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sys/fs/tmpfs/tmpfs_vnops.c
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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: releng/11.0/sys/fs/tmpfs/tmpfs_vnops.c 298806 2016-04-29 20:51:24Z pfg $"); 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/stat.h> 49 #include <sys/systm.h> 50 #include <sys/sysctl.h> 51 #include <sys/unistd.h> 52 #include <sys/vnode.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_param.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_page.h> 58 #include <vm/vm_pager.h> 59 60 #include <fs/tmpfs/tmpfs_vnops.h> 61 #include <fs/tmpfs/tmpfs.h> 62 63 SYSCTL_DECL(_vfs_tmpfs); 64 65 static volatile int tmpfs_rename_restarts; 66 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 68 "Times rename had to restart due to lock contention"); 69 70 static int 71 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 72 struct vnode **rvp) 73 { 74 75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 76 } 77 78 static int 79 tmpfs_lookup(struct vop_cachedlookup_args *v) 80 { 81 struct vnode *dvp = v->a_dvp; 82 struct vnode **vpp = v->a_vpp; 83 struct componentname *cnp = v->a_cnp; 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode; 86 int error; 87 88 dnode = VP_TO_TMPFS_DIR(dvp); 89 *vpp = NULLVP; 90 91 /* Check accessibility of requested node as a first step. */ 92 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 93 if (error != 0) 94 goto out; 95 96 /* We cannot be requesting the parent directory of the root node. */ 97 MPASS(IMPLIES(dnode->tn_type == VDIR && 98 dnode->tn_dir.tn_parent == dnode, 99 !(cnp->cn_flags & ISDOTDOT))); 100 101 TMPFS_ASSERT_LOCKED(dnode); 102 if (dnode->tn_dir.tn_parent == NULL) { 103 error = ENOENT; 104 goto out; 105 } 106 if (cnp->cn_flags & ISDOTDOT) { 107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 108 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp); 109 if (error != 0) 110 goto out; 111 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 112 VREF(dvp); 113 *vpp = dvp; 114 error = 0; 115 } else { 116 de = tmpfs_dir_lookup(dnode, NULL, cnp); 117 if (de != NULL && de->td_node == NULL) 118 cnp->cn_flags |= ISWHITEOUT; 119 if (de == NULL || de->td_node == NULL) { 120 /* The entry was not found in the directory. 121 * This is OK if we are creating or renaming an 122 * entry and are working on the last component of 123 * the path name. */ 124 if ((cnp->cn_flags & ISLASTCN) && 125 (cnp->cn_nameiop == CREATE || \ 126 cnp->cn_nameiop == RENAME || 127 (cnp->cn_nameiop == DELETE && 128 cnp->cn_flags & DOWHITEOUT && 129 cnp->cn_flags & ISWHITEOUT))) { 130 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 131 cnp->cn_thread); 132 if (error != 0) 133 goto out; 134 135 /* Keep the component name in the buffer for 136 * future uses. */ 137 cnp->cn_flags |= SAVENAME; 138 139 error = EJUSTRETURN; 140 } else 141 error = ENOENT; 142 } else { 143 struct tmpfs_node *tnode; 144 145 /* The entry was found, so get its associated 146 * tmpfs_node. */ 147 tnode = de->td_node; 148 149 /* If we are not at the last path component and 150 * found a non-directory or non-link entry (which 151 * may itself be pointing to a directory), raise 152 * an error. */ 153 if ((tnode->tn_type != VDIR && 154 tnode->tn_type != VLNK) && 155 !(cnp->cn_flags & ISLASTCN)) { 156 error = ENOTDIR; 157 goto out; 158 } 159 160 /* If we are deleting or renaming the entry, keep 161 * track of its tmpfs_dirent so that it can be 162 * easily deleted later. */ 163 if ((cnp->cn_flags & ISLASTCN) && 164 (cnp->cn_nameiop == DELETE || 165 cnp->cn_nameiop == RENAME)) { 166 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 167 cnp->cn_thread); 168 if (error != 0) 169 goto out; 170 171 /* Allocate a new vnode on the matching entry. */ 172 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 173 cnp->cn_lkflags, vpp); 174 if (error != 0) 175 goto out; 176 177 if ((dnode->tn_mode & S_ISTXT) && 178 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 179 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 180 error = EPERM; 181 vput(*vpp); 182 *vpp = NULL; 183 goto out; 184 } 185 cnp->cn_flags |= SAVENAME; 186 } else { 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp); 189 if (error != 0) 190 goto out; 191 } 192 } 193 } 194 195 /* Store the result of this lookup in the cache. Avoid this if the 196 * request was for creation, as it does not improve timings on 197 * emprical tests. */ 198 if ((cnp->cn_flags & MAKEENTRY) != 0) 199 