struct tmpfs_node *node; 640 vm_object_t uobj; 641 size_t len; 642 int resid; 643 644 node = VP_TO_TMPFS_NODE(vp); 645 oldsize = node->tn_size; 646 647 if (uio->uio_offset < 0 || vp->v_type != VREG) { 648 error = EINVAL; 649 goto out; 650 } 651 652 if (uio->uio_resid == 0) { 653 error = 0; 654 goto out; 655 } 656 657 if (ioflag & IO_APPEND) 658 uio->uio_offset = node->tn_size; 659 660 if (uio->uio_offset + uio->uio_resid > 661 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 662 return (EFBIG); 663 664 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 665 return (EFBIG); 666 667 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 668 if (extended) { 669 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 670 FALSE); 671 if (error != 0) 672 goto out; 673 } 674 675 uobj = node->tn_reg.tn_aobj; 676 while ((resid = uio->uio_resid) > 0) { 677 if (node->tn_size <= uio->uio_offset) 678 break; 679 len = MIN(node->tn_size - uio->uio_offset, resid); 680 if (len == 0) 681 break; 682 error = tmpfs_mappedwrite(uobj, len, uio); 683 if ((error != 0) || (resid == uio->uio_resid)) 684 break; 685 } 686 687 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 688 (extended ? TMPFS_NODE_CHANGED : 0); 689 690 if (node->tn_mode & (S_ISUID | S_ISGID)) { 691 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 692 node->tn_mode &= ~(S_ISUID | S_ISGID); 693 } 694 695 if (error != 0) 696 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 697 698out: 699 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 700 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 701 702 return error; 703} 704 705/* --------------------------------------------------------------------- */ 706 707static int 708tmpfs_fsync(struct vop_fsync_args *v) 709{ 710 struct vnode *vp = v->a_vp; 711 712 MPASS(VOP_ISLOCKED(vp)); 713 714 tmpfs_update(vp); 715 716 return 0; 717} 718 719/* --------------------------------------------------------------------- */ 720 721static int 722tmpfs_remove(struct vop_remove_args *v) 723{ 724 struct vnode *dvp = v->a_dvp; 725 struct vnode *vp = v->a_vp; 726 727 int error; 728 struct tmpfs_dirent *de; 729 struct tmpfs_mount *tmp; 730 struct tmpfs_node *dnode; 731 struct tmpfs_node *node; 732 733 MPASS(VOP_ISLOCKED(dvp)); 734 MPASS(VOP_ISLOCKED(vp)); 735 736 if (vp->v_type == VDIR) { 737 error = EISDIR; 738 goto out; 739 } 740 741 dnode = VP_TO_TMPFS_DIR(dvp); 742 node = VP_TO_TMPFS_NODE(vp); 743 tmp = VFS_TO_TMPFS(vp->v_mount); 744 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 745 MPASS(de != NULL); 746 747 /* Files marked as immutable or append-only cannot be deleted. */ 748 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 749 (dnode->tn_flags & APPEND)) { 750 error = EPERM; 751 goto out; 752 } 753 754 /* Remove the entry from the directory; as it is a file, we do not 755 * have to change the number of hard links of the directory. */ 756 tmpfs_dir_detach(dvp, de); 757 if (v->a_cnp->cn_flags & DOWHITEOUT) 758 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 759 760 /* Free the directory entry we just deleted. Note that the node 761 * referred by it will not be removed until the vnode is really 762 * reclaimed. */ 763 tmpfs_free_dirent(tmp, de); 764 765 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 766 error = 0; 767 768out: 769 770 return error; 771} 772 773/* --------------------------------------------------------------------- */ 