cache_enter(dvp, *vpp, cnp); 200 201 out: 202 /* If there were no errors, *vpp cannot be null and it must be 203 * locked. */ 204 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 205 206 return error; 207 } 208 209 static int 210 tmpfs_create(struct vop_create_args *v) 211 { 212 struct vnode *dvp = v->a_dvp; 213 struct vnode **vpp = v->a_vpp; 214 struct componentname *cnp = v->a_cnp; 215 struct vattr *vap = v->a_vap; 216 int error; 217 218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 219 220 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 221 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 222 cache_enter(dvp, *vpp, cnp); 223 return (error); 224 } 225 226 static int 227 tmpfs_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 static int 242 tmpfs_open(struct vop_open_args *v) 243 { 244 struct vnode *vp = v->a_vp; 245 int mode = v->a_mode; 246 247 int error; 248 struct tmpfs_node *node; 249 250 MPASS(VOP_ISLOCKED(vp)); 251 252 node = VP_TO_TMPFS_NODE(vp); 253 254 /* The file is still active but all its names have been removed 255 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 256 * it is about to die. */ 257 if (node->tn_links < 1) 258 return (ENOENT); 259 260 /* If the file is marked append-only, deny write requests. */ 261 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 262 error = EPERM; 263 else { 264 error = 0; 265 /* For regular files, the call below is nop. */ 266 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 267 OBJ_DEAD) == 0, ("dead object")); 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273 } 274 275 static int 276 tmpfs_close(struct vop_close_args *v) 277 { 278 struct vnode *vp = v->a_vp; 279 280 /* Update node times. */ 281 tmpfs_update(vp); 282 283 return (0); 284 } 285 286 int 287 tmpfs_access(struct vop_access_args *v) 288 { 289 struct vnode *vp = v->a_vp; 290 accmode_t accmode = v->a_accmode; 291 struct ucred *cred = v->a_cred; 292 293 int error; 294 struct tmpfs_node *node; 295 296 MPASS(VOP_ISLOCKED(vp)); 297 298 node = VP_TO_TMPFS_NODE(vp); 299 300 switch (vp->v_type) { 301 case VDIR: 302 /* FALLTHROUGH */ 303 case VLNK: 304 /* FALLTHROUGH */ 305 case VREG: 306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 307 error = EROFS; 308 goto out; 309 } 310 break; 311 312 case VBLK: 313 /* FALLTHROUGH */ 314 case VCHR: 315 /* FALLTHROUGH */ 316 case VSOCK: 317 /* FALLTHROUGH */ 318 case VFIFO: 319 break; 320 321 default: 322 error = EINVAL; 323 goto out; 324 } 325 326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 327 error = EPERM; 328 goto out; 329 } 330 331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 332 node->tn_gid, accmode, cred, NULL); 333 334 out: 335 MPASS(VOP_ISLOCKED(vp)); 336 337 return error; 338 } 339 340 int 341 tmpfs_getattr(struct vop_getattr_args *v) 342 { 343 struct vnode *vp = v->a_vp; 344 struct vattr *vap = v->a_vap; 345 vm_object_t obj; 346 struct tmpfs_node *node; 347 348 node = VP_TO_TMPFS_NODE(vp); 349 350 tmpfs_update(vp); 351 352 vap->va_type = vp->v_type; 353 vap->va_mode = node->tn_mode; 354 vap->va_nlink = node->tn_links; 355 vap->va_uid = node->tn_uid; 356 vap->va_gid = node->tn_gid; 357 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 358 vap->va_fileid = node->tn_id; 359 vap->va_size = node->tn_size; 360 vap->va_blocksize = PAGE_SIZE; 361 vap->va_atime = node->tn_atime; 362 vap->va_mtime = node->tn_mtime; 363 vap->va_ctime = node->tn_ctime; 364 vap->va_birthtime = node->tn_birthtime; 365 vap->va_gen = node->tn_gen; 366 vap->va_flags = node->tn_flags; 367 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 368 node->tn_rdev : NODEV; 369 if (vp->v_type == VREG) { 370 obj = node->tn_reg.tn_aobj; 371 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 372 } else 373 vap->va_bytes = node->tn_size; 374 vap->va_filerev = 0; 375 376 return 0; 377 } 378 379 int 380 tmpfs_setattr(struct vop_setattr_args *v) 381 { 382 struct vnode *vp = v->a_vp; 383 struct vattr *vap = v->a_vap; 384 struct ucred *cred = v->a_cred; 385 struct thread *td = curthread; 386 387 int error; 388 389 MPASS(VOP_ISLOCKED(vp)); 390 391 error = 0; 392 393 /* Abort if any unsettable attribute is given. */ 394 if (vap->va_type != VNON || 395 vap->va_nlink != VNOVAL || 396 vap->va_fsid != VNOVAL || 397 vap->va_fileid != VNOVAL || 398 vap->va_blocksize != VNOVAL || 399 vap->va_gen != VNOVAL || 400 vap->va_rdev != VNOVAL || 401 vap->va_bytes != VNOVAL) 402 error = EINVAL; 403 404 if (error == 0 && (vap->va_flags != VNOVAL)) 405 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 406 407 if (error == 0 && (vap->va_size != VNOVAL)) 408 error = tmpfs_chsize(vp, vap->va_size, cred, td); 409 410 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 411 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 412 413 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 414 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 415 416 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 417 vap->va_atime.tv_nsec != VNOVAL) || 418 (vap->va_mtime.tv_sec != VNOVAL && 419 vap->va_mtime.tv_nsec != VNOVAL) || 420 (vap->va_birthtime.tv_sec != VNOVAL && 421 vap->va_birthtime.tv_nsec != VNOVAL))) 422 error = tmpfs_chtimes(vp, vap, cred, td); 423 424 /* Update the node times. We give preference to the error codes 425 * generated by this function rather than the ones that may arise 426 * from tmpfs_update. */ 427 tmpfs_update(vp); 428 429 MPASS(VOP_ISLOCKED(vp)); 430 431 return error; 432 } 433 434 static int 435 tmpfs_read(struct vop_read_args *v) 436 { 437 struct vnode *vp; 438 struct uio *uio; 439 struct tmpfs_node *node; 440 441 vp = v->a_vp; 442 if (vp->v_type != VREG) 443 return (EISDIR); 444 uio = v->a_uio; 445 if (uio->uio_offset < 0) 446 return (EINVAL); 447 node = VP_TO_TMPFS_NODE(vp); 448 node->tn_status |= TMPFS_NODE_ACCESSED; 449 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 450 } 451 452 static int 453 tmpfs_write(struct vop_write_args *v) 454 { 455 struct vnode *vp; 456 struct uio *uio; 457 struct tmpfs_node *node; 458 off_t oldsize; 459 int error, ioflag; 460 461 vp = v->a_vp; 462 uio = v->a_uio; 463 ioflag = v->a_ioflag; 464 error = 0; 465 node = VP_TO_TMPFS_NODE(vp); 466 oldsize = node->tn_size; 467 468 if (uio->uio_offset < 0 || vp->v_type != VREG) 469 return (EINVAL); 470 if (uio->uio_resid == 0) 471 return (0); 472 if (ioflag & IO_APPEND) 473 uio->uio_offset = node->tn_size; 474 if (uio->uio_offset + uio->uio_resid > 475 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 476 return (EFBIG); 477 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 478 return (EFBIG); 479 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 480 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 481 FALSE); 482 if (error != 0) 483 goto out; 484 } 485 486 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 487 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 488 TMPFS_NODE_CHANGED; 489 if (node->tn_mode & (S_ISUID | S_ISGID)) { 490 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 491 node->tn_mode &= ~(S_ISUID | S_ISGID); 492 } 493 if (error != 0) 494 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 495 496 out: 497 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 498 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 499 500 return (error); 501 } 502 503 static int 504 tmpfs_fsync(struct vop_fsync_args *v) 505 { 506 struct vnode *vp = v->a_vp; 507 508 MPASS(VOP_ISLOCKED(vp)); 509 510 tmpfs_check_mtime(vp); 511 tmpfs_update(vp); 512 513 return 0; 514 } 515 516 static int 517 tmpfs_remove(struct vop_remove_args *v) 518 { 519 struct vnode *dvp = v->a_dvp; 520 struct vnode *vp = v->a_vp; 521 522 int error; 523 struct tmpfs_dirent *de; 524 struct tmpfs_mount *tmp; 525 struct tmpfs_node *dnode; 526 struct tmpfs_node *node; 527 528 MPASS(VOP_ISLOCKED(dvp)); 529 MPASS(VOP_ISLOCKED(vp)); 530 531 if (vp->v_type == VDIR) { 532 error = EISDIR; 533 goto out; 534 } 535 536 dnode = VP_TO_TMPFS_DIR(dvp); 537 node = VP_TO_TMPFS_NODE(vp); 538 tmp = VFS_TO_TMPFS(vp->v_mount); 539 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 540 MPASS(de != NULL); 541 542 /* Files marked as immutable or append-only cannot be deleted. */ 543 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 544 (dnode->tn_flags & APPEND)) { 545 error = EPERM; 546 goto out; 547 } 548 549 /* Remove the entry from the directory; as it is a file, we do not 550 * have to change the number of hard links of the directory. */ 551 tmpfs_dir_detach(dvp, de); 552 if (v->a_cnp->cn_flags & DOWHITEOUT) 553 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 554 555 /* Free the directory entry we just deleted. Note that the node 556 * referred by it will not be removed until the vnode is really 557 * reclaimed. */ 558 tmpfs_free_dirent(tmp, de); 559 560 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 561 error = 0; 562 563 out: 564 565 return error; 566 } 567 568 static int 569 tmpfs_link(struct vop_link_args *v) 570 { 571 struct vnode *dvp = v->a_tdvp; 572 struct vnode *vp = v->a_vp; 573 struct componentname *cnp = v->a_cnp; 574 575 int error; 576 struct tmpfs_dirent *de; 577 struct tmpfs_node *node; 578 579 MPASS(VOP_ISLOCKED(dvp)); 580 MPASS(cnp->cn_flags & HASBUF); 581 MPASS(dvp != vp); /* XXX When can this be false? */ 582 node = VP_TO_TMPFS_NODE(vp); 583 584 /* Ensure that we do not overflow the maximum number of links imposed 585 * by the system. */ 586 MPASS(node->tn_links <= LINK_MAX); 587 if (node->tn_links == LINK_MAX) { 588 error = EMLINK; 589 goto out; 590 } 591 592 /* We cannot create links of files marked immutable or append-only. */ 593 if (node->tn_flags & (IMMUTABLE | APPEND)) { 594 error = EPERM; 595 goto out; 596 } 597 598 /* Allocate a new directory entry to represent the node. */ 599 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 600 cnp->cn_nameptr, cnp->cn_namelen, &de); 601 if (error != 0) 602 goto out; 603 604 /* Insert the new directory entry into the appropriate directory. */ 605 if (cnp->cn_flags & ISWHITEOUT) 606 tmpfs_dir_whiteout_remove(dvp, cnp); 607 tmpfs_dir_attach(dvp, de); 608 609 /* vp link count has changed, so update node times. */ 610 node->tn_status |= TMPFS_NODE_CHANGED; 611 tmpfs_update(vp); 612 613 error = 0; 614 615 out: 616 return error; 617 } 618 619 /* 620 * We acquire all but fdvp locks using non-blocking acquisitions. If we 621 * fail to acquire any lock in the path we will drop all held locks, 622 * acquire the new lock in a blocking fashion, and then release it and 623 * restart the rename. This acquire/release step ensures that we do not 624 * spin on a lock waiting for release. On error release all vnode locks 625 * and decrement references the way tmpfs_rename() would do. 626 */ 627 static int 628 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 629 struct vnode *tdvp, struct vnode **tvpp, 630 struct componentname *fcnp, struct componentname *tcnp) 631 { 632 struct vnode *nvp; 633 struct mount *mp; 634 struct tmpfs_dirent *de; 635 int error, restarts = 0; 636 637 VOP_UNLOCK(tdvp, 0); 638 if (*tvpp != NULL && *tvpp != tdvp) 639 VOP_UNLOCK(*tvpp, 0); 640 mp = fdvp->v_mount; 641 642 relock: 643 restarts += 1; 644 error = vn_lock(fdvp, LK_EXCLUSIVE); 645 if (error) 646 goto releout; 647 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 648 VOP_UNLOCK(fdvp, 0); 649 error = vn_lock(tdvp, LK_EXCLUSIVE); 650 if (error) 651 goto releout; 652 VOP_UNLOCK(tdvp, 0); 653 goto relock; 654 } 655 /* 656 * Re-resolve fvp to be certain it still exists and fetch the 657 * correct vnode. 658 */ 659 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 660 if (de == NULL) { 661 VOP_UNLOCK(fdvp, 0); 662 VOP_UNLOCK(tdvp, 0); 663 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 664 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 665 error = EINVAL; 666 else 667 error = ENOENT; 668 goto releout; 669 } 670 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 671 if (error != 0) { 672 VOP_UNLOCK(fdvp, 0); 673 VOP_UNLOCK(tdvp, 0); 674 if (error != EBUSY) 675 goto releout; 676 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 677 if (error != 0) 678 goto releout; 679 VOP_UNLOCK(nvp, 0); 680 /* 681 * Concurrent rename race. 682 */ 683 if (nvp == tdvp) { 684 vrele(nvp); 685 error = EINVAL; 686 goto releout; 687 } 688 vrele(*fvpp); 689 *fvpp = nvp; 690 goto relock; 691 } 692 vrele(*fvpp); 693 *fvpp = nvp; 694 VOP_UNLOCK(*fvpp, 0); 695 /* 696 * Re-resolve tvp and acquire the vnode lock if present. 697 */ 698 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 699 /* 700 * If tvp disappeared we just carry on. 701 */ 702 if (de == NULL && *tvpp != NULL) { 703 vrele(*tvpp); 704 *tvpp = NULL; 705 } 706 /* 707 * Get the tvp ino if the lookup succeeded. We may have to restart 708 * if the non-blocking acquire fails. 709 */ 710 if (de != NULL) { 711 nvp = NULL; 712 error = tmpfs_alloc_vp(mp, de->td_node, 713 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 714 if (*tvpp != NULL) 715 vrele(*tvpp); 716 *tvpp = nvp; 717 if (error != 0) { 718 VOP_UNLOCK(fdvp, 0); 719 VOP_UNLOCK(tdvp, 0); 720 if (error != EBUSY) 721 goto releout; 722 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 723 &nvp); 724 if (error != 0) 725 goto releout; 726 VOP_UNLOCK(nvp, 0); 727 /* 728 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 729 */ 730 if (nvp == fdvp) { 731 error = ENOTEMPTY; 732 goto releout; 733 } 734 goto relock; 735 } 736 } 737 tmpfs_rename_restarts += restarts; 738 739 return (0); 740 741 releout: 742 vrele(fdvp); 743 vrele(*fvpp); 744 vrele(tdvp); 745 if (*tvpp != NULL) 746 vrele(*tvpp); 747 