774 775static int 776tmpfs_link(struct vop_link_args *v) 777{ 778 struct vnode *dvp = v->a_tdvp; 779 struct vnode *vp = v->a_vp; 780 struct componentname *cnp = v->a_cnp; 781 782 int error; 783 struct tmpfs_dirent *de; 784 struct tmpfs_node *node; 785 786 MPASS(VOP_ISLOCKED(dvp)); 787 MPASS(cnp->cn_flags & HASBUF); 788 MPASS(dvp != vp); /* XXX When can this be false? */ 789 790 node = VP_TO_TMPFS_NODE(vp); 791 792 /* XXX: Why aren't the following two tests done by the caller? */ 793 794 /* Hard links of directories are forbidden. */ 795 if (vp->v_type == VDIR) { 796 error = EPERM; 797 goto out; 798 } 799 800 /* Cannot create cross-device links. */ 801 if (dvp->v_mount != vp->v_mount) { 802 error = EXDEV; 803 goto out; 804 } 805 806 /* Ensure that we do not overflow the maximum number of links imposed 807 * by the system. */ 808 MPASS(node->tn_links <= LINK_MAX); 809 if (node->tn_links == LINK_MAX) { 810 error = EMLINK; 811 goto out; 812 } 813 814 /* We cannot create links of files marked immutable or append-only. */ 815 if (node->tn_flags & (IMMUTABLE | APPEND)) { 816 error = EPERM; 817 goto out; 818 } 819 820 /* Allocate a new directory entry to represent the node. */ 821 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 822 cnp->cn_nameptr, cnp->cn_namelen, &de); 823 if (error != 0) 824 goto out; 825 826 /* Insert the new directory entry into the appropriate directory. */ 827 if (cnp->cn_flags & ISWHITEOUT) 828 tmpfs_dir_whiteout_remove(dvp, cnp); 829 tmpfs_dir_attach(dvp, de); 830 831 /* vp link count has changed, so update node times. */ 832 node->tn_status |= TMPFS_NODE_CHANGED; 833 tmpfs_update(vp); 834 835 error = 0; 836 837out: 838 return error; 839} 840 841/* --------------------------------------------------------------------- */ 842 843/* 844 * We acquire all but fdvp locks using non-blocking acquisitions. If we 845 * fail to acquire any lock in the path we will drop all held locks, 846 * acquire the new lock in a blocking fashion, and then release it and 847 * restart the rename. This acquire/release step ensures that we do not 848 * spin on a lock waiting for release. On error release all vnode locks 849 * and decrement references the way tmpfs_rename() would do. 850 */ 851static int 852tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 853 struct vnode *tdvp, struct vnode **tvpp, 854 struct componentname *fcnp, struct componentname *tcnp) 855{ 856 struct vnode *nvp; 857 struct mount *mp; 858 struct tmpfs_dirent *de; 859 int error, restarts = 0; 860 861 VOP_UNLOCK(tdvp, 0); 862 if (*tvpp != NULL && *tvpp != tdvp) 863 VOP_UNLOCK(*tvpp, 0); 864 mp = fdvp->v_mount; 865 866relock: 867 restarts += 1; 868 error = vn_lock(fdvp, LK_EXCLUSIVE); 869 if (error) 870 goto releout; 871 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 872 VOP_UNLOCK(fdvp, 0); 873 error = vn_lock(tdvp, LK_EXCLUSIVE); 874 if (error) 875 goto releout; 876 VOP_UNLOCK(tdvp, 0); 877 goto relock; 878 } 879 /* 880 * Re-resolve fvp to be certain it still exists and fetch the 881 * correct vnode. 882 */ 883 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 884 if (de == NULL) { 885 VOP_UNLOCK(fdvp, 0); 886 VOP_UNLOCK(tdvp, 0); 887 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 888 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 889 error = EINVAL; 890 else 891 error = ENOENT; 892 goto releout; 893 } 894 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 895 if (error != 0) { 896 VOP_UNLOCK(fdvp, 0); 897 VOP_UNLOCK(tdvp, 0); 898 if (error != EBUSY) 899 goto releout; 900 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 901 if (error != 0) 902 goto releout; 903 VOP_UNLOCK(nvp, 0); 904 /* 905 * Concurrent rename race. 906 */ 907 if (nvp == tdvp) { 908 vrele(nvp); 909 error = EINVAL; 910 goto releout; 911 } 912 vrele(*fvpp); 913 *fvpp = nvp; 914 goto relock; 915 } 916 vrele(*fvpp); 917 *fvpp = nvp; 918 VOP_UNLOCK(*fvpp, 0); 919 /* 920 * Re-resolve tvp and acquire the vnode lock if present. 921 */ 922 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 923 /* 924 * If tvp disappeared we just carry on. 925 */ 926 if (de == NULL && *tvpp != NULL) { 927 vrele(*tvpp); 928 *tvpp = NULL; 929 } 930 /* 931 * Get the tvp ino if the lookup succeeded. We may have to restart 932 * if the non-blocking acquire fails. 933 */ 934 if (de != NULL) { 935 nvp = NULL; 936 error = tmpfs_alloc_vp(mp, de->td_node, 937 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 938 if (*tvpp != NULL) 939 vrele(*tvpp); 940 *tvpp = nvp; 941 if (error != 0) { 942 VOP_UNLOCK(fdvp, 0); 943 VOP_UNLOCK(tdvp, 0); 944 if (error != EBUSY) 945 goto releout; 946 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 947 &nvp); 948 if (error != 0) 949 goto releout; 950 VOP_UNLOCK(nvp, 0); 951 /* 952 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 953 */ 954 if (nvp == fdvp) { 955 error = ENOTEMPTY; 956 goto releout; 957 } 958 goto relock; 959 } 960 } 961 tmpfs_rename_restarts += restarts; 962 963 return (0); 964 965releout: 966 vrele(fdvp); 967 vrele(*fvpp); 968 vrele(tdvp); 969 if (*tvpp != NULL) 970 vrele(*tvpp); 971 tmpfs_rename_restarts += restarts; 972 973 return (error); 974} 975 976static int 977tmpfs_rename(struct vop_rename_args *v) 978{ 979 struct vnode *fdvp = v->a_fdvp; 980 struct vnode *fvp = v->a_fvp; 981 struct componentname *fcnp = v->a_fcnp; 982 struct vnode *tdvp = v->a_tdvp; 983 struct vnode *tvp = v->a_tvp; 984 struct componentname *tcnp = v->a_tcnp; 985 struct mount *mp = NULL; 986 987 char *newname; 988 int error; 989 struct tmpfs_dirent *de; 990 struct tmpfs_mount *tmp; 991 struct tmpfs_node *fdnode; 992 struct tmpfs_node *fnode; 993 struct tmpfs_node *tnode; 994 struct tmpfs_node *tdnode; 995 996 MPASS(VOP_ISLOCKED(tdvp)); 997 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 998 MPASS(fcnp->cn_flags & HASBUF); 999 MPASS(tcnp->cn_flags & HASBUF); 1000 1001 /* Disallow cross-device renames. 1002 * XXX Why isn't this done by the caller? */ 1003 if (fvp->v_mount != tdvp->v_mount || 1004 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 1005 error = EXDEV; 1006 goto out; 1007 } 1008 1009 /* If source and target are the same file, there is nothing to do. */ 1010 if (fvp == tvp) { 1011 error = 0; 1012 goto out; 1013 } 1014 1015 /* If we need to move the directory between entries, lock the 1016 * source so that we can safely operate on it. */ 1017 if (fdvp != tdvp && fdvp != tvp) { 1018 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1019 mp = tdvp->v_mount; 1020 error = vfs_busy(mp, 0); 1021 if (error != 0) { 1022 mp = NULL; 1023 goto out; 1024 } 1025 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1026 fcnp, tcnp); 1027 if (error != 0) { 1028 vfs_unbusy(mp); 1029 return (error); 1030 } 1031 ASSERT_VOP_ELOCKED(fdvp, 1032 "tmpfs_rename: fdvp not locked"); 1033 