tmpfs_rename_restarts += restarts; 748 749 return (error); 750 } 751 752 static int 753 tmpfs_rename(struct vop_rename_args *v) 754 { 755 struct vnode *fdvp = v->a_fdvp; 756 struct vnode *fvp = v->a_fvp; 757 struct componentname *fcnp = v->a_fcnp; 758 struct vnode *tdvp = v->a_tdvp; 759 struct vnode *tvp = v->a_tvp; 760 struct componentname *tcnp = v->a_tcnp; 761 struct mount *mp = NULL; 762 763 char *newname; 764 int error; 765 struct tmpfs_dirent *de; 766 struct tmpfs_mount *tmp; 767 struct tmpfs_node *fdnode; 768 struct tmpfs_node *fnode; 769 struct tmpfs_node *tnode; 770 struct tmpfs_node *tdnode; 771 772 MPASS(VOP_ISLOCKED(tdvp)); 773 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 774 MPASS(fcnp->cn_flags & HASBUF); 775 MPASS(tcnp->cn_flags & HASBUF); 776 777 /* Disallow cross-device renames. 778 * XXX Why isn't this done by the caller? */ 779 if (fvp->v_mount != tdvp->v_mount || 780 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 781 error = EXDEV; 782 goto out; 783 } 784 785 /* If source and target are the same file, there is nothing to do. */ 786 if (fvp == tvp) { 787 error = 0; 788 goto out; 789 } 790 791 /* If we need to move the directory between entries, lock the 792 * source so that we can safely operate on it. */ 793 if (fdvp != tdvp && fdvp != tvp) { 794 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 795 mp = tdvp->v_mount; 796 error = vfs_busy(mp, 0); 797 if (error != 0) { 798 mp = NULL; 799 goto out; 800 } 801 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 802 fcnp, tcnp); 803 if (error != 0) { 804 vfs_unbusy(mp); 805 return (error); 806 } 807 ASSERT_VOP_ELOCKED(fdvp, 808 "tmpfs_rename: fdvp not locked"); 809 ASSERT_VOP_ELOCKED(tdvp, 810 "tmpfs_rename: tdvp not locked"); 811 if (tvp != NULL) 812 ASSERT_VOP_ELOCKED(tvp, 813 "tmpfs_rename: tvp not locked"); 814 if (fvp == tvp) { 815 error = 0; 816 goto out_locked; 817 } 818 } 819 } 820 821 tmp = VFS_TO_TMPFS(tdvp->v_mount); 822 tdnode = VP_TO_TMPFS_DIR(tdvp); 823 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 824 fdnode = VP_TO_TMPFS_DIR(fdvp); 825 fnode = VP_TO_TMPFS_NODE(fvp); 826 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 827 828 /* Entry can disappear before we lock fdvp, 829 * also avoid manipulating '.' and '..' entries. */ 830 if (de == NULL) { 831 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 832 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 833 error = EINVAL; 834 else 835 error = ENOENT; 836 goto out_locked; 837 } 838 MPASS(de->td_node == fnode); 839 840 /* If re-naming a directory to another preexisting directory 841 * ensure that the target directory is empty so that its 842 * removal causes no side effects. 843 * Kern_rename guarantees the destination to be a directory 844 * if the source is one. */ 845 if (tvp != NULL) { 846 MPASS(tnode != NULL); 847 848 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 849 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 850 error = EPERM; 851 goto out_locked; 852 } 853 854 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 855 if (tnode->tn_size > 0) { 856 error = ENOTEMPTY; 857 goto out_locked; 858 } 859 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 860 error = ENOTDIR; 861 goto out_locked; 862 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 863 error = EISDIR; 864 goto out_locked; 865 } else { 866 MPASS(fnode->tn_type != VDIR && 867 tnode->tn_type != VDIR); 868 } 869 } 870 871 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 872 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 873 error = EPERM; 874 goto out_locked; 875 } 876 877 /* Ensure that we have enough memory to hold the new name, if it 878 * has to be changed. */ 879 if (fcnp->cn_namelen != tcnp->cn_namelen || 880 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 881 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 882 } else 883 newname = NULL; 884 885 /* If the node is being moved to another directory, we have to do 886 * the move. */ 887 if (fdnode != tdnode) { 888 /* In case we are moving a directory, we have to adjust its 889 * parent to point to the new parent. */ 890 if (de->td_node->tn_type == VDIR) { 891 struct tmpfs_node *n; 892 893 /* Ensure the target directory is not a child of the 894 * directory being moved. Otherwise, we'd end up 895 * with stale nodes. */ 896 n = tdnode; 897 /* TMPFS_LOCK garanties that no nodes are freed while 898 * traversing the list. Nodes can only be marked as 899 * removed: tn_parent == NULL. */ 900 TMPFS_LOCK(tmp); 901 