ASSERT_VOP_ELOCKED(tdvp, 1034 "tmpfs_rename: tdvp not locked"); 1035 if (tvp != NULL) 1036 ASSERT_VOP_ELOCKED(tvp, 1037 "tmpfs_rename: tvp not locked"); 1038 if (fvp == tvp) { 1039 error = 0; 1040 goto out_locked; 1041 } 1042 } 1043 } 1044 1045 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1046 tdnode = VP_TO_TMPFS_DIR(tdvp); 1047 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1048 fdnode = VP_TO_TMPFS_DIR(fdvp); 1049 fnode = VP_TO_TMPFS_NODE(fvp); 1050 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1051 1052 /* Entry can disappear before we lock fdvp, 1053 * also avoid manipulating '.' and '..' entries. */ 1054 if (de == NULL) { 1055 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1056 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1057 error = EINVAL; 1058 else 1059 error = ENOENT; 1060 goto out_locked; 1061 } 1062 MPASS(de->td_node == fnode); 1063 1064 /* If re-naming a directory to another preexisting directory 1065 * ensure that the target directory is empty so that its 1066 * removal causes no side effects. 1067 * Kern_rename gurantees the destination to be a directory 1068 * if the source is one. */ 1069 if (tvp != NULL) { 1070 MPASS(tnode != NULL); 1071 1072 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1073 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1074 error = EPERM; 1075 goto out_locked; 1076 } 1077 1078 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1079 if (tnode->tn_size > 0) { 1080 error = ENOTEMPTY; 1081 goto out_locked; 1082 } 1083 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1084 error = ENOTDIR; 1085 goto out_locked; 1086 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1087 error = EISDIR; 1088 goto out_locked; 1089 } else { 1090 MPASS(fnode->tn_type != VDIR && 1091 tnode->tn_type != VDIR); 1092 } 1093 } 1094 1095 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1096 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1097 error = EPERM; 1098 goto out_locked; 1099 } 1100 1101 /* Ensure that we have enough memory to hold the new name, if it 1102 * has to be changed. */ 1103 if (fcnp->cn_namelen != tcnp->cn_namelen || 1104 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1105 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1106 } else 1107 newname = NULL; 1108 1109 /* If the node is being moved to another directory, we have to do 1110 * the move. */ 1111 if (fdnode != tdnode) { 1112 /* In case we are moving a directory, we have to adjust its 1113 * parent to point to the new parent. */ 1114 if (de->td_node->tn_type == VDIR) { 1115 struct tmpfs_node *n; 1116 1117 /* Ensure the target directory is not a child of the 1118 * directory being moved. Otherwise, we'd end up 1119 * with stale nodes. */ 1120 n = tdnode; 1121 /* TMPFS_LOCK garanties that no nodes are freed while 1122 * traversing the list. Nodes can only be marked as 1123 * removed: tn_parent == NULL. */ 1124 TMPFS_LOCK(tmp); 1125 TMPFS_NODE_LOCK(n); 1126 while (n != n->tn_dir.tn_parent) { 1127 struct tmpfs_node *parent; 1128 1129 if (n == fnode) { 1130 TMPFS_NODE_UNLOCK(n); 1131 TMPFS_UNLOCK(tmp); 1132 error = EINVAL; 1133 if (newname != NULL) 1134 free(newname, M_TMPFSNAME); 1135 goto out_locked; 1136 } 1137 parent = n->tn_dir.tn_parent; 1138 TMPFS_NODE_UNLOCK(n); 1139 if (parent == NULL) { 1140 n = NULL; 1141 break; 1142 } 1143 TMPFS_NODE_LOCK(parent); 1144 if (parent->tn_dir.tn_parent == NULL) { 1145 TMPFS_NODE_UNLOCK(parent); 1146 n = NULL; 1147 break; 1148 } 1149 n = parent; 1150 } 1151 TMPFS_UNLOCK(tmp); 1152 if (n == NULL) { 1153 error = EINVAL; 1154 if (newname != NULL) 1155 free(newname, M_TMPFSNAME); 1156 goto out_locked; 1157 } 1158 TMPFS_NODE_UNLOCK(n); 1159 1160 /* Adjust the parent pointer. */ 1161 TMPFS_VALIDATE_DIR(fnode); 1162 TMPFS_NODE_LOCK(de->td_node); 1163 de->td_node->tn_dir.tn_parent = tdnode; 1164 TMPFS_NODE_UNLOCK(de->td_node); 1165 1166 /* As a result of changing the target of the '..' 1167 * entry, the link count of the source and target 1168 * directories has to be adjusted. */ 1169 TMPFS_NODE_LOCK(tdnode); 1170 TMPFS_ASSERT_LOCKED(tdnode); 1171 tdnode->tn_links++; 1172 TMPFS_NODE_UNLOCK(tdnode); 1173 1174 TMPFS_NODE_LOCK(fdnode); 1175 TMPFS_ASSERT_LOCKED(fdnode); 1176 fdnode->tn_links--; 1177 TMPFS_NODE_UNLOCK(fdnode); 1178 } 1179 } 1180 1181 /* Do the move: just remove the entry from the source directory 1182 * and insert it into the target one. */ 1183 tmpfs_dir_detach(fdvp, de); 1184 1185 if (fcnp->cn_flags & DOWHITEOUT) 1186 tmpfs_dir_whiteout_add(fdvp, fcnp); 1187 if (tcnp->cn_flags & ISWHITEOUT) 1188 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1189 1190 /* If the name has changed, we need to make it effective by changing 1191 * it in the directory entry. */ 1192 if (newname != NULL) { 1193 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1194 1195 free(de->ud.td_name, M_TMPFSNAME); 1196 de->ud.td_name = newname; 1197 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1198 1199 fnode->tn_status |= TMPFS_NODE_CHANGED; 1200 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1201 } 1202 1203 /* If we are overwriting an entry, we have to remove the old one 1204 * from the target directory. */ 1205 if (tvp != NULL) { 1206 struct tmpfs_dirent *tde; 1207 1208 /* Remove the old entry from the target directory. */ 1209 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1210 tmpfs_dir_detach(tdvp, tde); 1211 1212 /* Free the directory entry we just deleted. Note that the 1213 * node referred by it will not be removed until the vnode is 1214 * really reclaimed. */ 1215 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1216 } 1217 1218 tmpfs_dir_attach(tdvp, de); 1219 1220 cache_purge(fvp); 1221 if (tvp != NULL) 1222 cache_purge(tvp); 1223 cache_purge_negative(tdvp); 1224 1225 error = 0; 1226 1227out_locked: 1228 if (fdvp != tdvp && fdvp != tvp) 1229 VOP_UNLOCK(fdvp, 0); 1230 1231out: 1232 /* Release target nodes. */ 1233 /* XXX: I don't understand when tdvp can be the same as tvp, but 1234 * other code takes care of this... */ 1235 if (tdvp == tvp) 1236 vrele(tdvp); 1237 else 1238 vput(tdvp); 1239 if (tvp != NULL) 1240 vput(tvp); 1241 1242 /* Release source nodes. */ 1243 vrele(fdvp); 1244 vrele(fvp); 1245 1246 if (mp != NULL) 1247 vfs_unbusy(mp); 1248 1249 return error; 1250} 1251 1252/* --------------------------------------------------------------------- */ 1253 1254static int 1255tmpfs_mkdir(struct vop_mkdir_args *v) 1256{ 1257 struct vnode *dvp = v->a_dvp; 1258 struct vnode **vpp = v->a_vpp; 1259 struct componentname *cnp = v->a_cnp; 1260 struct vattr *vap = v->a_vap; 1261 1262 MPASS(vap->va_type == VDIR); 1263 1264 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1265} 1266 1267/* --------------------------------------------------------------------- */ 1268 1269static int 1270tmpfs_rmdir(struct vop_rmdir_args *v) 1271{ 1272 struct vnode *dvp = v->a_dvp; 1273 struct vnode *vp = v->a_vp; 1274 1275 int error; 1276 struct tmpfs_dirent *de; 1277 struct tmpfs_mount *tmp; 1278 struct tmpfs_node *dnode; 1279 struct tmpfs_node *node; 1280 1281 MPASS(VOP_ISLOCKED(dvp)); 1282 MPASS(VOP_ISLOCKED(vp)); 1283 1284 tmp = VFS_TO_TMPFS(dvp->v_mount); 1285 dnode = VP_TO_TMPFS_DIR(dvp); 1286 node = VP_TO_TMPFS_DIR(vp); 1287 1288 /* Directories with more than two entries ('.' and '..') cannot be 1289 * removed. */ 1290 if (node->tn_size > 0) { 1291 error = ENOTEMPTY; 1292 goto out; 1293 } 1294 1295 if ((dnode->tn_flags & APPEND) 1296 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1297 error = EPERM; 1298 goto out; 1299 } 1300 1301 /* This invariant holds only if we are not trying to remove "..". 1302 * We checked for that above so this is safe now. */ 1303 MPASS(node->tn_dir.tn_parent == dnode); 1304 1305 /* Get the directory entry associated with node (vp). This was 1306 * filled by tmpfs_lookup while looking up the entry. */ 1307 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1308 MPASS(TMPFS_DIRENT_MATCHES(de, 1309 v->a_cnp->cn_nameptr, 1310 v->a_cnp->cn_namelen)); 1311 1312 /* Check flags to see if we are allowed to remove the directory. */ 1313 if (dnode->tn_flags & APPEND 1314 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1315 error = EPERM; 1316 goto out; 1317 } 1318 1319 1320 /* Detach the directory entry from the directory (dnode). */ 1321 tmpfs_dir_detach(dvp, de); 1322 if (v->a_cnp->cn_flags & DOWHITEOUT) 1323 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1324 1325 /* No vnode should be allocated for this entry from this point */ 1326 TMPFS_NODE_LOCK(node); 1327 TMPFS_ASSERT_ELOCKED(node); 1328 node->tn_links--; 1329 node->tn_dir.tn_parent = NULL; 1330 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1331 TMPFS_NODE_MODIFIED; 1332 1333 TMPFS_NODE_UNLOCK(node); 1334 1335 TMPFS_NODE_LOCK(dnode); 1336 TMPFS_ASSERT_ELOCKED(dnode); 1337 dnode->tn_links--; 1338 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1339 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1340 TMPFS_NODE_UNLOCK(dnode); 1341 1342 cache_purge(dvp); 1343 cache_purge(vp); 1344 1345 /* Free the directory entry we just deleted. Note that the node 1346 * referred by it will not be removed until the vnode is really 1347 * reclaimed. */ 1348 tmpfs_free_dirent(tmp, de); 1349 1350 /* Release the deleted vnode (will destroy the node, notify 1351 * interested parties and clean it from the cache). */ 1352 1353 dnode->tn_status |= TMPFS_NODE_CHANGED; 1354 tmpfs_update(dvp); 1355 1356 error = 0; 1357 1358out: 1359 return error; 1360} 1361 1362/* --------------------------------------------------------------------- */ 1363 1364static int 1365tmpfs_symlink(struct vop_symlink_args *v) 1366{ 1367 struct vnode *dvp = v->a_dvp; 1368 struct vnode **vpp = v->a_vpp; 1369 struct componentname *cnp = v->a_cnp; 1370 struct vattr *vap = v->a_vap; 1371 char *target = v->a_target; 1372 1373#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1374 MPASS(vap->va_type == VLNK); 1375#else 1376 vap->va_type = VLNK; 1377#endif 1378 1379 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1380} 1381 1382/* --------------------------------------------------------------------- */ 1383 1384static int 1385tmpfs_readdir(struct vop_readdir_args *v) 1386{ 1387 struct vnode *vp = v->a_vp; 1388 struct uio *uio = v->a_uio; 1389 int *eofflag = v->a_eofflag; 1390 u_long **cookies = v->a_cookies; 1391 int *ncookies = v->a_ncookies; 1392 1393 int error; 1394 ssize_t startresid; 1395 int cnt = 0; 1396 struct tmpfs_node *node; 1397 1398 /* This operation only makes sense on directory nodes. */ 1399 if (vp->v_type != VDIR) 1400 return ENOTDIR; 1401 1402 node = VP_TO_TMPFS_DIR(vp); 1403 1404 startresid = uio->uio_resid; 1405 1406 if (cookies != NULL && ncookies != NULL) { 1407 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1408 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1409 *ncookies = 0; 1410 } 1411 1412 if (cnt == 0) 1413 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1414 else 1415 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1416 1417 if (error == EJUSTRETURN) 1418 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1419 1420 if (error != 0 && cnt != 0) 1421 free(*cookies, M_TEMP); 1422 1423 if (eofflag != NULL) 1424 *eofflag = 1425 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1426 1427 return error; 1428} 1429 1430/* --------------------------------------------------------------------- */ 1431 1432static int 1433tmpfs_readlink(struct vop_readlink_args *v) 1434{ 1435 struct vnode *vp = v->a_vp; 1436 struct uio *uio = v->a_uio; 1437 1438 int error; 1439 struct tmpfs_node *node; 1440 1441 MPASS(uio->uio_offset == 0); 1442 MPASS(vp->v_type == VLNK); 1443 1444 node = VP_TO_TMPFS_NODE(vp); 1445 1446 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1447 uio); 1448 node->tn_status |= TMPFS_NODE_ACCESSED; 1449 1450 return error; 1451} 1452 1453/* --------------------------------------------------------------------- */ 1454 1455static int 1456tmpfs_inactive(struct vop_inactive_args *v) 1457{ 1458 struct vnode *vp = v->a_vp; 1459 1460 struct tmpfs_node *node; 1461 1462 node = VP_TO_TMPFS_NODE(vp); 1463 1464 if (node->tn_links == 0) 1465 vrecycle(vp); 1466 1467 return 0; 1468} 1469 1470/* --------------------------------------------------------------------- */ 1471 1472int 1473tmpfs_reclaim(struct vop_reclaim_args *v) 1474{ 1475 struct vnode *vp = v->a_vp; 1476 1477 struct tmpfs_mount *tmp; 1478 struct tmpfs_node *node; 1479 1480 node = VP_TO_TMPFS_NODE(vp); 1481 tmp = VFS_TO_TMPFS(vp->v_mount); 1482 1483 if (vp->v_type == VREG) 1484 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1485 else 1486 vnode_destroy_vobject(vp); 1487 vp->v_object = NULL; 1488 cache_purge(vp); 1489 1490 TMPFS_NODE_LOCK(node); 1491 TMPFS_ASSERT_ELOCKED(node); 1492 tmpfs_free_vp(vp); 1493 1494 /* If the node referenced by this vnode was deleted by the user, 1495 * we must free its associated data structures (now that the vnode 1496 * is being reclaimed). */ 1497 if (node->tn_links == 0 && 1498 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1499 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1500 TMPFS_NODE_UNLOCK(node); 1501 tmpfs_free_node(tmp, node); 1502 } else 1503 TMPFS_NODE_UNLOCK(node); 1504 1505 MPASS(vp->v_data == NULL); 1506 return 0; 1507} 1508 1509/* --------------------------------------------------------------------- */ 1510 1511static int 1512tmpfs_print(struct vop_print_args *v) 1513{ 1514 struct vnode *vp = v->a_vp; 1515 1516 struct tmpfs_node *node; 1517 1518 node = VP_TO_TMPFS_NODE(vp); 1519 1520 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1521 