TMPFS_NODE_LOCK(n); 902 while (n != n->tn_dir.tn_parent) { 903 struct tmpfs_node *parent; 904 905 if (n == fnode) { 906 TMPFS_NODE_UNLOCK(n); 907 TMPFS_UNLOCK(tmp); 908 error = EINVAL; 909 if (newname != NULL) 910 free(newname, M_TMPFSNAME); 911 goto out_locked; 912 } 913 parent = n->tn_dir.tn_parent; 914 TMPFS_NODE_UNLOCK(n); 915 if (parent == NULL) { 916 n = NULL; 917 break; 918 } 919 TMPFS_NODE_LOCK(parent); 920 if (parent->tn_dir.tn_parent == NULL) { 921 TMPFS_NODE_UNLOCK(parent); 922 n = NULL; 923 break; 924 } 925 n = parent; 926 } 927 TMPFS_UNLOCK(tmp); 928 if (n == NULL) { 929 error = EINVAL; 930 if (newname != NULL) 931 free(newname, M_TMPFSNAME); 932 goto out_locked; 933 } 934 TMPFS_NODE_UNLOCK(n); 935 936 /* Adjust the parent pointer. */ 937 TMPFS_VALIDATE_DIR(fnode); 938 TMPFS_NODE_LOCK(de->td_node); 939 de->td_node->tn_dir.tn_parent = tdnode; 940 TMPFS_NODE_UNLOCK(de->td_node); 941 942 /* As a result of changing the target of the '..' 943 * entry, the link count of the source and target 944 * directories has to be adjusted. */ 945 TMPFS_NODE_LOCK(tdnode); 946 TMPFS_ASSERT_LOCKED(tdnode); 947 tdnode->tn_links++; 948 TMPFS_NODE_UNLOCK(tdnode); 949 950 TMPFS_NODE_LOCK(fdnode); 951 TMPFS_ASSERT_LOCKED(fdnode); 952 fdnode->tn_links--; 953 TMPFS_NODE_UNLOCK(fdnode); 954 } 955 } 956 957 /* Do the move: just remove the entry from the source directory 958 * and insert it into the target one. */ 959 tmpfs_dir_detach(fdvp, de); 960 961 if (fcnp->cn_flags & DOWHITEOUT) 962 tmpfs_dir_whiteout_add(fdvp, fcnp); 963 if (tcnp->cn_flags & ISWHITEOUT) 964 tmpfs_dir_whiteout_remove(tdvp, tcnp); 965 966 /* If the name has changed, we need to make it effective by changing 967 * it in the directory entry. */ 968 if (newname != NULL) { 969 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 970 971 free(de->ud.td_name, M_TMPFSNAME); 972 de->ud.td_name = newname; 973 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 974 975 fnode->tn_status |= TMPFS_NODE_CHANGED; 976 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 977 } 978 979 /* If we are overwriting an entry, we have to remove the old one 980 * from the target directory. */ 981 if (tvp != NULL) { 982 struct tmpfs_dirent *tde; 983 984 /* Remove the old entry from the target directory. */ 985 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 986 tmpfs_dir_detach(tdvp, tde); 987 988 /* Free the directory entry we just deleted. Note that the 989 * node referred by it will not be removed until the vnode is 990 * really reclaimed. */ 991 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 992 } 993 994 tmpfs_dir_attach(tdvp, de); 995 996 cache_purge(fvp); 997 if (tvp != NULL) 998 cache_purge(tvp); 999 cache_purge_negative(tdvp); 1000 1001 error = 0; 1002 1003 out_locked: 1004 if (fdvp != tdvp && fdvp != tvp) 1005 VOP_UNLOCK(fdvp, 0); 1006 1007 out: 1008 /* Release target nodes. */ 1009 /* XXX: I don't understand when tdvp can be the same as tvp, but 1010 * other code takes care of this... */ 1011 if (tdvp == tvp) 1012 vrele(tdvp); 1013 else 1014 vput(tdvp); 1015 if (tvp != NULL) 1016 vput(tvp); 1017 1018 /* Release source nodes. */ 1019 vrele(fdvp); 1020 vrele(fvp); 1021 1022 if (mp != NULL) 1023 vfs_unbusy(mp); 1024 1025 return error; 1026 } 1027 1028 static int 1029 tmpfs_mkdir(struct vop_mkdir_args *v) 1030 { 1031 struct vnode *dvp = v->a_dvp; 1032 struct vnode **vpp = v->a_vpp; 1033 struct componentname *cnp = v->a_cnp; 1034 struct vattr *vap = v->a_vap; 1035 1036 MPASS(vap->va_type == VDIR); 1037 1038 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1039 } 1040 1041 static int 1042 tmpfs_rmdir(struct vop_rmdir_args *v) 1043 { 1044 struct vnode *dvp = v->a_dvp; 1045 struct vnode *vp = v->a_vp; 1046 1047 int error; 1048 struct tmpfs_dirent *de; 1049 struct tmpfs_mount *tmp; 1050 struct tmpfs_node *dnode; 1051 struct tmpfs_node *node; 1052 1053 MPASS(VOP_ISLOCKED(dvp)); 1054 MPASS(VOP_ISLOCKED(vp)); 1055 1056 tmp = VFS_TO_TMPFS(dvp->v_mount); 1057 dnode = VP_TO_TMPFS_DIR(dvp); 1058 node = VP_TO_TMPFS_DIR(vp); 1059 1060 /* Directories with more than two entries ('.' and '..') cannot be 1061 * removed. */ 1062 if (node->tn_size > 0) { 1063 error = ENOTEMPTY; 1064 goto out; 1065 } 1066 1067 if ((dnode->tn_flags & APPEND) 1068 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1069 error = EPERM; 1070 goto out; 1071 } 1072 1073 /* This invariant holds only if we are not trying to remove "..". 1074 * We checked for that above so this is safe now. */ 1075 MPASS(node->tn_dir.tn_parent == dnode); 1076 1077 /* Get the directory entry associated with node (vp). This was 1078 * filled by tmpfs_lookup while looking up the entry. */ 1079 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1080 MPASS(TMPFS_DIRENT_MATCHES(de, 1081 v->a_cnp->cn_nameptr, 1082 v->a_cnp->cn_namelen)); 1083 1084 /* Check flags to see if we are allowed to remove the directory. */ 1085 if (dnode->tn_flags & APPEND 1086 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1087 error = EPERM; 1088 goto out; 1089 } 1090 1091 1092 /* Detach the directory entry from the directory (dnode). */ 1093 tmpfs_dir_detach(dvp, de); 1094 if (v->a_cnp->cn_flags & DOWHITEOUT) 1095 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1096 1097 /* No vnode should be allocated for this entry from this point */ 1098 TMPFS_NODE_LOCK(node); 1099 TMPFS_ASSERT_ELOCKED(node); 1100 node->tn_links--; 1101 node->tn_dir.tn_parent = NULL; 1102 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1103 TMPFS_NODE_MODIFIED; 1104 1105 TMPFS_NODE_UNLOCK(node); 1106 1107 TMPFS_NODE_LOCK(dnode); 1108 TMPFS_ASSERT_ELOCKED(dnode); 1109 dnode->tn_links--; 1110 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1111 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1112 TMPFS_NODE_UNLOCK(dnode); 1113 1114 cache_purge(dvp); 1115 cache_purge(vp); 1116 1117 /* Free the directory entry we just deleted. Note that the node 1118 * referred by it will not be removed until the vnode is really 1119 * reclaimed. */ 1120 tmpfs_free_dirent(tmp, de); 1121 1122 /* Release the deleted vnode (will destroy the node, notify 1123 * interested parties and clean it from the cache). */ 1124 1125 dnode->tn_status |= TMPFS_NODE_CHANGED; 1126 tmpfs_update(dvp); 1127 1128 error = 0; 1129 1130 out: 1131 return error; 1132 } 1133 1134 static int 1135 tmpfs_symlink(struct vop_symlink_args *v) 1136 { 1137 struct vnode *dvp = v->a_dvp; 1138 struct vnode **vpp = v->a_vpp; 1139 struct componentname *cnp = v->a_cnp; 1140 struct vattr *vap = v->a_vap; 1141 char *target = v->a_target; 1142 1143 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1144 MPASS(vap->va_type == VLNK); 1145 #else 1146 vap->va_type = VLNK; 1147 #endif 1148 1149 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1150 } 1151 1152 static int 1153 tmpfs_readdir(struct vop_readdir_args *v) 1154 { 1155 struct vnode *vp = v->a_vp; 1156 struct uio *uio = v->a_uio; 1157 int *eofflag = v->a_eofflag; 1158 u_long **cookies = v->a_cookies; 1159 int *ncookies = v->a_ncookies; 1160 1161 int error; 1162 ssize_t startresid; 1163 int maxcookies; 1164 struct tmpfs_node *node; 1165 1166 /* This operation only makes sense on directory nodes. */ 1167 if (vp->v_type != VDIR) 1168 return ENOTDIR; 1169 1170 maxcookies = 0; 1171 node = VP_TO_TMPFS_DIR(vp); 1172 1173 startresid = uio->uio_resid; 1174 1175 /* Allocate cookies for NFS and compat modules. */ 1176 if (cookies != NULL && ncookies != NULL) { 1177 maxcookies = howmany(node->tn_size, 1178 sizeof(struct tmpfs_dirent)) + 2; 1179 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1180 M_WAITOK); 1181 *ncookies = 0; 1182 } 1183 1184 if (cookies == NULL) 1185 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1186 else 1187 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1188 ncookies); 1189 1190 /* Buffer was filled without hitting EOF. */ 1191 if (error == EJUSTRETURN) 1192 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1193 1194 if (error != 0 && cookies != NULL && ncookies != NULL) { 1195 free(*cookies, M_TEMP); 1196 *cookies = NULL; 1197 *ncookies = 0; 1198 } 1199 1200 if (eofflag != NULL) 1201 *eofflag = 1202 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1203 1204 return error; 1205 } 1206 1207 static int 1208 tmpfs_readlink(struct vop_readlink_args *v) 1209 { 1210 struct vnode *vp = v->a_vp; 1211 struct uio *uio = v->a_uio; 1212 1213 int error; 1214 struct tmpfs_node *node; 1215 1216 MPASS(uio->uio_offset == 0); 1217 MPASS(vp->v_type == VLNK); 1218 1219 node = VP_TO_TMPFS_NODE(vp); 1220 1221 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1222 uio); 1223 node->tn_status |= TMPFS_NODE_ACCESSED; 1224 1225 return error; 1226 } 1227 1228 static int 1229 tmpfs_inactive(struct vop_inactive_args *v) 1230 { 1231 struct vnode *vp; 1232 struct tmpfs_node *node; 1233 1234 vp = v->a_vp; 1235 node = VP_TO_TMPFS_NODE(vp); 1236 if (node->tn_links == 0) 1237 vrecycle(vp); 1238 else 1239 tmpfs_check_mtime(vp); 1240 return (0); 1241 } 1242 1243 int 1244 tmpfs_reclaim(struct vop_reclaim_args *v) 1245 { 