node, node->tn_flags, node->tn_links); 1522 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1523 node->tn_mode, node->tn_uid, node->tn_gid, 1524 (intmax_t)node->tn_size, node->tn_status); 1525 1526 if (vp->v_type == VFIFO) 1527 fifo_printinfo(vp); 1528 1529 printf("\n"); 1530 1531 return 0; 1532} 1533 1534/* --------------------------------------------------------------------- */ 1535 1536static int 1537tmpfs_pathconf(struct vop_pathconf_args *v) 1538{ 1539 int name = v->a_name; 1540 register_t *retval = v->a_retval; 1541 1542 int error; 1543 1544 error = 0; 1545 1546 switch (name) { 1547 case _PC_LINK_MAX: 1548 *retval = LINK_MAX; 1549 break; 1550 1551 case _PC_NAME_MAX: 1552 *retval = NAME_MAX; 1553 break; 1554 1555 case _PC_PATH_MAX: 1556 *retval = PATH_MAX; 1557 break; 1558 1559 case _PC_PIPE_BUF: 1560 *retval = PIPE_BUF; 1561 break; 1562 1563 case _PC_CHOWN_RESTRICTED: 1564 *retval = 1; 1565 break; 1566 1567 case _PC_NO_TRUNC: 1568 *retval = 1; 1569 break; 1570 1571 case _PC_SYNC_IO: 1572 *retval = 1; 1573 break; 1574 1575 case _PC_FILESIZEBITS: 1576 *retval = 0; /* XXX Don't know which value should I return. */ 1577 break; 1578 1579 default: 1580 error = EINVAL; 1581 } 1582 1583 return error; 1584} 1585 1586static int 1587tmpfs_vptofh(struct vop_vptofh_args *ap) 1588{ 1589 struct tmpfs_fid *tfhp; 1590 struct tmpfs_node *node; 1591 1592 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1593 node = VP_TO_TMPFS_NODE(ap->a_vp); 1594 1595 tfhp->tf_len = sizeof(struct tmpfs_fid); 1596 tfhp->tf_id = node->tn_id; 1597 tfhp->tf_gen = node->tn_gen; 1598 1599 return (0); 1600} 1601 1602static int 1603tmpfs_whiteout(struct vop_whiteout_args *ap) 1604{ 1605 struct vnode *dvp = ap->a_dvp; 1606 struct componentname *cnp = ap->a_cnp; 1607 struct tmpfs_dirent *de; 1608 1609 switch (ap->a_flags) { 1610 case LOOKUP: 1611 return (0); 1612 case CREATE: 1613 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1614 if (de != NULL) 1615 return (de->td_node == NULL ? 0 : EEXIST); 1616 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1617 case DELETE: 1618 tmpfs_dir_whiteout_remove(dvp, cnp); 1619 return (0); 1620 default: 1621 panic("tmpfs_whiteout: unknown op"); 1622 } 1623} 1624 1625/* --------------------------------------------------------------------- */ 1626 1627/* 1628 * vnode operations vector used for files stored in a tmpfs file system. 1629 */ 1630struct vop_vector tmpfs_vnodeop_entries = { 1631 .vop_default = &default_vnodeops, 1632 .vop_lookup = vfs_cache_lookup, 1633 .vop_cachedlookup = tmpfs_lookup, 1634 .vop_create = tmpfs_create, 1635 .vop_mknod = tmpfs_mknod, 1636 .vop_open = tmpfs_open, 1637 .vop_close = tmpfs_close, 1638 .vop_access = tmpfs_access, 1639 .vop_getattr = tmpfs_getattr, 1640 .vop_setattr = tmpfs_setattr, 1641 .vop_read = tmpfs_read, 1642 .vop_write = tmpfs_write, 1643 .vop_fsync = tmpfs_fsync, 1644 .vop_remove = tmpfs_remove, 1645 .vop_link = tmpfs_link, 1646 .vop_rename = tmpfs_rename, 1647 .vop_mkdir = tmpfs_mkdir, 1648 .vop_rmdir = tmpfs_rmdir, 1649 .vop_symlink = tmpfs_symlink, 1650 .vop_readdir = tmpfs_readdir, 1651 .vop_readlink = tmpfs_readlink, 1652 .vop_inactive = tmpfs_inactive, 1653 .vop_reclaim = tmpfs_reclaim, 1654 .vop_print = tmpfs_print, 1655 .vop_pathconf = tmpfs_pathconf, 1656 .vop_vptofh = tmpfs_vptofh, 1657 .vop_whiteout = tmpfs_whiteout, 1658 .vop_bmap = VOP_EOPNOTSUPP, 1659}; 1660 1661