1246 struct vnode *vp = v->a_vp; 1247 1248 struct tmpfs_mount *tmp; 1249 struct tmpfs_node *node; 1250 1251 node = VP_TO_TMPFS_NODE(vp); 1252 tmp = VFS_TO_TMPFS(vp->v_mount); 1253 1254 if (vp->v_type == VREG) 1255 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1256 else 1257 vnode_destroy_vobject(vp); 1258 vp->v_object = NULL; 1259 cache_purge(vp); 1260 1261 TMPFS_NODE_LOCK(node); 1262 TMPFS_ASSERT_ELOCKED(node); 1263 tmpfs_free_vp(vp); 1264 1265 /* If the node referenced by this vnode was deleted by the user, 1266 * we must free its associated data structures (now that the vnode 1267 * is being reclaimed). */ 1268 if (node->tn_links == 0 && 1269 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1270 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1271 TMPFS_NODE_UNLOCK(node); 1272 tmpfs_free_node(tmp, node); 1273 } else 1274 TMPFS_NODE_UNLOCK(node); 1275 1276 MPASS(vp->v_data == NULL); 1277 return 0; 1278 } 1279 1280 static int 1281 tmpfs_print(struct vop_print_args *v) 1282 { 1283 struct vnode *vp = v->a_vp; 1284 1285 struct tmpfs_node *node; 1286 1287 node = VP_TO_TMPFS_NODE(vp); 1288 1289 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1290 node, node->tn_flags, node->tn_links); 1291 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1292 node->tn_mode, node->tn_uid, node->tn_gid, 1293 (intmax_t)node->tn_size, node->tn_status); 1294 1295 if (vp->v_type == VFIFO) 1296 fifo_printinfo(vp); 1297 1298 printf("\n"); 1299 1300 return 0; 1301 } 1302 1303 static int 1304 tmpfs_pathconf(struct vop_pathconf_args *v) 1305 { 1306 int name = v->a_name; 1307 register_t *retval = v->a_retval; 1308 1309 int error; 1310 1311 error = 0; 1312 1313 switch (name) { 1314 case _PC_LINK_MAX: 1315 *retval = LINK_MAX; 1316 break; 1317 1318 case _PC_NAME_MAX: 1319 *retval = NAME_MAX; 1320 break; 1321 1322 case _PC_PATH_MAX: 1323 *retval = PATH_MAX; 1324 break; 1325 1326 case _PC_PIPE_BUF: 1327 *retval = PIPE_BUF; 1328 break; 1329 1330 case _PC_CHOWN_RESTRICTED: 1331 *retval = 1; 1332 break; 1333 1334 case _PC_NO_TRUNC: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_SYNC_IO: 1339 *retval = 1; 1340 break; 1341 1342 case _PC_FILESIZEBITS: 1343 *retval = 0; /* XXX Don't know which value should I return. */ 1344 break; 1345 1346 default: 1347 error = EINVAL; 1348 } 1349 1350 return error; 1351 } 1352 1353 static int 1354 tmpfs_vptofh(struct vop_vptofh_args *ap) 1355 { 1356 struct tmpfs_fid *tfhp; 1357 struct tmpfs_node *node; 1358 1359 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1360 node = VP_TO_TMPFS_NODE(ap->a_vp); 1361 1362 tfhp->tf_len = sizeof(struct tmpfs_fid); 1363 tfhp->tf_id = node->tn_id; 1364 tfhp->tf_gen = node->tn_gen; 1365 1366 return (0); 1367 } 1368 1369 static int 1370 tmpfs_whiteout(struct vop_whiteout_args *ap) 1371 { 1372 struct vnode *dvp = ap->a_dvp; 1373 struct componentname *cnp = ap->a_cnp; 1374 struct tmpfs_dirent *de; 1375 1376 switch (ap->a_flags) { 1377 case LOOKUP: 1378 return (0); 1379 case CREATE: 1380 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1381 if (de != NULL) 1382 return (de->td_node == NULL ? 0 : EEXIST); 1383 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1384 case DELETE: 1385 tmpfs_dir_whiteout_remove(dvp, cnp); 1386 return (0); 1387 default: 1388 panic("tmpfs_whiteout: unknown op"); 1389 } 1390 } 1391 1392 /* 1393 * vnode operations vector used for files stored in a tmpfs file system. 1394 */ 1395 struct vop_vector tmpfs_vnodeop_entries = { 1396 .vop_default = &default_vnodeops, 1397 .vop_lookup = vfs_cache_lookup, 1398 .vop_cachedlookup = tmpfs_lookup, 1399 .vop_create = tmpfs_create, 1400 .vop_mknod = tmpfs_mknod, 1401 .vop_open = tmpfs_open, 1402 .vop_close = tmpfs_close, 1403 .vop_access = tmpfs_access, 1404 .vop_getattr = tmpfs_getattr, 1405 .vop_setattr = tmpfs_setattr, 1406 .vop_read = tmpfs_read, 1407 .vop_write = tmpfs_write, 1408 .vop_fsync = tmpfs_fsync, 1409 .vop_remove = tmpfs_remove, 1410 .vop_link = tmpfs_link, 1411 .vop_rename = tmpfs_rename, 1412 .vop_mkdir = tmpfs_mkdir, 1413 .vop_rmdir = tmpfs_rmdir, 1414 .vop_symlink = tmpfs_symlink, 1415 .vop_readdir = tmpfs_readdir, 1416 .vop_readlink = tmpfs_readlink, 1417 .vop_inactive = tmpfs_inactive, 1418 .vop_reclaim = tmpfs_reclaim, 1419 .vop_print = tmpfs_print, 1420 .vop_pathconf = tmpfs_pathconf, 1421 .vop_vptofh = tmpfs_vptofh, 1422 .vop_whiteout = tmpfs_whiteout, 1423 .vop_bmap = VOP_EOPNOTSUPP, 1424 }; 1425
Cache object: 905bc0688b0560349a33e3ffba2147d8
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